Cracking a FAANG (Facebook, Amazon, Apple, Netflix, Google)-level internship involves more than just coding skills — it requires the ability to efficiently solve real-world problems using Data Structures and Algorithms (DSA).
Whether you are a computer science undergraduate or a self-taught developer, mastering DSA is your key to gaining entry into leading tech firms.
But where should you focus your practice?
In this article, I will guide you through the top 10 websites (both free and paid) that can help you master DSA and prepare effectively for product-based companies.
Let’s get started! 💻
1. LeetCode
Best For: FAANG-level coding challenges, authentic interview experiences, competitions
Highlights:
Company-specific questions (Google, Amazon, etc.)
Topics: Arrays, Trees, Graphs, Dynamic Programming
Weekly contests to enhance speed
Pro Tip: Complete the "LeetCode 75" curated list for preparation focused on product-based roles.
2. GeeksforGeeks (GFG)
Website: https://geeksforgeeks.org
Best For: Ranging from Beginners to Advanced, clarity of concepts + practice
Highlights:
Practice organized by topic
Essential Coding Questions to tackle
Interview experiences shared by top companies
Self-Paced DSA Course (Affordable + widely recognized)
GFG is the most popular platform in India for computer science preparation.
3. InterviewBit
Website: https://www.interviewbit.com
Best For: Systematic preparation + content at the interview level
Highlights:
Guided tracks organized by company and topic
Mock interviews available
User-friendly interface, gamified progress tracking
Interview referrals through Scaler Academy (optional)
Ideal for individuals seeking a structured progression roadmap.
4.Codeforces
Website: https://codeforces.com
Best For: Competitive programming and problem-solving skills
Highlights:
Real-time competitions
Editorials providing comprehensive solutions
Practice under timed conditions
Aids in rapid logic development
Numerous Google and ICPC coders endorse Codeforces.
5.CodeStudio by Coding Ninjas
Website: https://www.codingninjas.com/studio
Best For: Company-specific questions + Interview preparation
Highlights:
Free curated problem lists
Interview experiences
Resume builder, mock tests
Focused more on Indian product-based companies.
6. HackerRank
Website: https://www.hackerrank.com
Best For: Practice + Companies' hiring rounds
Highlights:
Functional programming, regex, AI, and more
Company-based hiring tests
Earn certificates
Amazon, Goldman Sachs, Adobe utilize HackerRank in their hiring processes.
7. NeetCode
Website: https://neetcode.io/
Best For: LeetCode curated questions with video solutions
Highlights:
Roadmap to LeetCode
150 Essential DSA problems
Free + Premium options
Best starter kit for FAANG preparation via the LeetCode path.
8. AlgoExpert (Paid)
Website: https://www.algoexpert.io
Best For: Paid preparation with video explanations
Highlights:
190+ questions with premium solutions
System Design preparation included
Coding interview crash course
Utilized by many serious FAANG aspirants (recommended with discipline).
9. CS Dojo (YouTube)
Channel: https://www.youtube.com/c/CSDojo
Best For: Beginner-friendly explanations on DSA topics
Highlights:
Clear visuals
Real coding walkthroughs
Basic to intermediate level content
Excellent for those who learn better through visual content.
10. Striver’s SDE Sheet
GitHub: https://takeuforward.org/interviews/strivers-sde-sheet-top-coding-interview-problems/
Best For: DSA revision in 60 days
Highlights:
Hand-picked 180 problems
Cover all major patterns
Utilized by thousands of selected SDEs
Ideal for the last 2–3 months of preparation before interviews.
BONUS: DSA Roadmap for FAANG level Internships in 2025
Month Focus Area Platforms to Use
1 Arrays, Strings, Sorting LeetCode, GFG
2 HashMaps, Stacks, Queues NeetCode, InterviewBit
3 Trees, Graphs Codeforces, GFG
4 DP, Recursion LeetCode + YouTube (Aditya Verma)
5 Mock Interviews + Sheets Striver + InterviewBit
BONUS: DSA Roadmap for FAANG Internships
Month Focus Area Platforms to Use
1 Arrays, Strings, Sorting LeetCode, GFG
2 HashMaps, Stacks, Queues NeetCode, InterviewBit
3 Trees, Graphs Codeforces, GFG
4 DP, Recursion LeetCode + YouTube (Aditya Verma)
5 Mock Interviews + Sheets Striver + InterviewBit
Final Tips to Crack FAANG Internships with DSA
- Track your progress daily
- Learn patterns, not just questions
- Join contests to improve timing
- Maintain a GitHub profile with solved problems
- Do mock interviews with friends or on platforms like Pramp