Lead React Native Developer

TL;DR

Lead React Native Developer: Leading the development of mobile product features, maintaining the React Native codebase, and defining mobile architecture with an accent on system design and technical strategy. Focus on performance, reliability, and observability standards on mobile.

Location: European Union, Serbia, Georgia, Turkey, Brazil, North Macedonia, Moldova within approximately ± 4 hours of CET.

Company

Ruby Labs is a leading tech company that creates and operates innovative consumer products across the health, education, and entertainment industries.

What you will do

• Lead the development and delivery of new mobile product features.
• Maintain and improve the existing React Native codebase, performance, and stability.
• Define and evolve mobile architecture, system design, and technical strategy.
• Partner with backend, product, and design teams to shape scalable solutions.
• Drive reliability, performance, and observability standards on mobile.
• Mentor engineers and foster a culture of quality, ownership, and execution.

Requirements

• 5+ years of experience building mobile applications, with significant React Native experience.
• 2+ years in a technical leadership, lead, or architect role.
• Strong understanding of mobile system design, component architecture, state management, and navigation patterns.
• Experience optimizing UI performance, memory usage, rendering efficiency, and startup time.
• Shipped and maintained apps on the App Store and Google Play.
• Applicants must be located within approximately ± 4 hours of CET.

Nice to have

• Experience in startup or high-ownership product teams.
• Experience scaling real-time or multi-region mobile architectures.
• Experience designing or building design systems or shared component libraries.

Culture & Benefits

• Embrace the freedom to work from anywhere, anytime, promoting a healthy work-life balance.
• Enjoy unlimited paid time off to recharge and prioritize your well-being.
• Celebrate and relax on national holidays with paid time off.
• Experience seamless productivity with top-notch Apple MacBooks provided.
• Unlock the benefits of flexibility, autonomy, and entrepreneurial opportunities with a flexible independent contractor agreement.

Hiring process

• Recruiter Screening (40 minutes).
• First Interview (30 minutes).
• Technical Interview (45 minutes).
• Final Interview (30 minutes).