Practice with AI feedback, run mock interviews, visualize your knowledge graph, and track real readiness — all in one focused platform built for developers.
No credit card required · Free to start
Everything in one place
Browse a curated library of technical interview questions filtered by topic, difficulty, and tags. Whether you're targeting DSA, system design, or behavioral rounds — find exactly what you need in seconds.
Not just model answers — layered explanations you can dial up from ELI5 to senior engineer depth. Every answer includes code examples, edge cases, and a quick knowledge check.
A hash table stores key-value pairs. A hash function converts keys into array indices for O(1) average lookup time.
Stop passive reading. Type your own answer, submit it, and get line-by-line AI feedback on what you got right, what you missed, and how to improve. Follow up with timed quizzes to cement retention.
Question
Explain the difference between `==` and `===` in JavaScript.
Your Answer
== checks value equality with type coercion, while === checks both value and type strictly without coercion...
✅ Correct on type coercion. ✅ Strict equality covered. ⚠️ Missing: mention NaN === NaN returning false.
Flip through smart flashcards designed for spaced repetition. Mark cards as known or needs-review and let the system resurface the ones you need most — right before they slip from memory.
Simulate live interviews with an AI interviewer who asks follow-ups, challenges your answers, and scores your performance. Build confidence before the real conversation.
A live dashboard shows your readiness score, mastery by topic, streak history, and your weakest areas — so every study session is targeted, not random.
Skip the overwhelm. Your roadmap adapts to your role, timeline, and performance — surfacing the next best thing to study so you make the most of every hour.
A visual map of every topic and its relationships — colored by your mastery level. Spot the gaps you didn't know you had and follow the links to fill them.
Most developers read solutions without truly understanding them. InterviewPrep forces you to write, explain, and prove your understanding.
Testimonials
Real feedback from real engineers
"The mock interview feature is genuinely scary-good. The AI asked me a follow-up I wasn't expecting and I realized I had a gap I didn't know about. Got the offer two weeks later."
"I've tried every prep platform out there. What's different here is writing my own answers and getting real feedback — not just reading model solutions and fooling myself I understand."
"The knowledge graph alone is worth it. I could visually see that I was strong on trees but had completely ignored graph traversal. Fixed that in a week and aced the coding round."
"I prepared for 3 weeks using the roadmap feature and it kept me honest. No random YouTube rabbit holes — just focused, targeted prep that got me to senior-level confidence fast."
"The ELI5 to senior-level depth ladder for answers is brilliant. I start simple, understand the core, then ramp up. Never felt this prepared going into a technical screen before."
"The streak system kept me going even on days I didn't feel like studying. That consistency is what actually makes a difference. Shipped 30 days straight and landed three offers."
Build interview confidence systematically. Start with one question today — your roadmap, your flashcards, and your AI coach are waiting.
Free forever · No credit card · Start in 30 seconds