Questions and topics before the interview

Use the the official documentation or any tutorials you can find - whatever is more convenient for you!

Basics

• TypeScript!!! Learn it and use it everywhere!
• Debugging (in plain JS, TS or Node - anywhere) - learn to debug your code, don't rely on console.logs too much
• Git (add, commit, log, status, branch, push, pull, fetch, reset, restore, revert, stash, cherry-pick).
  • Git strategies: git flow! https://www.flagship.io/git-branching-strategies/
    • how to make proper commits (how often, what to add to the commit, what is a good description of the commit)
• What is Scrum? How do you work by Scrum?

---

JS and general programming concepts ( start here https://javascript.info/ and continue anywhere)

• Objects:
  • property descriptors and accessors
  • iterators and generators
• this
• Arrow functions vs. regular functions
• function declaration vs. function expression
• Error handling - try..catch..finally
• Iterators and generators
• Map and Set, WeakMap and WeakSet
• Classes:
  • basics
  • prototype inheritance
  • extending classes
  • abstract classes
• Promises and async, promisification
• Client-server interaction:
  • polling (request-response)
  • long polling
  • server-sent events
  • websockets (socket.io or others)
• RegExp
• Event loop

Common theoretical principles

• OOP principles (abstraction, inheritance, polymorphism, encapsulation)
• Inheritance vs. Composition
• DRY
• KISS
• SOLID
• YAGNI

Patterns

• Architecture patterns:
  • MVC / MVP https://www.baeldung.com/mvc-vs-mvp-pattern
  • Multi-layer architecture (controllers, services, repositories)
• Design patterns: the more - the better
  • start here https://youtu.be/YJVj4XNASDk
  • and continue here https://refactoring.guru/uk/design-patterns

---

Back-end

• Postman (find the official tutorial)
• PostgreSQL + TypeORM
• Mongo + Mongoose / TypeORM
• Node basics:
  • core modules (fs, path, URL, crypto)
  • validation (JOI / class-validator for Nest)
• Node frameworks:
  • Express / Fastify (similar to Express, https://www.fastify.io/)
  • Nest.js (complex framework for a beginner) https://docs.nestjs.com/
• Swagger (OpenAPI) - documenting your API (there are modules for quick swagger generation for Express, Fastify and Nest)
• Docker, docker compose