Senior Node.js Engineer

Senior Software Engineer📍Zagreb | Hybrid F24 is Europe's leading crisis management SaaS platform, trusted by governments, airlines, banks, and Fortune 500s in over 100 countries. When a major incident unfolds, our software is the system people rely on. Our Zagreb Tech Centre is already up and running. Wave 1 of our engineering team is in place, and we're now expanding into Wave 2, bringing in more senior engineers to accelerate the work already underway. Why F24? You'll be working on technology that genuinely matters. The Services team is the result of merging two established backend teams into one — responsible for roughly 10 shared services that run across every F24 product. We're talking high-performance event logging, billing, unified data object storage, single sign-on, user services, asset services, and more. These aren't isolated features; they're the foundational layer that every product in the portfolio depends on. The work is technically complex: horizontally scalable microservices, event-driven architecture with Kafka and RabbitMQ, multi-database design with a real focus on query performance, and streaming services built for scale. You'll also be working directly alongside F24's AI engineers on RAG pipelines, MCP servers, and LLM streaming integrations. This is an opportunity to: Build shared services used by 5,500+ organisations worldwideWork on high-performance, event-driven systems where throughput and reliability are non-negotiable Influence architecture across a portfolio of products, not just a single codebaseJoin a growing engineering hub with significant investment and long-term growth plansCollaborate with AI engineers, DevOps, and Architecture teams across EuropeHelp build the secure, scalable foundation that F24's future product suite is built on What You'll Bring: Strong Node.js backend experienceA background working in product SaaS environments at scaleFamiliarity with distributed systems, message brokers, and cloud-native practicesHands-on exposure to AI tools or ML integrationA collaborative mindset and a desire to solve complex technical challenges Tech Stack: Node.js | TypeScript | Nest/Next | RabbitMQ | Kafka | Redis | Docker | Kubernetes | WebSockets | OAuth2 | GitLab CI About F24 F24 is Europe's leading provider of crisis management and emergency notification software. Trusted by more than 5,500 organisations globally, we're helping businesses protect their people, operations, and reputation when it matters most. If you're looking for a role where you can make a genuine impact while helping shape a growing engineering organisation, we'd love to hear from you. Salary is paying up to €48,420 (Gross) annually.