Senior Software Engineer, Web Platform

Unity; Greater London; On-site; GBP 62,000 - 93,000; Full time

Benefits offered by this job

Health insurance

Commuter subsidy

Employee stock ownership

Retirement plans

Generous vacation

Parental leave support

Office snacks

Mental health programs

ERGs

Training and development

Volunteering program

Job summary

Unity's Web Platform team is hiring a Senior Software Engineer to shape the architecture of the Web runtime embedded in browsers. This role focuses on deep, native work rather than general website development, helping decide where the platform goes next.

You will own technical direction, tackle complex root-cause analysis, and drive performance optimizations like code stripping, progressive asset loading, and multi-threading. Mentoring across the team and clear guidance to leaders are expected.

Qualifications

• Expert level C++ in low-level, performance sensitive code.
• Substantial development experience with WebAssembly, using Emscripten and/or LLVM.
• A proven track record of owning architecture for a platform or runtime and validating it against real customer needs.
• Ability to run deep root cause analysis on complex, multidimensional problems.
• Ability to work independently, prioritizing against long-term platform goals.
• Effective written/verbal communication that boils deep technical detail down for teams outside your own.
• A proven track record of mentoring engineers and raising the technical bar across a team.

Responsibilities

• Help own the technical direction and architecture of the Unity Web platform.
• Resolve complex, multidimensional problems in the runtime with deep root cause analysis.
• Research, design and implement optimizations like code stripping, progressive asset loading and multi-threading.
• Prioritize and complete your own portfolio of platform work with your manager.
• Act as first line of support for teams across Unity and partners needing core Web platform work.
• Mentor engineers across the team and set the bar for code quality.
• Translate technical trade-offs into clear recommendations for Unity leadership.

Skills

C++ expert

WebAssembly

Architecture ownership

Root cause analysis

Independent work

Communication

Mentoring engineers

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. The platform is going through the biggest change in its history: browser capability has advanced, browser gaming is reviving, and an exciting new partnership with a major platform has put the Web runtime at the center of Unity's plans. We are looking for a senior engineer to help decide where it goes next.

This is a meaningful role for someone who wants to shape architecture, not just implement it. You will help own the technical direction of the Web platform, take on the problems nobody else has solved, and set the standard other engineers work to. This is not website development. We embed Unity inside the browser, and the work is deep and native. You will join engineers who helped invent the browser technology we build on, and you will be the person other teams across Unity come to when they need something from the core platform.

What you'll be doing

• Help own the technical direction and architecture of the Unity Web platform

• Resolve complex, multidimensional problems in the runtime, running deep root cause analysis and validating the fix against what developers actually need

• Research, design and implement the optimizations that define what a Unity Web build can be, including code stripping, progressive asset loading and multi-threading

• Prioritize and complete your own portfolio of platform work, agreeing the shape of it with your manager

• Act as the first line of support for teams across Unity, and for partners, who need something from the core Web platform

• Mentor engineers across the team and set the bar for code quality

• Translate technical trade-offs into clear, concise recommendations for leaders across Unity

What we're looking for

• Expert level C++ in low-level, performance sensitive code

• Substantial development experience with WebAssembly, using Emscripten and/or LLVM

• A proven track record of owning architecture for a platform or runtime and validating it against real customer needs

• Ability to run deep root cause analysis on complex, multidimensional problems

• Ability to work independently, prioritizing against long-term platform goals

• Effective written/verbal communication that boils deep technical detail down for teams outside your own

• A proven track record of mentoring engineers and raising the technical bar across a team

You might also have

• Experience working on the internals of a browser engine

• Deeper domain knowledge of rendering, physics or audio in a real-time 3D engine

• Familiarity with compression methodologies and code size optimization at scale

Base Salary Range: We determine the base salary range for this role based on your primary work location:

Zone A: €73,000 - €109,400 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.

• 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.