1. You get a broken system
A real project with a bug, a slow part, or unsafe code.
Interview prep
Practice real engineering work before your interview
You work on real broken systems — databases, Rust code, smart contracts, infrastructure. You find the problem, fix it, and get a score. So you know you're ready before the interview, not during it.
Real systems and real fixes — not quiz questions.
How it works
Most interview prep is quizzes. This is the real work.
Instead of answering questions, you get a real system that is broken or slow. You fix it, and automatic checks tell you if your fix is correct.
2. You fix it
Find the cause, fix it, and make the system work better.
3. You get a score
Automatic checks grade your fix. The same fix always gets the same score.
Pick a lab → start a scenario → find the problem → fix it → pass the checks
What you can practice
Pick what matches your interview
PostgreSQL
Slow queries, locks, replication problems, bad indexes and other real database failures.
Practice PostgreSQL →Rust
Make real Rust code faster and more reliable — threads, async, latency and throughput.
Practice Rust →Solidity
Fix unsafe smart contracts: access control, wrong accounting and edge cases.
Practice Solidity →Kubernetes
Fix common infrastructure problems: bad rollouts, failing health checks and overloaded services.
Practice Kubernetes →
Example
A Rust service that is too slow
The service is slow and times out when many users hit it at once. Your job: find why, make it faster, add logging, and prove it got better. The checks do the grading.
What you see
- p95 latency: 1800ms
- Timeouts under load
- Background tasks block shutdown
- No logging to debug with
What you need to do
- Get p95 under 300ms
- Keep the results correct
- Add useful logging
- Pass all performance checks
How it's scored
- Finding the cause25%
- Correct results25%
- Faster service25%
- Clean code15%
- Logging10%
What you get better at
The skills interviewers look for
Interviewers want to see how you think — how you find a problem, fix it, and explain your choices. That is what you practice here.
Find the root causeReason about performanceDebug production systemsUnderstand database behaviorWork with concurrency & asyncWrite safe, correct codeExplain trade-offsMake good system decisions
FAQ
Common questions
Is this like LeetCode?
No. You don't answer puzzle questions. You fix real systems — databases, code, contracts and infrastructure.
Do I need production experience?
No. Each scenario teaches you, step by step, how real systems behave and break.
How is my work checked?
Automatically. Each scenario has clear pass/fail checks, so the same fix always gets the same score.
Does this guarantee a job?
No. It helps you practice and improve. It does not guarantee an offer.
Get ready for your interview
Interview prep is part of the Individual plan — $499 per year, with every lab and scenario included.