Node.js Developer Needed for Scalable Backend APIs and Real-Time Applications

We're looking for an experienced Node.js Developer to design, develop, and maintain robust backend systems, RESTful APIs, and scalable microservices.

The ideal candidate understands event-driven architecture, has hands-on experience with Express.js, and can deliver clean, efficient, and secure server-side code.

You'll collaborate with front-end teams, database engineers, and DevOps specialists to create performant backend infrastructures powering modern web and mobile applications.

Key Responsibilities:

Develop and maintain backend logic using Node.js and Express.js

Design and build RESTful APIs and GraphQL endpoints

Create and manage microservices architecture for scalability

Implement real-time communication using WebSockets / Socket.IO

Integrate third-party services (payment gateways, authentication, etc.)

Build secure authentication and authorization (JWT, OAuth2)

Write efficient database queries with MongoDB, MySQL, or PostgreSQL

Optimize backend performance and caching strategies

Debug, test, and refactor existing codebases

Implement CI/CD pipelines for continuous deployment

Manage source control with Git / GitHub

Collaborate with frontend and DevOps teams on API consumption and deployment

Write detailed documentation for APIs and backend services

Required Skills:

3+ years of backend development experience using Node.js

Expertise in Express.js or NestJS frameworks

Strong proficiency in JavaScript (ES6+) and TypeScript

REST API and GraphQL experience

Database skills in MongoDB, MySQL, or PostgreSQL

Authentication and authorization (JWT, OAuth2, Passport.js)

Hands-on experience with Docker, Nginx, and PM2

Unit testing with Jest / Mocha / Chai

Familiarity with Redis, Kafka, or RabbitMQ for messaging

Version control using Git

Knowledge of Linux / Ubuntu server environments

Understanding of async programming and event loops

Familiarity with AWS / GCP / Azure for cloud deployment

Node.js Core Concepts:

1. Event-Driven Architecture:

Non-blocking I/O

Event emitters and listeners

Callback and promise handling

2. Modules & Packages:

CommonJS and ES Modules

NPM / Yarn dependency management

Package versioning and scripts

3. Asynchronous Programming:

Promises and async/await

Error handling and try/catch

Parallel and sequential task execution

4. Express.js Fundamentals:

Middleware functions

Route handling (GET, POST, PUT, DELETE)

Error handling middleware

Static file serving

Request validation with express-validator

5. Database Integration:

Mongoose for MongoDB

Sequelize / Prisma ORM for SQL databases

CRUD operations

Connection pooling and query optimization

6. Authentication & Security:

JWT and session-based authentication

OAuth2 with Google/Facebook login

Password hashing (bcrypt)

Rate limiting (express-rate-limit)

Input sanitization and validation

Performance Optimization:

Implement caching with Redis

Use clustering with PM2 for load balancing

Optimize queries and indexing

Compression middleware (gzip/brotli)

Asynchronous file handling (fs/promises)

Avoid memory leaks with profiling tools

Testing & Debugging Tools:

Jest / Mocha / Chai for unit tests

Supertest for endpoint testing

Postman for API testing

Node Inspector / Chrome DevTools for debugging

ESLint + Prettier for code consistency

Tools & Technologies:

Runtime: Node.js (v18+)

Frameworks: Express.js, NestJS, Koa.js

Databases: MongoDB, PostgreSQL, MySQL

ORMs: Mongoose, Sequelize, Prisma

API Tools: Postman, Swagger, GraphQL Playground

Version Control: Git, GitHub, GitLab

CI/CD: Jenkins, GitHub Actions, Docker

Cloud Platforms: AWS (EC2, Lambda), GCP, Azure

Logging & Monitoring: Winston, Morgan, Elastic Stack

Best Practices:

Follow MVC architecture

Keep controllers lightweight

Validate input and sanitize user data

Log errors using Winston

Implement API rate limiting

Separate environment variables (.env)

Avoid blocking operations

Use middleware for reusable logic

Write meaningful commit messages

Follow DRY and SOLID principles

Security Considerations:

Secure headers (Helmet.js)

SQL/NoSQL injection prevention

CSRF and XSS protection

Password encryption with bcrypt

HTTPS and SSL configuration

Sanitization of inputs

Regular dependency audits

Deliverables:

✅ Scalable, production-ready backend application

✅ Documented REST APIs with Swagger

✅ Authentication & Authorization system

✅ Optimized database schema

✅ Unit and integration tests

✅ Dockerized environment for deployment

✅ CI/CD pipeline integration

✅ Logging and monitoring setup

✅ API usage documentation

✅ One round of performance and security audit

Budget:

💰 $40 – $90/hour or $3,000 – $10,000/project (depending on complexity)

Timeline:

⏳ 4 – 10 weeks (depending on scope, integrations, and scaling needs)

KPIs & Performance Metrics:

API response time < 200ms

99.9% uptime post-deployment

Zero critical vulnerabilities (OWASP)

Error rate < 0.5%

90%+ test coverage on APIs

Compliance & Standards:

Follows RESTful design principles

Follows PSR-12 and ESLint code style rules

Implements OpenAPI (Swagger) standards

Meets OWASP Top 10 security compliance

Adheres to GDPR if user data is handled

Emerging Trends in Node.js Development:

Serverless architecture (AWS Lambda, Vercel)

Microservices with Docker & Kubernetes

TypeScript adoption in backend

GraphQL and Apollo Server

Edge computing with Cloudflare Workers

AI/ML integration via TensorFlow.js

Deliverables Recap:

✅ RESTful API with CRUD endpoints

✅ Secure authentication system

✅ Database design and integration

✅ Optimized performance with caching

✅ Full deployment documentation

✅ Logging, error tracking, and monitoring setup

This role is ideal for backend developers who thrive on scalability, real-time performance, and clean, efficient code — powering web apps that never slow down. ⚡