Senior Mobile Developer (React Native)- Remote Brazil

  Type of Employment: Full-Time
Company: Puzzle
Location: Remote Brazil
Tech Stack: (React Native) with deep expertise in frontend development

About Puzzle:

At Puzzle, we deliver innovative technology solutions to businesses across various industries. Our team of passionate professionals is committed to helping our clients achieve their business goals by leveraging the power of technology.

About our Client: 

We are looking for a Senior Mobile Developer (React Native) with deep expertise in frontend development to join a well-established, NASDAQ-listed company that is driving the crypto revolution by making cryptocurrency transactions more accessible and secure. This role requires a highly skilled developer who has built and maintained large-scale, high-performance mobile applications and has an in-depth understanding of React, React Native, and frontend best practices.

  Key Role Expectations:

•  Frontend Focus: This role is for a dedicated front-end developer, not a full-stack developer. The ideal candidate must have hands-on experience working with React and React Native at scale.
• Performance & Optimization: Strong knowledge of optimizing React Native apps, reducing build size, improving performance, and handling platform-specific challenges efficiently.
• Security & Compliance: Experience working in fintech, security, or payments with knowledge of best practices for secure mobile applications (e.g., SSL pinning, encryption, and data protection).
• Hands-On Experience: Must have deep technical expertise in React and React Native, including state management, component lifecycle, and unit testing.
• Large-Scale Application Development: Proven experience developing and scaling React Native applications with a large user base.

 Responsibilities:

• Develop and maintain highly scalable, responsive, and user-friendly mobile applications using React Native.
•  Collaborate closely with backend teams to enhance API integrations and platform usability.
•  Optimize applications for performance, responsiveness, and security across both iOS and Android.
• Ensure robust testing by writing and maintaining unit and integration tests for React Native components.
• Stay ahead of React Native advancements and integrate emerging technologies for continuous improvement.
•   Implement best security practices for fintech applications, including SSL pinning, encryption/decryption techniques, and secure API handling. 
• Lead performance improvements, including ProGuard usage, reducing app size, FCM push notifications, and ensuring smooth animations and interactions.     

 Required Skills & Experience:

• 5+ years of hands-on experience with React (not full-stack, dedicated frontend experience is required).
•  4+ years of hands-on experience with React Native in high-scale mobile applications.
• Strong knowledge of TypeScript (1+ years) OR GraphQL (1+ years).
• Experience with both iOS and Android platforms, including App Store & Play Store deployments.
•  Deep understanding of session management, authentication, and security best practices in front-end applications.  
• Hands-on experience optimizing React Native performance, including app size reduction and ProGuard usage.
• Fintech or security experience is highly preferred (working with payments, banking, or blockchain is a plus).
•  Strong debugging, problem-solving, and code optimization skills.
•  Excellent spoken and written English communication skills.  

Join Us and Enjoy These Perks!

Competitive Salary: Earn a USD salary that matches your skills and experience.
Paid Time Off: We value work-life balance, offering PTO so you can recharge.
Health Insurance Subsidy: Your health matters, and we help with a subsidy to cover your care.
Salary Reviews every year!
Paid Training and Certifications

So what are you waiting for? Put your puzzle-solving skills to the test and join our team today!
Interested in knowing more about our company? Follow us on social media!