Senior Kotlin Backend Developer

We're looking for a Senior Kotlin Backend Developer to join an international team building scalable backend solutions. You'll take ownership of features from design to production, contribute to architectural decisions, mentor teammates, and communicate directly with the client in English.
 

Requirements

• 5+ years of backend development experience
• Strong commercial experience with Kotlin
• Solid understanding of JVM fundamentals (concurrency, memory management, garbage collection)
• Experience with Spring Boot (or Ktor / Micronaut)
• Strong knowledge of REST API design
• Experience with relational and/or NoSQL databases (PostgreSQL, MySQL, MongoDB, etc.)
• Hands-on experience with ORM frameworks such as JPA, Hibernate, or Exposed
• Experience writing unit and integration tests using JUnit and MockK
• Good understanding of Clean Architecture, SOLID principles, Git, CI/CD, and code review practices
• Experience with AI-assisted development tools such as GitHub Copilot, Cursor, Claude, or similar
• Upper-Intermediate or higher English (direct communication with clients)
   

Responsibilities

• Design, develop, and maintain backend services using Kotlin
• Own features end-to-end, from technical discussions to production deployment
• Build clean, maintainable, and well-tested code
• Participate in architecture and system design decisions
• Review code and mentor other engineers
• Collaborate directly with clients and cross-functional teams
• Continuously improve development processes and engineering quality
   

Nice to Have

• Experience with microservices architecture
• Docker and Kubernetes
• Cloud platforms (AWS, GCP, or Azure)
• Messaging systems (Kafka, RabbitMQ)
• Redis or other caching technologies