Senior Scala + Java Engineer

N-iX is looking for a Senior Scala + Java Engineer to join a leading European online car marketplace with over 30 million monthly users across 18 countries. In this role, you will work on high-load, distributed systems, helping to build scalable, event-driven backend services that power a product used by millions of users daily. You will have a direct impact on system architecture, performance, and reliability, while working with modern technologies and functional programming principles.

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 with Scala and Java (strong focus on Scala).
• Solid experience with Spring Boot.
• Hands-on experience with event-driven architecture (Kafka).
• Strong knowledge of the Typelevel ecosystem.
• Deep understanding of:
  • Functional programming principles;
  • Effect systems (Cats Effect);
  • 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.
• Background in fintech or high-integrity domains.
• Contributions to open source projects.
   

We offer*:

• Flexible working format - remote, office-based or flexible
• A competitive salary and good compensation package
• Personalized career growth
• Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
• Active tech communities with regular knowledge sharing
• Education reimbursement
• Memorable anniversary presents
• Corporate events and team buildings
• Other location-specific benefits

*not applicable for freelancers