Backend Developer (Node.js)

This position is well suited for a backend engineer with solid Node.js experience who enjoys building scalable services, working with high-load databases, and implementing modern API patterns like REST, GraphQL, and WebSockets. It’s a strong match for someone who is comfortable with microservices, message brokers, caching layers, and test-driven development, and who wants to contribute to production-ready systems while growing within a large international organization that offers project variety, professional development, and long-term career opportunities.

1. What Node.js frameworks or libraries do you typically use for building backend APIs and why?
   I usually use Express or NestJS because they provide a clear structure for routing, middleware, and dependency injection, making it easier to build scalable and maintainable APIs.

2. How do you design and optimize high-loaded databases with MongoDB or MySQL?
   I design proper indexes, normalize or denormalize data where appropriate, use query profiling tools, and apply pagination, caching, and connection pooling to handle high load efficiently.

3. What is your approach to implementing REST and GraphQL APIs in Node.js?
   For REST, I define clear resource-based endpoints and status codes; for GraphQL, I design a schema with types and resolvers, using libraries like Apollo Server and validating inputs and errors consistently.

4. How do you use WebSockets in Node.js for real-time features?
   I use libraries like Socket.IO or ws, manage rooms or channels for targeted updates, and implement authentication and reconnection logic to ensure reliable real-time communication.

5. Can you explain the principles of microservice architecture and how you apply them?
   Microservices break a system into small, independently deployable services with clear boundaries, communicating via APIs or messaging; I focus on loose coupling, independent scaling, and well-defined contracts.

6. How do you apply TDD when developing Node.js services?
   I start by writing failing unit tests that describe the desired behavior, implement the minimum code to pass them, then refactor while keeping tests green, using tools like Jest or Mocha/Chai.

7. What are common use cases for Redis in your backend projects?
   I use Redis for caching expensive queries, storing session data, implementing rate limiting, and sometimes as a simple message broker or distributed lock mechanism.

8. How have you used RabbitMQ in distributed systems?
   I use RabbitMQ for decoupling services via asynchronous message queues, implementing patterns like pub/sub and work queues, and ensuring reliability with acknowledgments and dead-letter queues.

9. How do you ensure smooth operation and monitoring of Node.js applications in production?
   I implement structured logging, health checks, and metrics, use process managers like PM2 or container orchestration, and rely on monitoring tools and alerts to detect and resolve issues quickly.

10. What is your typical Git workflow when working in a team?
    I follow a feature-branch workflow, commit frequently with clear messages, open pull requests for review, resolve conflicts as needed, and keep branches updated through rebasing or merging.

Andersen is hiring a Backend Developer (Node.js) to build high-load, scalable services for global clients in FinTech, Healthcare, Retail, Telecom, and more. You’ll work with Node.js, MongoDB, MySQL, Redis, RabbitMQ, REST, GraphQL, and WebSockets in a microservices environment, contributing to new features, refactoring, and production reliability. The role offers flexible work options (remote, office, or hybrid), strong mentoring and career-growth programs, plus bonuses of up to an additional 1,000 EUR per month. Join a 3,500+ expert international team and work on impactful projects for brands like Samsung, Siemens, Mercedes, and Allianz.