Prepin
Ai mock interview platform
Hey IH community! 👋
Just shipped a major update to Prepin - our AI mock interview platform for tech folks. The interview engine has been completely overhauled and now runs 4 LLMs simultaneously:
Core interview engine for technical questions/answers
Real-time emotion tracking to analyze confidence levels
Enhanced text-to-speech & speech-to-text for natural conversation
AI Copilot that provides subtle hints during tough questions
We've also massively improved the post-interview feedback with detailed breakdowns of your technical, communication, and problem-solving skills. Our team spent months curating cultural fit data for 1000+ companies - so now the system can simulate interviews at Google, Meta, Amazon, or your local startup with appropriate company culture questions.
The question bank has grown to over 5,000 technical questions across frontend, backend, devops and system design.
Revenue has grown 34% since these improvements, and users are spending 3x longer in practice sessions. The emotional intelligence feature has been the biggest surprise hit - people love seeing how their confidence fluctuates during different question types!
What's been your experience with AI tools for interview prep? Any features you wish existed but haven't seen yet?
Hey👋 Oleh here, founder of Prepin.ai. I've been building in public for a few months, and today I wanted to share our marketing journey and get your advice on reaching early users.
The Product
Prepin is an AI mock interview platform with a twist: it tracks your emotions in real-time while you practice. Think of it as having a coach who can tell you exactly when you appear nervous or confident during your answers.
Marketing Journey So Far
What worked:
1. Content creation focused on interview anxiety (10k+ views on Medium)
2. Posting before/after emotion tracking visualizations on LinkedIn
3. Direct outreach to career coaches (20% response rate)
4. Reddit posts in r/cscareerquestions and r/jobs (400+ signups)
What didn't work:
1. Generic "AI interview practice" ads (too competitive)
2. Cold emails to universities
3. General social media posts without emotion tracking visuals
Current Strategy
We're focusing on differentiating through our emotion tracking feature:
- Creating video content showing real emotion analysis during interviews
- Building case studies with actual improvement metrics
- Partnering with career coaches who can validate the technology
- Targeting communities where interview anxiety is openly discussed
Looking for Advice
1. How do you market a feature (emotion tracking) that needs to be experienced to be understood?
2. Should we focus on B2C (job seekers) or B2B (career coaches/universities)?
3. Any experience with marketing to anxious job seekers without being predatory?
4. What channels would you explore that we might have missed?
Current Metrics
- 1,200 signups
- 300 active users
- 18% weekly retention
- NPS: 42
- $0 spent on ads
Next Steps
Planning to:
- Launch a free tier focused on emotion tracking only
- Create educational content about non-verbal communication
- Build partnerships with bootcamps
- Develop an affiliate program for career coaches
Would love to hear your thoughts, especially from those who've marketed B2C tools successfully. How would you approach growing this?
Edit: The comments have been incredibly helpful! Based on your feedback, I've started working on a freemium model and reaching out to career counselors. Will post updates!
Hey Indie Hackers! I'm excited to share Prepin, a project born from a simple observation: being great at your job doesn't automatically make you great at interviews.
💡 The Problem I noticed many talented professionals missing out on dream opportunities not because they lacked skills, but because they weren't prepared for the interview itself. Traditional mock interviews with friends or recording yourself just don't cut it - they lack real feedback and the pressure of a real conversation.
🛠 The Solution Prepin is an AI-powered mock interview platform that:
Conducts realistic video interviews
Provides instant, actionable feedback
Adapts questions to your industry and experience
Tracks your progress over time
Lets you practice unlimited times
🎯 Current Status
Launched beta version
500+ practice interviews conducted
4.8/5 average user rating
Growing user base in tech, finance, and consulting
🔍 Tech Stack:
React + Vite
Node.js
GPT-4 API
WebRTC for video
Custom emotion analysis
💭 Next Steps We're focusing on:
Expanding industry-specific question banks
Enhancing feedback algorithms
Building interview preparation roadmaps
Adding collaborative features
Would love to hear your thoughts and feedback! Has anyone else tackled the interview preparation space? What challenges did you face?
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Congrats with launching!
Could you provide more details what exact data the Prepin is collecting from the user and how it generates the feedback?-
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Prepin is collecting only data that user uploaded , liek CV, coverletters and job descriptions.
if you are talking about personal data, we are storing transcript and person emotions
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6
Have you tried to use DeepSeek on a background?
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No, currently we are using Groq and Olama and I'm fine with that
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Great job! just tried Prepin and it look amazing, have you build everything as a solo founder?
What's your marketing channels? -
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Nice job with the launch! Product works great!
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Thank you!
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Nice
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3
What about coding interview support?
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I'm working on it, currently I want to polish the interview part and after that will focus on new features
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Any plans to make this project B2B?
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No, currently I'm focused on B2C
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