Interview Simulator AI

AI interview practice for job seekers. Realistic sessions, AI questions, instant feedback. Build confidence, ace interviews. Quick text or live AI conversations. Land your dream job.

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Interview Simulator AI

Overview

Core Product: Interview Simulator AI is a web-based platform that helps users prepare for job interviews using AI-generated questions, real-time feedback, and voice-based practice sessions.

Product: Web App
Market Type: B2C
Technologies: React, Supabase, GPT-4, ElevenLabs, Tavus, Netlify
Team: Bolt coders since 2024, James is seasoned founder Y Combinator alumni, Jose is the CEO of brandvirality, expert on marketing, growth the user base into 300k users in 4 months.

The Problem: Many job seekers struggle with anxiety, lack of real-time feedback, or limited opportunities to practice interviews in a realistic setting. Traditional mock interviews are often inaccessible or unscalable.

Solution: Interview Simulator AI creates an immersive, voice-enabled simulation environment where users can practice interviews with realistic AI video agents and receive instant feedback—improving confidence and performance.

Market Validation:

  • 92% of hiring managers say interview performance is the most important part of the hiring process
  • 60%+ of applicants report feeling nervous or unprepared before interviews
  • Career prep industry is worth over $20B globally

Core Selling Points:

  • Voice and video AI simulate real-life pressure and pacing
  • Feedback is instant, private, and tailored
  • Use Tavus to bring real-time AI video agents for interview practice

Talking Points:

  • Anyone can be a great candidate—if they practice right
  • Most people fail not due to lack of skills, but lack of interview experience
  • Realistic simulations improve performance faster than reading guides

Audiences:

  • College students and new grads
  • Career switchers
  • Developers prepping for tech interviews
  • Professionals reentering the workforce

Top 3 Features:

  • Quick Practice Mode (Shy-Friendly): A text-based simulation where users receive one AI-generated question at a time. Users respond by recording their voice, and the system analyzes both content and vocal delivery—perfect for introverts or private practice. Powered by ElevenLabs and GPT4.

  • Live Interview Mode (Real-Time AI): A dynamic, face-to-face mock interview experience powered by Tavus and GPT4. The AI video agent asks follow-up questions based on user responses and offers live feedback on clarity, confidence, and content.

  • Instant AI Feedback Engine: After each response, GPT-4 delivers personalized coaching—highlighting filler words, evaluating tone, and offering tailored improvement tips to build real-world interview confidence.

Inspiration

The idea came after I bombed an interview for my dream job—not because I didn’t know the answers, but because I was too nervous to deliver them well. I realized practice, not preparation, was the missing piece. This tool is the one I wish I had.

What it does

Interview Simulator AI helps users prepare for job interviews by simulating real-world scenarios with AI-powered tools. It offers two modes:

  • Quick Practice Mode: A self-paced, question-by-question practice environment where users speak their answers aloud. The AI analyzes both content and delivery, offering instant coaching and confidence tips.

  • Live Interview Mode: A fully interactive, real-time interview simulation with a Tavus-powered AI video agent. Users respond naturally as if in a real interview, while the system provides dynamic follow-up questions and personalized, voice-aware feedback.

Across both modes, GPT-4 and Tavus.io evaluates your answers for clarity, structure, and delivery—turning each session into a coaching opportunity.

Features

  • Two Practice Modes: Whether you're an introvert or thrive under pressure, choose between Quick Practice (text + voice, one question at a time) or Live Interview (real-time AI video conversation).

  • AI-Powered Questions & Feedback: Every interview is unique. GPT-4 generates realistic, role-specific questions and gives detailed coaching after each response—what you said, how you said it, and how to improve.

  • Voice + Video Intelligence: We use ElevenLabs for vocal analysis and Tavus for real-time AI video agents. The result? Simulated interviews that feel surprisingly real and helpful.

  • Real-Time Feedback Engine: Immediately after answering, get insights on tone, clarity, filler words, and pacing—like a personal coach, minus the pressure.

  • Private and Accessible: Practice at your own pace, from any device. Your sessions stay private, and the experience works even if you're not “camera ready.”

  • Designed for Confidence Building: The entire UX is crafted to reduce anxiety—clean design, step-by-step progress, and encouraging feedback.

How We Built It

Main Technologies: React, Supabase, GPT-4, ElevenLabs, Tavus

Technology Stack

  • Frontend: React 18 with TypeScript and Tailwind for responsive UI
  • Voice AI: ElevenLabs for high-fidelity speech synthesis and speech-to-text
  • AI Integration: GPT-4 for dynamic question generation and feedback
  • Video AI: Tavus to deliver realistic, on-screen AI video agents
  • Backend: Supabase for auth, DB, and real-time data sync
  • Infrastructure: Serverless edge functions for low-latency AI tasks
  • Hosting: Netlify for deployment and hosting.

How We Built It

We designed a modular, scalable web app to deliver both live and async interview practice:

  • Quick Practice Mode:

    • Users record answers to AI-generated questions.
    • ElevenLabs analyzes voice tone, clarity, and delivery.
    • GPT-4 evaluates content and structure, returning personalized coaching.
    • Built with local audio recording, real-time transcription, and instant feedback.

  • Live Interview Mode:

    • Powered entirely by Tavus, which generates a human-like AI interviewer.
    • Handles real-time voice/video input and provides dynamic question follow-ups.
    • Offers feedback on both verbal content and delivery directly in the session.

- Immersive Dashboard: A clean, welcoming interface featuring a personalized intro video that sets the tone—making users feel like they’re stepping into a real interview coaching session.

Challenges We Ran Into

  • Prompt Engineering: Fine-tuning GPT-4 and Tavus.io to simulate helpful yet tough interviewers
  • Homapge: Creating a beautiful homepage with a hero that shows what the app do.

Accomplishments We're Proud Of

  • Built a fully responsive, voice-capable simulation in under a day
  • Created an emotionally safe way to practice interviews privately (I wish I had this before my first interview)
  • Built a beautiful yet simple user interface, using AI crafted Video

What We Learned

  • Voice UX requires a different mindset than traditional UI
  • Define UI styles in the first bolt.new prompt. This guarantees to produce a beautiful style!
  • Meeting/Using Tavus.io is amazing! Never tried before
  • Making apps based on real life issues = high chance of providing real value

What’s Next

  • Add Stripe for receiving payments
  • Add resume and role-based context to tailor interviews
  • After live sessions, provide textual feedback of the interview
  • Support live collaborative mock interviews with peers
  • Mobile version for on-the-go prep
  • Integrate AI coach that helps track progress over time

Challenges We Apply & Why

  • Voice AI Challenge: ElevenLabs for voice synthesis + Speech to Text
  • Conversational AI Video Challenge: Tavus for AI-powered interviewers simulating real dialogue
  • Startup Challenge: Helping millions prep for job interviews using AI agents and Supabase

Built With

  • eact-18
  • elevenlabs
  • openai-gpt-4
  • supabase-(postgresql)
  • supabase-auth
  • supabase-edge-functions-(deno-runtime)
  • tailwind-css
  • tavus
  • typescript
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