Find Blockchain Projects with Vollna

We are seeking a skilled Solidity Developer to design, develop, and deploy smart contracts on blockchain platforms. You will have experience writing secure and efficient Solidity code and a strong understanding of blockchain architecture. Responsibilities include collaborating with cross-functional teams to implement decentralized applications and ensuring the security and integrity of smart contracts. You should have a solid background in blockchain development, including familiarity with tools such as Remix, Truffle, or Hardhat. Excellent problem-solving skills and attention to detail are essential to prevent vulnerabilities and optimize contract performance. Prior experience with auditing or security testing of smart contracts is a plus.

About the Opportunity

We are a forward-looking Web3 organization focused on developing high-impact onchain ecosystems. Our current roadmap includes the launch of a staking contract platform and an onchain gaming infrastructure, both seamlessly integrated with our Metaverse token ecosystem across leading EVM-compatible chains. To accelerate this vision, we are seeking a senior-level Blockchain Software Engineer with deep technical expertise in Solidity, smart contract architecture, and backend systems.
This is a remote, flexible engagement with a clear pathway to a long-term partnership, contingent upon demonstrated performance and mutual fit.


Core Responsibilities

- Architect, develop, and deploy secure and gas-optimized Solidity smart contracts for staking mechanisms and gaming platform utilities.
- Design and maintain backend infrastructure to support staking logic, token interactions, and platform-wide functionality.
- Collaborate closely with the engineering team to ensure seamless integration between onchain components and web-based frontend/backend systems.
- Provide bi-weekly progress reports to the Project Manager, ensuring transparency and alignment with project milestones.
- Conduct thorough code reviews, testing, and security audits to uphold best practices in blockchain development.


Required Qualifications

- Proven professional experience in Solidity development and smart contract deployment on EVM-compatible chains (Ethereum, Polygon, BSC, Arbitrum, etc.).
- Strong understanding of staking protocols, tokenomics, and DeFi primitives.
- Proficiency in full-stack web development (JavaScript/TypeScript, Node.js, React, or equivalent) to support dApp integration.
- Familiarity with version control systems (Git/GitHub) and CI/CD pipelines.
- Excellent communication skills, with the ability to articulate technical decisions and progress to both technical and non-technical stakeholders.
- Self-motivated, detail-oriented, and capable of working independently in a remote environment.


Compensation & Benefits

- Hourly Rate: $75 – $120/hour (commensurate with experience, location, and demonstrated expertise)
- Role Type: Remote – Full-time (30–40 hrs/week) or part-time, based on your preference and availability
- Trial Engagement: 1–2 weeks of paid onboarding at full rate to validate skills and collaboration fit
Long-Term Contract: Upon successful completion of the onboarding stage, we are pleased to discuss a long-term contract tailored to your contribution level
- Growth Potential: High-performing candidates will be considered for extended collaboration as we scale our platform and ecosystem

For context, well-funded protocols pay senior Solidity engineers $195K–$255K base salary plus token grants in full-time roles, translating to comparable freelance rates of $100–$150/hour for top-tier independent contractors . Complex DeFi or protocol-level builds typically run $30K–$150K+ per project.


Our Hiring Process

We have designed a structured, transparent, and merit-based evaluation process to ensure alignment with our technical standards and team culture:
1. Technical Skill Assessment – A practical GitHub-based task will be shared to evaluate your Solidity and backend engineering capabilities. Full instructions are provided in the accompanying README file.
2. Interview Rounds – Following the assessment, selected candidates will participate in 2–3 rounds of interviews, covering technical depth, architectural thinking, and cultural fit.
3. Paid Onboarding Stage – Shortlisted candidates will be invited to a 1–2 week paid trial engagement. This phase allows us to collaboratively validate your skills, working style, and integration into our development workflow.
4. Long-Term Engagement – Upon successful completion of the onboarding stage, we are pleased to discuss a long-term contract tailored to your availability and contribution level.


Application Instructions

- To apply, please submit your Upwork proposal including:
- A concise summary of your relevant experience, particularly with Solidity, staking protocols, and EVM-based projects.
- Links to your GitHub profile, relevant repositories, and/or deployed smart contracts (mainnet deployments with audit history are highly valued).
- Your availability (hours per week) and preferred working time zone.
- Upon review, shortlisted candidates will receive the skill assessment details and an invitation to schedule their first interview.

TRC-20 Flash USDT Developer Needed

I’m looking for an experienced TRON / TRC-20 Solidity developer to develop a custom Flash USDT TRC-20 project

The developer should have strong experience with:

TRC-20 smart contracts
Flash USDT / token simulation mechanics
TRON blockchain & wallet integration
Transaction and balance logic
Smart-contract testing and security
TronLink / Trust Wallet compatibility
DEX and liquidity integration

The project will require development, testing, deployment, source-code verification, and complete documentation.

