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Building an AI Wellness Companion App — React Native Full MVP
I am building a fully designed AI-powered wellness companion mobile application for iOS and Android. This is not a concept — it is a complete, specified product ready for development. I am looking for an experienced React Native developer to build it from first line of code to App Store approval.
A complete 13-section product specification document covering every screen, every feature, every database table, and every API integration will be shared with shortlisted candidates. This description gives you enough to assess fit and propose accurately.

THE PRODUCT
An AI wellness companion app that combines calorie tracking, macro nutritional tracking, movement and gym tracking, photo food recognition, recipe generation, and subscription management — all unified through a named AI companion who communicates through natural conversation powered by the Gemini 3 Flash API.
The app launches simultaneously in four European countries with full multilingual support from day one: English, French, Dutch, and Spanish. i18n must be built from the first line of code. No hardcoded UI strings anywhere.
The core product experience is a conversational AI companion that feels like receiving a personal message from someone who genuinely knows the user — not a push notification from an app. This requires a specific UX implementation involving real-time timestamps and a typing indicator animation on every AI message. Full details in the specification document.

TECHNICAL STACK — ALL DECISIONS FINAL
Frontend: React Native — single codebase iOS and Android
Backend: Supabase — auth, database, edge functions, real-time, storage
AI model: Gemini 3 Flash by Google — not Claude, not GPT-4
Subscriptions: RevenueCat
Food database: Open Food Facts API — used for barcode scan and text search
Health data: Apple HealthKit + Google Fit — steps auto-sync
Internationalisation: i18next or react-i18next
Analytics: PostHog
Push notifications: Expo Notifications or Firebase — your recommendation
Camera / vision: Expo Camera + Gemini vision API
Deep linking: required on all push notifications and share functionality

APP ARCHITECTURE — OVERVIEW
Four bottom navigation tabs plus one central floating action button. The full UX specification, colour system, typography, and component behaviour are documented in the product brief. You are building to specification — not designing the product.
Tab 1 — AI Companion Chat
The primary tab. A conversational interface between the user and the AI companion. The companion sends proactive personalised messages multiple times per day — AI-generated from real-time user data, never templates. Each message triggers both a push notification and a new chat bubble with a typing indicator animation. Users can also send photos directly within the chat for food recognition and visual context.
Tab 2 — Today
Daily dashboard. Calorie ring, four macro progress bars (protein, fibre, carbohydrates, fat).
Steps section: auto-synced from HealthKit and Google Fit. Passive metric.Workout / gym section — separate from steps: three entry methods. (1) Automatic sync from connected devices — when a workout is completed on an Apple Watch, Fitbit, Garmin, Polar, Withings, or any device that writes to HealthKit or Google Fit, the app reads the workout data automatically (type, duration, calories burned) without requiring manual entry. (2) Manual logging via the + button. (3) Conversational logging via the AI companion. For devices not integrated with HealthKit or Google Fit.
A food log divided into Breakfast, Lunch, Dinner, and Snacks. Milestone celebrations triggered by specific user achievements — each visually distinct.
Tab 3 — Progress
Weight trend chart, weekly calorie average chart, logging streak calendar with a custom-designed streak icon (not a flame), and a share button generating a branded image card for social sharing.
Tab 4 — Profile
User plan settings, unit preference (metric or imperial — applies globally), AI companion settings, a saved recipe library, weight logging, subscription management, GDPR data controls, and a help and support section.
Central FAB — Food Logging
Always visible. Opens a choice screen with four equal logging methods: barcode scan, text search, photo recognition via Gemini vision API, and conversational logging via natural language. All four methods include a meal type selector and support both weight-based and fraction-based portion input.

KEY FEATURES — SUMMARY
Conversational food and workout logging: users tell the AI what they ate or what exercise they did in plain language. The AI extracts the relevant data, confirms with the user, and logs to Supabase automatically. Implemented via system prompt — no additional API cost.
Photo food recognition: user photographs a meal, Gemini vision API estimates nutritional content, AI presents the estimate conversationally for confirmation before logging.
Recipe generation: AI generates personalised recipes in conversation. Recipes are saved to a library (by tap or by voice instruction) and can be auto-logged to the food diary with one tap. Serving size adjustable before logging.
Proprietary personalisation architecture: user data captured at onboarding is stored permanently and injected into every AI system prompt for the lifetime of the account, creating a companion experience that deepens over time. Full architecture documented in the product brief.
Automatic workout sync from connected devices (Apple Watch, Fitbit, Garmin, Polar, Withings, and any device writing to HealthKit or Google Fit) in addition to manual and conversational logging.
Automatic steps sync from the device
Proactive AI messaging: multiple personalised messages per day, AI-generated from real-time user data. Morning message, evening dinner helper , streak alert (AI-generated in the companion's voice — not static text), weekly weigh-in reminder, and milestone celebrations. Timing adapts to observed user behaviour patterns. All notifications deep-link to the correct screen.
Offline capability: basic food logging must work offline with local data sync. Please propose your approach.
Help and support: in-app FAQ, report a problem form (submits to Supabase and sends email notification), and contact link — all in the Profile tab.

