Hire Node.js Developers for Scalable Nearshore Solutions

The Node.js evaluation is centered on a candidate's mastery of the asynchronous programming model and backend architecture. The critical assessment point is the Node.js Event Loop: candidates are given scenarios that intentionally lead to blocking code and are required to diagnose the bottleneck and refactor it into a non-blocking solution, demonstrating an understanding of the different phases (Timers, Pending Callbacks, I/O, Check, Close). For architecture, we evaluate their ability to design a scalable API using modern frameworks (e.g., NestJS, Express) with a clear separation of concerns (e.g., service and repository layers). We specifically test their knowledge of security best practices, including correct implementation of CORS, handling JWTs, and using validation libraries to prevent common API vulnerabilities. Finally, we assess their proficiency with ORMs (e.g., Prisma, TypeORM) and their ability to integrate with diverse data stores (PostgreSQL, MongoDB) efficiently.