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Freelance Unity Game Developer Jobs in Renton, WA

FlowPlay, Inc.

Client Engineering Manager

Seattle, WA · On-site

$160K - $190K/yr

Who We Are FlowPlay is a leading developer of online virtual worlds and casual free-to-play games ... We are looking for a well-rounded engineering leader who is equally comfortable discussing Unity ...

Flowplay, LLC

Client Engineering Manager

Seattle, WA · Hybrid

Who We Are FlowPlay is a leading developer of online virtual worlds and casual free-to-play games ... We are looking for a well-rounded engineering leader who is equally comfortable discussing Unity ...

Flowplay, LLC

Client Engineering Manager

Seattle, WA · On-site

$160K - $190K/yr

Who We Are FlowPlay is a leading developer of online virtual worlds and casual free-to-play games ... We are looking for a well-rounded engineering leader who is equally comfortable discussing Unity ...

AditiStaffing

audio engineer

Redmond, WA

Game Audio Engineer (Oculus) Duration: 6+ Months (possibility of extension) Duties:Implement ... Unity and Unreal * 3+ years of experience in game audio software development * In-depth ...

Ten4

Unreal Engineer - VR/Virtual Reality

Seattle, WA · On-site +1

Unity is a major plus * Passion for interactive experiences, games, and VR/AR * Experience in VR/AR is a major plus * Computer Science Degree and an MS Degree preferred Qualifications * Developers ...

Ten4

Senior Software Engineer - VR/Virtual Reality

Seattle, WA · On-site +1

$139.40K - $183.80K/yr

Unity is a nice to have, but not a necessity * Passion for interactive experiences, games, and VR ... Developers and Engineers who want to solve challenging Virtual Reality problems * Inventive and ...

Merican

OpenXR App Developer

Redmond, WA · On-site

$48 - $50/hr

Hands-on experience shipping 3D real-time applications (XR, games, simulation, or visualization ... Unity (C#) and OpenXR plugin ecosystem, or * Unreal (C++) XR pipeline, or * Custom/native OpenXR ...

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How much do freelance unity game developer jobs pay per year?

As of May 30, 2026, the average yearly pay for freelance unity game developer in Renton, WA is $122,011.00, according to ZipRecruiter salary data. Most workers in this role earn between $91,700.00 and $139,500.00 per year, depending on experience, location, and employer.

What is a Freelance Unity Game Developer job?

A Freelance Unity Game Developer is a self-employed professional who creates, prototypes, and develops games or interactive experiences using the Unity game engine. They typically work on a project basis for clients, handling tasks such as coding, asset integration, debugging, and optimization. Freelancers may collaborate with designers, artists, and other developers to bring games to life. Their job requires proficiency in C#, knowledge of Unity's tools and systems, and problem-solving skills. They often manage their own schedules, client communication, and project scope.

What are the key skills and qualifications needed to thrive in the Freelance Unity Game Developer position, and why are they important?

To thrive as a Freelance Unity Game Developer, you need strong proficiency in C# programming, Unity engine expertise, and experience in 2D/3D game development, supported by a solid portfolio. Familiarity with source control systems (like Git), project management tools (such as Trello or Jira), and sometimes Unity certifications is often expected. Excellent communication, self-motivation, time management, and problem-solving skills help you excel in remote or client-based projects. These competencies are crucial for delivering high-quality games, maintaining effective client relationships, and managing the varied demands of freelance work.

What are some common challenges freelance Unity game developers face, and how can they be managed?

Freelance Unity game developers often encounter challenges such as juggling multiple projects, ensuring clear communication with remote clients, and managing fluctuating workloads or income streams. Staying organized with effective project management tools and setting clear timelines with clients can help manage these demands. It's also important to regularly update technical skills and maintain a strong professional network to secure consistent work. Overcoming these challenges can lead to a rewarding freelance career with increased flexibility and the ability to work on diverse, creative projects.
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Principal Game Engine Engineer, Platform

Worldscape Technology Inc.

Redmond, WA

Full-time

Posted 9 days ago

Job description

Worldscape is a cutting-edge platform designed to unify distributed data, sensors, and intelligent agents across cloud, on-prem, and edge environments. By combining geospatial intelligence, physics-based 3D simulation, and reward-driven AI, Worldscape enables organizations to build immersive digital twins for predictive modeling, scenario planning, and adaptive decision-making. With a zero-trust security framework, seamless integration with legacy systems, and robust developer tools, Worldscape empowers rapid deployment of agentic applications that drive resilience and efficiency in sectors like logistics, telecom, defense, and infrastructure. 

Worldscape is seeking an experienced Principal Game Engine Engineer to join our fast-moving, innovative Platform team. The Principal Game Engine Engineer will participate in the design, implementation, and optimization of the real‑time physics systems that underpin the simulation in our applications. You will architect scalable physics solutions, integrate tightly with the data fabric, animation, and rendering pipelines, and drive innovation in physics-led simulation techniques to deliver responsive interactions across vehicles, environments, and all other simulation assets. As a Principal Engineer you will set technical directions, mentor engineers, and partner with Platform and Product Management to turn creative vision into performant, shippable features and customer applications. 
 
