About Rubduck

Rubduck is an AI mock interviewer built for software engineers. It simulates real technical interviews — you talk through your thinking while you code, and the AI pushes back, asks follow-ups, and tells you exactly where you fell short.

What you can practice

Rubduck covers the full interview loop: GenAI system design, coding, system design, AI/ML design, and behavioral interviews. Every session ends with a detailed scorecard — not just a pass/fail, but specific feedback on communication, depth of reasoning, and where your answer broke down.

Why spoken-first?

Most interview prep tools test what you know. Rubduck tests how you communicate what you know — which is what interviews actually evaluate. Writing correct code in silence won't get you the job. Explaining your tradeoffs clearly will.

Why Rubduck?

The name comes from rubber duck debugging — the practice of explaining a problem out loud to find the answer yourself. Programmers have known for decades that talking through a problem is one of the most effective ways to solve it. We gave the duck a brain, a voice, and a very high bar for what counts as a good answer.

Get in Touch

Have questions, feedback, or just want to say hi? Reach out at [email protected].