Kotlin + Python Developer

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)