This is an onsite role located in Redmond, WA. 
Key Attributes:
  • Innovation Mindset: Passion for pushing the boundaries of real-time physics in interactive simulation. 
  • Leadership & Mentorship: Ability to guide developers, set technical direction for an area, and enforce best practices.
  • Problem-Solving: Creative and analytical approach to complex simulation challenges.
  • Communication: Clear articulation of technical concepts to non-technical stakeholders. 
Responsibilities:
  • Own the physics architecture: Define data models, simulation loops, solver strategies, and integration points across engine and simulation systems.
  • Deliver core physics features: Collision detection (broad‑phase/narrow‑phase), entity controllers, vehicle dynamics with an emphasis on orbital mechanics, particles/fluid mechanics (with an emphasis on atmospheric dynamics).
  • Integrate with simulation logic (gameplay) & animation: Build physics‑driven interactions, authoring tools, and runtime hooks (e.g., inverse kinematics, state machines, event systems).
  • Performance ownership: Profile, optimize, and budget frame time and memory across platforms; lead multi-threading/Job System/SIMD efforts; evaluate GPU compute opportunities.
  • Stability & robustness: Establish test suites, golden scenarios, and verification and validation practices; reduce edge‑case instability (stacking, tunneling, jitter, constraint drift).
  • Tooling & workflow: Build/debug tools, visualizers, probes, and authoring pipelines that accelerate designer iteration and QA efficiency.
  • Cross‑functional leadership: Partner with back-end, AI, data pipeline, and platform teams; communicate constraints/trade‑offs; align milestones with production.
  • Mentorship & standards: Guide engineers via reviews, design docs, and coding standards; cultivate a high bar for craft, documentation, and reproducibility.
  • Quality & live support: Own crash triage and regression control for physics; support content changes post‑launch without destabilizing the simulation. 
Professional Qualifications:
  • Education: BS/MS in Computer Science, Software Engineering, Physics, Mathematics (or equivalent practical experience).
  • Experience: 10+ years in real‑time/game physics engineering; 2+ shipped titles with substantial physics ownership (AA/AAA preferred).
  • Programming: Expert C++ (modern standards), data‑oriented design, memory management, profiling/debugging (VTune, PIX, Nsight, RenderDoc, etc.).
  • Rigid‑body dynamics, collision detection (GJK, SAT, continuous collision detection/time of impact), integration schemes (semi‑implicit Euler, RK, constraint solvers).
  • Numerical stability, error control, and performance trade‑offs under real‑time constraints.
  • Engine Integration: Experience integrating physics with animation (animation blending, IK), gameplay systems, and rendering pipelines.
  • Performance: Multi-threading/job systems, SIMD/vectorization, cache‑friendly data structures, frame/memory budgeting across platforms.
  • Collaboration: Proven ability to lead cross‑disciplinary efforts and communicate complex technical topics clearly. 
Preferred Qualifications:
  • 15+ years’ experience in Modern Game Engines & Middleware: Unreal Engine (Chaos), Unity (DOTS/Physics), Havok, Bullet, PhysX; custom engine experience strongly preferred.
  • 10+ years’ experience in Advanced Simulation: Fracture systems, granular materials, vehicle tire models, buoyancy/aero effects; GPU compute (CUDA, compute shaders).
  • Experience with existing physics models and systems integration.
  • Networking: Deterministic simulation strategies, rollback/prediction, server authority models, cross‑platform latency mitigation.
  • Console/Platform: Shipping experience on Xbox, PlayStation, Switch, and PC; familiarity with platform TRCs/TCRs and performance certification.
  • Tooling & Scripting: Python/C#/Lua for tools and editor extensions; in‑engine visualization/debugging overlays.
  • Optimization Expertise: Broad‑phase structures (sweep-and-prune, BVH), island building, sleeping strategies, CCD tunneling avoidance; job scheduling and affinity tuning.
  • Content Pipelines: Collaboration with design/tech art to create authoring guidelines for physics assets; LOD strategies for physics complexity. 
Final compensation will be determined based on factors such as experience, skills, and qualifications. In addition to base salary, this role may be eligible for performance-based bonuses and equity awards. 
Why Worldscape? 
There is nothing more important to Worldscape than our culture. It is the fundamental means by which we will succeed as an organization. Talent, ability, drive, experience, knowledge cannot be maximized without first embracing the culture we espouse and will live every single day.  Worldscape offers great benefits, opportunities for continued growth, and the ability to directly affect change in our organization and be part of a high-growth startup at a pivotal stage. 

What we offer: 
- Competitive salary and meaningful equity 
- Attractive benefits package  
- Flexible time off policy 
- Medical, Dental and Vision insurance 
- HSA health insurance options 
- 401k plan 
- Basic and Voluntary Life Insurance
- Fast paced environment with flexibility and ownership
 
Worldscape is committed to creating a diverse and inclusive workplace and is proud to be an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to age, color, gender identity or expression, marital status, national origin, disability, protected veteran status, race, religion, pregnancy, sexual orientation, or any other characteristic protected by applicable laws, regulations and ordinances.

Employment is contingent upon successful completion of a background check.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.