Senior iOS Developer – SDK Specialist

About the role

adjoe is looking for a Senior iOS Developer to own the design, implementation, and maintenance of its native iOS SDKs. You will work on a product that runs on millions of devices daily, turning advertising into a rewarded experience for a global audience.

Key responsibilities

• Develop, ship, and continuously improve native iOS SDKs written in Swift.
• Own end‑to‑end feature development, from specification to production rollout.
• Collaborate with QA to embed automated testing and CI pipelines from day one.
• Monitor performance and memory usage to ensure millisecond‑level initialization on a massive scale.
• Stay up‑to‑date with iOS framework changes and integrate relevant new capabilities.
• Work closely with cross‑platform teams (Kotlin, React Native, Flutter, Unity) to maintain a unified API.

Required profile

• 5+ years of professional iOS development experience.
• Computer Science degree or equivalent practical experience.
• Proven track record of building and maintaining production‑grade SDKs.
• Deep understanding of iOS architecture, SwiftUI, modern concurrency, and service lifecycles.
• Experience writing automated tests and configuring CI pipelines.
• Interest in the ad‑tech ecosystem is a strong plus.

Required skills

• Swift (expert level)
• iOS SDK development
• SwiftUI
• Modern concurrency (async/await)
• Clean architecture principles
• Automated testing frameworks
• CI/CD pipelines
• Kotlin (optional)
• React Native (optional)
• Flutter (optional)
• Unity (optional)
• Go (optional)
• DynamoDB (optional)

What we offer

• Relocation support to Hamburg, Germany.
• Opportunity to impact a product used on 13% of the world’s smartphones.
• Collaborative, high‑performance engineering environment.
• Access to cutting‑edge ad‑tech challenges.