Senior iOS Developer (f/m/d) at adjoe

Hamburg, Germany

true · full_time · Visa sponsorship

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Responsibilities:
- Design, develop and maintain production-grade native iOS SDKs in Swift optimized for fast initialization and minimal binary overhead.
- Own end-to-end feature delivery: spec implementation, API design, testing, and rollout.
- Identify and handle platform edge cases at scale (memory, lifecycle, concurrency) and optimize performance.
- Build testability into the SDK, author automated tests and integrate them into CI pipelines.
- Collaborate with backend, cross-platform and mobile teams to ensure consistent APIs and integrations (Unity/Flutter/React Native wrappers).
- Keep the SDK up-to-date with iOS framework changes and propose/implement improvements.
- Mentor peers and contribute to architecture and quality discussions.

Requirements:
- 5+ years iOS development experience and a CS degree or equivalent practical experience.
- Proven experience building and maintaining production SDKs used by large user bases.
- Deep knowledge of Swift, SwiftUI, modern concurrency, iOS lifecycles and clean architecture principles.
- Strong skills in performance tuning, memory footprint reduction, and binary size optimization.
- Experience with automated testing, CI systems and observability for mobile code.
- Cross-platform exposure (Kotlin, React Native, Flutter, Unity) and AdTech experience are strong pluses.
- Willingness to relocate to Hamburg supported by company relocation assistance.