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🔵 PHASE 2 — CORE BACKEND (Weeks 7–14)

🎯 Goal

By the end of this phase, you should be able to:

  • Build a complete backend system
  • Handle auth, caching, async work
  • Write code like someone who understands backend — not just uses it

Reference aligned from your roadmap — but adapted for you.

🧱 Stack (same — don't change)

  • Runtime → Node.js
  • Framework → Express.js
  • DB → PostgreSQL
  • Cache → Redis

⚠️ Rules for Phase 2

  • No switching frameworks
  • No MongoDB distraction
  • Build everything yourself once
  • Understand WHY, not just HOW

📅 WEEK 7–8 → Express + REST (clean backend)

🎯 Focus:

Stop writing messy APIs. Start writing structured backend

🔹 Topics

  • Express routing
  • Middleware (core concept)
  • Request validation
  • Error handling (centralized)

🛠️ Build

Create API:

/users
  GET
  POST
  DELETE

Add structure:

src/
 ├── routes/
 ├── controllers/
 ├── services/
 ├── middleware/

✅ Outcome

  • ✔ You understand request flow
  • ✔ You don't mix logic everywhere

📅 WEEK 9–10 → Database Design + Redis

🎯 Focus:

Write DB logic that doesn't break

🔹 Topics (PostgreSQL)

  • Normalization basics
  • Index (when to use)
  • Avoid N+1 queries
  • Transactions (basic idea)

🔹 Redis

  • What caching is
  • TTL
  • When NOT to cache

🛠️ Build

  • Add caching to your API
  • Example:
    • Cache user list
    • Invalidate on update

✅ Outcome

  • ✔ You reduce DB load
  • ✔ You understand performance basics

📅 WEEK 11–12 → Authentication (CRITICAL)

🎯 Focus:

Build auth properly (not copy-paste)

🔹 Topics

  • Password hashing (bcrypt)
  • JWT (access + refresh tokens)
  • Sessions (basic understanding)
  • Security basics

🛠️ Build

  • Signup
  • Login
  • Protected routes

⚠️ Mistakes to avoid

  • ❌ Storing plain passwords
  • ❌ Copying JWT code blindly

✅ Outcome

  • ✔ You can build real login systems

📅 WEEK 13–14 → Async + Background Jobs

🎯 Focus:

Handle work outside request-response cycle

🔹 Topics

  • Event loop (must understand)
  • Async flow in Node
  • Queues (basic)

🛠️ Build

Example:

  • Email sender (fake or real)
  • Background job (not blocking API)

Tools (simple start):

  • Redis queue OR basic job simulation

✅ Outcome

  • ✔ You understand scalable backend flow

🚀 PHASE 2 FINAL PROJECT (IMPORTANT)

👉 Full Backend System

Build ONE solid project combining everything:

Features:

  • Auth (login/signup)
  • PostgreSQL DB
  • Redis caching
  • Background job (email/logging)
  • Clean API structure

📁 GitHub Structure

phase-2/
 ├── full-backend-system/
 ├── README.md

🧾 README must include:

  • Architecture (very important)
  • API endpoints
  • How caching works
  • How auth works
  • What problems you faced

📊 DAILY ROUTINE (same discipline)

  • 2–3 hrs → Backend
  • 2 hrs → DSA
  • 1 hr → Aptitude