Practice scope, architecture, and tradeoffs with RADIO — then review your work like a staff engineer. AI coaches and probes; you own the design.
Built for interviews at product-led companies and high-growth startups — from FAANG-scale loops to lean frontend teams.
20 system design practice questions · AI coach · calibrated review · mock interviews on Premium.
Try solving a real problem with our interactive code editor. See how it feels to learn with CrackIt Dev.
Content library plus AI practice that makes you specify, trade off, and review — the work AI cannot do for you.
Real-world frontend system design case studies with architectural diagrams and step-by-step solutions.
Work through requirements, architecture, data, interface, and tradeoffs. The coach asks; you design.
45-minute timed text sessions with a senior FE interviewer persona and a performance report.
Master advanced JavaScript with problems on closures, promises, async/await, and more.
Build reusable UI components from scratch without libraries. Master machine coding rounds.
Master interview concepts with detailed explanations across React, JavaScript, TypeScript, and more. Start free and unlock the full 50+ question bank with Premium.
Data structures and algorithms problems curated specifically for frontend interviews, with increasing difficulty from Free to Premium.
Get instant AI-powered feedback on your code. Improve code quality, best practices, and catch bugs before interviews.
Test your knowledge with multiple choice questions across all frontend topics.
Why we built this
I failed a frontend system design interview because I could solve LeetCode but had never practiced designing real products out loud with feedback. CrackIt Dev is the tool I wished existed — structured practice, honest scoring, and a path from “I think I know this” to “I can defend this in a room.”
Feedback from developers using the platform
“The system design section is really well structured. I cracked multiple frontend interviews after going through the case studies and UI component challenges.”
Harshit C
Frontend Developer
@ Swiggy
“Good collection of DSA problems and JavaScript challenges. The difficulty progression makes sense and helped me move from failing JS rounds to consistently reaching final interviews.”
Akshat
Full Stack Developer, SDE 2
@ CodeAcademy
“Great platform for frontend interview prep. The UI components section aligns well with what companies actually ask, and the structure made it easy to fit prep into my week.”
Meghana
UI/UX Engineer
@ Class Plus
“Finally a prep platform built for frontend roles. Machine coding and JS rounds felt much less intimidating after working through the challenges here.”
Rahul K
Senior Frontend Engineer
@ Razorpay
Start free. Upgrade when you're ready.
Perfect for getting started
Full library + AI system design practice (mock, RADIO coach, scores).
Same as Premium — save vs paying monthly at list price.
Best value if you want ongoing prep, all future updates, and never want to worry about subscription renewals again.
ChatGPT is great for brainstorming; CrackIt Dev is for interview-shaped practice.
Free: 2 scored RADIO designs on select questions. Premium: all 20 + unlimited + mocks.
Start Learning Free