Join a multidisciplinary team shaping the future of secure digital identity in Europe. You’ll play a key role in designing and building the backend architecture of a high-trust digital wallet solution used across regulated, privacy-sensitive domains.
Key Responsibilities:
* Contribute to the architecture and implementation of the wallet’s backend services, including: Remote trust anchor (Cloud HSM) integration, Wallet and Credential lifecycle, Vulnerability management, System telemetry and statistics
* Design and implement secure, scalable, and reliable backend components, focusing on quality and resilience.
* Develop and maintain test suites across system levels, including functional, load, and performance testing.
* Evaluate and evolve existing components, replacing or refining them where needed to meet new security and scalability requirements.
* Collaborate closely with mobile/backend developers, security engineers, and architects in an agile, international team, working across German and EU government bodies and supporting organizations.
* Contribute to concise and clear technical documentation for internal processes, certification efforts, and public specifications.
What we’re looking for:
* Proven ability to deliver value in high-stakes, regulated environments, with a strong focus on backend systems that prioritize security, scalability, and compliance
* 10+ years of backend development experience, including 3+ years of Kotlin, designing and building robust, scalable, and secure REST APIs
* Deep knowledge of modern cryptography, secure protocol implementation, and identity management standards (e.g., OAuth2, OpenID Connect, Verifiable Credentials)
* Strong security mindset with hands-on experience building and reviewing security-sensitive applications, conducting threat modeling, and mitigating common web/API vulnerabilities
* Skilled in relational database design and SQL query optimization, ensuring performance and reliability under high load and complex transactional scenarios
* Experienced with scalability planning, load testing, and backend analytics, enabling insight-driven performance tuning and operational resilience
* Active contributor to the open source communities, including leadership in public technical discussions, issue triage, and contribution to standardization efforts
* Comfortable working in DevOps environments, collaborating closely with ops teams to improve infrastructure, deployment pipelines, and observability across environments
* Excellent communicator, able to bridge the gap between technical depth and practical decision-making, whether through design docs, code, or team discussions
Bonus Skills:
* Experience with Digital Credentials / OpenID / OAuth / Verifiable Credentials
* Knowledge of Hardware Security Modules (HSMs) and cryptographic key management
* Familiarity with device attestation mechanisms like Play Integrity and iOS DeviceCheck
* Hands-on experience with DevOps, CI/CD pipelines, and cloud-native operations
Benefits:
* Competitive salary
* Flexible working hours and remote work options.
* Access to conferences, team events, and a supportive work culture.
Sounds good? Send me your CV