Curated sheets, not random grinding
Blind 75, NeetCode 150, Striver's SDE and more — ordered by concept, difficulty-ramped, built the way interviews actually test you.
Arrays12
Two Pointers9
Sliding Window8
Stack7
Binary Search10
Graphs14
Self-hosted Judge0 Voice AI interviews SM-2 revision
Solve. Get judged.
Get interviewed.
Remember all of it.
BaseCase runs your code on a self-hosted Judge0, schedules revisions with SM-2, and puts you in front of a voice AI interviewer that asks follow-ups. Curated sheets decide what you solve next.
- Problems
- 121+ problems
- Sheets
- 6 curated sheets
- Engineers
- 317+ engineers
- Pricing
- ₹0 to start
basecase › sheets1/5
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6 sheets · 3 tracks in progress
Curated sheets, in the right order
Blind 75, NeetCode 150, Striver — concept-ordered and difficulty-ramped.
500+ problems across 20+ topics
Streaks that build real habits
Curated sheets for every interview track
Arrays → Graphs → DP, every pattern covered
Spaced-repetition revision queue
AI mock interviews with voice
Problems tagged by company & difficulty
In-browser editor, instant verdicts
Why BaseCase
Everything you need to go from tutorial hell to offer.
Not another list of problems. A system that decides what you practice next, checks your code, and interviews you — so every session compounds.
Code in the browser
Monaco editor, multiple languages, custom test cases and sub-second verdicts.
const lo = 0, hi = n - 1; while (lo <= hi) { const mid = (lo + hi) >> 1; } ✓ 24/24 tests passed · 3 ms
AI interviewer that pushes back
Voice-first mock interviews. It asks follow-ups, probes edge cases and scores confidence, depth and communication.
What's the time complexity, and can you handle duplicates?
O(n) with a hash map — duplicates are fine since I store indices…
Spaced repetition
Mark your confidence after each solve; problems come back exactly when you're about to forget them.
Streaks, badges & leaderboard
Consistency beats intensity. Show up daily, climb the board, and keep the momentum visible.
Top 1%
of learners finish a full sheet in under 60 days with the revision queue on.
Problem library
Browse all 121+ problems Every pattern. Learned through practice.
A library built around how patterns actually show up in interviews — so solving one problem teaches you to solve ten.
Curated sheets
Stop grinding randomly. Follow a proven path.
Every sheet is a complete learning track — ordered by concept, difficulty-ramped, and built around how interviews actually test you.
Most popular tracks
AI interview practice
Practice like it's the real thing.
Our AI interviewer runs a full technical round — asking follow-ups, testing edge cases and giving you a detailed report the moment you finish.
Adaptive questions
Difficulty and follow-ups adjust to how you answer.
Voice-first
Speak your approach out loud — exactly like the real thing.
Scored report
Confidence, depth, communication and a per-question breakdown.
Mock interview · Google · SDE-2 Live
AI
Let's start with a classic. Given an array of integers, find two numbers that add up to a target. What's your approach?
I'd use a hash map to store values as I iterate. For each number I check whether the complement exists…
YouAI
Good. What's the time and space complexity? And what if the array is sorted — can you do better on space?
Listening…12:34
How it works
Four steps. One compounding loop.
- 01
Pick a sheet
Choose a track that matches your target — Blind 75 for a quick loop, Striver for depth.
- 02
Solve in the browser
Write, run and submit against real test cases. Stuck? Ask the AI mentor for a nudge, not the answer.
- 03
Rate your confidence
One click after every solve. The revision queue brings it back right before you'd forget it.
- 04
Interview with AI
Run a voice mock interview, get a scored report, and fix the gaps before the real round.
From the community
Thousands of engineers. One goal.
The revision queue is the feature I didn't know I needed. Problems I'd forgotten came back right on time.
Priya S.
SDE-2 · Fintech
Did 30 AI mock interviews before my loop. The follow-up questions were brutal in the best way.
Rahul M.
Backend Engineer
Finished Blind 75 in six weeks with the streak system. First time I've stuck with anything this long.
Ananya K.
Final-year student
Your next interview
starts here.
Every engineer you admire solved the same problems you're avoiding. One problem. One pattern. One step closer.