№ 03Build it, then explain it
Technical interview lab
Solve coding exercises in a JavaScript or Python sandbox that runs in your browser with public tests, and sketch architectures on a system-design whiteboard.
Free during early access. You’ll be asked to sign in first.
What’s includedTechnical lab
- 01JavaScript and Python run in an in-browser sandbox, with nothing to install.
- 02Run public test cases and compare expected with actual output.
- 03A system-design whiteboard for components and the connections between them.
- 04Save drafts, then discuss your solution with the interviewer.
01Workflow
How it works
- 01
Pick an exercise
Choose a coding exercise and a language. Clarify inputs and edge cases before you write code.
- 02
Run the tests
Execute your solution against public tests in the browser and iterate until it passes.
- 03
Explain the trade-offs
Take the solution to the interviewer and defend its complexity and design choices.
02Works well with
Keep building the habit.
- 014 interviewersR1–R3Text · voice
Conversational AI mock interviews
A realistic three-round mock interview with an AI interviewer who follows up on your answers, your resume, the job description and your target company.
- 02Realtime15–60 min
Live voice interview studio
Talk with an AI interviewer in real time and interrupt naturally. For real calls, a meeting coach shows silent structure hints — never scripted answers.
- 04PaceFillers · pauses
Speaking practice & delivery feedback
Record a spoken answer and see estimated words per minute, possible filler phrases and pauses, transcribed with Fish Audio speech recognition.
Early access · free
Log your first rep today.
Bring a resume or a job description — or just the role you want. The log starts with your first answer.