A focused way to prepare

Build your skills.
Explain your thinking.

Choose a coding roadmap or a backend interview track. Work through one topic at a time, then apply it to practical questions.

DSA Patterns

Recognize the technique, reason about its invariant, and apply it to coding problems.

C#, memory, async, ASP.NET Core, EF Core, caching and practical backend design.

Core Java, collections, JVM, concurrency, Spring, persistence and design exercises.