If you have previous experience with Flash USDT TRC-20 projects, please send your portfolio, experience, estimated timeline, and price. ( Not Mandtory )

If you don’t fully understand the functionality I’m looking for, message me directly and I’ll explain the project in detail.

Skills: Java, Adobe Flash, ActionScript, Game Development, Blockchain, Solidity, Smart Contracts, TRON

We are seeking an expert blockchain engineer to develop a blockchain marketplace with AI integration. The project involves creating a platform for buying and selling AI models, ensuring secure and efficient transactions. The ideal candidate will have experience in blockchain technologies and AI systems, with a strong understanding of smart contracts and decentralized applications. The role requires collaboration with our team to design and implement the marketplace, ensuring scalability and user-friendly interfaces.

We are seeking a senior blockchain expert to integrate AI into our blockchain platform. The role involves developing smart contracts, implementing AI algorithms, and ensuring seamless interaction between blockchain and AI systems. The ideal candidate will have experience in blockchain development and AI integration, with a strong understanding of security and scalability.

I manage several Telegram channels focused on discovering and promoting cryptocurrency-based games and crypto gaming projects.

I’m looking for an experienced Telegram growth marketer who can help increase our subscriber base with real cryptocurrency users who are genuinely interested in gaming, blockchain projects, and new crypto-based platforms.

The objective is not simply to increase subscriber numbers. I want to build Telegram channels with an active, relevant audience that can later be used to promote crypto gaming projects.

What I’m Looking For

The ideal freelancer should be able to:

Attract real Telegram users from cryptocurrency, blockchain, Web3, and crypto gaming communities.
Use Telegram group-to-group promotion, cross-promotion, community partnerships, influencer/channel shout-outs, Discord communities, X/Twitter, crypto forums, or other relevant traffic sources.
Identify Telegram groups and communities where crypto users are already active.
Create and execute a practical subscriber acquisition campaign.
Test multiple traffic sources and determine which sources generate the highest-quality users.
Provide transparent and measurable results.

You may use your own promotional network, Telegram channels, crypto communities, social media accounts, or other legitimate acquisition methods.

Target Audience

We are specifically interested in:

Cryptocurrency users
Crypto traders and investors
Web3 users
Blockchain gaming communities
Online gaming and poker audiences familiar with crypto
Users interested in discovering new cryptocurrency-based games

Geographic targeting can be global.

Important: Real Users Only

We are not interested in bots, fake accounts, purchased inactive subscribers, or artificially inflated statistics.

The quality of the audience is more important than simply showing a large subscriber number.

We will evaluate performance based on factors such as:

Subscriber growth
Engagement
Post views
Audience activity
Traffic quality
Retention
Ability to generate interest in promoted crypto gaming projects
Deliverables
A short explanation of your Telegram growth strategy.
The traffic sources or communities you plan to use.
Execution of the subscriber acquisition campaign.
Regular reports showing subscriber growth and engagement.
A final report explaining which acquisition methods performed best.
When Applying

Please include:

Your experience growing Telegram communities.
Examples of Telegram or crypto-related projects you have worked on.
Approximate number of real targeted subscribers you believe you can generate.
Your proposed budget and timeframe.
The traffic sources you normally use.
Whether you already have access to crypto, blockchain, gaming, Telegram, Discord, or Web3 communities.

Freelancers who already operate crypto-related Telegram channels, Telegram groups, Discord communities, social media pages, or promotional networks are especially welcome.

This can become an ongoing project if the traffic quality and results are good.

The long-term goal is to build several strong Telegram communities that become reliable distribution channels for cryptocurrency-based gaming projects.

Skills: Social Media Marketing, Growth Hacking, Blockchain, Digital Marketing, Content Marketing, Telegram API, Cryptocurrency, Reddit Marketing

I have an existing meme coin trading bot that works in Solana and already handles token discovery, filtering and trade logic. I'm not looking to rebuild it — I need the execution layer improved.
Goal: a buy/sell execution module that completes a trade in under 1 second, measured from signal fired → transaction landed and confirmed on chain. Current average is around 3 seconds.
Scope:
* Rewrite/replace the current swap execution path (currently [Jupiter API / direct Raydium / pump.fun program calls — edit as applicable])
* Pre-warmed transaction construction: cached blockhashes, pre-derived ATAs, pre-signed or template transactions
* Jito bundle submission with tip strategy, plus fallback to direct RPC submission
* Multi-endpoint submission and race logic across dedicated RPCs
* Priority fee logic that adapts to network congestion
* Configurable slippage and retry/abort behaviour, plus a hard kill switch
* Latency instrumentation: per-stage timing logs (build / sign / submit / confirm) so results are verifiable
Stack: [Python / Rust / TypeScript — state what Arjuna is written in]. Must integrate with the existing codebase, not replace it.

