Backend

Node.js

Server-side JavaScript runtime: event loop, async, streams and scaling.

NestJS

Curated NestJS interview questions with detailed answers.

Python

Curated Python interview questions with detailed answers.

FastAPI

Curated FastAPI interview questions with detailed answers.

Django

Curated Django interview questions with detailed answers.

Golang

Curated Golang interview questions with detailed answers.

Java

Curated Java interview questions with detailed answers.

PHP

Curated PHP interview questions with detailed answers.

Laravel

Curated Laravel interview questions with detailed answers.

C#

Curated C# interview questions with detailed answers.

Ruby

Curated Ruby interview questions with detailed answers.

GraphQL

Query language and runtime for APIs — typed schema and resolvers, queries, mutations and subscriptions, solving the N+1 problem, and federation across services.

Spring Boot

Building production Java backends with Spring Boot: auto-configuration, dependency injection, REST APIs, Spring Data JPA, security, and microservices.

REST API Design

Designing RESTful APIs: resources and HTTP methods, status codes, versioning, pagination, idempotency, error handling, security, and caching.