ONBOARDING
Before the AI conversation begins, the user completes a GDPR-compliant consent screen with three separate checkboxes: Terms and Conditions (mandatory), Privacy Policy (mandatory), and marketing communications (optional, pre-unchecked). All consent values stored with timestamp and IP.
The AI companion then conducts a five-question onboarding conversation. Questions cover basic metrics, goal setting, activity levels, past struggle patterns (multi-select — stored permanently for personalisation), and check-in preference. The unit preference (metric or imperial) is established at the very first question and applies globally throughout the app. The AI's first message after onboarding is generated by Gemini using the user's onboarding data — not hardcoded.

AI INTEGRATION — GEMINI 3 FLASH
Every API call constructs a dynamic system prompt injecting approximately 20 fields of real-time user data including current macros, calories, steps, workout data, streak, goals, and a permanently stored personalisation array from onboarding. I will provide the complete system prompt text. Your job is to build the API call structure that correctly injects this data on every single request.
Language detection is handled via a single system prompt instruction — Gemini responds natively in EN, FR, NL, or ES based on the language the user writes in. No separate translation layer required for conversation content.
If the Gemini API is unavailable when a proactive message is scheduled, a fallback warm message from a local pre-written library must be sent. The Leo chat tab must never show an error screen.

DATABASE — SUPABASE
Nine tables: users, food_logs, weight_logs, workout_logs, conversations, saved_recipes, activity_logs, consents, support_tickets. Full schema with all fields documented in the product brief. The conversations table stores every message permanently and is the primary long-term data asset of the product — never delete or truncate.

SUBSCRIPTION MODEL — REVENUECAT
14-day free trial with full access. 3-day grace period after trial with limited AI messages. After grace period: full lockout of both the AI chat and food logging. Users can view historical data but cannot add new entries. Two paid plans managed by RevenueCat. Annual plan must be pre-selected at the paywall. Approximately 250 free premium accounts for beta testers and partners via RevenueCat entitlement grants.

INTERNATIONALISATION
Complete English translation file (en.json) required as part of Milestone 1 delivery. Must be kept up to date throughout development. I return the French, Dutch, and Spanish files within one week of receiving each updated English file. No UI string may be hardcoded that is not also in en.json.

GDPR COMPLIANCE
Mandatory for Belgium, Netherlands, France, and Spain. Explicit consent with separate checkboxes at registration, right to data export (JSON), right to erasure (hard delete within 30 days), privacy policy always accessible, health data requires explicit consent. Please verify current requirements for all four countries at implementation time.

ANALYTICS
PostHog free tier. Required instrumented events include: onboarding completion, first food logged, first AI message, trial start, paywall seen, subscription purchased, streak milestones, feature usage events, and D1/D7/D30 retention.

BUDGET AND MILESTONES
Total fixed price: $8,500 for the complete MVP. Payment is milestone-based across four milestones. Final payment only after confirmed approval from both Apple App Store and Google Play Store. Full milestone breakdown in the product brief.
Timeline: 15 weeks to App Store submission.
Optional additional items — quote separately:
Landing page at meetleo.app: single-page website with multilingual support (/fr /nl /es), download CTA, and waitlist. Budget €300-500.
Post-launch support retainer: 3-month bug fix and maintenance. Please quote a monthly rate for 10-15 hours/month.

WORKING WITH ME
I am a non-technical founder based in Belgium. I am engaged, available, and review work carefully at each milestone. I expect one brief async written update per week covering what was completed, what is next, and any blockers. Milestone reviews happen via video call. If something is unclear or you hit a technical constraint, flag it immediately — I prefer knowing early over discovering late. All decisions affecting scope or architecture should be discussed and confirmed in writing before implementation.

