Full-Stack Developer (NestJS + React + React Native)

Full-Stack Developer (NestJS + React + React Native)

About the Project

Plumex is a crypto-fintech platform consisting of a mobile application, an admin panel, and a high-load backend. The platform supports multiple blockchain networks (Bitcoin, Ethereum, Solana, Stellar, Tron, TON, BNB), KYC verification, push notifications, biometric authentication, and Google/Apple integrations. The architecture is built on a NestJS monorepo (microservices), React Native (Expo) for mobile, and a Next.js admin panel.

What You'll Do

• Develop and maintain NestJS REST APIs in a microservices architecture
• Implement business logic for crypto wallets, transactions, and multi-chain blockchain operations
• Build and maintain the React Native (Expo) mobile app for iOS and Android
• Develop and extend the Next.js admin panel built on React Admin + MUI
• Work with task queues (Bull/Redis), caching layers, and background processing services
• Integrate third-party services: Firebase, Google Cloud, KYC
• Write unit and integration tests (Jest)
• Participate in code reviews and maintain high code quality standards

Required Technical Skills

Backend:

• NestJS (modules, guards, interceptors, pipes, dependency injection)
• TypeScript — confident level
• PostgreSQL + TypeORM (migrations, relations, query builder)
• Redis (caching, sessions, pub/sub)
• REST API design and Swagger/OpenAPI documentation
• JWT + Passport.js (OAuth2: Google, Apple)
• Bull (queues and background jobs)
• Docker and docker-compose

Mobile:

• React Native (0.7x+) with Expo
• Expo Router (file-based navigation)
• Zustand for state management
• React Query / TanStack Query
• React Hook Form + Zod validation
• Experience with Expo APIs: SecureStore, Camera, Biometrics, Notifications
• Proficiency with React Native Reanimated and gesture handling

Frontend (Admin Panel):

• Next.js (App Router or Pages Router)
• React 18/19 with TypeScript
• MUI (Material-UI)
• React Admin or similar admin frameworks — a plus

General:

• Monorepo experience (Turbo, PNPM workspaces, NestJS monorepo)
• ESLint, Prettier, pre-commit hooks (Husky)
• Git (GitLab / GitHub)
• Basic CI/CD knowledge

Strong Advantages

• Experience with Web3 / blockchain (ethers.js, web3.js, solana/web3.js, bitcoinjs-lib)
• Knowledge of Google Cloud Platform (GCS, KMS, Secret Manager)
• Experience with Firebase (FCM, Admin SDK)
• Background in fintech or crypto domains

Experience Requirements

• 3+ years of commercial backend experience (Node.js / NestJS)
• 2+ years of React Native development experience
• Solid React / Next.js frontend experience
• English — at least technical level (documentation, API references, written communication)