Senior Software Engineer, Web Platform

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

The opportunity

We are hiring for a Senior Software Engineer to join our Web Platform team here at Unity. Unity’s Web platform lets games and real-time 3D content run in a browser, on any internet connected device. Browser capability has moved fast, browser gaming is going through a revival, and the Unity Web runtime is what makes it possible. Our work also supports an exciting new partnership with a major platform, which puts what this team builds in front of audiences at a scale few browser platforms reach.

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.

What you’ll be doing

• 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

What we’re looking for

• Deep, hands-on proficiency with C++ in performance sensitive code
• Development experience with WebAssembly, using Emscripten and/or LLVM
• Ability to decompose complex technical problems and complete them on your own technical judgment
• Experience profiling, debugging and optimizing across the native and browser boundary
• Working knowledge of C# and JavaScript
• Effective written/verbal communication with peers, managers and key decision makers in other teams
• A proven track record of mentoring engineers and raising code quality standards

You might also have

• Experience contributing to a browser engine or browser runtime
• Deeper domain knowledge of rendering, physics or audio in a real-time 3D engine
• Familiarity with compression methodologies and build size reduction

United Kingdom Base Salary Range: We determine the base salary range for this role based on your primary work location:
Zone A: £55,700 - £83,500 GBP gross

Zone B: £63,700 - £95,500 GBP gross

Finland Base Salary Range: We determine the base salary range for this role based on your primary work location:
Zone A: €62,700 - €94,100 EUR gross

Lithuania Base Salary Range: We determine the base salary range for this role based on your primary work location:
Zone A: €54,200 - €81,400 EUR gross

This range reflects the anticipated base salary for this position. Beyond base salary, this role may be eligible for equity awards and participation in our company incentive plans (such as annual discretionary bonuses or sales commissions). The final offer amount will depend on several factors, including geographic location and the candidate’s relevant experience, professional background, and skill set.

Benefits

At Unity, we want our team members to thrive. We offer a wide range of benefits designed to support well-being and work-life balance.

Please note: Benefits eligibility, specific offerings, and coverage vary based on the country and employment status.

While specific benefits vary, here are some of the ways we strive to take care of our eligible team members globally: Comprehensive health, life, and disability insurance | Commute subsidy | Employee stock ownership | Competitive retirement/pension plans | Generous vacation and personal days | Support for new parents through leave and family-care programs | Office food snacks | Mental Health and Wellbeing programs and support | Employee Resource Groups | Global Employee Assistance Program | Training and development programs | Volunteering and donation matching program

Life at Unity

Unity [NYSE: U] is the world’s leading game engine, powering play for more than 3 billion consumers each month. The top mobile games in the world, the most played PC indie titles, the most innovative console games, and virtually all of the top XR and Web Games are developed, deployed, and grown in Unity. Unity also enables teams across industries like automotive, manufacturing, and healthcare to design, simulate, and collaborate in 3D — closing the gap between ideas and reality. For more information, please visit www.unity.com.

Unity is a proud equal opportunity employer. We are committed to fostering an inclusive, innovative environment and celebrate our employees across age, race, color, ancestry, national origin, religion, disability, sex, gender identity or expression, sexual orientation, or any other protected status in accordance with applicable law. Our differences are strengths that enable us to support the growing and evolving needs of our customers, partners, and collaborators. If you have a disability that means there are preparations or accommodations we can make to help ensure you have a comfortable and positive interview experience, please fill out this form to let us know.

_This position requires the incumbent to have a sufficient knowledge of English to have professional verbal and written exchanges in this language since the performance of the duties related to this position requires frequent and regular communication with colleagues and partners located worldwide and whose common language is English.

This posting is intended to fill an existing vacancy, and we are committed to providing applicants with updates throughout the hiring process in accordance with applicable law.

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