Lead React Native Engineer

THE PLACE

ITRex - AI pioneers who build systems that actually work in the real world, not just in demos. We're 200+ people spread across the US and Europe, creating solutions for companies like P&G and Shutterstock. We keep it simple, build it right, and focus on what works.

We're the kind of people who don't ignore messages in Slack, who jump in to help when you're stuck on a problem, and who offer solutions instead of blame when things go sideways. We believe in openness, accountability, and having each other's backs. No office politics, no hidden agendas - just people who care about doing good work together and supporting each other to get there.

• Architect, build, and maintain high-performance, scalable React Native applications for iOS and Android.
• Lead and mentor a team of React Native developers, providing technical guidance and conducting code reviews.
• Collaborate with Product, Design, and Backend teams to define requirements and deliver new features.
• Communicate and collaborate with external partners, including banks, SDK vendors, and 3rd-party providers, to support integrations, resolve issues, and ensure technical alignment.
• Integrate and maintain third-party SDKs, native modules, and Web3/crypto libraries.
• Implement Web3 functionality, including wallet features, signing, and smart contract interactions.
• Ensure secure handling of sensitive data (private keys, seed phrases) and enforce mobile security best practices.
• Ensure top-level application performance, responsiveness, and overall app quality.
• Identify and resolve performance bottlenecks, defects, and reliability issues.
• Implement and maintain comprehensive test coverage (unit, integration, E2E).
• Work with CI/CD pipelines to support automated build, testing, and deployment processes.
• Research, evaluate, and introduce new technologies and best practices to improve product quality and development efficiency.
• Maintain clear technical documentation and promote knowledge sharing within the team.
• Participate in the full application development lifecycle, from initial concept to production deployment.

React Native & Mobile Development

• 5+ years of experience in mobile development with a focus on React Native.
• Deep understanding of React Native architecture, preferably also exposure to Fabric and Turbo Modules.
• Proven ability to architect, build and maintain high-performance, scalable mobile applications.
• Expertise in application performance optimization, debugging, and profiling.
• Strong knowledge of Type Script and experience enforcing strict typing practices.
• Experience publishing and maintaining apps in App Store and Google Play.

Blockchain & Web3

• Hands-on experience in crypto & blockchain development (crypto wallets, signing, transactions).
• Strong understanding of Web3 technologies:
  Wallet Connect, EVM networks, RPC, smart contract interaction.
• Experience with secure key storage, seed phrase handling, encryption, private key management, and cryptography best practices.
• Experience integrating complex SDKs/APIs, bridging native iOS/Android SDKs, and working with Web3/crypto libraries.
• Understanding of ERC standards and token metadata structures.

Leadership & Processes

• Proven technical leadership experience, including mentoring, code reviews, and architectural guidance.
• Ability to lead and coordinate a team of React Native developers.
• Experience collaborating effectively with Product, Design, and Backend teams to define and deliver features.
• Strong communication skills with the ability to clearly articulate technical decisions.
• Experience working with CI/CD pipelines for mobile applications.
• Ability to manage the full development lifecycle: planning, implementation, testing, and deployment.
• Expertise in identifying, analyzing, and resolving application bottlenecks and performance issues.
• Experience building and maintaining robust testing strategies (unit, integration, E2E).
• Ability to research, evaluate, and introduce new technologies and best practices.
• Strong understanding of mobile security principles, secure data storage, and anti-fraud mechanisms.
• Experience operating in fast-paced environments and making informed…