Backend Developer (Kotlin) in Kazakhstan

About the project

Andersen is hiring a Backend Developer (Kotlin) in Kazakhstan to build scalable backend solutions and support international digital projects across multiple industries.

Andersen is a pre-IPO software development company providing a full cycle of services. For over 19 years, we have been helping enterprises and middle-sized firms worldwide transform their businesses by creating effective digital solutions using innovative technologies.

Today, we are working with organizations from various parts of the world, including North America, Western Europe, Israel, Australia, and the UAE. Our expertise covers FinTech, Healthcare, Retail, Telecom, Media & Entertainment, Logistics, Travel & Hospitality, eCommerce, and other industries.

The project is focused on developing a next-generation business banking mobile application based on microservices architecture. It includes building new features, integrating modern technologies, and preparing the migration of corporate clients from the legacy platform to the new solution.

Responsibilities

• Developing and maintaining a microservices architecture.
• Optimizing database performance and queries.
• Configuring monitoring, logging, and alerting.
• Handling deployment and infrastructure management.
• Conducting code reviews, mentoring, and designing architecture from scratch.

Requirements

• Experience in Backend development for 3+ years.
• Strong proficiency in Kotlin and Java, including Kotlin data classes, sealed classes, extension functions, scope functions, Coroutines & Flow (structured concurrency, error handling, Flow operators), as well as Java Collections, Generics, and Stream API.
• Deep understanding of multithreading and JVM internals, including garbage collection, memory model, and performance tuning.
• Extensive hands-on experience with Spring Framework, including Spring Boot (auto-configuration, custom starters, profiles), Dependency Injection / IoC, Spring Data (R2DBC and JPA), Transaction Management, and Spring AOP.
• Advanced knowledge of PostgreSQL and SQL, including query optimization, EXPLAIN ANALYZE, indexing, complex queries, window functions, and CTEs.
• Proven production experience with Kafka, including producers, consumers, partitions, and offsets.
• Strong expertise in REST API design, including versioning, pagination, and error handling.
• Solid practical experience with Docker (optimized images) and advanced Git workflows (rebase, cherry-pick, conflict resolution).
• Hands-on experience with monitoring and observability tools such as Prometheus, Grafana, and Micrometer, including structured logging, correlation IDs, and alerting best practices.
• Strong understanding of microservices architecture, including patterns, anti-patterns, high availability, fault tolerance, and scalability.
• Good knowledge of software design principles, including SOLID, GoF patterns, and DDD basics.
• Experience with testing practices, including unit testing, integration testing, JUnit / Kotest, MockK, and Testcontainers.
• Level of English – from Intermediate+ and above.

Nice to have

• Experience with database migration tools such as Liquibase or Flyway.
• Experience with Java 17+ features, including records, pattern matching, and sealed classes.
• Strong knowledge of Spring WebFlux / Reactive programming, including Mono, Flux, and backpressure principles.
• Experience with Spring Security, including OAuth2 and JWT authentication/authorization flows.
• Understanding of distributed transactions and consistency patterns.
• Practical experience with database scaling, including replication, sharding, and partitioning.
• Hands-on experience with Redis, including caching strategies, pub/sub, and distributed locks.
• Experience with Kubernetes, including deployments, services, ConfigMaps, and Secrets configuration.
• Practical experience building and maintaining CI/CD pipelines using Jenkins, GitLab CI, or GitHub Actions.
• Experience with distributed tracing tools such as Jaeger or Zipkin.
• Knowledge of event-driven architecture principles and patterns.
• Understanding of API lifecycle management.
• Experience with contract testing using Pact or Spring Cloud Contract.
• Experience with Camunda BPM or similar workflow/orchestration platforms.
• Background in fintech or banking systems.

Why join us

• Andersen cooperates with such companies as Siemens, Johnson & Johnson, AstraZeneca, BNP Paribas, Allianz, Ryanair, TUI, Verivox, Media Markt, etc..
• For the past four years, our company has been growing annually by 60–100%, and we constantly involve top-notch specialists in our team.
• Andersen has mentoring and adaptation systems for new employees, and transparent performance review and assessment systems will allow you to determine your development path and plan your growth.
• The most important thing that we value in our employees is a commitment to continuous learning. The company supports them in this and gives them access to the best educational platforms, seminars, and practices. In addition, for over 19 years, Andersen has assembled a huge knowledge base and established a robust resource management institution.
• We have been strengthening our expertise since 2007. During this time, we have formed excellent teams with streamlined processes, where you can learn something new from your colleagues every day and enjoy your work.
• We are a cool young team of like-minded people communicating informally.
• You'll have a stable and competitive salary and an extensive benefits package.
• At Andersen, we have many different ways to grow. You can improve as a specialist or a manager, and all your activities will be decently rewarded.