Mobile Application Developer

We are looking for a Mobile Application Developer (Kotlin Multiplatform) to join our team and help build a new mobile product from scratch. The role focuses on developing cross-platform mobile applications for Android and iOS using Kotlin Multiplatform (KMP/KMM) and Jetpack Compose Multiplatform, while maintaining high-quality native user experiences.

The core business logic of the application (including networking, cryptography, and data processing) is implemented in Rust and Go and integrated into the mobile apps through a shared Kotlin layer.

You will work closely with the CTO and co-own the mobile application from early prototype through production, contributing to architecture, UI design, and platform integrations.

Responsibilities

• Develop mobile applications using Kotlin Multiplatform (KMP/KMM) and Compose Multiplatform
• Build and maintain native UI for Android and iOS
• Design and implement app architecture, navigation, and state management
• Integrate mobile platform features (push notifications, biometrics, camera, permissions, keychain/keystore)
• Connect mobile apps to shared Rust and Go libraries via Kotlin
• Optimize app performance, reliability, and usability
• Write and maintain automated tests and contribute to CI/CD pipelines
• Collaborate with product, UX, and engineering stakeholders
• Contribute to engineering standards and best practices

Do you have experience in iOS?, * Professional experience in mobile app development with Android (Kotlin) or iOS (Swift)

• Experience with modern UI frameworks such as Jetpack Compose, SwiftUI, or similar declarative frameworks
• Strong understanding of mobile application architecture, state management, and concurrency
• Experience publishing apps to the Google Play Store and/or Apple App Store
• Knowledge of mobile UX principles and platform-specific design guidelines
• Ability to work independently in a remote-first environment
• Fluent in English and German

Preferred Qualifications

• Hands-on experience with Kotlin Multiplatform (KMP / KMM)
• Experience with cross-platform frameworks such as React Native or Flutter
• Familiarity with native bindings or interoperability (JNI, FFI, C interop, gomobile)
• Basic knowledge of Rust or Go
• Experience in startups, small teams, or greenfield product development

Soft Skills

• Strong problem-solving and analytical skills
• Pragmatic and solution-oriented mindset
• Clear written and verbal communication skills
• Product-focused thinking and user empathy
• Ownership mentality and attention to detail

• Remote-first mobile developer role based in Switzerland or EU-friendly time zones
• Flexible working hours
• Occasional on-site meetings in Switzerland
• Small, experienced engineering team with direct product impact
• Modern tech stack: Kotlin Multiplatform, Compose, Android, iOS, Rust, Go
• Greenfield project with no legacy code
• Competitive salary aligned with the Swiss market
• Opportunity to influence technical and product decisions