Acceptance: 50 consecutive live trades on mainnet with logs showing p50 under 1s and p90 under 1-1.5s. Payment tied to this benchmark, not to a demo on devnet

Deliverables: source code, config documentation, and a short call walking me through the architecture.

To bid: tell me what your current best measured signal-to-confirmation latency is on Solana, and which RPC/bundler setup you achieved it with. Generic proposals will be ignored.

Skills: Python, Blockchain, Rust, API Development, Solana

I am looking for assistance with reviewing a drafted MSA and SOW. Both are made from a template and customized. I seek assistance with improving flow, accuracy, readability and mostly protection due to the risk associated with the prospects environment.

I'm looking for a reliable full-stack developer to take over an existing cryptocurrency project.

The app is already developed, but it currently has bugs and unfinished functionality that need to be properly investigated and fixed. I need someone who can not only make changes but also test and verify that each task is actually working before considering it completed.

Main responsibilities

- Debug and fix existing issues in the application
- Upload and deploy the app to Google Play
- Develop and integrate new features
- Test every fix and feature thoroughly before marking the task as complete
- Investigate and address other development issues that may arise during the project
- Maintain and improve the existing codebase
- Communicate clearly and consistently about progress, problems, and estimated completion times

Required technical skills

- PHP
- Laravel
- Node.js
- Flutter
- React
- Vue.js
- MySQL
- API development and integration
- WebSocket / real-time functionality
- Google Play deployment

I'm particularly interested in someone who is honest, reliable, responsive, and a good communicator. I don't want someone who simply says an issue is fixed without properly testing it.

Experience or a genuine interest in cryptocurrency, blockchain, and crypto wallets is also very important, as this is a cryptocurrency project.

I'm looking for someone who wants to understand the project and contribute to it long-term, rather than someone who simply completes isolated tasks without taking responsibility for the result.

Skills: PHP, JavaScript, MySQL, Node.js, Laravel, Vue.js, Flutter, API Development

We are looking for a Virtual Assistant to support the administrative side of a blockchain project.

Tasks may include organizing project information, maintaining spreadsheets, researching publicly available data, preparing reports, and assisting with routine project coordination.

Crypto or blockchain experience is preferred. Reliable communication and attention to detail are important.

I'm looking for a freelance developer with hands-on experience building Solana applications and Rust-based smart contracts.

The project involves blockchain development and requires someone who can work independently on the technical implementation.

Required experience:
- 1+ year of Rust smart contract development
- Practical experience with Solana and Anchor
- Understanding of Solana programs, accounts, PDAs, and transactions
- Experience developing and testing smart contracts
- Familiarity with TypeScript and JavaScript
- Experience with @solana/web3.js
- Strong debugging and problem-solving skills
- Comfortable using Git and working with an existing codebase

This is a freelance project with the potential for additional work depending on project requirements and performance.

Please include examples of relevant Solana or Rust work in your proposal, along with a brief description of your role in those projects.

I’m building a Polymarket-style, binary-outcome prediction market on Solana and I need a production-ready smart contract written in Rust with the Anchor framework. Everything must first ship to devnet for testing and, once accepted, deploy seamlessly to mainnet.

Core logic
• Users can create a market, deposit liquidity, trade shares, and—once an oracle pushes the final result—have winnings distributed automatically.
• Each action needs to emit precise events so my React/TypeScript frontend can stay perfectly in sync.

Creator incentives
Beyond the standard flow I want an incentive layer: market creators should earn a bonus that unlocks when their market crosses a predefined total transaction volume threshold. If you have ideas for complementary mechanisms (percent-based fees, fixed rewards, etc.) feel free to suggest them, but the bonus-for-volume model tied to total transaction volume is non-negotiable.

Quality bar
The contract must follow Solana security best practices, include deterministic unit and integration tests that cover state transitions, edge cases, and known attack vectors, and pass an external audit. Expect me to review program logs, anchor tests, and on-chain account data to confirm determinism.

Deliverables
1. Anchor program source with clear modules and comments
2. Full test suite (`cargo test` + Anchor tests) proving deterministic behaviour
3. Devnet deployment scripts and verified devnet address
4. Mainnet deploy script and hand-over guide
5. Audit report addressing all findings and fixes

If you live and breathe Solana, Rust, Anchor, and on-chain security, let’s talk timelines and your proposed architecture.

Skills: Java, Software Architecture, Software Testing, C++ Programming, Blockchain, Rust, Smart Contracts, Solana

Are you passionate about blockchain technology and building products that operate on decentralized networks?

Join our team as a Web3 Engineer and work across smart contracts, frontend applications, backend infrastructure, and blockchain integrations.

We’re looking for an experienced Google Ads Specialist with a strong background in the crypto/Web3 industry to help us build, manage, and optimize paid search campaigns.

