Java Backend Interview Preparation: Zero to Hero
A complete interview-prep lab: 138 DSA problems with an in-browser code runner, 43 LLD designs, HLD, and Java backend deep-dives.
About this course
Everything needed to prepare for a Java Software/Senior Software Engineer interview, in one interactive guide:
Part 0 — Foundations: a conceptual Q&A bank, a DP mental model, a DSA pattern map, load balancer/proxy/API gateway concepts, a database scaling cheatsheet, deployment strategy, and API/JWT/idempotency fundamentals.
138 DSA problems, each with a runnable code lab (edit and run against real test cases directly in the browser), a step-by-step walkthrough, and multiple test cases per problem — arrays, strings, trees, graphs, dynamic programming, and more.
43 Low-Level Design (LLD) problems — object-oriented system designs like a car rental system, worked through in depth.
High-Level Design (HLD) expansion and backend high-yield topics, including HashMap internals in modern Java.
This is a genuinely large body of work — a real interview-prep course, not a teaser.
Try the first lesson free
Read the opening of the course in full, no account needed.
Course index
- Foundations & Conceptual Bank
- Backend high-yield
Ends with a final quiz. Score 70% or better and you can download a completion certificate in your own name — shareable on LinkedIn and verifiable by its certificate code.