Senior Web Runtime Engineer: High‑Performance WebAssembly

Unity Enterprise; Brighton; Hybrid; GBP 36,000 - 94,000; Full time

Benefits offered by this job

Comprehensive health insurance

Commuting/subsidy

Employee stock ownership

Job summary

Unity is seeking a Senior Software Engineer to join the Web Platform team. You will own meaningful areas of the Web runtime, optimize Web build targets, and work with teams across Unity to deliver fast, reliable browser-based experiences.

The role emphasizes solving deep, multi-language challenges and mentoring engineers to raise code quality. You will collaborate with cross-functional teams to push the frontier of browser capabilities, contributing to performance, loading, and ecosystem

Qualifications

• Deep, hands-on proficiency with C++ in performance-sensitive code.
• Experience with WebAssembly using Emscripten and/or LLVM.
• Ability to decompose complex technical problems and act on own judgment.
• Experience profiling, debugging and optimizing across native and browser boundary.
• Working knowledge of C# and JavaScript.
• Proven track record of mentoring engineers and raising code quality.

Responsibilities

• Own meaningful areas of the Unity Web runtime from design through release.
• Research, design and implement optimizations for the Web build target and asset loading.
• Improve download size, load and startup performance for Web builds.
• Solve low-level problems across C++, C#, and JavaScript at the browser boundary.
• Collaborate with Web platform teams and translate requirements into platform work.
• Mentor teammates and uphold high code quality across the team.

Skills

C++ proficiency

WebAssembly

Problem decomposition

Profiling & debugging

C# & JavaScript

Mentoring

Tools

Emscripten/LLVM

Job description

Unity is seeking a Senior Software Engineer to join the Web Platform team. You will own meaningful areas of the Web runtime, optimize Web build targets, and work with teams across Unity to deliver fast, reliable browser-based experiences.

The role emphasizes solving deep, multi-language challenges and mentoring engineers to raise code quality. You will collaborate with cross-functional teams to push the frontier of browser capabilities, contributing to performance, loading, and ecosystem