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PX4/Gazebo Flight Simulation Engineer for Custom Tailsitter VTOL

We are looking for an experienced UAV simulation and flight-dynamics engineer to develop a practical engineering simulator for a custom electric tailsitter VTOL aircraft.

The simulator will be used actively throughout aircraft development to validate configurations, tune PX4, investigate flight-test issues, evaluate design changes and reduce risk before physical testing.

This is an engineering simulation project, not a game or marketing visualization project.

Scope

The selected contractor will:

Build a custom aircraft model in modern Gazebo
Integrate the model with PX4 SITL and QGroundControl

Prepare the provided CAD model for simulation
Help calculate mass, center of gravity and moments of inertia

Configure motors, propellers, elevons, sensors and actuator mapping

Develop an initial aerodynamic model for hover, transition and fixed-wing flight

Create configurable wind, payload, CG and propulsion conditions

Build basic Python tools for launching, resetting and automating test scenarios

Enable PX4 logging and repeatable comparison of simulation results

Structure the system so Unreal Engine visualization and hardware-in-the-loop testing can be added later

We will provide aircraft CAD, component specifications, propulsion information, avionics configuration, physical measurements and available flight logs.

Initial Deliverables
Working PX4 SITL, Gazebo and QGroundControl workflow
Custom tailsitter aircraft model
Documented mass, CG and inertia calculations
Correct motor, elevon and sensor configuration
Vertical takeoff, controlled hover and landing
Transition to stable forward flight and return to hover
Adjustable aircraft and environmental parameters
Direct actuator-testing workflow
Repeatable engineering test scenarios
PX4 ULog capture and analysis workflow
Source code, setup documentation and technical handover

The simulator must remain usable without Unreal Engine. Gazebo should be the authoritative physics environment, while the architecture should allow a synchronized Unreal visualization and camera-simulation layer to be added in a later phase.

Required Experience
PX4 SITL
Gazebo
QGroundControl and MAVLink
UAV flight dynamics
Fixed-wing or VTOL aircraft simulation
C++ and Python
Aircraft mass properties and inertia calculations

Experience with tailsitters, differential thrust, PX4 control allocation, hardware-in-the-loop simulation or Unreal Engine is strongly preferred.

When Applying

Please include:

Examples of custom UAV simulations you have developed.
Your experience with PX4 and Gazebo.
Your approach to modeling a two-motor tailsitter with elevons and differential thrust.
How you would calculate and validate CG and moments of inertia.
How you would calibrate the simulation using physical tests and flight logs.
Your estimated timeline and proposed milestone structure.
Links to relevant repositories, videos or technical work.

I have a STEP file of an industrial robot. I want you to:

1. Export the CAD assembly.

2. Import into CoppeliaSim, or some other robot simulation software that I can also obtain access to.

3. Define the six revolute joints.

4. Assign masses and inertias.

5. Add a gripper or tool.

6. Program trajectories. This will be tricky. I have multiple positions to convey. I am an engineer. So, I know the concepts. Just need help in conveying them to you.

7. Record the simulation.

I am presently looking for one or more contractors to help with forensic 3D visualization work on a project by project basis. The work supports technical analysis and demonstrative exhibits used in litigation, insurance, and government matters, so accuracy, repeatability, and a defensible methodology matter more than cinematic polish.

You will be working from: laser scan point clouds, drone photogrammetry, surveillance video, dashcam and body cam footage, scene photographs, vehicle scans, and physical measurements.

If you have the 3D skills but are new to some of the forensic specific methods, say so in your proposal. I am happy to walk you through the forensic side.

