Real interview sources
Collected from interview experiences that candidates share publicly and from community contributions, not textbook drills. New questions show their source links right on the card.
An IT interview prep library,
curated and structured.
Questions from real interviews and community contributions, edited into detailed answers and organized by topic and level. Alongside them: quizzes, algorithm practice and flashcards. Mostly free.
4,452
questions with answers
4,233
quiz questions
56
topics
53
algorithm problems
Highlights
In-depth answers
Answers go deep: code examples, trade-off analysis and the context where each applies, enough to answer with confidence. Each answer is available in English and Vietnamese.
Quizzes with explanations
Topic-based quiz sets to build recall speed. Answer, and the correct option appears right away with an explanation. Leaderboards and streaks included.
Algorithm practice by topic
Algorithm practice is organized by topic (two pointers, sliding window, graphs…), with step-by-step solutions and visualizers for the topics that are hardest to picture.
Spaced-repetition review
Flashcards bring back the cards you are about to forget, right when you need them. Short sessions, lasting recall.
Frequently asked questions
Beginner and Intermediate questions and quizzes are free, with no sign-up required. The Pro plan unlocks the Advanced tier, and the full algorithm practice section — see the Pricing page. Pro revenue funds infrastructure and editorial work.
From real IT interview rounds, contributions from the Vietnamese developer community, and the foundational knowledge required for each role. Every question is edited for clarity and completeness; new ones include source links so you can verify them yourself.
The question bank is for deep reading; quizzes train recall under time pressure. Sets are drawn per topic and level, each answer reveals the correct option with an explanation, and results are saved for progress tracking and the leaderboard.
Classic problems grouped by solving pattern (two pointers, sliding window, binary search, graphs…), each with an approach breakdown, reference code, and complexity analysis. Some topics add step-by-step visualisers. This section is currently Vietnamese-only.
Cú is the site’s AI tutor, the owl in the bottom-right corner. It re-explains a Q&A item in plainer terms, suggests what to review next and points you to the right page. It requires sign-in and has a daily message limit.
Flashcard review schedules stay in your browser. When signed in, bookmarks, learned questions, quiz results, posts, and CVs you upload for analysis are stored server-side for cross-device sync; CVs can be deleted at any time. Data is never sold to third parties — see the Privacy Policy for details.
Regularly: new questions from recent interviews, refined answers, and new topics (DevOps, Kubernetes, AI Engineering…). Each release is documented on the Changelog page and announced via a "What's new" notification — enable push in Account settings to get it right in your browser.
Email nguyendangdinh47@gmail.com, with replies within 24–48 business hours. Question suggestions and bug reports have their own form in the footer, screenshots included.
Start your prep
Open the question library and start — no sign-up required.