Kotlin Integration Engineer
Heirs Technologies
Remote
- Design, build, and maintain event-driven connectors in Kotlin using Quarkus and Apache Camel, following the DSF connector architecture.
- Own connectors end-to-end, including development, integration testing, deployment, observability, and production support.
- Integrate third-party and internal APIs using production-grade security, including OAuth/JWT, request signing, mutual TLS (mTLS), and secure secrets management.
- Implement reliability patterns such as idempotency, retries with backoff, dead-letter handling, message freshness validation, and Kafka consumer group strategies.
- Develop automated unit and integration tests using QuarkusTest, Testcontainers/Kafka Dev Services, and WireMock.
- Build and deploy containerised applications using Docker and CI/CD pipelines while supporting Kubernetes deployment configuration.
- Collaborate with the Plumery engineering team on event catalogue alignment, schema versioning, and messaging standards.
- Work closely with internal platform, API gateway, monitoring, and operations teams to ensure reliable production services.
- Produce and maintain technical documentation, connector specifications, operational runbooks, and support documentation.
- Minimum of 4 years' experience in JVM backend engineering with strong Kotlin development experience (or significant Java experience with demonstrable Kotlin delivery).
- Proven experience working with Apache Kafka in production, including consumer groups, partitioning, offset management, schema handling, and message reliability.
- Experience using Apache Camel or equivalent integration frameworks such as Spring Integration or MuleSoft.
- Hands-on experience building services using Quarkus, Spring Boot, or Micronaut.
- Practical experience implementing API security, including OAuth, JWT, request signing, TLS, truststores, and secure credential management.
- Experience working with Docker and CI/CD pipelines using GitLab CI, GitHub Actions, Jenkins, or similar tools.
- Strong automated testing experience, including integration testing against real brokers and mocked external services.
- Experience integrating with banking or fintech platforms, including Finacle, Flexcube, NIBSS/NIP, SMS/notification gateways, Plumery, Backbase, or Mambu.
- Experience administering or deploying applications on Kubernetes.
- Experience working with Redis for caching or distributed idempotency.
- Familiarity with Kong or other API gateway platforms.
- Experience using Datadog or similar observability and monitoring tools.
- Experience collaborating with vendor engineering teams on multi-country technology programmes.
- Experience working within regulated industries requiring audit trails, secure handling of personal data, and formal change management processes.