# I Finally Finished My AI Interview Coach (It Only Took Me Getting Rejected to Care)

> Source: <https://dev.to/thyalpha001/from-hackathon-prototype-to-production-app-how-i-finished-my-ai-interview-coach-4aob>
> Published: 2026-06-03 12:38:12+00:00

*This is a submission for the GitHub Finish-Up-A-Thon Challenge*

An AI interview coach that runs in your browser. No backend. No accounts. No subscriptions. You bring a free API key, paste your resume and the job description, pick a mode (behavioral, technical, system design, whatever), and it runs a full mock interview. Asks follow-ups, scores you on 5 dimensions, gives you a study plan at the end. I built the first version for the Gemma 4 DEV.to Challenge last month. It kinda worked. But I wouldn't have used it myself, and that bothered me. **Live:** [hajirufai.github.io/gemma4-interview-coach](https://hajirufai.github.io/gemma4-interview-coach/)

**Repo:** [github.com/hajirufai/gemma4-interview-coach](https://github.com/hajirufai/gemma4-interview-coach)

```
Before After
Lines of code 792 1,367
AI providers 1 4
Voice support Nope Mic + speaker
Error recovery Pray Auto-retry + backoff
API validation Nope Test button
Default model 12B 31B
Crash rate in sessions ~30% ~2%
```

I'll be honest about where Copilot carried its weight and where I turned it off. **Where it saved me real time:**

The Speech Recognition API has a bunch of browser-prefix nonsense (`webkitSpeechRecognition`

vs `SpeechRecognition`

). I typed `function initVoiceInput`

and Copilot filled in the whole setup — event handlers, interim results, confidence thresholds. I tweaked the auto-stop timing and UI hooks, but the boilerplate was right on first try. Same story with the multi-provider fetch calls. After writing the Google AI Studio integration, Copilot predicted the OpenRouter request format almost perfectly when I started the next function. Just needed to adjust a couple headers. And CSS animations — the mic pulse effect, dark mode transitions, the glass morphism stuff. Copilot's suggestions were honestly better than what I'd write by hand. It knows the modern patterns. The retry-with-backoff logic was another clean one. I typed `async function callWithRetry`

and got exponential backoff with proper error classification (retry 500s, fail fast on 401s) without spelling it out. **Where I ignored Copilot completely:**

System prompts. The interview coach personality, scoring rubric, how it gives feedback — that needed careful thinking about what makes a good mock interview. Copilot's suggestions were generic motivational speaker stuff. Not useful. Session flow decisions too. When to show the mid-session scorecard, how to handle conversation context across questions, when to auto-scroll — these need design thinking, not autocomplete. **My honest take:** Copilot didn't write this app. But it cut out maybe 40% of the typing on the parts where I already knew what I wanted. The activation energy to *come back* to an old project is the hardest part. Having Copilot handle the boring bits meant I could focus on the decisions that actually mattered. ---

Try it: [hajirufai.github.io/gemma4-interview-coach](https://hajirufai.github.io/gemma4-interview-coach/). All you need is a free key from [Google AI Studio](https://aistudio.google.com/apikey) — takes 30 seconds. If you're prepping for interviews, give the voice mode a shot. Talking through answers out loud is a completely different experience than typing them. Let me know which mode you found most useful 👇