Kotlin Java Android Developer with German

Android Native Developer (German-speaking)

Location : 100% remote from within the EU

Contract type : B2B

About the company

Kyotu Technology is a boutique software house based in Wrocław and Warsaw, Poland. We partner with clients from Germany, Switzerland, Western Europe, the US, and the Middle East, developing complex, high-impact systems — including those used in finance, identity verification, and cybersecurity.

About the project

We’re building secure digital identity and authorization systems for a German public sector project. The goal is to create modern, secure, and user-friendly Android applications that handle sensitive user data and implement advanced authentication protocols.This is a long-term engagement (2–3 years, with likely extension) in a regulated environment with a strong focus on privacy, cryptography, and compliance.

Your responsibilities

Design and develop native Android applications using Kotlin or Java

Implement authentication and authorization functionality

Develop secure storage and communication modules (e.g. BLE, NFC)

Integrate biometric authentication and secure hardware features

Collaborate closely with UX / UI teams to deliver accessible, intuitive interfaces

Implement testing processes (unit, UI, integration testing)

Participate in code reviews and apply security best practices

Contribute to continuous improvement of the development process

Requirements

Minimum 3 years of experience in native Android development (Kotlin or Java)

Proficiency with Android Studio, Gradle, and ADB

At least 1 year of experience with Material Design and Jetpack Compose

Solid knowledge of native Android APIs, including :

TEE / StrongBox (secure key storage)

BLE (Bluetooth Low Energy)

NFC communication

OMAPI (Open Mobile API)

BiometricPrompt

Experience with testing tools (Espresso, Appium)

Understanding of cryptography and secure communication standards

Familiarity with Git-based development workflows

Proficiency in both German and English (min. B2 level)

✨ Nice to have

Experience with UI design tools (e.g. 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 Google Play

What we offer

100% remote work within the EU (occasional visits to Germany)

Long-term public sector project (2–3 years, strong potential for extension)

Collaborative international team : backend, UX / UI, QA, DevSecOps

Focus on high-impact, security-driven development

️ Note

We are currently building a talent pool for upcoming projects.If you’re interested in joining Kyotu as an Android Native Developer, send us your CV — we’ll contact you when a matching project becomes available.