Full-Stack Software Engineer (React, Node.js)

This role suits a Middle–Senior Full-Stack Engineer with strong experience in React and Node.js who is comfortable building scalable, production-ready applications. The candidate should have solid skills in REST APIs, relational databases (PostgreSQL/MySQL), ORMs like Sequelize, testing (Jest, Playwright), and tools like Docker and Redis. They should also be familiar with system design, performance optimization, CI/CD workflows, and ideally have experience mentoring and working in collaborative, product-focused teams.

1. How does React handle state management, and when would you use Context vs Redux?
   React manages state locally via hooks like useState and useReducer. Context is suitable for lightweight global state, while Redux is better for complex state logic and large-scale applications.

2. What are the key principles of designing RESTful APIs in Node.js?
   RESTful APIs should follow resource-based URLs, use appropriate HTTP methods, and return consistent status codes. Proper validation, error handling, and versioning are also essential.

3. How does Sequelize ORM work, and what are its advantages?
   Sequelize is an ORM that maps JavaScript objects to relational database tables. It simplifies queries, supports migrations, and provides abstraction over SQL while maintaining flexibility.

4. How would you optimize performance in a Node.js application?
   You can use caching (e.g., Redis), optimize database queries, implement async processing, and use clustering or load balancing to handle high traffic.

5. What is Redis used for, and how does it improve scalability?
   Redis is an in-memory data store used for caching, session storage, and message queues. It reduces database load and speeds up response times.

6. Explain how Docker helps in development and deployment.
   Docker containers ensure consistent environments across development and production. They simplify dependency management and enable scalable, portable deployments.

7. How do you ensure the reliability of your application using Jest and Playwright?
   Jest is used for unit and integration testing, while Playwright handles end-to-end testing. Together, they ensure code correctness and user flow reliability.

8. What are the trade-offs between monolithic and microservices architectures?
   Monoliths are simpler to develop and deploy, while microservices offer better scalability and flexibility but add complexity in communication and deployment.

9. How would you design a multi-tenant application?
   You can isolate tenants via separate databases, schemas, or shared tables with tenant identifiers. Proper data isolation and access control are critical.

10. What best practices do you follow during code reviews?
    Focus on code readability, maintainability, performance, and adherence to standards. Provide constructive feedback and ensure alignment with architecture and business requirements.

Neegles is hiring a Full-Stack Software Engineer (React, Node.js) to build scalable, high-performance applications ranging from multi-tenant marketplaces to enterprise systems. You’ll design and develop full-stack solutions using React, Node.js, PostgreSQL, Redis, Docker, and modern testing tools, collaborating closely with product and design teams. This is a fully remote, full-time role offering competitive, performance-based compensation and flexible work from anywhere. Join a mission-driven team that values innovation, continuous learning, and real-world impact, with strong growth opportunities and a supportive engineering culture.