LeetDuck: LeetCode on Steroids
AI Mock Interviewer Chrome Extension for LeetCode
1 follower
AI Mock Interviewer Chrome Extension for LeetCode
1 follower
I realized that grinding thousands of LeetCode problems doesn't prepare you for the hardest part of the technical interview: thinking out loud. So I built LeetDuck, a Chrome extension that turns your daily LeetCode practice into a realistic mock interview. Used by 180+ developers and counting! Posted it to r/leetcode and it did well, so decided to try my luck on here! Try it out at https://leetduck.com! and feel free to join the discord: https://discord.gg/SwMa7AwnAj as well!
I failed a FAANG final round interview last year despite knowing the optimal solution because I couldn’t “think aloud” clearly while coding.
Even though I practiced hundreds of leetcode problems and knew the optimal solution, I kept stumbling over my words, and ultimately didn't get an offer even though I solved the problem.
That experience made me realize that vocalizing your thinking is a huge part of technical interviews that normal LeetCode practice simply doesn’t train.
So I decided to build LeetDuck.com — a Chrome extension that integrates directly into LeetCode and turns your daily practice into more realistic interview prep using voice-to-voice AI.
It sits on your leetcode problem screen as a small “rubber duck” and is automatically configured to:
* Ask you a random behavioral question at the start of each problem
* React to your runs and submits in real time
* Prompt you to explain your solution, then ask about time and space complexity when you finish
On top of that, your spoken explanations and code ideation are graded based on transcripts from real FAANG interviews — many companies publish examples of what candidates should and shouldn’t do in technical interviews. LeetDuck gives structured feedback on your communication and problem-solving clarity.
I’m already using it for my upcoming interviews (I’m a junior recruiting for SWE), and it’s been the first thing that’s actually made me feel comfortable explaining my ideas under pressure.
Would love to hear what you all think – is this something you’d use too?