Technical interviews are stressful. I wanted to build a "copilot" that could listen to my interviews and flash relevant talking points from my own resume in real-time, without covering my entire screen. Here is how I built InterviewHUD using the modern web stack.
The Challenge: The "Always On Top" Overlay The biggest hurdle was creating a transparent window that stays on top of Zoom/Teams but lets you click through it (so you can still interact with the meeting). In Electron, setting transparent: true and alwaysOnTop: true gets you halfway there. But managing the "click-through" behavior required toggling win.setIgnoreMouseEvents(true) dynamically based on user interaction.
The Brain: Gemini 2.0 Flash I needed speed. The older models had 3-5s latency—too slow for a conversation. Gemini 2.0 Flash via WebSocket brought this down to <2s. I implemented a RAG (Retrieval-Augmented Generation) pipeline entirely on the client-side. The app parses the user's Resume, chunks it, and when a question comes in, it finds the relevant "story" to tell.
Privacy Architecture (BYOK) I didn't want to store anyone's audio. I built it as a "Bring Your Own Key" app. The audio stream goes from the user's local machine directly to Google's API. No middleman server.
Conclusion It started as a tool to help me not "blank out" due to anxiety, and now it's a full product. If you are curious, I wrote this in TypeScript/React.
PS: If you want to try it for your next interview, I'm running a launch promo ($39) at interviewhud.com.
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