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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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