Regular Kotlin Developer (f/m/x)

Join a team working on a modern fintech platform that supports company expense management.

The project focuses on developing a finance solution that enables seamless integration of financial tools (including payment cards, expense management, and invoice handling) directly into partner systems such as banks, accounting platforms, and HR solutions. The product allows companies to simplify financial processes, automate settlements, and gain full real-time control over their spending.

Your tasks

• Designing, building, and maintaining microservices using Kotlin

• Collaborating with cross-functional teams to deliver solutions across Platform, Services, SMB, and other domains

• Supporting system performance monitoring and contributing to improvements in reliability and scalability

• Participating in code reviews and maintaining high code quality standards

• Contributing to the continuous improvement of code quality and system architecture

• Troubleshooting and resolving technical issues

Requirements

• Minimum 3 years of professional experience in software development

• Hands-on experience with Kotlin in commercial projects

• Experience building backend systems and working with microservices architecture

• Basic experience with cloud environments (e.g., AWS, Kubernetes)

• Experience with relational databases (e.g., PostgreSQL) as well as testing and observability tools (e.g., JUnit, Grafana)

• Good command of English

• Residing in Poland required

What we offer 

• Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas 

• Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market 

• We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 

• Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more 

• Comfortable workplace – class A offices or remote work 

• Dozens of fascinating projects for prestigious brands from all over the world 

• PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers 

• Investment in your growth – meetups, webinars, training platform and technology blog – you choose 

• Fantastic atmosphere created by all Sii Power People 

If you want to work on systems with high operational significance — apply now!