100+ High-Quality Logic Challenges
Brainfuck is designed to be the ultimate resource for interview preparation. We provide free access to complex puzzles that are frequently asked in Quant, HFT, and SDE interviews at top firms.
We credit the legendary Brainstellar.com as our primary source of inspiration. We have updated and curated this collection to help modern developers and quantitative analysts succeed in their job search.
Every puzzle and solution is completely free. We believe quality educational resources should be accessible to everyone preparing for their career.
Your preparation is private. We use local storage to track your progress, meaning your data never leaves your device. No login required.
All solutions are meticulously checked for accuracy and clarity, ensuring you learn the underlying logical principles needed for HFT and SDE roles.
Join the discussion on any puzzle to see alternative solutions, share insights, and connect with others preparing for similar roles.