Kotlin + Python Developer

Job Description We are looking for a Kotlin + Python Developer to join a long-term project in the banking sector. The role involves developing and maintaining applications in a microservices architecture, working with both Kotlin and Python (50/50), and supporting innovative solutions in the credit decision area. Responsibilities: Develop and maintain banking software, starting with credit decision projects. Design and implement new features in a microservices architecture (Kotlin + Python, ~50/50). Support PoC initiatives and propose innovative solutions. Ensure code quality, documentation, testing and troubleshooting. Collaborate with team members and business stakeholders. Requirements Degree in Computer Science or related field. 2–4 years of commercial experience with Java/Kotlin (Java 17+, Kotlin 1.9). Strong Python (3.13) and Selenium experience. Experience with Spring and Hibernate frameworks. Swagger/OpenAPI knowledge. Experience with multithreaded programming. Tools: IntelliJ, Git, Maven/Gradle, Jira. Database skills: PostgreSQL, Oracle, MongoDB, CouchDB. Solid background in microservices architecture and RESTful Web Services. Ability to build applications with Gradle. Docker (image building). ISTQB Foundation certificate or willingness to obtain. Domain knowledge in finance/investments. Polish: fluent working proficiency. Nice to have: English skills for reading/writing technical documentation. Knowledge of reactive programming (Spring WebFlux). Benefits Solid, competitive salary. Work in multilingual, multinational and multicultural environment on international projects. Comprehensive healthcare. Long-term B2B contract with stable project pipeline. Flexible hybrid model (3 days/week on-site in Warsaw)