Kotlin + Python Developer

Madiff; Warszawa; On-site; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Flexible hybrid model

Long-term B2B contract

Job summary

A leading software development company in Warsaw is seeking a Kotlin + Python Developer to engage in a long-term banking project. You will work on developing and maintaining applications with a focus on innovative credit decision solutions. The ideal candidate has experience in Kotlin and Python, with a strong understanding of microservices architecture and fluent Polish. This position offers a flexible hybrid working model.

Qualifications

• 2–4 years of commercial experience with Java/Kotlin.
• Strong experience in Python and Selenium.
• Solid background in microservices architecture.
• Experience with Spring and Hibernate frameworks.
• Swagger/OpenAPI knowledge.
• Experience with multithreaded programming.
• 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.

Responsibilities

• Develop and maintain banking software for credit decision projects.
• Design and implement features in a microservices architecture.
• Ensure code quality, documentation, and testing.
• Ensure code quality, documentation, testing and troubleshooting.
• Collaborate with team members and business stakeholders.

Skills

Kotlin

Python

Java

Selenium

IntelliJ

Git

Multithreading

Gradle

Jira

Education

Degree in Computer Science or related field

Tools

Maven

Gradle

Jira

Docker

Job description

Overview

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.
• 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).
• Work in multilingual, multinational and multicultural environments on international projects.
• Long-term B2B contract with stable project pipeline.
• Flexible hybrid model (3 days/week on-site in Warsaw).