Senior Kotlin Software Engineer

<p class="isSelectedEnd">N-iX is looking for a <strong>Senior Kotlin Software Engineer</strong>&nbsp;to join a new engagement with a leading European fintech company. This is an exciting opportunity to become part of a modern engineering organization that is redefining how businesses manage corporate spending through innovative financial technology solutions.</p> <p class="isSelectedEnd">The company is building an AI-native engineering environment where developers leverage cutting-edge AI tools throughout the software development lifecycle. You'll work within cross-functional product squads, contributing to both existing platforms and new product initiatives while helping shape scalable, data-driven backend services.</p> <h2>Responsibilities:</h2> <ul data-spread="false"> <li>Design and develop scalable backend services using Kotlin.</li> <li>Build and own clean API layers serving both internal and customer-facing products.</li> <li>Work at the intersection of backend engineering and data platforms, integrating analytical data into product experiences.</li> <li>Develop solutions leveraging BigQuery and OLAP serving layers.</li> <li>Collaborate closely with cross-functional engineering teams in an agile environment.</li> <li>Apply AI-assisted development practices using modern engineering tools.</li> <li>Contribute to high-quality, maintainable, and scalable software architecture.</li> </ul> <h2>Requirements:</h2> <ul data-spread="false"> <li>Strong commercial experience with Kotlin.</li> <li>Hands-on experience with BigQuery in production environments.</li> <li>Experience working with OLAP serving layers and analytical query systems.</li> <li>Experience with AI-assisted development tools such as GitHub Copilot or Claude Code.</li> <li>Solid background in backend architecture and API design.</li> <li>Experience building production-grade distributed systems.</li> <li>Strong understanding of modern software engineering best practices.</li> <li>Professional level of English.</li> <li>Currently based in the European Union.</li> </ul> <h2>Nice to have:</h2> <ul data-spread="false"> <li>Java experience.</li> <li>PostgreSQL.</li> <li>AWS and/or GCP.</li> <li>Experience with REST and/or gRPC APIs.</li> </ul><div class="content-conclusion"><p><strong>We offer*:</strong></p> <ul> <li>Flexible working format - remote, office-based or flexible</li> <li>A competitive salary and good compensation package</li> <li>Personalized career growth</li> <li>Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)</li> <li>Active tech communities with regular knowledge sharing</li> <li>Education reimbursement</li> <li>Memorable anniversary presents</li> <li>Corporate events and team buildings</li> <li>Other location-specific benefits</li> </ul> <p>*not applicable for freelancers</p></div>