What you’ll be doing
• Building accurate 3D scene and vehicle models from laser scan point clouds, photogrammetry, and survey data
• Registering, cleaning, decimating, and meshing point clouds, and converting point cloud data into usable geometry for animation and analysis
• Generating photogrammetric models from photographs and drone imagery when scan data isn’t available
• Lens distortion removal and camera calibration for still photographs and video footage from a wide range of cameras (surveillance, dashcam, body cam, cell phone, action cameras)
• Reverse projection photogrammetry / camera matching, meaning solving camera position, orientation, and focal length to place evidence imagery into a measured 3D environment
• Speed and position determination from video by camera matching vehicle or pedestrian positions across sequential frames and extracting time distance data
• Producing forensic animations and still exhibits driven by reconstruction data (EDR/ACM crash data, timing analysis, sight line and visibility studies, occupant kinematics, day/night and lighting conditions)
• Sight line, obstruction, and visibility analysis from driver eye position
• Documenting your workflow clearly enough that the methodology can be explained and defended under cross examination
Required skills and experience
• Strong, demonstrated proficiency in Autodesk 3ds Max (primary pipeline)
• AutoCAD and general Autodesk ecosystem familiarity
• Working knowledge of Autodesk ReCap or equivalent point cloud processing
• Hands on experience with 3D point clouds and meshes: registration, cleanup, decimation, retopology, and mesh generation
• Understanding of real world scale, coordinate systems, and measurement accuracy. Everything must be dimensionally correct and traceable back to source data
• Comfortable working from imperfect, incomplete, real world evidence rather than clean CAD input
• Clear written communication in English and reliable responsiveness
• Ability to work under confidentiality. An NDA is required before any case material is shared
Software (experience with any subset is valuable, tell me which)

Core:
• Autodesk 3ds Max
• AutoCAD
• Autodesk ReCap
• Adobe Creative Suite (After Effects, Photoshop, Premiere)
Camera matching / tracking / photogrammetry:
• PFTrack
• SynthEyes
• Agisoft Metashape, RealityCapture, or equivalent photogrammetry package
• CloudCompare, FARO Scene, Leica Cyclone, or similar point cloud tools
Modeling, animation, and simulation:
• Autodesk Maya
• Autodesk MotionBuilder
• ZBrush
• Substance Painter
• SideFX Houdini
• Blender (acceptable as a supplement, not a replacement for the Autodesk pipeline)
Video forensics:
• Axon Investigate, iNPUT-ACE, or comparable forensic video analysis software
Bonuses
• You already hold your own licenses for some or all of the above. This is a meaningful plus and will factor into rate negotiation. If you don’t, I can provide or purchase licenses for the tools a project requires. It is not a disqualifier, just tell me up front what you have and what you’d need.
• Experience with, or willingness to learn, vehicle crash simulation software such as PC-Crash, HVE, or Virtual CRASH. This is a bonus and not a requirement. I am glad to bring someone up to speed on these platforms if the rest of your skill set is strong.
• Your own capable workstation (GPU, RAM, and storage adequate for large scan datasets)
Terms
• Contract, project based, with the potential for steady ongoing work for the right people
• I expect to hire more than one contractor from this posting
• Some work is deadline driven around litigation schedules. Realistic availability estimates matter more than optimistic ones
• All case material is confidential. NDA required.

To apply
Please don’t send a generic proposal. Address the following directly:
1. Which of the listed software packages do you use regularly, and which do you hold your own license for?
2. Describe a project where you camera matched footage or a photograph into a 3D environment. What software did you use, and how did you handle lens distortion?
3. Have you worked with laser scan point clouds? What was the source (FARO, Leica, Trimble, drone photogrammetry) and what did you do with the data?
4. Share portfolio work most relevant to this posting. Technical or measurement driven work is far more useful to me than a demo reel. Redact or omit anything confidential.
5. What is your typical availability per week, and your time zone?
Applications that ignore these questions will not be reviewed.

We are seeking a skilled freelancer to develop a D+ bra with innovative bioengineering solutions. The project involves designing and manufacturing a bra that provides optimal support and comfort using cutting-edge bioengineering techniques. The ideal candidate will have experience in product design and bioengineering, with a focus on creating functional and aesthetically pleasing products.

I'm looking for a chemical engineer specialized in heat integration, specifically for optimizing heat exchanger networks. The main objective of this project is process optimization.

Ideal Skills and Experience:
- Expertise in chemical engineering principles
- In-depth knowledge of heat exchanger networks
- Experience with process optimization techniques
- Strong analytical and problem-solving skills
- Familiarity with simulation software (e.g., HINT)

If you have a proven track record in similar projects and can deliver efficient solutions, please submit your proposal.

