Interview preparation notes that actually make you understand — not just memorize.

Most tech interview prep relies on staring at massive, unformatted PDFs for hours. PrepSphere changes that by transforming 150+ core concepts into a fast, highly-structured knowledge base.

Covering 14 core domains—from DBMS and System Design to Language Cores and Puzzles—every topic is written like a senior engineer explaining it to a junior. We stripped away the fluff and focused purely on what interviewers actually test: visual architecture, trade-offs, and competitive edge points that 95% of candidates miss.

Designed specifically for engineers targeting Google, Amazon, Microsoft, and top-tier product companies.