Five focused tracks. Pick one and go deep, or build an AI plan across all of them.
System design from first principles to the trade-offs interviewers probe, plus full real-world design walkthroughs.
Open High-Level Design →Object-oriented design: the patterns, the SOLID principles, and the machine-coding problems you get asked to build.
Open Low-Level Design →The recurring patterns behind coding rounds, each with the cue that triggers it, a clean template, and worked problems.
Open DSA Patterns →Operating systems, networks, databases, and concurrency, explained the way interviews actually test them.
Open CS Fundamentals →STAR stories, leadership-principle answers, and how to signal seniority without rambling.
Open Behavioral →