Skills: Engineering, Matlab and Mathematica, Mechanical Engineering, Electrical Engineering, Chemical Engineering, Thermal Analysis, Energy Modelling, Aspen HYSYS, Process Engineering, Energy Auditing

Solar Engineer (Chinese national living in Vietnam)
WIDEX SOLAR leads the charge in delivering tailored renewable energy solutions across the region. Our comprehensive expertise in cutting-edge green technologies and innovative financing options empowers businesses to achieve their sustainability goals. We are committed in helping each client optimize their approach, reducing both costs and save the planet.

Mandatory Requirements
Chinese national legally residing in Vietnam.
Available for part-time/freelance engagement on rooftop solar projects in Vietnam.
Able to travel to project sites throughout Vietnam as required.

Key Responsibilities
1. Construction Supervision
Monitor construction progress and workmanship throughout all project stages, including mounting structure installation, equipment installation, electrical connections, testing, and commissioning.
Ensure contractors comply with occupational health and safety (OHS) regulations, including working at height, personal protective equipment (PPE) requirements, and fire prevention measures.
Coordinate with contractors to resolve on-site issues, such as design discrepancies, non-compliant materials, and changes in customer requirements.
Organize progress review meetings and provide regular project updates to the management team.
2. Quality & Safety Management
Conduct routine inspections and testing, including grounding resistance, insulation resistance, and solar PV system performance.
Assess technical risks and recommend appropriate corrective and preventive actions.
Inspect and monitor contractors to ensure compliance with safety and quality procedures throughout the construction process.
3. Internal & External Coordination
Coordinate with internal departments to ensure engineering drawings, materials, and construction plans support the overall project schedule.
Work closely with the Project Manager and contractors to resolve technical and construction-related issues.
Liaise with power utilities and relevant authorities during inspection, grid connection, and system commissioning, when required.
4. Documentation & Reporting
Prepare detailed reports on construction progress, quality performance, and technical issues for management.
Review and accept as-built documentation, handover dossiers, and operation & maintenance (O&M) manuals submitted by contractors.
Monitor system performance after handover and coordinate with relevant stakeholders to resolve any operational or technical issues that arise.

Candidate Requirements
1. Education
Bachelor's degree in Electrical Engineering, Electronics Engineering, Renewable Energy, or a related discipline.
2. Experience
Minimum one (1) year of experience in the electrical or solar energy industry.
Candidates with experience supervising the construction of rooftop solar projects of 500 kWp or above will be given preference.
3. Personal Attributes
Detail-oriented and proactive.
Committed to long-term employment.
4. Skills
Proficient in AutoCAD and Microsoft Office.
Experience with PVsyst or other power system simulation software is an advantage.
Able to read and understand technical documentation in English; spoken English communication skills are an advantage.
Able to interpret structural drawings and possess knowledge of roofing materials and roof structures.
Strong negotiation and conflict resolution skills when working with contractors.

Skills: Project Management, Electrical Engineering, AutoCAD, Traditional Chinese (Hong Kong), Risk Assessment, Construction Management

We are seeking a skilled freelancer to develop an Isaac Sim AMR project using our provided CAD/STEP file. The project involves setting up basic teleoperation capabilities with a camera and other sensors. The ideal candidate will have experience in robotics and simulation, particularly with Isaac Sim, and be able to integrate the necessary components for teleoperation.

Freelance Power Electronics Engineer – Custom 3-Phase Integrated Magnetic Core Design

We are seeking a highly qualified Power Electronics / Magnetics Design Engineer to design a custom 3-phase integrated reactor/transformer capable of simultaneous common-mode and differential-mode filtering (similar to a matrix/all-mode filter architecture).

This is a specialized project requiring expertise in custom magnetic component design. We are looking for an engineer with experience designing transformers, reactors, inductors, and magnetic components for industrial power applications.

Project Scope:
Design a custom 3-phase integrated reactor/transformer capable of simultaneous common-mode and differential-mode filtering (similar to a matrix/all-mode filter architecture).

