Senior Engine Integration Engineer

The opportunity
The team that brought Unity to visionOS and enabled real-time interaction via Play-to-Device is growing in preparation for something even more ambitious: adapting PolySpatial to stream Unity content into other game engines and 3D environments—in-process, cross-process, and over the network.

We're looking for engineers eager to help us invent how different real-time 3D runtimes communicate and render under real-world constraints. You’ll work at the intersection of core engine tech, high-performance networking, distributed systems, and graphics. This is your opportunity to build the fundamental infrastructure for the next generation of interconnected game and 3D ecosystems.

You're our in-house expert for the "other side". We're not porting a game—we're integrating engines themselves. Your deep expertise in another AAA engine will help us reconcile diverging lifecycles, serialization models, networking metaphors, and resource management so both can stay in sync. This role blends hands-on engine coding, plugin/middleware development, and cross-company collaboration. If wiring two full game engines into one coherent system sounds compelling, this is your chance.

What you'll be doing

• Serve as subject matter expert on Unreal architecture and best practices, especially networking, serialization, resource management, and lifecycles.
• Act as liaison between Unity and game engine partners, bridging technical concepts and architectural philosophies.
• Design subsystems that map Unity features to Unreal equivalents (and vice versa) to synchronize content at scale.
• Debug complex cross-engine interactions: crashes, race conditions, resource contention, and feature "impedance mismatches".

What we're looking for

• Unreal Mastery: Extensive knowledge of Unreal source code, resource management, UObject lifecycle, and Slate UI
• Integration Experience: You've written plugins or middleware that deeply modify or extend Unreal's core functionality
• Networking Knowledge: Strong understanding of Unreal's replication model, authority handling, and synchronization toolbox
• Unity Familiarity: Sufficient Unity experience to map concepts between engines, especially where abstractions clash.

You might also have

• Background shipping games or middleware across multiple engines
• Experience porting games between engines, including the asset conversions and build pipeline work.
• Knowledge of FBX, USD, glTF, or similar interchange formats
• Experience modifying game engine source code for custom builds or specialized features.

Additional information

• Relocation support is not available for this position
• Work visa/immigration sponsorship is not available for this position

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
We offer a wide range of benefits designed to support employees' well-being and work-life balance. You can read more about them on our career page.

Unity [NYSE: U] is the leading platform to create and grow games and interactive experiences. Creators, ranging from game developers to artists, architects, automotive designers, infrastructure experts, filmmakers, and more, use Unity to bring their imaginations to life across multiple platforms, from mobile, PC, and console, to spatial computing.

As of the third quarter of 2024, more than 70% of the top 1,000 mobile games were made with Unity, and in 2024, Made with Unity applications had an average of 3.7 billion downloads per month. For more information, please visit Unity.

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.

Pursuant to the San Francisco Fair Chance Ordinance, we will consider for employment qualified applicants with arrest and conviction records.

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.

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