Mobile FullStack Developer

j-labs software specialistnofluffjobspublished 08/26/2026
Must-have:JavaKotlinAWSBackendMobileCI/CDMicroservicesAISecurity
Machine translation — original language: Polish.Show original

About the project Development of one of the most popular payment applications, used by millions of users.​ Building and developing modern digital products for the financial and payments sector.​ End-to-end work on functionalities including the mobile application, backend layer, API, and production services (50% backend work / 50% mobile area work). International, English-speaking product-technology team. Close cooperation with the Product Team, Architects, Designers, and the Security team.

Daily tasks

  • Development and maintenance of mobile applications used by end customers.​
  • Implementation of logic shared between mobile platforms.​
  • Creating and developing the backend in Java/Kotlin + Spring Boot.​
  • Cooperation in designing and implementing microservices architecture.​
  • Participation in the development of CI/CD processes, automated tests, and production environments.​
  • Ensuring the performance, quality, scalability, and security of the created solutions.​
  • Utilizing AI tools supporting development, testing, and code maintenance.

Requirements

Very good knowledge of Java / Kotlin and modern mobile architectures.​ Commercial experience in creating production-grade mobile applications.​ Commercial experience in Java and/or Kotlin and Spring Boot.​ Good knowledge of REST API, microservices, and distributed systems.​ Experience with CI/CD, automated testing, and maintenance of production environments.​ Ability to independently deliver functionality from technical design to production deployment.​ Fluent communication in English (min. B2 level). Availability ASAP (max. 1-month notice period).

Must have: Java, Kotlin, Mobile architecture, Spring Boot, REST API, Microservices, CI/CD, Automated testing, Android

Nice to have: Kotlin Multiplatform, AWS, Kafka