WHAT I NEED IN YOUR PROPOSAL
I will only consider proposals that include all of the following. Generic proposals will be declined immediately.

Your hourly rate and total cost estimate.
Two or three published React Native apps with App Store or Google Play links.
Your specific experience with Supabase in a production consumer app.
Your experience integrating LLM APIs — Gemini, OpenAI, or similar — into a production app.
Your experience with RevenueCat or equivalent subscription management.
Your approach to i18n in React Native and how you ensure all strings are externalised.
Your experience with Apple HealthKit and Google Fit integration.
Your approach to offline food logging capability.
Confirmation you can implement a typing indicator animation and real-time timestamp on AI messages.
Confirmation you can implement a dynamic Gemini system prompt with permanently stored user data injected on every API call.
Your approach to Gemini API error handling and fallback.
One specific question or observation about this posting proving you have read it. Mandatory — proposals without this are declined.
Your availability and whether 15 weeks is achievable.
Your preferred communication rhythm.
Separate quote for the optional landing page and post-launch support retainer.

I am looking for a developer I can build with long-term. A v2 roadmap exists with additional features once the MVP is live. I am not looking for the cheapest option. I am looking for the right person who has done this before, takes pride in their work, and wants to build something genuinely good.

• Have you previously integrated an LLM API (Gemini, OpenAI, or similar) into a production mobile app? If yes, describe what you built and how you handled the dynamic prompt construction.
• Have you built and published a React Native app with RevenueCat subscription management and an Apple App Store approval? Please share the app name or link.
• This project requires building in four languages (EN/FR/NL/ES) from day one using i18next. Describe your approach to ensuring no UI strings are hardcoded and how you would structure the translation file delivery process with a non-technical client
• Describe your recent experience with similar projects
• Include a link to your GitHub profile and/or website

We’re looking for a senior App Growth Expert with deep experience in both App Store Optimization (ASO) and App Campaign management at scale to help drive our app into the Top 10 rankings.



Current rankings are:
- iOS Overall Free: 99
- iOS Overall Gross: 29

- Android Business Free: 146
- Android Overall Gross: 34

This is a strategic and execution-focused role for someone who has successfully grown consumer apps, understands both organic and paid growth loops, and can help us scale aggressively through a mix of ASO, paid acquisition, experimentation, and app growth strategy.



Scope of Work


- App Store Optimization (ASO)

Audit and optimize current ASO strategy (metadata, keywords, creatives, conversion optimization)

- Improve ranking visibility and organic acquisition

- Develop and execute ASO testing roadmap (icons, screenshots, video, copy, localization)

- Support category ranking growth with a clear path toward Top 10
- Identify growth levers through competitor and market analysis



2. App Campaigns Management & Scaling
- (Google / Apple preferred)

Optimize existing app acquisition campaigns

- Build and scale App Campaign strategies focused on efficient growth and ranking impact

- Improve campaign structure, bidding, audience signals, creative inputs and measurement

- Help define scaling strategy to support aggressive install and engagement growth

- Advise on growth loops between paid acquisition, retention and ranking momentum



3. Strategic App Growth Consulting


-Help define roadmap and milestones required to reach Top 50 app positioning

-Identify experiments and growth opportunities across acquisition, conversion and retention

-Bring senior recommendations based on prior scaling experience

-Act as a strategic partner, not just an executor



What We’re Looking For:


-Strong proven experience scaling consumer apps through ASO + paid app growth

-Deep expertise in Google App Campaigns / Apple Search Ads (Meta/TikTok a plus)

-Demonstrated track record helping apps improve rankings or reach category leadership

-Strong analytical and growth mindset, with experimentation experience

-Experience working against ambitious growth milestones

-Ability to operate strategically and hands-on



Engagement:


-Freelance / consulting engagement with potential ongoing collaboration

-Hourly rate to be negotiated based on experience

-We expect to work with defined milestones and deliverables, tied to growth objectives


We’re looking for someone senior, pragmatic and ambitious who can help us build a credible path toward becoming a Top 10 app.

If you have done this before or helped apps get close, we’d love to hear from you.

Spanish language is a plus.

We're looking for 15 individual Android app testers to help us validate our first-launch experience. The task is simple and takes about 5 minutes.

What you'll do:
1. Install our Android app from the Google Play Store (link shared after hire).
2. Open the app on a real Android device.
3. Go through the first-launch flow naturally until you reach the main/home screen.
4. Screen-record the entire session, from the moment you tap the app icon until you reach the main screen, using Android's built-in screen recorder.
5. Send us:
• The screen recording (one continuous, unedited take, MP4).
• A short note with: your country, Android device model, Android OS version, app version installed.

