Your Mission: Shape the Future of Retail Experiences
At GK – a global leader in retail technology and part of the Fujitsu Group, specializing in checkout, store operations, and customer experience – you’re not here to maintain the status quo — you’re here to disrupt, innovate, and elevate.
We build the SDK-based building blocks that let our partners and customers assemble their own individual apps on top of our platform. As a Senior Mobile Developer, you’ll shape the core components that power a growing ecosystem of partner and customer applications, not just a single app.
What You’ll Do
- Design and develop SDK components and modules for iOS and Android that partners and customers use as building blocks for their own apps
- Define and evolve clean, well-documented public APIs for our SDK, balancing flexibility for partners with simplicity and consistency
- Contribute to and help shape our entire frontend stack, including cross-platform and web technologies
- Work with the native iOS SDK / Android SDK and programming in Swift/Kotlin (Objective-C/Java legacy knowledge a plus)
- Continuously evaluate new technologies, prototype them, and assess their fit for our SDK architecture
- Ensure quality and stability through automated tests, code reviews, and strong engineering practices, treating the SDK as a product partners depend on
- Proactively identify gaps, edge cases, and improvement opportunities rather than waiting to be told what to build
- Collaborate closely in an agile, cross-functional team, taking ownership of technical decisions and contributing ideas beyond your immediate task
What You Bring
- Completed studies in computer science or equivalent qualification, with several years of hands-on experience in Swift and/or Kotlin (Objective-C/Java experience welcome)
- Proven experience building or maintaining an SDK, library, or platform consumed by external developers or partner teams
- You understand API design, versioning, backward compatibility, and developer experience
- Strong know-how in client-server communication, databases, and web services
- Very good knowledge of iOS/Android standard frameworks, APIs, and common design patterns
- A quality-first mindset: comfortable writing automated tests, reviewing code critically, and pushing back on shortcuts that hurt long-term maintainability
- Demonstrated ability to work iteratively and proactively
- Conversational English; German skills advantageous
- Enjoy working in motivated, international, cross-functional teams and mentoring or collaborating closely with partner developers
Why Join GK?
- Mission-driven: We simplify interactions in retail – for businesses and customers alike.
- Empowered by flexibility: Remote-first, flexible hours – work where and how you thrive.
- Security with vision: Permanent contract in a future-focused, stable environment.
- Culture that connects: Open, collaborative, and people-first – with great coffee if you drop by 😉 .
- Backed by strength: With 35+ years of retail tech expertise and as part of Fujitsu, a global IT leader.
- Tech that scales: AI-powered solutions built to grow with the world’s leading retailers.
- Think global: 570,000+ installations in 65+ countries. Real impact, worldwide.