Mobile Application Developer

Senior Software Engineer (Mobile - React Native / Expo)

📍 Zagreb (Hybrid, 2-3 days per week in office)

💼 Permanent

About F24

F24 is Europe’s leading provider of emergency notification and crisis management solutions. Our mission-critical SaaS platform helps organisations prepare for, respond to, and manage emergencies, trusted by over 5,500 companies across 100 countries.

Our mobile apps enable instant, reliable communication during critical situations, and we’re investing heavily in their next evolution.

We’re building a new tech hub in Zagreb and are looking for a Senior Software Engineer (Mobile) to help shape our mobile platform using React Native and Expo.

Why Join Us

• Real Impact – Build mobile apps used in real-world emergency situations
• Modern Stack – React Native + Expo, focused on performance and scalability
• Build, Not Maintain – Shape architecture, tooling, and best practices
• Ownership – Take ideas from concept through to production
• Stable + Growing – Established business with ongoing investment in tech

What You’ll Do

• Build and ship mobile features using React Native and Expo
• Own features end-to-end, from design to production
• Write clean, scalable, and maintainable code
• Collaborate with Product and Design teams
• Improve performance, reliability, and offline capabilities
• Contribute to mobile architecture and engineering standards

Tech Stack

• React Native, Expo
• MobX, Axios, Realm, Firebase
• CI/CD pipelines
• Docker, Kubernetes (platform integration)

What We’re Looking For

• 5-7+ years in software development
• Strong experience with React Native and Expo
• Solid understanding of mobile architecture and state management
• Experience building production-grade mobile apps
• Knowledge of performance optimisation and offline-first apps
• Collaborative and proactive mindset

Why F24

• Mission-critical product with real-world impact
• Opportunity to influence the mobile platform as it evolves
• Long-term investment in engineering and growth in Zagreb
• Hybrid working model (2 days per week in office)