Job Description:

We are seeking a highly skilled Node.js developer with extensive experience in building scalable, secure, and high-performance web applications. This is an exciting opportunity to work on cutting-edge technology and contribute to the development of an innovative, high-impact product.

You will be responsible for building the backend of a complex, real-time web application using Node.js and Express.js. We are looking for someone who can ensure the application runs smoothly, securely, and scales effectively under high traffic. Your role will involve database management, API development, authentication systems, and deployment, with a focus on high performance and security.

Key Responsibilities:

• Backend Development: Develop and maintain the core backend of the application using Node.js and Express.js. This includes designing and implementing high-performance RESTful APIs and server-side logic.

• Database Integration: Work with SQL (MySQL/PostgreSQL) and NoSQL (MongoDB) databases to design optimized schemas, implement efficient queries, and ensure smooth data flow across the system.

• Authentication & Authorization: Implement secure user authentication and role-based access control (RBAC) using JWT or OAuth2.0, ensuring the safety of sensitive data.

• Security Best Practices: Implement secure coding practices to protect against SQL injection, XSS, CSRF, and other common vulnerabilities. Use industry-standard encryption protocols for sensitive data.

• Performance Optimization: Optimize backend services for speed, scalability, and low latency. Work with load balancing and caching strategies (e.g., Redis, CDNs) to handle large-scale traffic efficiently.

• API Development & Integration: Develop highly efficient APIs that interact with the front-end, third-party services, and external data sources. Ensure real-time data exchange when necessary using WebSockets or GraphQL.

• Testing & Quality Assurance: Write comprehensive unit tests and integration tests using frameworks like Jest, Mocha, or Chai to ensure that the codebase is robust and free of errors.

• Deployment & Cloud Infrastructure: Deploy applications to cloud platforms like AWS, Azure, Google Cloud, or Heroku. Implement CI/CD pipelines for automated deployments and continuous integration.

• Documentation: Maintain clear and concise technical documentation to ensure smooth collaboration and easier onboarding of new developers.

Required Skills and Experience:

• 5+ years of professional experience in backend development with Node.js.

• Strong expertise in Express.js, JavaScript (ES6+), and API design.

• Hands-on experience with NoSQL (MongoDB) and SQL databases (MySQL/PostgreSQL), including schema design, optimization, and query performance.

• Expertise in building secure applications with knowledge of JWT, OAuth, and other authentication techniques.

• Proven experience in microservices architecture, serverless frameworks, or containerized environments (Docker).

• Familiarity with cloud platforms (AWS, GCP, Azure) and experience deploying applications to these environments.

• Expertise in unit testing and integration testing using Jest, Mocha, or Chai.

• Strong understanding of RESTful API design, GraphQL, and WebSockets for real-time data exchange.

• Familiar with CI/CD practices and tools like Jenkins, GitLab CI, CircleCI, or Travis CI.

Nice to Have:

• Knowledge of front-end technologies (e.g., React.js, Vue.js) to better understand the integration between front-end and back-end.

• Experience with Serverless architecture or AWS Lambda.

• Familiar with GraphQL and Apollo Server.

• Experience with WebRTC or other real-time technologies.

• Knowledge of event-driven architecture or Kafka.

Budget:

$3,000 - $7,500 (Fixed Price, depending on scope and milestones)

Project Duration:

Estimated 8-12 weeks (can extend based on performance and further milestones)

How to Apply:

Please submit the following:

1. Links to Node.js projects you’ve worked on, particularly those that are scalable and secure.

2. A brief overview of your experience with Node.js and Express.js.

3. Details of any complex back-end systems or APIs you’ve developed in the past, with a focus on performance optimization.

4. Your estimated timeline to complete the project and key milestones (e.g., initial setup, API development, testing, deployment).

5. A short paragraph on how you approach performance tuning and database optimization in large-scale applications.

Screening Questions:

1. Please share examples of Node.js applications you’ve developed that are currently live and handling high traffic or critical workloads.

2. How do you approach ensuring the security of APIs and sensitive user data in your applications?

3. Can you explain your approach to database optimization and handling large datasets efficiently (both SQL and NoSQL)?

4. What are the challenges you faced while working on microservices or serverless architecture and how did you solve them?