GK Software

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.

Android

Swift

Java

Kotlin

Testing

Operations

Customer Care

Database

Wireframing/prototyping

Web Development

Security software

Design Architecture

Agile

Communications

System security

Objective-C

Automated Tests

Code Review

Multi platform

Front-End

Version control

Design Patterns

Senior Mobile Developer (iOS/Android) - SDK & Platform (all genders)