The quiet copilot for technical interviews.
Real-time audio transcription, intelligent algorithmic hints, and system architecture blueprints. Delivered in an invisible, zero-latency desktop interface.
“Given an array of integers nums and an integer target, return indices of two numbers that add up to target. Can you do it in O(N)?”
How Prepzen Works
Designed from the ground up for maximum discretion, zero friction, and high-stakes performance.
Context Ingestion
Upload your target Job Description and Master Resume. Prepzen indexes your past projects and skills so every recommendation sounds like you.
Silent Preflight
Launch the native desktop companion before your call. Automated preflight verifies audio loopback and confirms OS-level window exclusion.
Real-Time Assistance
As your interviewer talks, Prepzen streams live transcription and displays structured hints, code, and STAR talking points in your peripheral view.
Discreet power for every interview loop.
Built from scratch for software engineers, tech leads, and distributed systems architects.
Hardware-Level Screen Share Invisibility
Prepzen communicates directly with native OS window display managers. Utilizing WDA_EXCLUDEFROMCAPTURE, video software captures only your browser or IDE — leaving Prepzen completely undetectable.
Lossless Loopback Audio
Direct audio loopback captures interviewer speech from headphones with zero acoustic feedback or echo, transcribing both voices seamlessly.
Algorithmic Code Synthesis
Instant conceptual clues, edge case checklists, and full implementations in Python, Go, Java, TypeScript, and C++.
Distributed Architecture Math
Back-of-the-envelope calculations, QPS sizing, partitioning strategies, and database trade-offs formatted for verbal delivery.
Grounded STAR Storytelling
Every behavioral response pulls from your uploaded Master Resume. Your real numbers, actual team leadership moments, and genuine achievements.
Never sound like an AI robot.
Generic chatbots fail technical interviews because interviewers test for real-world scars. Prepzen bridges the gap by synthesizing your actual resume achievements into every answer.
“How would you design a distributed cache invalidation system?”
“A distributed cache invalidation system uses Redis Pub/Sub. When data updates in DB, publish an invalidation channel message and subscribers purge keys. Consider using TTL for eventual consistency.”
“At my previous role at Stripe, I decoupled write-path invalidation using a Debezium CDC pipeline reading PostgreSQL WAL logs into Kafka. We used 200ms lease tokens to eliminate thundering herd under 80k QPS.”
The loop doesn’t end when the call disconnects.
Prepzen automatically structures your session into an actionable debrief. Review every question asked, check your technical coverage, and prepare thank-you follow-ups within minutes.
Full Timestamped Transcript
Searchable question-by-question dialogue breakdown with speaker timeline.
Coverage & Weak-Spot Diagnostics
Identify which system trade-offs were discussed and what to sharpen for round 2.
Tailored Follow-Up Notes
Generate personalized thank-you notes referencing specific technical discussions.
Discretion by design.
We engineered Prepzen with the strict assumption that an accidental leak or detection is catastrophic. Every layer is built with defense-in-depth paranoia.
Native Display Exclusion
Prepzen registers with the OS graphics compositor (WDA_EXCLUDEFROMCAPTURE). Screen recording APIs on Zoom and Teams capture straight through the window.
RAM-Only Ephemeral Audio
Interview speech is transcribed in volatile memory. No audio files or raw voice recordings are ever written to your disk or stored on external cloud servers.
Zero Model Training
Your resume, interview transcripts, and code solutions are never used to train public or private models. Your career privacy remains strictly your own.
Instant Panic Protocol
Double-tap Esc (Escape ×2) at any moment to vaporize the window from your screen and system process tree in less than 10 milliseconds.
One offer pays for a lifetime of Prepzen.
Start for free. Scale up your credits when your interview loop begins.
Free Starter
20 AI Credits includedPerfect for testing your audio loopback and running your first mock interview loop.
Pro Interviewee
500 AI Credits / monthFor active candidates who need full stealth HUD mode, Claude 3.5 Sonnet, and instant code solutions.
Career Pass
2,000 Minutes / month (33.3 Hours)2,000 minutes (33.3 hours) for senior, staff, and leadership candidates tackling grueling loops.
Confidence backed by offers.
See how software engineers use Prepzen to tame interview anxiety and land top compensation packages.
“The system design suggestions were insane. In my Meta loop, the interviewer asked about distributed consensus and log compaction. Having the key trade-offs right in my peripheral vision kept me totally calm.”
Alex K.
Staff Software Engineer • Ex-Amazon → Meta L6
“I was always terrified of live coding whiteboard pressure. Prepzen's stealth HUD showed me the O(N) sliding window trick within 5 seconds of the prompt. Landed a $240k offer.”
Priya S.
Senior Backend Developer • Fintech Scale-up
“Unlike other clunky browser extensions that interviewers can detect on screen share, Prepzen's native desktop overlay was 100% invisible on Zoom. Completely game-changing.”
Marcus T.
Fullstack Tech Lead • AI Infrastructure Startup
Frequently Asked Questions
Everything you need to know about screen-share invisibility, audio capture, and privacy.
Step into your next loop with quiet confidence.
Download the native desktop client now. 20 free credits included. No credit card required.