Is it really free to start?

Yes. 3 warm-up labs, email signup, no card. They do not expire, and you get a basic report on every one.

Is Practice a subscription?

No. You buy a pack of labs once. They sit on your account until you run them, there is no clock and nothing auto-renews.

Can I use AI while I practice?

Yes, and you should. The report grades how you used it: whether you gave it the right context, caught a wrong suggestion, and verified before applying. That is a skill worth practising.

A company invited me to an interview. Will I see my result?

No. When a hiring team sends the invite, the report goes to that team only. You can ask them for feedback, but sharing it is their call. Labs you run on your own plan are separate, and those reports are always yours.

Does practising here show up to employers?

No. Your practice history is yours. A company that invites you to an interview sees that session and nothing else about your account.

Do I get the solution?

After your attempt, yes. Failing a lab and then reading exactly what you missed is most of the value.

For engineers

Practice on infrastructure that is actually broken.

A live Kubernetes, Docker, Linux or Terraform environment, a genuine fault, and no title telling you what it is. Fix it in a browser terminal, then read a report on how you actually debugged it. Three labs are free.

Start free See pricing ▸

3 warm-up labs free · no card · nothing expires

Why this is different from reading another guide

Reading a guide is not practice

You can read every CrashLoopBackOff article on the internet and still freeze when the cluster is yours and the clock is running. The gap is not knowledge, it is doing it under pressure without knowing what broke.

Nobody tells you what is wrong

Tutorials hand you the fault in the title. Here you get a symptom and a broken system, which is exactly what an incident looks like and exactly what an interview should.

You find out how you actually debug

The report names your first hypothesis, how long it took, the dead ends you entered, and what you broke on the way. Most engineers have never seen their own debugging described back to them.

It is the same lab a company would send you

Practice labs come from the same library hiring teams interview on. Not a simplified version, the real one.

How a lab works

Pick a lab

Filter 120+ labs by stack and difficulty: Kubernetes, Docker, Linux, Terraform, monitoring. Start on easy if you have never done this.

Fix it in the browser

A real environment with a real fault, in a browser terminal. Nothing to install. Google it, ask an AI, take the time box. All allowed.

Read your report

Diagnosis quality, time to first correct hypothesis, blast radius, how well you drove your AI. Then the solution, so you learn the fault you missed.

You get the same report a hiring team would

Most practice platforms tell you pass or fail and leave you to guess what that says about you. The warm-up labs give you the outline: result, timing, and where you lost the most ground. On a lab pack the full AI report opens up, the one a hiring team reads, naming the hypothesis you chased first, the dead end you got stuck in, and the liveness probe you forgot to turn back on.

Then it shows you the solution, so the lab you failed is the one you remember.

your report

scenario: broken-etcd            FAIL at 45m
──────────────────────────────────────────────────
diagnosis        partial
                 checked disk and memory first,
                 lost 18m before reading etcd logs
blast radius     clean
                 nothing deleted, no probes disabled
ai usage         passive
                 pasted the error, applied the first
                 suggestion without verifying
what you missed  peer cert expired 3 days ago
                 → etcdctl endpoint health would
                   have shown it in 30 seconds

Free to start

3 warm-up labs are free, and you get a report on every one. After that you buy a pack of labs, with the full AI report on each, and the labs never expire: no subscription, no auto-renew, no clock running down while you are busy at work.

If a company invited you to an interview, you pay nothing. They cover it.

Start free Full pricing ▸

Questions from candidates

Is it really free to start?: Yes. 3 warm-up labs, email signup, no card. They do not expire, and you get a basic report on every one.
Is Practice a subscription?: No. You buy a pack of labs once. They sit on your account until you run them, there is no clock and nothing auto-renews.
Can I use AI while I practice?: Yes, and you should. The report grades how you used it: whether you gave it the right context, caught a wrong suggestion, and verified before applying. That is a skill worth practising.
A company invited me to an interview. Will I see my result?: No. When a hiring team sends the invite, the report goes to that team only. You can ask them for feedback, but sharing it is their call. Labs you run on your own plan are separate, and those reports are always yours.
Does practising here show up to employers?: No. Your practice history is yours. A company that invites you to an interview sees that session and nothing else about your account.
Do I get the solution?: After your attempt, yes. Failing a lab and then reading exactly what you missed is most of the value.
Student or unemployed discount?: Email us.

The box is faulty. Want in?

Private beta. Engineers get 3 free practice labs at launch, early scenarios before public release, and every report stays theirs.