Week 17 — Final Push & Revision

Goal: The final push! Wrap up remaining topics and shift into full revision mode. You’ve put in the work — this week is about consolidating everything into interview-ready confidence.

Topics

Revision Checklist

Go back and re-read these high-impact pages:

JavaScript (most asked):

• Closures · Event Loop · Promises · Prototypal Inheritance · this Keyword

DSA (pattern recognition):

• Common Interview Patterns · Binary Search · BFS and DFS · DP Fundamentals

System Design (framework):

• How to Approach System Design · Design URL Shortener · Design Chat System

DBMS (backend must-knows):

• Indexing · Transactions · SQL vs NoSQL · Caching Patterns

LLD (design skills):

• SOLID Principles · Design Parking Lot · Observer Pattern

Key Concepts

• This week is about filling gaps and building confidence — the new topics are relatively light
• DNS resolution flow — recursive vs iterative, caching at every level
• HTTP fundamentals — GET vs POST vs PUT vs PATCH vs DELETE, status code families, common headers
• Docker Compose for multi-container setups — services, networks, volumes, depends_on
• CI/CD pipelines — build, test, deploy stages, GitHub Actions basics
• Python module system — __init__.py, relative vs absolute imports, package structure
• ATM design — state pattern (idle, card inserted, PIN entered, transaction), transaction types
• Common interview patterns — sliding window, two pointers, fast/slow, BFS/DFS, DP, greedy
• Spend most of your time on revision — you already know this material, now make it instant recall

Practice

• Do a mock system design interview with a 45-minute timer — pick any HLD question and go end-to-end
• Do a mock LLD round — design a system from scratch in 60 minutes, write actual code
• Solve 5 DSA problems under time pressure (20 min each) — one from each pattern family
• Review your weakest collection and re-read at least 3 topics from it

~10 new topics + revision · You’ve covered 216 topics across 8 collections — you’re ready!