Frontend Engineer - Cyrpto and Fintech

As a Frontend Engineer at Wonnpay FZE, you develop and maintain high-quality frontend experiences across the WonnPay platform, including crypto wallets, deposits and withdrawals, transaction flows, KYC, card services, payments, and account management. You work closely with backend engineers, product, UX/UI, QA, compliance, and external technology partners to deliver secure, reliable, and user-friendly fintech products.

What you'll do

• Build and maintain high-quality frontend applications for WonnPay
• Develop crypto-related user experiences including wallets, crypto deposits and withdrawals, blockchain networks, transaction history, address management, QR-based payments, and on-chain transaction status
• Integrate frontend applications with REST APIs and third-party fintech and crypto services
• Work with blockchain-related concepts such as USDT, USDC, BTC, ETH, SOL, TRC-20, ERC-20, and other networks
• Implement secure authentication, session management, MFA, and wallet-related flows
• Build responsive and performant experiences across mobile and web platforms
• Work closely with UX/UI designers to translate designs into production-ready interfaces
• Collaborate with backend engineers to define and consume APIs effectively
• Investigate and resolve frontend production issues, performance problems, and customer-impacting bugs
• Write clean, maintainable, scalable, and well-tested code
• Participate in code reviews and follow engineering standards and best practices
• Work closely with QA to ensure releases are stable and production-ready
• Support rapid product releases while maintaining security, reliability, and code quality

What you bring

• 5+ years of professional frontend development experience
• Strong experience with React, React Native, TypeScript, and JavaScript
• Strong experience building fintech, crypto, blockchain, Web3, wallet, or payment applications
• Good understanding of blockchain and cryptocurrency concepts
• Experience working with crypto wallets, blockchain transactions, token transfers, or payment flows
• Experience integrating REST APIs and third-party services
• Strong understanding of authentication, authorization, API security, and secure frontend development
• Experience working with Git and modern CI/CD development workflows
• Strong debugging and problem-solving skills
• Ability to work in a fast-paced fintech and crypto environment

Nice to have

• Experience with Expo and React Native
• Experience with Web3 libraries and blockchain APIs
• Experience with Fireblocks or other institutional digital-asset infrastructure
• Experience with stablecoins and multi-chain transactions
• Experience with crypto payment providers, exchanges, card platforms, or payment gateways
• Understanding of blockchain transaction confirmations, network fees and gas, wallet addresses, and transaction states
• Experience working with fintech compliance requirements such as KYC and AML
• Experience with AWS and production application monitoring