CRUD Operations
Authentication & Authorization (OAuth, JWT)
MVC Architecture
Middlewares
Logging & Error Handling
Environments & Configuration
💡 Tip: Combine these concepts with a small Express, Flask or ASP.NET Core project for better understanding.
Node.js
Express.js Crash Course
Express Middleware
.NET / ASP.NET Core
MVC vs Minimal APIs
Dependency Injection in ASP.NET Core
Python
Flask vs Django
Build REST APIs with Flask
Java
Spring Boot Basics
Dependency Injection in Spring
SQL Basics (PostgreSQL / SQL Server)
Writing Queries with JOINs
Indexing & Query Optimization
ORM (Entity Framework, Sequelize, SQLAlchemy)
NoSQL (MongoDB Essentials)
Build a Notes API
Build an Auth System with JWT
Blog CMS Backend
File Upload API with Validation
💡 Bonus: Provide GitHub repo links or starter templates later.
Caching Strategies (Redis, In-Memory)
Background Jobs (Hangfire, BullMQ, Celery)
Message Queues (RabbitMQ, Kafka)
Microservices & gRPC
API Versioning
Rate Limiting & Throttling
Common Backend Interview Questions
System Design Basics
Build a Scalable URL Shortener
Explain REST vs GraphQL
Input Validation
XSS, CSRF, SQL Injection
HTTPS & TLS
Secure Password Storage (bcrypt, PBKDF2)
🛡️ Security first! Add these even to your smallest side projects.
Top GitHub Repos to Learn Backend
Awesome Backend Dev Lists
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