Java
A shop ledger page, 1899. Every line adds up.
LLD Series: Java Concurrency Essentials for LLD Rounds
In fintech LLD rounds the follow-up is almost always: now make it thread-safe (two threads debit the same wallet, two users book the same seat, two requests carry the same idempotency key). Know the...
16 min read
DSA Patterns Roadmap for Beginners: 9 Patterns With Runnable Java
Learn DSA as a small set of patterns instead of hundreds of problems. Nine patterns, each with a trigger phrase, a Java example you can run, complexity, and where it shows up in real design problems.
8 min read
LLD Series: DSA and Java Basics for LLD Interviews: A Gentle Primer for Beginners
If your DSA base feels shaky, read this first. It explains just the data structures, Big-O, concurrency and money rules that the LLD series actually uses, with runnable Java.
8 min read