Required Deliverables:
Magnetic simulation and flux path analysis using tools such as Ansys Maxwell, MATLAB/Simulink, LTspice, or equivalent magnetic FEA software.
A complete specification sheet detailing:
Core material recommendations (Nanocrystalline, Sendust, High-Flux silicon steel, or similar)
Wire gauge
Turn counts
Air gap configuration
Manufacturing-ready CAD drawings and schematics suitable for a custom magnetics manufacturer.
Required Expertise
Inductor and transformer design
Magnetic component design
High-frequency harmonics mitigation
VFD filter applications
Power electronics
Industrial power systems
Preferred Software Experience

Please indicate your experience with:
Ansys Maxwell
PLECS
MATLAB/Simulink
LTspice
Other magnetic Finite Element Analysis (FEA) simulation software
Please Include in Your Proposal

To help us evaluate your experience, please include:
Examples of previous transformer, reactor, inductor, or magnetic component designs.
A brief description of the magnetic simulation software you use.
How you calculate thermal performance and temperature rise of the core and windings.
Examples of manufacturing documentation you have prepared, including BOMs and winding charts suitable for custom manufacturers.

We are looking for an experienced engineer capable of delivering a complete, manufacturing-ready magnetic design for production.

I need a specialist who can take one of our existing pieces of industrial machinery and retrofit it so it draws significantly less power while keeping—or ideally improving—its current output. The core objective is clear: increase overall efficiency by cutting energy consumption.

Your task starts with a thorough assessment of the present drive systems, motors, control panels, sensors, and power-management components. From there we will agree on the most practical upgrade route, whether that means installing high-efficiency motors and variable-frequency drives, redesigning control logic with PLCs, or incorporating real-time energy-monitoring hardware and software.

Key deliverables
• Diagnostic report outlining baseline energy use, points of loss, and recommended retrofits
• Bill of materials and sourcing list for all new parts or modules
• Implementation plan with step-by-step integration instructions and projected downtime
• On-site (or remote) installation support, tuning, and safety verification
• Post-retrofit performance data demonstrating the targeted reduction in kWh per production cycle

I already have basic schematics and operating manuals, and the machine is accessible for detailed inspection. Please highlight similar projects you have completed, the tools or platforms you prefer—such as Siemens or Allen-Bradley PLCs, energy-monitoring suites, CAD or simulation software—and your projected timeline to hit each milestone.

Skills: Wireless, Engineering, Electronics, Electrical Engineering, Industrial Engineering, Automation, PLC, Process Engineering, Control Systems Engineering (PID / MPC)

We need a developer to build a full-featured simulator on the CARLA open-source platform for practical driving training and human-factors research. The same codebase should support instructor-led training (urban, highway, off-road) and experimental modes for studying stress, drowsiness, and cognitive load on driving behavior. Both left-hand and right-hand driving configurations are required.

Core requirements:

Ready-made scenarios with dynamic actors (vehicles, pedestrians, cyclists) and weather/time variations, configurable via file or script.

Authentic vehicle dynamics (acceleration, braking, steering) using a preferred physics plug-in that integrates with CARLA's API.

Research hooks to trigger events (obstacles, reduced visibility, distractions) and log driver inputs, biometrics, and vehicle telemetry at millisecond precision, with a TCP/UDP or REST interface for external device sync (e.g., heart-rate, eye-tracking).

A user-friendly training dashboard with admin panel for scenario selection, objective setting, and performance metric review (speed, lane keeping, reaction time).

Deliverables:

Source code in a private Git repository with clear commit history.

A one-click installer or Docker image for Windows and Linux.

At least seven demo scenarios per driving context (urban, highway, off-road, hills, night, rain, peak traffic).

Documentation: setup guide, API reference, and sample research scripts.

A short video walkthrough proving dynamics fidelity and scenario switching.

Acceptance criteria:

Installer launches CARLA with all assets on a clean machine.

Speeds, accelerations, and steering angles match real vehicle data within ±5%.

Scenario reload takes greater and equal to 10 seconds without crashing.

Logged data streams have timestamp drift greater than 2 ms over a 30-minute session.

To apply: Share links to prior CARLA modifications, reinforcement-learning projects, or published human-factors work. All communication and work will remain on Upwork per platform policy. Do not share contact details in your proposal.

I'm launching a new website for my art and I'm looking for someone to create a premium 10–15 second looping hero animation for the homepage.

I create contemporary butterfly artwork, and I'm looking for a custom animation that reflects my brand. I have a reference video that captures the overall mood and quality I'm looking for. However, I do not want to copy it. Instead, I'd like you to create an original concept inspired by my artwork.


