Pricing
Self-paced prep starts free. Upgrade when you want the medium and hard pads that look like the onsite — or book a live review with the author.
Self-paced prep: easy pads, the question bank, and every guide.
$0/mo
Forever free
Most people start here
Unlock medium and hard pads — the ones that look like the screen.
$12/mo
Billed monthly
Pro access plus a live 1:1 review with the person who writes the guides.
from $150
One-time booking
Original bank, not paywalled
3 free · 57 in Pro
One problem list, filter by role
One membership. The same pads and articles — not a separate video library glued on later.
310+ questions
SQL, modeling, orchestration, warehouses, ML, and behavioral — original prompts, not a leaked exam dump. Drill mode is one question at a time.
60 coding problems
3 easy pads stay free. 28 medium and 29 hard unlock with Pro. Tests run in this tab — no notebook, no warehouse account.
Mean
Easy · free
def arithmetic_mean(xs):
# Write in NumPy, Python, or PyTorch
return sum(xs) / len(xs)✓ Tests run in this tab
9 roles
A graph per role, ordered problem tracks, and original certification drills. Progress stays on this device.
| Surface | Free | Pro / coaching |
|---|---|---|
| Easy coding problems | Editor, tests, solutions | Editor, tests, solutions |
| Medium and hard coding problems | Locked | Editor, tests, hints, solutions |
| Interview questions | Full bank | Full bank |
| Blog, roadmaps, certs | Yes | Yes |
| 1:1 session | No | Coaching plan only |
Can’t find what you need? Email srinivasa8511@gmail.com
The blog, role roadmaps, interview question bank, certification practice, cheat sheets, the SQL sandbox, and every easy coding problem. You can learn the grain of the warehouse without a card.
Medium and hard coding problems (57 pads today): the editor, tests, hints, and reference solutions. Easy problems stay free. Interview questions are not paywalled.
Stripe Payment Links when those URLs are configured. After checkout, Stripe should return you to /settings/?upgraded=pro so this browser can mark the plan. Until a link is set, email us.
Yes. Cancel from Stripe’s customer portal or by emailing us. Access stays through the period you paid for — you are not locked in beyond that.
No. It is a one-session booking. Price starts at $150. Coaching includes Pro access on this device after you book.
Analyst, BI, analytics engineer, data engineer, data scientist, ML engineer, MLOps, AI engineer, and architect. Filter the problem list by role — one list, every role.
Monthly is the most flexible. Annual is charged upfront at $99 (about $8.25/mo) and saves two months versus paying $12 each month. Features are the same.
A browser editor for SQL (SQLite in this tab) and Python (NumPy, plain Python, or PyTorch via Pyodide). Write code, run tests, and study the reference solution once the pad is unlocked.
Start with easy pads for free. Upgrade when you want the medium and hard set that matches a real screen.