The opportunity

We're looking for a Senior Full-Stack Engineer to join the Unity Ads team, with a strong emphasis on backend development. You'll own the backend systems that power our ad experiences, sitting at the core of how ad requests, events, and rendering logic flow between our SDKs, Ad Viewer, and downstream services.

While this is a full-stack role, the majority of your work will be backend focused. You will work closely with the SDK development team and need to understand how client-side SDKs and our Ad Viewer interact with the backend.

What you'll be doing

Act as a senior individual contributor on the Ad Unit team; designing, implementing, and maintaining backend services that handle ad requests and events coming from SDKs and the Ad Viewer.
Implement and evolve business logic that controls how ads are selected, rendered, and tracked.
Build and maintain the backend system that all SDK and Ad Viewer traffic flows through.
Ensure correct communication and data flow between SDKs (iOS, Android, etc.), the Ad Viewer, and downstream systems.
Define and manage the structure of events and requests (e.g., adding/removing fields, updating payload formats).
Ensure events are correctly propagated downstream and remain compatible as the system evolves.
Work closely with the SDK team to align backend behavior with client-side capabilities.
Partner with the Ad Viewer / frontend team (React/JavaScript) to support UI/UX behavior via robust APIs and backend logic.
Act as a bridge between client and server, ensuring end-to-end correctness and performance.
Understand the Ad Viewer front end and how it consumes backend APIs.
Occasionally contribute to frontend logic or integration, while focusing primarily on backend implementation.

What we're looking for

Strong experience building backend services and APIs in a modern language, preferably Go.
Experience working with ad requests, events, or ad rendering logic on the backend.
Familiarity with React and JavaScript, especially in the context of integrating with backend services.
Comfortable reasoning about client–server contracts, but not necessarily a dedicated UI engineer.
Proven ability to work closely with multiple engineering teams (SDK, frontend, backend) and product stakeholders.

Additional information

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

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.

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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Senior Full-Stack Engineer, Unity Ads SDK