Senior SDK Engineer, Unity Ads (iOS)

The opportunity
We are hiring a Senior SDK Engineer to act as a senior individual contributor on the iOS SDK, owning features or subsystems end-to-end from design through implementation and maintenance.

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 iOS SDK, owning features or subsystems end-to-end from design through implementation and maintenance.
• Contribute to the development and evolution of the iOS SDK architecture within established platform direction and guardrails.
• Implement reliable, performant iOS SDK components with strong attention to threading, lifecycle, and main-thread safety.
• Identify and fix production crashes, performance issues, and regressions, and contribute to improving overall SDK stability.
• Proactively improve existing code, abstractions, and development practices to enhance maintainability and reliability.
• Exercise sound technical judgment in balancing correctness, performance, and delivery timelines.
• Collaborate closely with Android engineers, backend teams, product managers, and QA to ensure consistent SDK behavior and safe integrations.
• Participate in design and code reviews, providing thoughtful feedback and raising engineering quality across the team.

What we're looking for

• 6+ years of professional iOS development experience.
• Strong proficiency in Swift.
• Experience developing iOS SDKs.
• Familiarity with Ads SDKs, monetization platforms, or other performance-sensitive mobile systems.
• Familiarity with cross-platform SDK alignment and shared contracts between iOS and Android.
• Experience with SDK observability, diagnostics, and release processes.
• Knowledge of mobile security and privacy best practices.
• Experience operating in large, mature codebases with a focus on stability and backwards compatibility.

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.

Headhunters and recruitment agencies may not submit resumes/CVs through this Web site or directly to managers. Unity does not accept unsolicited headhunter and agency resumes. Unity will not pay fees to any third-party agency or company that does not have a signed agreement with Unity.

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