Voice-first Practice Coach
Tap the mic, say the question, and the answer appears in place, with why that answer works and the key phrases to hit.
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CASE STUDYBUILT 2026In beta testing
AI interview coach
Intervatar
An AI interview coach: say your question out loud and the app answers with your own material (resume, job description and STAR stories), in several lengths, plus a blacked-out copilot for the real interview.
CONTEXT
The challenge
Job seekers walk into interviews with the information in their head but not the words. Their resume, the job description and their stories had to become answers ready to say out loud, in seconds, and the app had to stay with them during the real interview: on screen, without the glow giving away that they are reading.
APPROACH
The solution
A React Native/Expo app for iOS and Android on top of a Python backend. Speech is transcribed with Deepgram and answers are generated through model routing via OpenRouter, always grounded in the context the user loaded. The interface is dark-only and OLED-first (true black and gold), designed to be used while nervous and under pressure, with a Pro subscription on in-app purchases verified server-side.
WHAT IT DOES
Key features
Answers that fit the moment
The same story as a 30s or 60s reply, an executive or technical version, or in STAR format, depending on the interview.
Your digital twin
Resume, job description and STAR stories as the base of every answer: nothing invented outside your own material.
Scored mock interviews
Mock interviews and voice practice with personalized questions, coaching feedback and a performance review.
Zero-Glow Live CoPilot
A true-black HUD for the real interview, lighting the fewest pixels possible so the screen does not reflect on your face.
3 free minutes of Pro
Instead of a multi-day trial, each account gets 3 minutes of the full Pro set: the good part, with no card required.
UNDER THE HOOD
Architecture & stack
Expo 53 and React Native with React Navigation and Reanimated, on a Python REST API deployed to Railway. Deepgram for speech-to-text, OpenRouter for model routing, in-app purchases with expo-iap verified against the App Store and Google Play from the server, and full i18n (English and Spanish) with react-i18next and device language detection.
React NativeExpoTypeScriptReact NavigationReanimatedPythonOpenRouterDeepgramexpo-iapi18next
RESULT
In beta testing (TestFlight and a closed Google Play track) while the public launch is prepared, with the whole product working end to end: onboarding, digital twin, voice practice and subscription.
Let’s talk about your projectCONSULTING
When you need judgment,
not just code.
More than a decade shipping product across web, mobile and AI left me something more valuable than a stack: judgment. If your team is stuck on a technical decision, evaluating a stack, or wants a second opinion before sinking months into a direction, let's talk.