Requirements:

Proven experience managing Google Ads campaigns
Experience with crypto, blockchain, or Web3-related businesses
Ability to build and manage campaigns from A–Z
Strong knowledge of keyword research, audience targeting, conversion tracking, and campaign optimization
Experience working with regulated or policy-sensitive industries
Strong understanding of Google Ads policies and compliance requirements
Ability to analyze performance data and continuously improve campaigns
Experience with account setup, campaign management, troubleshooting, and scaling

To Apply:
Please provide:

Your relevant Google Ads experience
Examples of crypto/Web3 campaigns you have managed
Your approach to building and optimizing campaigns
Your experience working within Google Ads policies

We’re looking for someone with demonstrable experience and a strong track record, not beginners.

We are seeking a skilled Solidity Developer to design, develop, and deploy smart contracts on blockchain platforms. You will have experience writing secure and efficient Solidity code and a strong understanding of blockchain architecture. Responsibilities include collaborating with cross-functional teams to implement decentralized applications and ensuring the security and integrity of smart contracts. You should have a solid background in blockchain development, including familiarity with tools such as Remix, Truffle, or Hardhat. Excellent problem-solving skills and attention to detail are essential to prevent vulnerabilities and optimize contract performance. Prior experience with auditing or security testing of smart contracts is a plus.

Blockchain Event — Messaging, Positioning, Media & PR Specialist

We are looking for an experienced Communications / PR / Media Relations freelancer to support the pre-event communications campaign for an upcoming blockchain/Web3 event in Malaysia.

The engagement is for approximately 1 month, leading up to the event.

We are looking for someone who can take ownership of the communications narrative and execute a targeted regional media and PR campaign — not simply create generic social media content or distribute a press release.

Scope of Work

1. Messaging & Positioning

We need support in developing the event's communications and messaging framework, including:

Core event value proposition
Event positioning and differentiation
Key talking points
Messaging pillars
Event tagline / campaign line
Tone of voice and recommended language
Announcement messaging
Email communications
Social media messaging
Speaker/partner announcement messaging
Registration and attendance messaging
Countdown campaign messaging

We also require the development of the content/copy for approximately 20 branded social media graphics, based on the event's existing brand guidelines.

The freelancer should be able to translate the overall event proposition into concise, compelling messaging suitable for different audiences and channels.

2. Pre-Event Media & PR

The second part of the project is focused on building awareness and securing pre-event media coverage.

Responsibilities include:

Develop a pre-event PR/media strategy
Identify relevant media across Malaysia and the wider region
Build a targeted media and journalist database
Identify relevant editorial angles
Develop press pitches
Draft or refine press release/announcement materials
Conduct direct journalist and editor outreach
Follow up with media contacts
Identify interview and speaker profiling opportunities
Pursue event listings and relevant editorial opportunities
Build relationships with relevant blockchain/Web3, fintech, technology and business media
Track media responses and coverage

3. Media Invitations & Accreditation

The freelancer will also support the operational side of media relations:

Develop media invitation messaging
Identify and invite relevant journalists
Manage media RSVPs
Coordinate media accreditation
Track confirmed media attendees
Follow up with invited journalists
Coordinate media information ahead of the event
Maintain an up-to-date media attendance list

Geographic Focus

The event will be held in Malaysia.

Primary media focus:

Malaysia
Singapore

Where relevant, we would also like to explore media opportunities across:

Indonesia
Thailand
Vietnam
Philippines
Wider Southeast Asia

Relevant media categories include:

Blockchain / Web3
Cryptocurrency
Fintech
Technology
Financial services
Business
Startups / VC
Mainstream business media
Industry/trade publications

1-Month Timeline

Week 1 — Strategy

Understand the event, audience and objectives
Messaging and positioning
Value proposition
Tagline
Key talking points
PR strategy
Media mapping

Week 2 — Preparation

Finalise messaging
Develop 20 graphic content/copy concepts
Develop press materials
Build media target list
Develop media pitches

Week 3 — Outreach

Launch media outreach
Journalist/editor pitching
Speaker/partner pitching
Media invitations
Follow-ups
Begin accreditation management

Week 4 — Conversion

Follow up with media
Secure pre-event coverage
Develop interview opportunities
Confirm media attendance
Complete accreditation
Final media coordination
Coverage/reporting

Who We Are Looking For

We are looking for someone with demonstrated experience in:

PR
Media relations
Corporate communications
Blockchain/Web3 communications
Fintech PR
Technology PR
Event PR
Journalist outreach

You should have existing media knowledge and ideally established journalist/editor relationships, particularly in Malaysia and/or Southeast Asia.

We are especially interested in someone who can demonstrate that they have personally secured editorial coverage, rather than relying primarily on paid media or press-release distribution platforms.

