Low Level Design (LLD) Course — OOD, Patterns & Machine Coding

LLD is the code-level design of a single component: the classes and interfaces, how responsibilities are split, which patterns apply, and how the design absorbs a new requirement without a rewrite. It is what the machine-coding and object-oriented-design rounds test.

Java by default, since most Indian and enterprise interviews expect it, but the design principles are language-agnostic and the 1-on-1 track can run the same problems in Python or C# if that is what your interviews use.

The standard interview set, worked live end to end: parking lot, BookMyShow ticket booking, elevator, ATM, chess, library management, splitwise, vending machine, logging framework and rate limiter — each with class design, code and a review of the trade-offs.

Not strictly — LLD is about design rather than algorithms — but strong fundamentals help you write the code quickly under time pressure. Data Structures & Algorithms is part of this track for exactly that reason, and many learners run the two in parallel.

On working code first, then class design and extensibility, then whether you can justify your choices. The live sessions rehearse all three: you code against the clock, then walk an interviewer through your design and defend the trade-offs.