Middle Kotlin Backend Developer

REMOTE GLOBAL

We are looking for a Middle Kotlin Backend Developer to join our backend team on a full-time remote basis.

The specialist will develop and maintain server-side applications and APIs using Kotlin, design microservices architecture, manage data persistence and caching, and ensure high performance and reliability of backend systems.

Key responsibilities:

• Develop and maintain backend services and RESTful APIs using Kotlin (Ktor or Spring Boot). • Design and implement microservices architecture with inter-service communication patterns. • Design and optimize database schemas for PostgreSQL/MongoDB and implement caching (Redis). • Integrate message brokers (Kafka, RabbitMQ) for asynchronous and event-driven processing. • Implement authentication/authorization (JWT, OAuth2) and write clean, documented code. • Containerize applications with Docker, orchestrate with Kubernetes, and configure CI/CD. • Write unit and integration tests (JUnit, MockK) and optimize performance. • Collaborate with mobile/frontend teams on API contracts and participate in code reviews.

Requirements:

• 3+ years of commercial backend development with Kotlin. • Strong Kotlin proficiency and hands-on experience with Ktor or Spring Boot. • Solid understanding of REST API design and experience with PostgreSQL/MySQL and ORMs. • Practical experience with Coroutines, Flow, and message brokers (Kafka, RabbitMQ, Redis). • Understanding of microservices, caching strategies, and containerization (Docker, Kubernetes). • Experience with Git, CI/CD tools, and testing frameworks (JUnit, MockK, Kotest). • Basic knowledge of cloud platforms (AWS, GCP, or Azure) and security best practices. • Strong problem-solving skills and ability to work in a distributed team. • English: B2 or higher (written and spoken).

Nice to have:

• Experience with GraphQL, gRPC, or event sourcing/CQRS patterns. • Knowledge of Elasticsearch, serverless computing, or distributed tracing tools. • Experience with other JVM languages (Java, Scala) or data streaming (Kafka Streams, Flink). • Familiarity with search engines, MLOps pipelines, or blockchain backend development. • Contributions to open-source Kotlin or backend projects.