Senior Mobile SDK Engineer – iOS/Android

GK Software; Germany (OH); On-site; USD 102,645 - 136,861; Full time

Benefits offered by this job

Remote-first

Flexible hours

Permanent contract

International team

Great coffee

Job summary

GK Software, a global leader in retail technology, is seeking a Senior Mobile Developer to design SDK components for iOS and Android and help shape a growing ecosystem of external apps. You’ll work with Swift/Kotlin, collaborate in an agile, international team, and contribute to the frontend stack and API design.

Remote-first with flexible hours and a permanent contract. The role emphasizes quality, automated tests, and mentorship, delivering robust SDKs used by partners and customers worldwide.

Qualifications

• Degree in computer science or equivalent with hands-on Swift/Kotlin.
• Experience building or maintaining an SDK, library, or platform for external developers.
• Strong API design, versioning, backward compatibility, and developer UX.

Responsibilities

• 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.
• 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.
• Proactively identify gaps, edge cases, and improvement opportunities.
• Collaborate closely in an agile, cross‑functional team, taking ownership of technical decisions.

Skills

Swift

Kotlin

API design

Automated testing

Client-server communication

Design patterns

English communication

Mentoring

Education

Computer science degree

Tools

iOS SDK

Android SDK

Job description

GK Software, a global leader in retail technology, is seeking a Senior Mobile Developer to design SDK components for iOS and Android and help shape a growing ecosystem of external apps. You’ll work with Swift/Kotlin, collaborate in an agile, international team, and contribute to the frontend stack and API design.

Remote-first with flexible hours and a permanent contract. The role emphasizes quality, automated tests, and mentorship, delivering robust SDKs used by partners and customers worldwide.