Senior Kotlin Engineer (Backend)

TL;DR

Senior Kotlin Engineer (Backend): Building and evolving backend services for player account management and authentication with an accent on secure API design, regulatory compliance, and microservices architecture. Focus on maintaining production reliability, integrating third-party verification systems, and ensuring high performance across a multi-tenant platform.

Location: Based in Hamburg, Germany (Hybrid role).

Company

A leading international provider of online lottery experiences and digital products based in Germany.

What you will do

• Design and maintain backend services powering player account lifecycles and identity verification.
• Develop authentication and authorization systems for a multi-tenant environment.
• Integrate third-party regulatory platforms to ensure compliance and user safety.
• Collaborate with cross-functional teams including frontend, QA, and compliance experts.
• Drive API design decisions and support production operations to ensure reliability and performance.
• Participate in technical discussions to foster engineering quality and innovation.

Requirements

• Professional experience in backend development with Kotlin or JVM languages.
• Solid understanding of API design and building microservices.
• Experience with PostgreSQL, MongoDB, and Kafka.
• Knowledge of security patterns like OAuth2 and OpenID Connect.
• Familiarity with containerization (Docker, Kubernetes) and AWS.
• Strong communication skills in English.

Nice to have

• Experience with Go for services or tooling.
• Background in regulated digital products or e-commerce.
• Exposure to identity management or KYC processes.
• Frontend experience with Angular.

Culture & Benefits

• Hybrid work model with a result-oriented environment.
• Unlimited vacation days plus a base 30-day allowance.
• Annual personal development budget of €1,500.
• Company pension scheme and mobility allowance.
• Access to gym facilities via EGYM WELLPASS.
• Company-provided lunches four days a week and team activities.