Senior Software Engineer (Web Platform)
Unity
GBR-London, United KingdomOn-siteSeniorPosted Sep 11, 2026
€129,000 total comp€38,170 kept per year on a comfortable lifestyle
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Job description
- In this role, you will own meaningful areas of the runtime outright. This is not website development. We embed Unity inside the browser, and the problems are the deep ones: making a single-threaded platform multi-threaded, cutting megabytes out of a build, getting a game playable in seconds rather than minutes
- You will work alongside engineers who helped invent the browser technology we build on, and you will help the people around you grow
- Own meaningful areas of the Unity Web runtime, from design through to release
- Research, design and implement optimizations to the Web build target, such as stripping unused code from builds and progressively loading assets as a game needs them
- Improve download size, load and startup performance for Web builds, and set measurable targets for it
- Solve uncommon, low-level problems across C++, C# and JavaScript, for example bringing multi-threading to parts of the runtime that are single-threaded today
- Partner with teams across Unity who build on the Web platform, translating what they need into platform work
- Mentor teammates and help set the bar for code quality across the team
- Keep Unity at the frontier of the Web’s constantly evolving capabilities
Benefits
- Comprehensive health, life and disability insurance
- Employee stock ownership
- Generous vacation and personal days
- Office food and free snacks, lots of health options!
- Employee Resource Groups
- Training and development programs
- Commute subsidy
- Competitive retirement/pension plans
- Paid leave for new parents
- Mental Health and Wellbeing programs and support
- Global Employee Assistance Program
- Volunteering and donation matching program- A proven track record of mentoring engineers and raising code quality standards
- Effective written/verbal communication with peers, managers and key decision makers in other teams
- Development experience with WebAssembly, using Emscripten and/or LLVM
- Working knowledge of C# and JavaScript
- Experience profiling, debugging and optimizing across the native and browser boundary
- Deep, hands-on proficiency with C++ in performance sensitive code
- Ability to decompose complex technical problems and complete them on your own technical judgment
- Familiarity with compression methodologies and build size reduction
- Deeper domain knowledge of rendering, physics or audio in a real-time 3D engine
- Experience contributing to a browser engine or browser runtime
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