Senior Back End Engineer (Node.js/TypeScript)

Ciklum is looking for a Senior Back End Engineer (Node.js/TypeScript) to join our team full-time in Slovakia. We are a custom product engineering company that supports both multinational organizations and scaling startups to solve their most complex business challenges. With a global team of over 4,000 highly skilled developers, consultants, analysts and product owners, we engineer technology that redefines industries and shapes the way people live. About the role: As a Senior Back End Engineer (Node.js/TypeScript), become a part of a cross-functional development team engineering experiences of tomorrow. Responsibilities: Take full end-to-end ownership of key features in authentication, authorisation, and identity management Design and build high-throughput, distributed backend services using NestJS, TypeScript, Kafka, and Redis Work hands-on with AI tools daily to accelerate development, improve code quality, and explore new capabilities Contribute to architectural decisions and help shape the technical direction of the platform Participate in code reviews and give constructive, thoughtful feedback to your teammates Support and mentor junior colleagues when the opportunity arises, and share your knowledge openly Collaborate closely with product, QA, and DevOps teams on a daily basis Show up to stand-ups, planning sessions, and retrospectives with ideas, not just status updates Requirements: 6+ years of professional backend engineering experience Strong, production-grade TypeScript and Node.js skills - must have Proven experience in high-scale, high-throughput production environments (millions of requests per day) - must have Ability to independently lead feature development from design through to deployment - must have Active daily use of AI development tools such as GitHub Copilot, Cursor, Claude, or similar - must have Experience designing and implementing distributed, event-driven architectures Hands-on experience with NestJS, Kafka, Redis, and MySQL in production Comfortable navigating and improving an existing, mature codebase - not just greenfield projects Good understanding of CI/CD pipelines and release practices Clear, collaborative communication style - someone the team genuinely enjoys working with Desirable: Familiarity with authentication and identity standards: OAuth 2.0, JWT, SAML, WebAuthn, or SSO Experience with AWS and cloud-native architectures Background in security-sensitive engineering, or prior experience as a security champion Experience with designing and integrating large-scale messaging queue services Mentoring or informal technical leadership experience - the team includes junior engineers Interest in or background with developer tooling, SaaS platforms, or identity infrastructure What’s in it for you? Strong community: Work alongside top professionals in a friendly, open-door culture that values initiative and empowers its people to succeed Fast-paced & agile environment: Be part of a dynamic, fast-moving organization that champions efficiency and innovation Global exposure: Collaborate with international, cross-functional teams and contribute to large-scale initiatives Tailored learning: Boost your skills with internal events (meetups, conferences, workshops), Udemy access, language courses, and company-paid certifications Flexibility: Balance office and remote work to fit your rhythm Care: Take advantage of our extensive benefits offering, aligned with the best market standards The salary starts from 3400 Euro gross. The final salary depends on the previous experience and professional knowledge of the candidate. About us: At Ciklum, we are always exploring innovations, empowering each other to achieve more, and engineering solutions that matter. With us, you’ll work with cutting-edge technologies, contribute to impactful projects, and be part of a One Team culture that values collaboration and progress. Our Slovakia hub brings together passionate professionals working on global initiatives. Be part of a close-knit team that’s driving digital transformation and creating lasting impact. Explore, empower, engineer with Ciklum! Interested already? We would love to get to know you! Submit your application. We can’t wait to see you at Ciklum. #LI-LS1