Expert FullStack Developer (Java, React)

j-labs software specialistKrakównofluffjobspublished 08/18/2026
Must-have:TypeScriptJavaKotlinReactKubernetesFrontendBackendDevOpsAgileCI/CDTDDAI
Machine translation — original language: Polish.Show original

Join j-labs and support the development of systems that support the optimization of logistics decisions in maritime transport. Currently, 5 main products are being developed to support route planning, fleet management, bookings, peer2peer connections, and transport optimization. The team focuses on developing new services and rebuilding existing systems – including moving towards microservices architecture, using a modern technology stack ( Java 17+/Kotlin, Spring Boot, Kafka , Kubernetes, PostgreSQL ). The team works in a hybrid model, in an international environment . Projects are developed according to the Agile approach, with an emphasis on CI/CD, code quality, and automated testing .​ Work during standard hours.​​

Daily tasks

  • Participation in the full software development life cycle (SDLC): design, architecture, implementation, DevOps.​
  • Programming 50% backend and 50% frontend.
  • Creating and developing systems supporting global maritime transport.​
  • Maintenance of existing systems.​
  • Working in an R&D team on new products and rebuilding existing systems.
  • Participation in on-calls (rotational support), additionally paid. ​

Requirements

Minimum 7 years of experience in programming in Java/Kotlin (Kotlin - nice to have) and TypeScript (React). Practical knowledge of microservices, asynchronous communication, Kafka , PostgreSQL.​ Knowledge of TDD/BDD/DDD principles and tools: JUnit, Mockito, Jasmin, Selenium/Protractor.​ Experience in designing frontend and backend applications.​​ Openness to working with an internal AI tool. Technical education (IT/software engineering). English language – min. B2 level in speaking and writing.

Must have: Java, Spring, TypeScript, React, Kafka, PostgreSQL

Nice to have: Kotlin