Copy Success Cases.Go at your own pace.
The platform
One system, not five open tabs
A roadmap, a rubric grader, and a sandboxed interview runner — all pointed at the same skill.
Career Paths
Ordered tracks — Foundations, Git & GitHub, Quant Developer Interview Prep. Each node is one skill, scoped small enough to finish.
Real sandboxed executionMock Interviews
Implement a real concurrency primitive against a hidden test suite. Graded review the moment you finish.
LLM-graded, instant feedbackExplain Mode
Explain a concept in your own words and get it graded against a rubric. The fastest way to find the gap you didn't know you had.
Earned, not purchasedCertificates
Finish a track, get a shareable certificate backed by your real completion data.
The problem
Most prep stalls in the same four places.
Tutorial hell
Another 12-hour course finished, another blank page when it's time to build from scratch. Watching isn't doing.
No idea what's next
A hundred open tabs and no order between them. Learning without a sequence goes nowhere in particular.
Interview prep stuck on syntax
Real rounds test whether you can reason under pressure. Most prep stops at "does the code run."
Nothing to show for it
Months of study and nothing a hiring manager can open. No repo, no certificate, no evidence.
Inside the product
These are the actual screens
Career Paths
Ordered tracks, scoped nodes
Foundations through Quant Developer Interview Prep. You always know what to open next, and every node ends in something you shipped.
Your career paths
Foundations
From zero to a small, finished project you can talk about.
Git & GitHub
Version control and a visible, real commit history.
Quant Developer Interview Prep
Implementation-first quant interview prep.
Mock Interviews
Hidden tests, sandboxed, graded
Build the Primitive drops you into a real concurrency problem with a hidden test suite and sandboxed execution. Same pressure as a technical screen, plus a graded review at the end.
Thread-Safe Counter
class ThreadSafeCounter:
def increment(self):
with self._lock:
self._value += 1
All tests passed
- ✓ single thread
- ✓ concurrent increments
- ✓ value does not mutate
How it works
Learn, Do, Check, Ship — on every node
Skip to Learn every time and you get a tutorial pile, not an offer.
Learn
One concept, explained short. Not a 40-video playlist you abandon on episode three.
Do
Use it on a small, real task the same day. Reading it and using it are different skills.
Check
Grade yourself against a written standard, not the feeling of having watched something.
Ship
Push it somewhere public — repo, README, portfolio. That artifact is what you send a recruiter.
Learn it as a game
Walk the world, open a lesson, beat the enemy
The Foundations roadmap is also a game. Move through the world, open the same lesson you'd read in the list, then answer questions to damage what's in front of you. Same lessons, same progress.
Stop collecting tutorials. Start shipping evidence.
Roadmaps built by engineers from Microsoft, Google and Jane Street. Free to start, no account needed. No guaranteed jobs.