Please Include in Your Proposal

To help us assess the right freelancer, please provide:

1. Your relevant PR/media experience
2. Examples of blockchain, Web3, fintech or technology events you have supported
3. Examples of pre-event media coverage you have personally secured
4. Your media relationships/network across Malaysia and Southeast Asia
5. Your proposed approach for this one-month campaign
6. Your availability over the next month
7. Your proposed project fee
8. Examples of relevant work or campaigns

Please do not send a generic PR proposal. We are specifically looking for someone who can combine strategic messaging with hands-on regional media outreach and journalist relationship management.

We are looking for someone who can start quickly and take ownership of the campaign from strategy through to pre-event media engagement.

Skills: Public Relations, Communications, Blockchain

Looking for an experienced RWA and Web3 developer. Building a decentralized application for a real-world asset tokenization platform.

Current project is a working reference. Shows the expected features, user flows, and core business logic. Final app gets rebuilt from scratch. Cleaner architecture, better security, scalability, modern engineering practices.

We are looking for a person in USA who has an active account with Binance or Kraken or Bitstamp or OKX Exchange or other platforms and can reliably collect pricing data throughout the customer journey for cross-border stablecoin use cases.

This project focuses on collecting pricing information at each stage of the journey, including fiat deposit, fiat-to-stablecoin on-ramping, stablecoin conversion, on-chain and off-chain transfers, cross-chain routing where relevant, and fiat off-ramping at the receiving end. We want the data collection to reflect the actual customer experience of moving value internationally through the platform, including the rates, spreads, and fees shown at different points in the process.

Data will be gathered through online account journeys and, where relevant, any additional steps needed to document the full flow.

Main deliverable:
Data entered into our forms, with supporting screenshots.

Main requirements:
Currently live in USA
Have access to a verified account of any of the platforms mentioned
Comfortable documenting platform journeys involving fiat deposits, conversions, transfers, and withdrawals
Good English
Good computer skills
Responsive and adaptable to changing requirements

This job does not require any digital asset or fiat transactions.

We have multiple similar projects and are open to long-term collaboration.

Fixed-price contract.

**Ideal candidates will be based in Boston, United States of America**

About Us

Chainlabs is a Web3 data analytics and software boutique specializing in blockchain intelligence. Our mission is to enhance Web3 analytics, combat illicit activities, and foster transparency in the crypto ecosystem. We work with AML service providers, analytics firms, and law enforcement globally.

Role Overview

We are looking for a detail-oriented freelancer to work as a Cryptocurrency ATM Data Specialist based in the USA (Specifically Boston)

In this role, you will identify, research, and verify cryptocurrency ATMs in your local area, collecting accurate and verifiable data about their operation, ownership, and usage.

This work contributes to building structured datasets used in blockchain intelligence and compliance analysis.

Why Join Us?

- Contribute to meaningful work that improves blockchain transparency and supports safer crypto infrastructure.
- Build skills across regional market research, fintech analysis, and blockchain fundamentals.
- Learn from an experienced Web3 investigations team and grow in a high-trust, remote environment.

Key Responsibilities

- Identify cryptocurrency ATMs in your assigned city or region
- Collect and verify key information for each ATM, including:
- Exact location
- Operator / owning company
- Supported cryptocurrencies
- KYC requirements and user access levels
- Operational status (active, temporarily out of service, permanently closed)
- Conduct OSINT research to understand how each ATM operates
- Capture clear, high-quality photos of ATMs during visits
- Validate all collected data to ensure accuracy and consistency
- Submit structured data and collaborate with the team to maintain a reliable database

Requirements

- Basic experience using cryptocurrencies (e.g. BTC, ETH, LTC, etc.)
- Strong attention to detail and commitment to data accuracy
- Ability to work independently in a remote environment
- Good written and spoken English

What We Offer

- Flexible remote work (10–20 hrs/week, project-driven).
- Hourly compensation based on experience and output.
- Mentorship, training materials, and exposure to real Web3 investigations.
- Opportunity to grow into broader tracing/research responsibilities.

What Success Looks Like

- Complete an accurate ATM entries with minimal missing data
- Verified operator and operational details (no assumptions or guesswork)
- Clear, usable photos of each ATM
- Consistent data quality requiring minimal revisions during QC

Security & Compliance (Requirement)

- Follow Chainlabs’ security practices (2FA, VPN, secure handling of sources).
- Complete a brief identity verification before access to internal systems.
- Respect privacy and data-minimization guidelines when collecting/storing information.

We're looking for a Tech Lead / Blockchain Developer to help us build a decentralized education platform from scratch. This isn't just a quick project; you'd be owning the core pieces that make everything work: Web3 authentication, smart contract architecture, payment flows, download gating, and the metadata and search features that tie it all together.

We view this as a long‑term partnership. We need someone ready to take real ownership. That means driving architectural decisions, leading development efforts, and staying involved in QA through every stage of the product lifecycle. We want a collaborator who grows with us, not someone who drops in and out.

