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ITRex Group

React Native Engineer

ITRex Group

. Architect, build, and maintain high-performance, scalable React Native applications for iOS and Android .

Posted 10/27/2026full-timeRemote • Poland, Serbia, Romania, UkraineMid-LevelSeniorWebsite

Core Competencies

Role fit
Core Competencies

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Demonstrates expertise in architecting and maintaining high-performance React Native applications for both iOS and Android, with a strong focus on mobile security, performance optimization, and integration of third-party SDKs and Web3 technologies.

Highest-signal resume keywords
React Native DevelopmentApplication Performance OptimizationTypeScript ExpertiseMobile Security PrinciplesTesting Strategies (Unit, Integration, E2E)

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
React NativeTypeScriptApplication Performance OptimizationDebuggingProfilingUnit TestingIntegration TestingE2E TestingWeb3 Functionality ImplementationCrypto Development
Soft Skills
CollaborationCommunicationProblem-SolvingDecision-MakingAdaptability
Tools & Technologies
CI/CD PipelinesSDK IntegrationMobile Security Best PracticesFabricTurboModules
Industry Keywords
Mobile DevelopmentApp StoreGoogle PlayWeb3 TechnologiesCrypto WalletsSmart ContractsSecure Data StoragePrivate Key ManagementERC StandardsToken Metadata Structures

Tech Stack

Tools & technologies
AndroidiOSReactReact NativeTypeScriptWeb3

About the role

Key responsibilities & impact
  • Architect, build, and maintain high-performance, scalable React Native applications for iOS and Android
  • 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, including private keys and 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 unit, integration, and E2E test coverage
  • 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
  • Participate in the full application development lifecycle, from initial concept to production deployment

Requirements

What you’ll need
  • 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 TurboModules
  • Proven ability to architect, build and maintain high-performance, scalable mobile applications
  • Expertise in application performance optimization, debugging, and profiling
  • Strong knowledge of TypeScript and experience enforcing strict typing practices
  • Experience publishing and maintaining apps in App Store and Google Play
  • 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 decisions under uncertainty
  • English: Upper-Intermediate or higher
  • Nice to have: Hands-on experience in crypto & blockchain development (crypto wallets, signing, transactions)
  • Nice to have: Strong understanding of Web3 technologies: WalletConnect, EVM networks, RPC, smart contract interaction
  • Nice to have: Experience with secure key storage, seed phrase handling, encryption, private key management, and cryptography best practices
  • Nice to have: Experience integrating complex SDKs/APIs, bridging native iOS/Android SDKs, and working with Web3/crypto libraries
  • Nice to have: Understanding of ERC standards and token metadata structures

Benefits

Comp & perks
  • Remote flexibility: Work where and how you work best - we trust you to deliver
  • Competitive salary + benefits that matter (medical, wellness, learning)
  • Ownership opportunities: See a problem worth solving? Own it. We back smart risks over bureaucratic safety
  • AI enhancement: We leverage AI to make you faster and stronger - complementing your abilities, not replacing them
  • English classes
  • Professional development
  • Well-being support
  • Career progression: Real paths up, not just sideways shuffling
  • Responsive teammates: No ignored Slacks, no "not my problem" attitudes
  • Supportive culture: When you're stuck, people help. When things break, we fix them together
  • Regular meetups
  • Tech talks
  • Human connections: actual relationships beyond work