Mid-Level Kotlin Developer

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 KotlinCollaborating with cross-functional teams to deliver solutions across Platform, Services, SMB, and other domainsSupporting system performance monitoring and contributing to improvements in reliability and scalabilityParticipating in code reviews and maintaining high code quality standardsContributing to the continuous improvement of code quality and system architectureTroubleshooting and resolving technical issues Requirements Minimum 3 years of professional experience in software developmentHands-on experience with Kotlin in commercial projectsExperience building backend systems and working with microservices architectureBasic 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 EnglishResiding in Poland required Job no. JOB-R7LMQ Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws. Benefits For You Great Place to WorkSolid financial situationContracts with the biggest brandsCentre of internal trainingsMany experts you can learn fromOpen and accessible management teamProfit sharingPassion Sponsorship programRegular integration events and tripsComfortable and well-equipped officesMySii appMedical care