Since we're fully remote, we value self‑sufficiency, clear communication, and a proactive mindset. On the technical side, you'll need deep blockchain experience and a solid full‑stack background.

Above all, if you're genuinely excited about edtech and decentralized systems, and you're looking for a sustained commitment, we'd love to hear from you.

We are looking for an experienced Web3/Blockchain Engineer to help us build decentralized applications and smart contracts. You should have hands-on experience with Ethereum or other EVM-compatible chains, Solidity, and Web3 tools.

ABOUT VARIATIONAL

Variational is building a decentralized derivatives protocol for professional trading.

We've already built the initial protocol and an early version of Variational Pro. We're now moving into the next phase of development, where we're expanding the system, improving the architecture, and preparing the infrastructure for production.

We're looking for a Blockchain Tech Lead who can help us make the right technical decisions and turn them into working systems.

WHY THIS ROLE

You'll work directly with the founders and engineering team and have a meaningful influence on how the protocol is designed and built.

We want someone who can reason about the entire system, make practical architectural decisions, and get into the code when necessary.

You'll help answer questions around protocol design, on-chain vs. off-chain architecture, execution, risk, scalability, reliability, and how the different parts of the system should work together.

WHAT YOU'LL OWN

Protocol & Blockchain

- Smart contract and EVM architecture
- Core protocol design and integrations
- Transaction flows and blockchain infrastructure
- Execution and settlement systems
- Margin, collateral, liquidation, and risk

Backend & Distributed Systems

- Node.js and TypeScript services
- Go services and systems infrastructure
- APIs and WebSocket services
- Blockchain indexing and event processing
- Real-time and event-driven architectures
- PostgreSQL, Redis, and data infrastructure

Production Infrastructure

- Performance and scalability
- Reliability and observability
- Security and testing
- Docker, Kubernetes, and AWS
- eployment and production operations

VAR TOKEN

VAR is the native token of the Variational ecosystem.

You'll help shape the technical infrastructure around VAR across both on-chain and off-chain systems.

This includes token contracts and integrations, distribution and vesting, treasury infrastructure, and backend systems supporting the protocol's revenue-driven buyback-and-burn mechanism.

The goal is to build these systems as part of the broader protocol architecture rather than as isolated components.

WHO WE'RE LOOKING FOR

We're looking for an experienced engineer with strong technical judgment and a track record of building production systems.

Strong experience in several of these areas is expected:

- Solidity and EVM
- Node.js and TypeScript
- Go or Rust
- Blockchain / DeFi protocol engineering
- Distributed systems
- Smart contract security
- High-performance backend infrastructure
- Cloud infrastructure and production systems

Experience with derivatives, perpetuals, exchanges, trading systems, market infrastructure, or other financial systems is a strong plus.

HOW WE WORK

We're a small, highly technical team working directly with the founders.

You'll have a high degree of autonomy and will be expected to contribute both at the architecture level and in the implementation.

WHAT WE OFFER

- Significant influence over protocol architecture and technical direction
- Direct collaboration with the founders and core engineering team
- High ownership and autonomy
- Full-time, part-time, or consulting flexibility
- Competitive compensation

We're at a stage where the technical decisions we make now will shape the protocol for years.

If you want to help make those decisions and build the systems behind them, we'd love to talk.

I’m launching a USDT/USDC-funded payment card in the Philippines and need a growth partner who already runs active local communities. If you moderate or own sizeable groups on Telegram, Facebook, Discord—and ideally also X or Reddit—this will be a strong fit.

What matters to me is verifiable user acquisition, not vanity metrics. We will structure rewards around clear milestones: each completed KYC, card activation, first deposit, and first on-chain or POS transaction. I’m open to tiered bonuses or rev-share models so that your upside grows with conversion quality.

To move forward, tell me:
• Which communities you directly manage on Telegram, Facebook, Discord, X, or Reddit
• Estimated member counts and engagement levels
• Examples of past crypto, Web3, or fintech campaigns you’ve driven, including concrete results (sign-ups, volume, etc.)

Once we confirm fit, I’ll supply tracking links, unique promo codes, and creative assets. Let’s turn your audiences into real cardholders and share in the success.

Skills: Internet Marketing, Social Networking, Facebook Marketing, Social Media Marketing, Blockchain, Discord, Cryptocurrency, Community Management

We need a German-speaking professional to review a training script on crypto-assets for accuracy, clarity, and regulatory alignment. The work includes checking the content for language quality, ensuring it is suitable for a German-speaking audience, and confirming that it reflects current MiCA and ESMA requirements. You should be able to identify gaps, inconsistencies, or unclear sections and provide practical suggestions for improvement. This is a short-term project for someone who can deliver a clear, concise review with actionable feedback.

I’m developing a Web3 platform called Veritas that connects physical products with digital identity and ownership.

