Crack your next Big Tech interview
Practice company-specific problems, master system design, and get 1:1 coaching from engineers at Google, Meta, and top startups — all in one platform.
Everything you need to land the offer
From first problem to final offer — one platform covers the full interview journey.
Company-Specific Problems
3,000+ algorithm and coding problems curated by company. Filter by Google, Meta, Amazon, Kakao, and 466 more.
System Design Practice
44 in-depth system design problems with AI step-by-step feedback. Design at the Mid, Senior, and Staff level.
Live Mock Interviews
1:1 real-time interviews with professional coaches. Shared code editor, live whiteboard, and AI-graded feedback.
1:1 Coaching Sessions
Coffee chats, resume reviews, and mock interviews with engineers from FAANG and top global startups.
Global Job Board
1,200+ open roles at top companies across US, Singapore, Japan, and Korea, updated weekly.
AI-Graded Feedback
Every mock interview is scored by GPT-4. Get a grade (Junior / Mid / Senior) plus strengths and improvements.
How it works
Three steps from zero to offer.
Pick your target company
Browse 470+ companies and filter problems by the exact patterns each company tests in their interviews.
Practice and get AI feedback
Solve problems, study system design, and run live mock interviews — get graded feedback after every session.
Book a coach when you are ready
Schedule a 1:1 session with a real engineer before your real interview for a final confidence boost.
Simple, transparent pricing
Start free. Upgrade when you need AI feedback and mock interviews.
Free
No credit card required
- 3,000+ coding problems
- 470+ company profiles
- 1,200+ job postings
- Algorithm problems by company
Cairn Premium · Annual
$14.92 / month · 62% off monthly
- AI code analysis on every algorithm submission — know exactly why you failed and how to fix it
- Code Craft (20 problems) — real company scenarios with AI step-by-step coaching
- System Design (44 problems) — diagram feedback and AI-guided architecture critique
- Mock Interview with full AI evaluation, scorecard & grade breakdown
- Resume AI analysis — targeted suggestions to pass ATS and recruiter screens
- All difficulty levels unlocked (Mid / Senior / Staff)
- Unlimited sessions — practice until you're ready
Secure payments via Stripe. Cancel anytime.
Coaching
Book individual sessions, no subscription
- 1:1 Coffee Chat
- 1:1 Mock Interview with video
- Resume Review & feedback
- Real-time shared code editor & whiteboard
All payments are processed securely by Stripe. Cancel Premium anytime.
Practice for these companies
Problems curated from real interviews at 470+ companies.
Your next offer is one practice away
Engineers across 10+ countries use Cairn to prepare for their dream role. Start free today.