Payment: The price shown on this job posting is the full project budget for this task.

We're hiring 15 testers total. 3 from each of these countries:
- United States
- Philippines
- Mexico
- Canada
- Australia

Requirements:
- You must be physically located in one of the 5 countries listed above. Your Upwork profile country must match.
- Real Android device only. No emulators, no rooted devices.
- Android 10 or newer.
- Your Google Play account region must match your country (no VPN, no region switching).
- Recording must be a single continuous, unedited take.
- One recording per tester. No duplicates.

Timeline: Please submit within 3 days of being hired.

To apply, please tell us in 1-2 lines:
- Which country you're in.
- Your Android device model + Android version.

We will review proposals on a rolling basis and hire 3 testers per country (first qualified applicants per country are prioritized).

We are looking for a mobile developer to support the review and continuation of an app currently in development.

The project already has defined screens and initial structure, and the goal is to evaluate the current state, identify what can be reused, and help move the product forward toward a functional MVP.

This is a service-based marketplace app with two user roles (clients and service providers), involving authentication, scheduling flows, and basic data management.

Requirements:

* Strong experience with mobile app development (React Native, Flutter or similar)
* Experience working with backend services (preferably Firebase or equivalent)
* Ability to review and understand existing codebases
* Clean and organized coding practices
* Ability to work with defined UI/UX (Figma or similar)
* Portuguese is required (written and spoken)

Nice to have:

* Experience with marketplace or booking platforms
* Familiarity with real-time data or scheduling systems
* Experience preparing apps for production (App Store / Google Play)

Scope of work:

* Review current implementation (code and/or structure)
* Identify gaps and risks
* Suggest technical direction
* Continue development toward MVP

Important:

* Work must be done in our repository and infrastructure
* Clear communication and regular updates are expected
* Deliverables should follow agreed milestones

Please include in your proposal:

1. Your experience with similar projects
2. Your preferred tech stack for this type of app
3. Examples of apps you have worked on
4. Your availability (weekly)

We are looking for someone reliable and practical, who can help us move forward with clarity and speed.

British English (UK) Sentence Recording Project (500 to 600 sentences)

We are finding native British English (UK) to take part in a simple voice recording project using the Funcrowd mobile app.

What We Need:
- Record 500 to 600 sentences by using the Funcrowd mobile app.
- Quiet environment is most important,and a smartphone with good audio quality. An iPhone or a newer Android phone is preferred.

What We Offer:
- $30 USD for completing the task.
- Bonus: Receive a 5-star rating for completed work.
- We are accepting 200+ participants, so feel free to refer friends and family.

Note:
- You must be a native speaker of British English (UK).
- You can only participate once in this project. If you have already completed the same project with another client, please do not apply.
- If you have already completed this same 500 to 600 sentence task this month, you will not be eligible again for this task .

If you are interested and meet the criteria, we would love to have you join.

• Did you born and raise in UK?
• Have you recorded 500 to 600 sentences before via funcrowd app?

We are building a marketplace platform (similar to Fresha.de) and are looking for a reliable Fullstack Developer with strong backend understanding.

This is not a short-term task – we are looking for someone who can grow with the project and take ownership over time.

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🔧 Required Skills

- TypeScript (very important)
- API Design & Backend Architecture
- Experience with authentication (JWT or Firebase Auth)
- Database experience (PostgreSQL or SQL in general)
- Hosting & deployment experience (Vercel, Firebase or AWS)
- Experience with domain setup & SSL

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📱 Mobile / Frontend (important but secondary)

- Ionic
- Ionic + Capacitor (builds for iOS/Android)
- Basic UI/UX understanding (not design, but structure & logic)

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💰 Bonus (big plus)

- Experience with payment systems (Stripe or similar)
- Experience with Firebase

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🧠 What we expect

- Minimum 3–4 years of real project experience
- Ability to think in systems, not just code
- Clean, structured and scalable code
- Good communication skills (German or English required)

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⚠️ Important

We are NOT looking for:
- pure frontend developers
- beginners or people without real-world experience

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🤝 How we work

- Fast, direct communication
- Clear tasks and expectations
- Long-term collaboration possible

We will start with a small paid test task to evaluate fit.

