Sii Poland

kotlin developer in fintech

In short

This role is building and maintaining Kotlin-based microservices for a fintech platform that handles company expense management, payment cards, and invoice processing integrated with banks and accounting systems. The company is Sii Poland, working across Platform, Services, and SMB domains, requiring at least 3 years of backend development experience with microservices, basic cloud (AWS/Kubernetes) exposure, PostgreSQL, and testing/observability tools like JUnit and Grafana. The role is remote but requires residing in Poland and good English.

About the Role
The team works on a modern fintech platform for company expense management. The finance solution integrates payment cards, expense management, and invoice handling into partner systems such as banks, accounting platforms, and HR solutions, helping companies simplify financial processes, automate settlements, and monitor spending in real time.
Responsibilities
•Design, build, and maintain microservices using Kotlin
•Collaborate with cross-functional teams to deliver solutions across Platform, Services, SMB, and other domains
•Support system performance monitoring and contribute to reliability and scalability improvements
•Participate in code reviews and maintain high code quality standards
•Contribute to improving code quality and system architecture
•Troubleshoot and resolve technical issues
Requirements
•At least 3 years of professional software development experience
•Hands-on Kotlin experience in commercial projects
•Experience building backend systems and working with microservices architecture
•Basic experience with cloud environments such as AWS or Kubernetes
•Experience with relational databases such as PostgreSQL, and with testing and observability tools such as JUnit and Grafana
•Good command of English
•Residing in Poland is required
Conditions
•Profit sharing
•Passion Sponsorship program
•Regular integration events and trips
•Comfortable, well-equipped offices
•Medical care

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