Kotlin + Python Developer
Madiff.com
Office
Warsaw, Poland
Full Time
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:
Nice to have:
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)
Kotlin + Python Developer
Office
Warsaw, Poland
Full Time
September 20, 2025