If you are interested, please share:
1. Relevant past projects
2. Your experience with backend systems
3. Your availability

Looking forward to working together.

Summary
The work is to test our app in Taiwan:
- Testers must be located in Taiwan
- Testers must have at least 1 Android or iOS device, with a simcard from Taiwan

The tester must meet the following requirements:
- Being able to call 5 different numbers with an app
- Writing down in a excel file the number shown in the call and the quality of the call

We are seeking a talented developer to join our team for an exciting project. The ideal candidate should have experience in building scalable applications and a strong understanding of modern development practices. You will collaborate with our design and product teams to create a seamless user experience. If you are passionate about technology and looking for a challenging opportunity, we would love to hear from you. Please provide your portfolio and relevant experience when applying.

We have a new recording task in Dutch and are looking for a male native speaker who would be interested in taking part.

The task involves recording prepared sentences in the MARC app on an Android phone. Detailed instructions will be provided on the platform.

Task details:

Language: Dutch
Task type: Voice recording
Number of items: 5100
Required: Male native speaker
Hourly rate: $15
Estimated work pace: approx. 150 items/hour
Deadline: To be estimated

Feedback will be provided by us. If any corrections are requested, the selected recordings will need to be re-recorded.

If you are interested, please let us know.

Hi

I’m currently building a grocery delivery app that connects local stores with customers (similar to a marketplace model).

I’m looking for someone who can help with:

Backend development (orders, users, delivery flow)
POS integration with stores (syncing inventory, pricing, availability)

It would be great if you’ve worked on similar systems (delivery / marketplace apps) before.

Let me know if this is something you’d be interested in, and I can share more details.

**Native Korean language conversation recording project 🎙️**
Project details:
Simply record natural conversations using our app. Topics are easy and relatable like sports , entertainment, music , relationships etc

**Requirements:**
Recording device:** Just smartphone (iPhones or a latest android phone is preferred) and a quiet environment
- **Participants:** Each session requires two people in conversation. If you already have a partner, fantastic! If not, we’ll pair you with someone on Upwork.
- **recording timing :**
Choose 6 topics and record a minimum of 25 minutes per topic—totaling 2:30 hours for the pair.

- *payment:* $10 per hour for each participant.
- **Total payment:** Complete the full session (2.30hours) to get $25$ per person.
Total Payment for both people $50!

No professional experience required—Great opportunity for you to explore new field

- only Open to new participants (those who haven’t joined this same project on Funcrowd before).
***Bonus:***
- Get a 5-star review upon completion!

Let us know if you already have a conversation partner or if you’d like us to pair you with someone through Upwork.

If you have already recorded same conversation recording project before on Funcrowd App then you can’t do it again. One person can do it only once. If you will do same project twice then it will be invalid

This is a great opportunity to do a fun task and get 5* review

• Are you native Korean language speaker born and raised in south Korea?
• Do you have someone native who can join you to do this task together?

We are looking for a developer to build a simple mobile app that helps users learn airport codes using flashcards and Pomodoro-style study sessions. This should be built as simply as possible for the MVP, with a focus on speed and ease of use.

The app will allow users to study airport codes based on specific airlines. For launch, this will include the six major U.S. airlines (United, Delta, American, Southwest, JetBlue, Alaska). Users should be able to select an airline and only study destinations served by that airline.

The app is centered around structured 25-minute study sessions where users review flashcards and take quick quizzes, followed by a short break. The goal is to create a clean, fast MVP (Minimum Viable Product) with core features only—no unnecessary complexity.

Key features include:

* Flashcards (code ↔ city/airport name)
* Basic quiz (multiple choice)
* Pomodoro timer (25/5 sessions)
* “Giving Me Problems” list (save difficult cards)
* Simple results screen (review incorrect answers)

We are looking for someone who values simplicity, can move quickly, and has experience building mobile apps. Bonus if you’ve worked on learning or flashcard-based apps.

• How would you build this MVP as simply and quickly as possible?
• Have you built a flashcard, quiz, or learning app before? Please share examples.

I have a mobile app built in FlutterFlow, but I am currently facing some bugs that need to be fixed.
Some buttons are not working properly, a few actions are not triggering as expected, and some pages are not navigating correctly. I need someone who understands FlutterFlow actions, Firebase, app logic, and conditional flows.
The app is already built, so I do not need a full rebuild. I only need someone to review the current setup, identify the issues, and fix them without breaking the existing structure.
Please apply only if you have experience fixing FlutterFlow bugs.