The idea is that every user has a digital avatar/identity represented by an NFT, linked to their wallet. Physical collectible products will also have their own NFT representing their digital certificate of authenticity and ownership.

Each physical product will have a unique NFC tag embedded into the garment. When someone taps the NFC with their phone, Veritas should identify that specific product and retrieve its digital certificate and blockchain information.

Users should be able to connect their wallet, view their avatar and collection, verify the authenticity of each collectible, see the current owner and ownership history, and eventually transfer or trade their assets with other users.

The architecture should have three main components:

1. Veritas Identity — the NFT/avatar representing the user.
2. Veritas Assets — NFTs representing the physical collectible products.
3. NFC Identity — a unique physical identifier connecting each product to its digital asset.

I want to start with a small MVP, not build the entire ecosystem at once. The first version should prove that we can create a user avatar, create a collectible with its NFT, link it to an NFC, verify it publicly, and transfer ownership between wallets.

I’m looking for a Full-Stack Web3/Blockchain developer with experience in Solidity, smart contracts, NFTs, wallets, databases, and Web3 applications. Experience with NFC and physical-product authentication would be a strong plus.

I’m not trying to build just another NFT collection. I want to build an infrastructure where people have a digital identity and the physical objects they own have verifiable digital identities connected to them.

Independent Verification of Two Blockchain Loyalty Prototypes (Short Engagement)
Overview
We're finalizing a developer selection for a short (3–4 week) build of a stablecoin-based consumer loyalty pilot, and we need an independent engineer to verify two candidate submissions before we award the contract. This is a review-and-report engagement only — you will not be building the pilot, and you must have no affiliation with either candidate.

Both candidates have submitted working demonstrations of the same core pipeline. One is a live demo running on a public EVM testnet with real on-chain transactions; the other is a browser-based prototype on simulated data that ships with its own self-verifying test harness. Your job is to independently confirm what each submission actually does, what is real versus simulated, and where the production risk sits — so our decision rests on your verification rather than the candidates' own claims.
Technical context
The intended production stack is: USDC on Base (EVM), a managed embedded wallet (Privy or Coinbase Embedded Wallets), Shopify orders/paid webhooks, server-side reward issuance, a mobile-web consumer surface, and Digital Ocean hosting. Familiarity with this stack is important for judging how far each demo is from launch-ready.
What you'll verify
Candidate A — live real-chain testnet demo. Clone the repo and run it end-to-end from the README with fresh credentials, then confirm:

On-chain reward issuance actually executes, and the reported transaction hashes resolve on the Base testnet block explorer.
Duplicate/replayed order webhooks are rejected idempotently (balance unchanged).
Cohort gating works (non-treatment users are rejected).
The issuance rate is runtime-configurable and takes effect on the next issuance.
Rewards are tracked in a double-entry / append-only ledger rather than a mutable balance field.

Candidate B — simulated prototype + self-verifying harness. Run the prototype and its harness independently (headless under Node/jsdom), not the candidate's own recorded pass, and confirm:

The SHA-256 of the loaded prototype bytes matches the delivered copy.
All assertions pass when the harness drives the real prototype (real clicks, nothing mocked).
Append-only ledger, ledger-derived balances (credits minus debits, no mutable balance field), idempotency + authenticated webhook handling, treasury conservation, OTP enforcement on withdraw, no-overdraw with re-auth, CSV export recomputes to match the on-screen values, pause/drain behavior, and input-injection handling all hold up.

Both candidates — production-readiness assessment. For each, flag the gap between what's demonstrated and what a real pilot needs: concurrency and persistence under load, key management (KMS), moving from simulated/testnet to a real USDC-on-Base + Shopify deployment, and anything a self-graded or single-author demo could be masking.
Deliverables
A short written report (per candidate) covering:

What you were able to reproduce independently, and how.
What is real, what is simulated, and what could not be verified.
A reproducibility rating and a plain-language risk assessment.
A brief (30-minute) call to walk us through your findings.
Required skills
Solidity / EVM smart contracts; experience with Base and USDC.
Node.js, headless testing (Node/jsdom), reading and running unfamiliar codebases from a README.
Embedded/managed wallets (Privy, Coinbase Embedded Wallets) and Shopify webhook integration.
Blockchain security or audit background; comfort distinguishing genuine on-chain behavior from simulation.
Engagement details
Fixed-scope review; estimated 8–15 hours.
Written report and findings call within 5 business days of receiving both submissions.
NDA required. You must confirm no prior or current relationship with either candidate.
Please include, in your proposal: relevant EVM/Base audit or verification work, and a one-line note on how you'd tell a real on-chain transfer from a simulated one.

I'm looking for an experienced Solidity Developer to help me build and maintain production-grade smart contracts and Web3 applications.

