01 · DAILY DRILL
Questions that adapt to you
Multiple choice, flashcards and explain-it questions, pitched at your level and mixed with reviews of what you missed.
● Quant · HFT · Systems interviews
Know Your Sh*t
Top quant and infra teams don’t just test your LeetCode. They want to see if you know your sh*t.
You’re in. on the list.
One email when it launches. No spam.
9 tracks550+ questions5 min a day
550+Fact-checked questions
9Tracks, systems to ML
5 minA day, adaptive
L1→L4Warm-up to cracked
How it works
Five minutes. Every day.
AI writes the code now. Interviewers still ask what a page fault is. Know Your Sh*t drills the knowledge round, the part LeetCode never covers.
02 · GET GRADED
Know exactly why
Every answer comes with a plain-English explainer and a deep dive. Write or speak explain answers and get graded against an interviewer’s rubric.
03 · CLIMB THE BOARD
Streaks, XP, rankings
Per-topic skill ratings tell you where you’re weak. A weekly leaderboard tells you where you stand.
Try one
Do you actually know?
The questions that decide systems-heavy interviews: memory, isolation levels, TCP, inference bottlenecks. Real mechanisms, no trivia, no fluff.
SYSSample question
Tracks
The deep end, organized.
Nine tracks written for quant, HFT and infrastructure loops. Every question fact-checked before it ships.
SYS
Systems
Virtual memory, scheduling, syscalls, page cache
C++
C++ & Low Latency
Memory model, atomics, cache lines, SIMD
NET
Networking
TCP internals, TLS, QUIC, kernel bypass
DB
Databases
Storage engines, isolation, MVCC, replication
DS
Distributed Systems
Raft, consistency, clocks, CRDTs
ML
ML Systems & Inference
KV cache, batching, MoE, GPU kernels
INF
Infrastructure
Streaming, caching, orchestration
FS
Full-Stack (Deep)
Event loop, HTTP caching, auth, realtime
SD
System Design
Interview · Pro
Live rooms
Play live with friends.
Spin up a room, share the code, and race your study group through the same questions on the same clock.
- Fastest right answer wins. Points for being correct, bonus for being quick.
- Pick any track or topic. 5 to 15 questions, 10 to 30 seconds each.
- Live standings after every question, podium at the end.
Inside the app
Monochrome. Fast. No fluff.
Everything included
Built for the knowledge round.
Adaptive drills
Difficulty follows your per-topic skill rating, from L1 warm-ups to L4 cracked.
Explain it, out loud
Type or speak your answer like you would in the room. AI grades it against the rubric.
Streaks & leaderboard
XP, streak freezes and a weekly board that resets every Monday.
Live rooms
Kahoot-style games for your study group, on any track or topic.
Placement test
A two-minute adaptive test sets your starting level per track. Or start from zero.
Spaced review
Everything you miss comes back right before you’d forget it.
Everyone’s cooked. Except you.
Get on the list and be first in when Know Your Sh*t launches on iOS.
You’re in. on the list.
One email when it launches. No spam.