Senior Java Engineer (#5025)

Our client is a leading European online car marketplace with over 30 million monthly users and a presence in 18 countries. As a Senior Java Engineer, you will play a pivotal role in shaping the future of online car markets, contributing to the platform’s scalability, reliability, and overall user experience for millions of car buyers and sellers across Europe.

Responsibilities:

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

Requirements:

• 5+ years of backend development experience in Java.
• Strong knowledge of Spring Boot.
• Hands-on experience with event-driven architectures, preferably Kafka.
• Practical experience with the Typelevel ecosystem (Cats, Cats Effect, FS2, Http4s).
• Deep understanding of:
  • Effect systems (Cats Effect);
  • Functional programming principles;
  • Type classes and higher-kinded types;
  • Pure vs impure boundaries.
• Experience building distributed systems.
• Strong understanding of concurrency and asynchronous programming.
• Upper-Intermediate English or higher for technical communication.

Nice to Have:

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