Senior Mobile Developer (all genders)

Permanent employee, Full-time · Zagreb / HR

About the job

Experienced developer to lead technical initiatives, mentor junior team members, and drive architectural decisions. Will take ownership of complex features and serve as technical authority. Works with Product Owners to translate business requirements into scalable, secure mobile solutions.

You

Key Responsibilities
Technical Leadership

Design and implement scalable, secure, cloud-native mobile solutions
Drive architectural decisions and evaluate technology trade-offs
Establish coding standards and best practices for cross-platform and native development
Conduct code reviews and ensure quality adherence
Lead technical discussions on complex problems

Mentorship & Knowledge Transfer

Mentor Professional and Junior developers
Document technical decisions and architectural approaches
Share knowledge through technical talks or pair programming
Guide team on security and cloud-native best practices
Teach both React Native and native development considerations

Feature Ownership & Delivery

Take ownership of complex features from design through production
Work with Product Owner to refine requirements
Estimate and execute deliverables reliably
Identify technical risks early and propose mitigation
Ensure features meet security, performance, and scalability requirements
Manage app store release processes

Continuous Improvement

Identify opportunities for technical optimization and refactoring
Evaluate new tools, frameworks, and approaches
Propose improvements to development processes
Stay current with iOS and Android platform updates

Required Qualifications
Experience

Minimum 7+ years of professional software development
Minimum 4+ years with React Native + Native iOS/Android development
Proven experience designing scalable mobile systems
Strong track record shipping production apps reliably
Experience mentoring or leading other developers
Familiarity with app store deployment processes

Technical Expertise – Mobile Stack

Expert-level React Native with deep understanding of native bridge and platform-specific considerations
Strong iOS development: Swift, native APIs, performance optimization, App Store deployment
Strong Android development: Kotlin/Java, native APIs, performance optimization, Google Play deployment
State management expertise (MobX or Redux patterns)
Mobile-specific skills: offline-first design, performance optimization, memory management, battery efficiency
Firebase proficiency: authentication, real-time databases, cloud functions, analytics
HTTP/REST clients (Axios), local data persistence (Realm)
Understanding of app store processes and mobile-specific security
Native iOS/Android build processes and CI/CD for mobile

Cross-Stack Competencies

Expert REST API design and best practices
Strong security knowledge: authentication, authorization, encryption, mobile security threats
Cloud-native architecture patterns: microservices, distributed systems, resilience
CI/CD pipelines for mobile, automated testing strategies (unit, integration, E2E)
Basic understanding of AI/ML concepts (ideal)

Bonus: Polyglot Capabilities

Experience with Python, PHP, Node.js, Java, or other backends
Ability to understand backend architecture implications

Soft Skills

Excellent communication in English and German
Ability to articulate complex technical concepts clearly
Strong problem-solving and analytical thinking
Mentoring and coaching capabilities
Proactive, self-directed, takes ownership
Comfortable with ambiguity and rapid change

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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.

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Your application

Thank you for considering a career at F24. Please fill out the following form. In case you are experiencing problems with the document upload, mail your documents to jobs@f24.com.