Senior Software Engineer, Web Platform

Unity Technologies; Brighton; Remote; GBP 46,000 - 86,000; Full time

Benefits offered by this job

Health insurance

Commute subsidies

Employee stock ownership

Retirement or pension plans

Vacation and personal days

Parental leave and family-care

Mental health and wellbeing support

Employee resource groups

Training and development

Volunteering and donation matching

Job summary

Unity Technologies in the United Kingdom is hiring a Senior Software Engineer for the Web Platform team to advance the Unity Web runtime across browsers and devices. You will tackle multithreading, code size reductions, and time-to-play improvements, collaborating with engineers across Unity to translate needs into platform work and mentor teammates as the team pushes Web capabilities forward.

The role supports remote work in the UK, Finland, or Lithuania, with UK Zone A/B and European ranges

Qualifications

• Deep, hands-on proficiency with C++ in performance-sensitive code
• Development experience with WebAssembly using Emscripten and/or LLVM
• Ability to break down complex technical problems and complete work with independent technical judgment
• Experience profiling, debugging, and optimizing across the native and browser boundary
• Working knowledge of C# and JavaScript
• Strong written and verbal communication with peers, managers, and other teams
• Proven mentoring experience to raise code quality
• English proficiency for professional communication worldwide
• Desirable: browser engine or runtime contributions
• Desirable: rendering/physics/audio knowledge in real-time 3D engine
• Desirable: familiarity with compression/build-size reduction

Responsibilities

• Own meaningful areas of the Unity Web runtime from design through release
• Research, design, and implement optimizations for the Web build target
• Improve download size, loading, and startup performance for Web builds
• Solve low-level technical problems across C++, C#, and JavaScript
• Collaborate with Unity teams to translate needs into platform work
• Mentor teammates and help set code quality standards
• Keep Unity at the frontier of evolving Web capabilities

Skills

C++

WebAssembly

C#

JavaScript

Mentoring

Communication

English

Independent judgment

Debugging

Tools

Emscripten

LLVM

Job description

Salary: £46,000 - 86,000 per year

Requirements:

• Deep, hands-on proficiency with C++ in performance-sensitive code
• Development experience with WebAssembly using Emscripten and/or LLVM
• Ability to break down complex technical problems and complete work using independent technical judgment
• Experience profiling, debugging, and optimizing across the native and browser boundary
• Working knowledge of C# and JavaScript
• Effective written and verbal communication with peers, managers, and decision-makers in other teams
• Proven track record of mentoring engineers and raising code quality standards
• English proficiency sufficient for professional verbal and written communication with colleagues and partners worldwide
• Desirable: Experience contributing to a browser engine or browser runtime
• Desirable: Deeper domain knowledge of rendering, physics, or audio in a real-time 3D engine
• Desirable: Familiarity with compression methodologies and build-size reduction

Responsibilities:

• Own meaningful areas of the Unity Web runtime, from design through release
• Research, design, and implement optimizations for the Web build target, including removing unused code and progressively loading assets
• Improve download size, loading, and startup performance for Web builds, and establish measurable targets
• Solve low-level technical problems across C++, C#, and JavaScript, such as bringing multithreading to currently single-threaded parts of the runtime
• Partner with teams across Unity that build on the Web platform, translating their needs into platform work
• Mentor teammates and help set code quality standards across the team
• Keep Unity at the frontier of the Webs evolving capabilities

Technologies:

• 3D
• C#
• Emscripten
• Support
• JavaScript
• LLVM
• Unity
• WebAssembly
• Web
• GameDev
• Mobile
• XR

More:

We are hiring a Senior Software Engineer for our Web Platform team. Our platform enables games and real-time 3D content to run in browsers on internet-connected devices. This role focuses on the Unity Web runtime, not website development, and involves deep technical challenges such as multithreading, reducing build size, and improving time to playability. You will work with engineers who helped invent the browser technology we build on and contribute to a new partnership that brings our work to a broad audience. The role is available in Brighton, United Kingdom; Helsinki, Finland; Vilnius, Lithuania; and remotely in the United Kingdom, Finland, or Lithuania. The listed base salary ranges are £55,700–£83,500 (UK Zone A), £63,700–£95,500 (UK Zone B), €62,700–€94,100 (Finland Zone A), and €54,200–€81,400 (Lithuania Zone A), based on primary work location. The role may also be eligible for equity awards and company incentive plans; final compensation depends on location, experience, background, and skills. We offer eligible team members benefits that may vary by country and employment status,

• health, life, and disability insurance
• commute subsidies
• employee stock ownership
• retirement or pension plans
• vacation and personal days
• parental leave and family-care programs
• mental health and wellbeing support
• employee resource groups
• training and development
• volunteering and donation matching

We are committed to fostering an inclusive environment and providing a comfortable, positive interview experience, including accommodations when needed.

We are Unity, a game engine company powering games and 3D experiences across industries including automotive, manufacturing, and healthcare.

last updated 40 week of 2026