Principal SDK Engineer San Francisco, CA

Senior SDK Engineer, Unity Ads (Frontend)

San Francisco, CA, USA, Full-time

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We are hiring a Senior SDK Engineer to join as a senior individual contributor on the Ad Unit team. You will own the frontend implementation of ad units and formats, delivering polished, interactive UI/UX experiences from design through production.

This is a chance to work at the exciting intersection of SDK development, machine learning, and data infrastructure. Join us to create innovative solutions that propel advertising technology forward, impacting billions of global ad experiences while ensuring privacy and compliance.

What you'll be doing

• Act as a senior individual contributor on the Ad Unit team, owning the frontend implementation of ad units and formats, delivering polished, interactive UI/UX experiences from design through production.

• Design, implement, and iterate on interactive ad experiences, including UI, layout, animation, and user interaction flows.

• Translate product and design concepts into high-quality, performant frontend implementations.

• Own and drive improvements in the rendering and presentation layer of ad units, ensuring correctness, visual polish, and consistent behavior across devices.

• Optimize frontend performance to ensure smooth animations, responsive interactions, and minimal rendering overhead.

• Identify and resolve frontend bugs, rendering issues, and UX regressions in production.

• Proactively improve frontend architecture, component reuse, and development practices to support rapid iteration and maintainability.

• Exercise sound technical judgment when balancing UI/UX quality, performance, complexity, and delivery timelines.

• Collaborate closely with product managers, designers, backend engineers, and mobile SDK teams to ensure ad formats are technically feasible and well-integrated.

• Participate actively in design and code reviews, raising the bar for frontend engineering quality across the team.

What we're looking for

• Experience working on Ads platforms, ad rendering systems, or monetization-related products.

• Familiarity with animation frameworks (e.g., CSS animations, Web Animations API, canvas, or WebGL).

• Experience building highly dynamic or data-driven UI flows, including experimentation or feature-gated behavior.

• Experience collaborating closely with designers on interaction design, motion, and visual polish.

• Familiarity with A/B testing or experimentation frameworks and iterating on UI based on metrics.

• Experience working with mobile webviews or embedded rendering environments.

• Understanding of accessibility best practices and inclusive UI design.

• Experience operating in large, mature codebases with a focus on maintainability and stability.

Additional information

• Relocation support is not available for this position.

Life at Unity

Unity 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.…