If this sounds like a project you'd be interested in, I'd love to hear your ideas, estimated timeline, and fixed-price quote.

Thank you, and I look forward to hearing from you.

I need a freelancer to take a SolidWorks 3D model or STEP file representing a factory production line and create a line simulation of the process. The ideal candidate should have experience with SolidWorks and simulation software to accurately model the production line's dynamics. This project requires an intermediate level of proficiency and offers a part-time engagement over 1 to 3 months.

We are looking for an experienced engineer specializing in building acoustic simulation to support the development and optimization of innovative wall systems.

Requirements
Proven experience in building acoustic simulation.
Proficiency in acoustic simulation software such as INSUL, CadnaA, Odeon, SoundPLAN, or equivalent.
Experience in evaluating airborne sound insulation (STC/Rw), acoustic insulation systems, wall assemblies, and insulation materials.
Strong knowledge of building acoustics, sound transmission, and acoustic insulation design.
Experience in the building/construction industry is mandatory.

Preferred Qualifications
Experience with thermal simulation of building envelopes.
Ability to calculate and analyze U-values, thermal transmittance, and wall thermal performance using software such as THERM, HEAT3, WUFI, or equivalent.
Familiarity with international standards (ISO, ASTM, EN, etc.) related to building acoustics and thermal performance.
Scope of Work
Develop acoustic simulation models for building wall systems.
Evaluate different wall configurations and insulation materials.
Optimize acoustic and thermal performance through simulation.
Provide technical reports and design recommendations.

Important: Please do not apply unless you have proven experience in building acoustic simulation using the software mentioned above or equivalent. Applicants without the required experience will not be considered.

Looking for a CGI / 3D video artist to create two premium, science-led simulations for Brillare / Root Deep.

The artist should be able to manage the full process from ideation, visual treatment, storyboarding, 3D simulation, animation, rendering, and final output.

Output 1: Water-in-Oil Microemulsion Technology
Create a luxury 3D simulation showing peptide molecules encapsulated inside oil droplets through microemulsion technology. The clips should explain how water-based actives are carried within oil droplets for better scalp-barrier compatibility and targeted follicle delivery.

Output 2: Follicle Science Ecosystem
Create a 3D simulation showing how Root Deep works on the follicle ecosystem through three actions: exfoliation and balance, stimulation and nourishment.

Visual Direction
The output should feel premium, clinical, luxurious, and science-led.
Use the brand palette of orange, ivory white, transparent gold, soft scalp tones, glass textures, clean reflections, and cinematic macro lighting.

Avoid anything cartoonish, overly medical, neon, cheap-looking, or generic biotech.
Final output should be adaptable for brand films, website science sections, reels, salon education, presentations, and marketplace content.

Reference attached.

I need to hire a CAD designer with fabrication and materials experience. I am an acoustics specialist that designs large exhaust mufflers/silencers (e.g. 8m long by 4m diameter). Once the basic 3D design is done in my simulation software, I need a designer to complete the fabrication drawings. The ideal candidate should have experience in both design and fabrication processes because the CAD file you will be given wont have any thicknesses, attachment points, etc. You will need to work with me to specify these points so we have a set of drawings that can 1) actually be fabricated (i.e. there are no parts of the design that are physically impossible to make 2) the silencer wont fail (e.g. when moved it wont break under its own weight or wont fail due to the exhaust gas pressure inside, etc..).

Attached is a simple example showing what I would give you. I would of course be available for questions/clarification.

What I would want from you is a full drawings package I can just hand to my fabrication team.

Ideally I want to use AutoCAD, but open to your preference.

I have a cyber-physical product in development and need a solid SysML model built in Cameo to capture the complete system architecture. My immediate priority is to map out the blocks, interfaces, and behaviors that govern how all electronic, mechanical, and embedded-software elements communicate with each other.

What I need from you
• A well-structured Cameo project file with package hierarchy, block definition, internal block, sequence, and activity diagrams that together describe the end-to-end architecture.
• Clear allocation of communication protocols across hardware and software components so it is obvious where messages originate, how they flow, and where they terminate.
• Sufficient stereotypes, constraints, and parametrics to make the model executable for future trade-off analysis.
• Brief model-based documentation (PDF or HTML) generated from Cameo, outlining assumptions and key design decisions.

