Senior Kotlin Backend Developer

Responsibilities:

• Develop and maintain high-load microservices using Kotlin 2.1 and JDK 21.
• Design and implement REST/gRPC APIs with version compatibility.
• Define architectural solutions (DDD, CQRS, Event-driven) and participate in design reviews.
• Integrate with Postgres and ClickHouse via ORM/JDBC/SQL clients, manage connection pools.
• Handle DB schema migrations with Flyway or Liquibase.
• Write and maintain unit/integration tests (JUnit, MockK, TestContainers).
• Profile performance, identify bottlenecks, implement caching (Redis, Caffeine), and optimize queries.
• Configure CI/CD pipelines, support deployment automation, ensure production stability.
• Mentor backend developers and conduct code reviews.

Requirements:

• 5+ years of professional experience with Kotlin/JVM.
• Strong knowledge of the JVM ecosystem, Gradle Kotlin DSL, and garbage collection.
• Proficient in microservice design and inter-service communication (gRPC, HTTP/2).
• Advanced SQL skills, experience with ClickHouse and Postgres optimization.
• Hands-on experience with Flyway or Liquibase in containerized environments.
• Solid testing skills with JUnit5, MockK, and TestContainers.
• Experience with CI/CD tools (GitLab CI, Jenkins, GitHub Actions).
• Mentoring experience and strong communication skills for technical knowledge sharing.

Nice to Have:

• Experience with Spring Boot (WebFlux, Security) or Ktor.
• Knowledge of Docker, Kubernetes, and Helm.
• Familiarity with monitoring and tracing tools (Prometheus, Grafana, Jaeger).
• Experience integrating error tracking systems like Sentry.
• Practical application of DDD and Event Sourcing.