Senior Backend Engineer

About The Job F24 is Europe's leading provider of crisis management and emergency notification software, helping thousands of organisations around the world respond quickly during critical situations. We're expanding our growing Zagreb Engineering Centre of Excellence with a brand-new Suite team. This team will play a key role in modernising our product portfolio by building a new unified frontend while integrating backend capabilities across multiple existing applications. This is a unique opportunity to join at the beginning of a new team, helping shape both the technical direction and engineering culture from day one. Why F24? You'll join a small, highly autonomous engineering team where senior engineers are trusted to make architectural decisions, influence technical direction, and take ownership from design through to delivery. Initially you'll help expose and consolidate APIs across multiple products while supporting a brand-new React frontend. As the platform evolves, you'll play an important role in building the next generation of our Suite products using modern cloud-native technologies. Working alongside Product, Design and QA from the outset, you'll be part of cross-functional teams focused on delivering high-quality software rather than following rigid processes. What You'll Be Doing Design, build and maintain backend services using Node.js and PythonDevelop and expose APIs that integrate multiple existing F24 productsContribute to architectural decisions and technical directionCollaborate closely with Frontend, Product, Design and QA teamsTake ownership of features from design through to productionEnsure solutions are scalable, secure and maintainableSupport modern engineering practices including code reviews and automated testingContribute to the evolution of a brand-new engineering team You'll Likely Have Experience With Strong commercial experience with Node.jsExperience with NestJS (or similar frameworks such as Express or Fastify)Python development, ideally using FastAPIREST APIs and distributed systemsModern software architecture and cloud-native developmentCI/CD and automated testingWorking within agile product teamsTaking ownership of technical decisions and delivery Experience with React or frontend technologies is beneficial but not essential—this role has a strong backend focus. What You'll Enjoy Joining a brand-new engineering team from the ground upHigh levels of autonomy with minimal micromanagementReal influence over architecture and technical decisionsCross-functional collaboration with Product, Design and QAClear progression into either Technical Leadership or People ManagementModern technology stack and ambitious product roadmapFriendly engineering culture focused on collaboration, learning and innovation. Tools & Technologies: Node.js | NestJS | Python | FastAPI | TypeScript | React | Next.js | REST APIs | JSON | Tailwind CSS | shadcn/ui | Git | CI/CD | Cloud-native architecture | IntelliJ IDEA Nice To Have Express.js | Fastify | Automated Testing (Unit, Integration & API) | Distributed Systems | Microservices | AI-assisted development | Docker | Kubernetes About Us What we do: F24 is Europe’s leading Software-as-a-Service (SaaS) provider for resilience. More than 5,500 customers worldwide rely on F24’s digital solutions, which support companies and organisations through all areas of resilience. Solutions cover business messaging and service notification, emergency and mass notification, incident and crisis management, as well as governance, risk and compliance. F24 supports customers in virtually every sector ranging from energy, healthcare, industry, finance, IT, tourism and aviation to a wide variety of public organisations. Many years of international experience have made F24 experts in improving resilience with digital solutions. The company was founded in 2000 in Munich, where F24 AG’s head office is still located. Today, F24 supports companies and organisations in more than one hundred countries, via more than 20 locations in Europe and beyond. The F24 AG Board of Directors consists of F24 co-founder Christian Götz and the spokesperson Dr. Jörg Rahmer. Find out more about working at F24 here. Good Reasons To Work At F24 Have a tangible impact! Work in an agile environment where you make an important contribution to the success of our customers and the future of our company.Become part of our established company with an inspiring culture, flat hierarchies and our open, honest, innovative and supportive team!Grow with us: We are a company on the road to success, experiencing steady international growth. You have the opportunity to help shape our development. Take advantage of our flexible working model: We rely on a combination of presence in our offices and work from home. This way we strengthen our team spirit and at the same time gives you the opportunity to achieve the best possible balance between private and professional life.