Full Stack Engineer

Company Description:Wonnpay is a crypto-native payment network built for global citizens, high-value individuals, and mobile-first entrepreneurs. Our mission is to make transactions smarter, faster, and more secure by providing innovative payment solutions that streamline financial operations and empower businesses to grow. Focused on adapting to the evolving needs of modern commerce, Wonnpay delivers scalable and efficient digital payment infrastructures. Driven by technology and a commitment to trust, we help partners succeed in the rapidly changing world of finance.Role Description:We’re hiring a Full Stack Engineer to own features end to end across our mobile app and backend API. You’ll move comfortably from a React Native screen, through a NestJS service, down to a card transaction or an on- chain wallet operation. This is a high-ownership role on a small, senior team -your work ships with your name on it, into production that real customers depend on. The candidate will contribute to our mission of delivering innovative payment and fintech solutions for a global audience.What You’ll Work On:Ship user-facing features across the Expo / React Native app and the NestJS / PostgreSQL APIBuild and extend our embedded self-custodial wallet (account-abstraction based) and the on-chain moneymovement around itIntegrate and harden payment, card, and KYC flows with our processing and identity partnersStrengthen the platform for scale and compliance — observability, secure secrets handling, webhook signatureverification, and clean data migrationsDeliver a first-class experience in five locales, including full Arabic RTL supportQualifications5+ years building and shipping production web and/or mobile applicationsStrong TypeScript across both front end and back endFrontend: React and/or React Native (Expo), with solid state management (Redux Toolkit or similar) and mobile build/release experienceBackend: NestJS or a comparable Node.js framework (Express, Fastify), with REST API design experienceStrong relational database skills (PostgreSQL) and ORM experience (TypeORM or equivalent), including migrationsHands-on experience with a major cloud provider — we run on AWS (App Runner, S3, Secrets Manager)Disciplined Git workflow: feature branching, pull requests, code review, and CIA security-first mindset — you understand why secrets never touch git and why every webhook must be verifiedKey Responsibilities:Design, build, test, and maintain features across mobile (Expo, React Native, Redux Toolkit, expo-router) and backend (NestJS, TypeORM, PostgreSQL)Write clean, well-typed TypeScript on both sides of the stack and uphold the team’s coding guidelinesBuild secure, well-documented REST APIs; maintain reliable database migrations and data integrityIntegrate third-party services (payments, KYC, wallet, email, storage) with rigorous error handling and signature verificationOwn your work through the full lifecycle — PR, code review, CI, QA verification, staging soak, and production releaseWrite unit and integration tests; treat tests as part of “done,” not an afterthoughtManage environment configuration and secrets securely across dev, staging, and productionCoordinate API contracts between mobile and backend, and collaborate through Git and code reviewMonitor production (Sentry, logs) and participate in incident response and post-mortemsPreferred Experience:• Fintech, payments, or other regulated-environment experience• Web3 / blockchain familiarity — EVM chains, ERC-20 tokens, wallets, account abstraction (ERC-4337), orSDKs such as Dynamic or Privy• Experience integrating card issuing / processing, KYC & identity (e.g. Sumsub), or custody providers• Localization and right-to-left (Arabic) experience• Familiarity with Sentry, EAS (Expo Application Services), and CI/CD pipelines• Comfort operating in an early-stage, high-ownership teamTechnical Specifications:Mobile: React Native (0.79), Expo 53, TypeScript, Redux Toolkit, Redux-Persist, Expo-Router, Expo-Secure-StoreBackend: NestJS 10, TypeScript, TypeORM, PostgreSQLWeb3 & Wallet: Embedded self-custodial wallet via Account Abstraction (Dynamic Labs SDK), EVM IntegrationsFintech Integrations: Card issuing / VISA processing, KYC & identity verificationCloud & Infra: AWS (App Runner, S3, Secrets Manager)Tooling & DevOps: EAS, Sentry, GitHub, Jira, Confluence, SlackType:Full TimeWork Setup:Hybrid