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 being developed allows companies to simplify financial processes, automate settlements, and gain full real-time control over their spending.Your tasksLeading initiatives to design, build, and maintain scalable microservices primarily using KotlinCollaborating with cross-functional teams to develop innovative solutions across Platform, Services, SMB, and other domainsAnalyzing system performance and implementing optimizations to ensure high reliability and scalabilityParticipating in code reviews, post-mortems, and providing mentorship to other engineersProactively addressing technical debt and guiding the team through technical challenges and migrationsRequirementsMinimum 5 years of professional experience in software developmentExpertise in server-side languages, especially Kotlin, and experience with distributed systems, microservices, and cloud environments (e.g., AWS, Kubernetes)Proficiency with relational databases like PostgreSQL, testing frameworks (e.g., JUnit, Testcontainers), and observability tools like GrafanaStrong problem-solving skills and a collaborative mindset to mentor and upskill your teammatesVery good knowledge of English - min. B2 levelFluent Polish requiredResiding in Poland requiredNice-to-have requirementsPrevious work in the fintech industry or with financial productsKnowledge of topics related to payments, cards, or accountingExperience working in a scale-up environment