Senior Web Platform Engineer - Performance & Runtime

Unity Technologies; Helsinki; On-site; EUR 70,000 - 94,000; Full time

Job summary

Unity Technologies in Helsinki is seeking a Senior Software Engineer for the Web Platform team to own core areas of the Unity Web runtime, from design through release. You will work with engineers who built browser technology and help teams grow.

The role focuses on reducing build size, improving startup time, and bringing multi-threading to parts of the runtime. You will collaborate with Web platform teams, mentor colleagues, and push the boundaries of what browser-based Unity can achieve.

Qualifications

• Proficiency in C++ for performance-sensitive code.
• Experience with WebAssembly and Emscripten/LLVM.
• Ability to decompose complex technical problems and work autonomously.
• Experience profiling and optimizing across native and browser boundary.

Responsibilities

• 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

Skills

C++

WebAssembly

C#

JavaScript

Profiling & debugging

Mentoring engineers

Problem decomposition

Tools

Emscripten

LLVM

Job description

Unity Technologies in Helsinki is seeking a Senior Software Engineer for the Web Platform team to own core areas of the Unity Web runtime, from design through release. You will work with engineers who built browser technology and help teams grow.

The role focuses on reducing build size, improving startup time, and bringing multi-threading to parts of the runtime. You will collaborate with Web platform teams, mentor colleagues, and push the boundaries of what browser-based Unity can achieve.