Senior Java Engineer (#5061)

Our client is a leading European online car marketplace, reaching over 30 million users per month across 18 countries. As a Senior Java Engineer, you will play a key role in shaping the future of online car trading and enhancing the experience for millions of buyers and sellers.

Responsibilities:

• Design and implement scalable backend services in Java;
• Model complex business domains using strong type systems;
• Build and maintain event-driven and distributed systems;
• Contribute to architectural decisions around concurrency, streaming, and data consistency;
• Write clean, testable, and maintainable code;
• Improve CI/CD pipelines, observability, and system reliability;
• Collaborate closely with product and platform teams.

Requirements:

• 4+ years of backend development experience in Java;
• Experience with Java Spring Boot;
• Familiarity with event-driven architectures (Kafka);
• Deep understanding of effect systems (Cats Effect), functional programming principles, type classes, higher-kinded types, pure vs impure boundaries;
• Experience building distributed systems;
• Strong understanding of concurrency and asynchronous programming;
• Upper-intermediate English or higher.

Nice to Have:

• Experience with Scala 3;
• Experience with PHP;
• Knowledge of tagless-final patterns;
• Experience in fintech or high-integrity domains;
• Contribution to open-source projects.