Lead Java Developer

Lead Java Developer📍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.

Why F24?

You’ll be working on technology that genuinely matters.

The ENS Portal team looks after the web platform that powers F24’s emergency notification service. It’s the interface thousands of organisations use to reach their people when every minute counts, and it needs to be fast, secure, and reliable under pressure. As Lead Java Developer, you’ll own the technical direction of the team, setting the vision, guiding architecture, and staying hands-on in the code (around 40–50% of your time).

The work is technically rich: a Java/Spring Boot backend and Angular front end, event-driven messaging with RabbitMQ, distributed caching with Hazelcast, real-time communication over WebSockets, and a push towards cloud-native delivery on Docker and Kubernetes.

This is an opportunity to:

• Shape the platform that powers global emergency communication for 5,500+ organisations
• Lead by doing: write complex features yourself while mentoring and growing the engineers around you
• Guide architectural decisions and set the coding standards the team works to
• Drive cloud-native adoption and security best practice
• Work closely with Product Owners and the Software Architect on roadmap priorities
• Join a growing engineering hub with significant investment and long-term growth plans in Croatia

What You’ll Bring:

• 5–7+ years in software development, including 3+ years in a senior or lead role
• Strong Java and Spring Boot experience (Spring Core, Security, Data JPA) with Hibernate
• Solid Angular experience on the front end
• Familiarity with message brokers and distributed caching (RabbitMQ, Hazelcast)
• A good grasp of cloud-native principles, secure coding, and CI/CD pipelines
• A hands-on, pragmatic mindset and a real passion for building scalable systems

Tech Stack: Java | Spring Boot | Hibernate | Jersey | Jackson | Drools | Quartz | Angular | SASS | Hazelcast | RabbitMQ | WebSockets | Jasper Reports | Docker | Kubernetes

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. We’re founder-owned, multinational, and collaborative.

If you’re looking for a role where you can lead a critical product team and help shape a growing engineering organisation, we’d love to hear from you.

Salary is paying up to €55,000 (Gross) annually.