CS Foundations & Interview PrepIntermediate8 modules~4.0 hours hands-on3 learning modes
The Coding Interview Loop
Practice the complete coding-interview workflow: clarify the problem, establish contracts, derive and improve a solution aloud, test it deliberately, and perform realistic timed mocks.
// What you'll be able to do- Understand the signals interviewers evaluate
- Turn ambiguity into examples, constraints, and invariants
- Produce a correct baseline and improve it transparently
- Narrate decisions without drowning the signal
8 modules, built to run
Every module ships runnable code. Expand any one to see what's inside.
00IntroductionPractice the interview process, not only the final answer30 min
Questions this module answers
- What should you know about why a correct final answer is only one interview signal?
- How do you choose the practice mode that best exposes your current gaps?
Start moduleFree preview
01The Interview ContractUnderstand the signals interviewers evaluate30 min
Questions this module answers
- What distinguishes correctness from the other interview signals?
- How do you create a reusable scorecard contract?
02Clarify Before You CodeTurn ambiguity into examples, constraints, and invariants30 min
Questions this module answers
- How do you restate an ambiguous problem without changing its meaning?
- How do you elicit constraints and discriminating examples?
03From Brute Force to BetterProduce a correct baseline and improve it transparently30 min
Questions this module answers
- How do you implement a correct brute-force baseline?
- How do you validate equivalence and explain complexity aloud?
04Communicate the Trade-offsNarrate decisions without drowning the signal30 min
Questions this module answers
- How do you narrate an invariant and complexity concisely?
- How do you reject alternatives with evidence?
05Test and Debug DeliberatelyDesign edge cases and recover from mistakes calmly30 min
Questions this module answers
- How do you build a test matrix from contracts?
- How do you trace state before executing?
06Timed Mock InterviewsRun realistic easy, medium, and follow-up rounds30 min
Questions this module answers
- How do you allocate time across a complete interview loop?
- How do you solve easy and medium prompts under explicit constraints?
07Pattern SynthesisExecute a repeatable interview loop from prompt to proof30 min
Questions this module answers
- How do you select a pattern from constraints rather than keywords?
- How do you score evidence and plan targeted practice?
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