Practice interviews that actually feel real.
An AI interviewer that listens to your answers, probes deeper, and scores every session across 4 dimensions. Behavioral, coding with a live sandbox, and 6-stage system design — all voice-based, all timed, all scored.
Three interview types. One platform.
Each mode mirrors the real format — question pacing, follow-ups, timing, and scoring.
Behavioral
STAR-format practice with follow-up probes. The AI interviewer listens to your answer, then digs deeper — exactly like a real interviewer would. Scored on relevance, structure, depth, and conciseness.
- 5-6 tailored questions per session
- Up to 2 follow-up probes per answer
- STAR compliance scoring on every response
Technical & Coding
Real coding problems with a live sandbox. Write your solution, run it against test cases, and get instant feedback on correctness and complexity. The AI interviewer asks about your approach and trade-offs.
- Judge0 sandbox — Python, JS, Java, C++, Go, Rust
- Time & space complexity analysis
- Follow-up questions on approach and trade-offs
System Design
A single deep problem broken into 6 stages — just like a real 45-minute system design round. The AI guides you through requirements, API design, data modeling, high-level architecture, deep dives, and scaling.
- 6-stage state machine mirrors real interviews
- 3 probing questions per stage
- Problems sourced from FAANG-level question banks
How a mock session works
Set up in 30 seconds. Speak naturally. Get scored instantly.
Configure your session
Pick your interview type, difficulty, role, and voice. Optionally attach your resume and a job description so questions match the role you're targeting.
Speak your answers
The AI interviewer asks questions out loud. You answer by speaking naturally — real-time transcription captures everything. Silence detection knows when you're done.
Review your scorecard
Get an instant breakdown: overall score, 4-dimension subscores, key takeaways, strengths, and specific areas to improve. Track progress across sessions.
Built to make every session count
Not flashcards. Not a chatbot. A full interview simulation with voice, timing, and scoring.
4 realistic AI voices
Choose from Alex, Marcus, Sarah, or Priya. Each voice uses OpenAI TTS-1 for natural speech. Switch voices between sessions to simulate different interviewers.
Intelligent follow-ups
The AI doesn't just read a script. It listens to your answer and generates follow-up probes — depth, reasoning, alternatives, consequences, reflection, and challenge styles.
Difficulty levels
Beginner, Advanced, or Expert. Difficulty affects question complexity, follow-up depth, and scoring strictness. Start easy, level up as you improve.
Real-time transcription
Your spoken answers are transcribed in real-time via Groq Whisper. No typing — just speak naturally. Silence detection automatically ends your turn after 10 seconds.
4-dimension scoring
Every session is scored across relevance, structure, depth, and conciseness (behavioral) or problem solving, code quality, algorithms, and communication (coding).
AI answer assist
Toggle on the AI assist panel to see suggested talking points as you speak. Great for building confidence before turning it off for a realistic simulation.
Role-specific questions
Select from 40+ roles — Software Engineer, Product Manager, Data Scientist, and more. Questions are tailored to your role and seniority level.
Resume & JD context
Select your resume and target job description before starting. The AI tailors questions to your actual experience and the role you're interviewing for.
System design — the full 45 minutes
Most mock tools give you a prompt and a text box. Hoppers runs a 6-stage state machine that mirrors exactly how a real system design round works at top tech companies.
You start with requirements gathering, then move through API design, data modeling, high-level architecture, deep dives, and scaling. At each stage, the AI asks 3 probing questions to test your understanding — just like a real interviewer.
Problems are sourced from real FAANG-level question banks. "Design a URL shortener" is the warm-up — expect "Design a real-time collaborative editor" and "Design a distributed task scheduler."
After every session
A complete scorecard — not just a number.
4-dimension score
Relevance, structure, depth, and conciseness — each scored independently with color-coded indicators. Coding sessions swap in problem solving, code quality, and algorithms.
Intelligence Profile
Your scores feed into a cross-session Intelligence Profile that tracks STAR compliance, communication pace, confidence language, and filler word usage over time.
Performance insights
Interviewer sentiment timeline, speaking distribution, answer lengths, performance arc, and per-question breakdowns. See exactly where you lost points.
Your next mock is 30 seconds away
No signup required for your first mock. Or create a free account for 60 minutes of practice.