Kotlin/Java Android Developer with German

B2B | Remote (EU-based) | Full-time | Long-term project | Start: June 2025

We are looking for an experienced Android Native Developer to join our international team working on secure digital identity and authorization systems for a German public sector project. You will help develop modern, secure, and user-friendly Android applications that handle sensitive user data and implement advanced authentication protocols.

This is a long-term engagement in a regulated environment with a strong focus on privacy, cryptography, and compliance. You’ll work as part of a stable, cross-functional team including backend developers, UX/UI designers, QA, and DevSecOps engineers.

Project overview

• Development of secure mobile applications for digital identity management
• Implementation of cryptographic protocols and secure communication features
• Collaboration with a multidisciplinary international team
• Long-term public sector project (2–3 years, with a strong likelihood of extension)
• Remote work from within the EU, with occasional on-site visits in Germany
• Planned start date: June 2025

Responsibilities

• Design and development of native Android applications using Kotlin or Java
• Implementation of authentication and authorization functionality
• Development of secure storage and communication modules (e.g. BLE, NFC)
• Integration of biometric authentication and secure hardware features
• Close collaboration with UX/UI teams to deliver accessible, intuitive interfaces
• Implementation of testing processes including unit, UI, and integration testing
• Participation in code reviews and application of security best practices
• Contribution to the continuous improvement of the development process

Requirements

• Minimum 3 years of experience in native Android development using Kotlin or Java
• Proficiency in Android Studio, Gradle, and ADB
• At least 12 months of experience with Material Design and Jetpack Compose
• Solid knowledge of native Android APIs, including:
• TEE/StrongBox for secure key storage
• BLE (Bluetooth Low Energy)
• NFC communication
• OMAPI (Open Mobile API)
• BiometricPrompt
• Experience with testing tools such as Espresso and Appium
• Understanding of cryptographic techniques and secure communication standards
• Familiarity with Git-based development workflows
• Proficiency in both German and English (minimum B2 level)

Nice to have

• Experience with UI design tools such as Figma
• Familiarity with identity protocols: OAuth2, OpenID Connect, SAML
• Knowledge of FIDO standards and verifiable credentials
• Experience with JWT and digital identity frameworks
• Understanding of eIDAS regulations and compliance requirements
• Previous experience publishing apps to the Google Play Store