Acceptance criteria
1. Cameo project opens without errors or missing profiles.
2. All physical blocks have ports typed with the correct protocol interfaces.
3. Every protocol interaction is represented in at least one sequence diagram linked back to the respective blocks.
4. Documentation automatically syncs with the model and reflects the latest state.

If you work daily with SysML v1.6 (MagicDraw/Cameo Systems Modeler) and have experience modeling communication layers in mixed hardware-software environments, I would love to see examples of your previous models or screenshots demonstrating clarity and consistency.

Skills: Wireless, Engineering, Mechanical Engineering, Audit, Network Administration, Systems Engineering, Embedded Systems, Simulation, Software Engineering, Six Sigma

Location: Remote
Type: Part-Time / Contract

Responsibilities
Develop and maintain applications using ROS/ROS2.
Integrate sensors, cameras, LiDAR, and robotic hardware.
Build and debug ROS nodes, topics, services, and actions.
Implement navigation, localization, and motion control.
Work with C++ and Python on Ubuntu/Linux.
Test and deploy robotic software on real hardware and in simulation.
Requirements
2+ years of hands-on experience with ROS/ROS2.
Strong proficiency in C++ and Python.
Experience with Linux, Git, and Gazebo/RViz.
Knowledge of SLAM, Navigation Stack/Nav2, TF, and sensor integration.
Experience working with mobile robots or robotic arms.
Ability to work independently and deliver on milestones.
Nice to Have
OpenCV or PCL
MoveIt
NVIDIA Jetson
Docker
AI/Computer Vision integration

To Apply: Share your resume along with GitHub, ROS projects, or videos demonstrating robots you've worked on.

We are seeking an experienced Electrical, Electronics, or Embedded Systems Engineer to develop a professional engineering simulation. The project involves creating a simulation to demonstrate the operation of a specific system, focusing on accuracy and realism. The ideal candidate will have a strong technical background and experience in engineering simulations.
# Simulation Engineer Needed – Proof of Concept for Revolutionary Energy Management Technology (Instacharge)

## Project Overview

We are seeking an experienced Electrical, Electronics, or Embedded Systems Engineer to develop a professional engineering simulation demonstrating the proof of concept for our proprietary Instacharge technology.


The simulation will be used for proof-of-concept validation.

## Scope of Work

The selected engineer will:

* Review our technical concept and system architecture.
* Recommend the most appropriate simulation software (MATLAB/Simulink, LTspice, ANSYS, COMSOL, PSpice, Multisim, or similar).
* Build a professional electrical simulation of the proposed system.
* Demonstrate energy flow through the system.
* Simulate voltage regulation and controlled power delivery.
* Include realistic assumptions and engineering calculations.
* Produce clear block diagrams and system architecture diagrams.
* Validate that the proposed design operates logically within accepted engineering principles.
* Provide recommendations for improvements where appropriate.

## Required Deliverables

* Complete engineering simulation files.
* Professional engineering report explaining the simulation.
* Block diagram of the complete system.
* Energy flow diagram.
* Voltage/current analysis.
* Assumptions and limitations documentation.
* Executive summary suitable for investors.
* **A professional video (5–10 minutes) showing the simulation running while explaining how the system operates and demonstrating the proof of concept.**

## Required Experience

Please apply only if you have experience with:

* Electrical Engineering
* Electronics Design
* Embedded Systems
* Power Electronics
* Energy Storage Systems
* Battery Management Systems
* Supercapacitors
* Graphene or advanced energy storage (preferred)
* Simulation software such as MATLAB/Simulink, LTspice, ANSYS, COMSOL, PSpice, Multisim, or equivalent

## To Apply

Please include:

* Examples of previous engineering simulations.
* Similar hardware or power electronics projects.
* Software you plan to use.
* Estimated timeline.
* Fixed-price quote.
* Confirmation that all work will remain confidential and that all intellectual property will be assigned to the client.

A signed NDA will be required before detailed technical information is shared.

We are looking for a long-term engineering partner who can continue into prototype development after the simulation phase if the project is successful.