I'm looking for someone with strong hands-on experience in Solidity, EVM, smart-contract architecture, DeFi, and blockchain security. The role requires someone who can take ownership of technical tasks, write clean and secure code, and work independently.

Responsibilities
- Design, develop, and maintain Solidity smart contracts
- Build and integrate DeFi protocols, tokens, staking, DEX, or other Web3 functionality
- Work with OpenZeppelin, Foundry, and/or Hardhat
- Write comprehensive unit, integration, and security tests
- Review existing contracts and identify potential vulnerabilities
- Optimize contracts for gas efficiency, security, and maintainability
- Deploy and verify contracts across EVM-compatible networks
- Integrate smart contracts with backend services and Web3 frontends when required
- Debug and resolve issues during development, testing, and production

Requirements
- Strong professional experience with Solidity and EVM
- Solid understanding of smart-contract architecture and blockchain fundamentals
- Real experience building and deploying production smart contracts
- Strong knowledge of common smart-contract vulnerabilities and security best practices
- Experience with Foundry or Hardhat
- Good understanding of ERC-20, ERC-721/1155, DeFi protocols, and token mechanics
- Ability to read, review, test, and improve existing Solidity code
- Strong problem-solving skills and ability to work independently

Nice to Have
- Experience with DeFi, DEXs, lending, staking, vaults, or tokenization
- Experience with smart-contract audits and remediation of audit findings
- Experience with Ethers.js, Viem, TypeScript, or Node.js
- Experience with LayerZero or other cross-chain protocols
- Experience optimizing complex contracts for gas and security
- Contributions to open-source Web3 projects

This is a long-term remote opportunity. I'm looking for someone who can become a reliable technical contributor rather than someone interested only in short-term tasks.

When applying, please tell me about 2–3 Solidity projects you personally built, what you were responsible for, and whether the contracts are publicly available. Please also include your GitHub/portfolio, hourly rate, and availability.

I'm particularly interested in candidates with real production deployments and hands-on smart-contract experience, not just theoretical Solidity knowledge.

We are looking for an experienced Web3/Blockchain Engineer to help us build decentralized applications and smart contracts. You should have hands-on experience with Ethereum or other EVM-compatible chains, Solidity, and Web3 tools.

Hey Adeel!
I’m finalizing the roadmap for our non-custodial 1v1 competitive matchmaking protocol, and your background building ambassador programs on Zealy/Galxe and scaling Web3 communities is an exact fit for what we’re executing. 
We are securing our initial legal rules and compliance framework this week. Once that’s finalized, I want to give you full operational ownership over structuring our Discord onboarding, closed-beta waitlists, and gamified questlines. 
Our target is to build an active, highly engaged 20,000-member Discord hub over our 5-month testnet window leading up to our official mainnet launch. I want to make sure you have the exact resources and clarity needed to hit those numbers smoothly. 
Let’s touch base on how you’d like to structure the initial quest milestones so we can set up fixed Upwork escrows and get moving!

Looking for an experienced Rust Blockchain Developer to contribute to the development of production-grade blockchain infrastructure and Web3 systems.

The ideal candidate has strong hands-on experience with Rust, blockchain architecture, distributed systems, and on-chain infrastructure, with the ability to work independently and take ownership of complex technical tasks.

Responsibilities
- Develop and maintain blockchain infrastructure and protocol components using Rust
- Build high-performance blockchain services, APIs, and on-chain integrations
- Work with blockchain nodes, RPC, transactions, and on-chain data
- Optimize system performance, reliability, and resource usage
- Investigate and resolve production and synchronization issues
- Write unit, integration, and end-to-end tests
- Review and improve existing architecture, security, and code quality

Requirements
- Strong professional experience with Rust
- Solid understanding of blockchain architecture and distributed systems
- Hands-on experience building production blockchain or Web3 systems
- Good understanding of blockchain security and cryptographic concepts
- Experience with Git, testing, debugging, and production environments
- Strong problem-solving skills and ability to work independently
- Clear and professional communication

Nice to Have
- Experience with Solana, Substrate/Polkadot, Cosmos, or EVM
- Experience with blockchain nodes, indexers, explorers, or RPC infrastructure
- Smart-contract development experience
- Experience with PostgreSQL, Redis, Docker, Kubernetes, or cloud infrastructure
- Experience working on high-throughput or low-latency systems

This is intended as a long-term remote engagement, with the workload and hourly rate depending on experience and availability.

When applying, please briefly describe your Rust and blockchain experience, mention a few relevant projects you personally worked on, and include your GitHub/portfolio, hourly rate, and availability. Please focus on concrete production experience rather than general blockchain knowledge.

We are seeking a senior blockchain expert to integrate AI into our blockchain platform. The role involves developing smart contracts, implementing AI algorithms, and ensuring seamless interaction between blockchain and AI systems. The ideal candidate will have experience in blockchain development and AI integration, with a strong understanding of security and scalability.