React Native Developer (Blockchain/Crypto)

React Native Developer (Blockchain/Crypto)

The client is an innovative global fintech leader behind USDT, the world’s largest and most widely used stablecoin.

We are looking for a React Native Developer with solid experience in blockchain/crypto/ wallets to help us build secure applications.

Responsibilities

• Design, develop and maintain mobile applications using React Native (iOS & Android)
• Integrate applications with Bitcoin / Web3 / blockchain APIs and wallet backends
• Work with wallet functionality: addresses, balances, transactions, seed phrases, private keys (never exposing them insecurely)
• Implement mobile security best practices: secure storage, encryption, device integrity checks, protection from common attack vectors
• Collaborate with backend, security, and product teams to design features for decentralized and crypto-enabled products
• Participate in code reviews, architecture discussions, and technical decisions
• Write clean, testable, well-documented code

Requirements

• 4+ years of experience in in React Native
• Strong knowledge of TypeScript / JavaScript and the React ecosystem
• Proven experience with blockchain / crypto / wallet applications
• Experience working with Bitcoin, Web3, wallets, private keys, or similar technologies
• Good understanding of mobile security: secure storage, key management, encryption, secure communication
• Understanding of decentralized systems and concepts like public/private keys, transactions, addresses, signing, gas/fees, etc.
• Experience integrating REST/WebSocket APIs and working with real-time data
• Comfortable working in a remote, distributed team, communicating in English (spoken and written)

Nice to have

• Experience with hardware wallets or secure elements
• Knowledge of Layer 2 solutions, sidechains, or Lightning Network
• Experience with performance optimization and profiling for mobile apps
• Background in cryptography or security engineering