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🔥 Popular Questions
The ones that come up again and again.
What is a HashMap?
What is the Stream API and how is it different from a loop?
What is a JWT and how does it work?
Solve Two Sum — return indices of two numbers adding to a target.
Which HTTP methods are idempotent and why does it matter?
What is AWS Lambda and when would you use it?
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⚡ Interview Tomorrow?
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24-Hour Revision Mode
The absolute essentials. High-frequency questions only — the ones you cannot walk in without.
Start →📅48-Hour Revision Mode
Core + the common follow-ups. Enough depth to handle a 'why' or two without panicking.
Start →🧗Weekend Deep Dive
Go beyond answers — internals, trade-offs, and system design. For when you actually have time.
Start →🧭 Beyond the Questions
Prep the whole picture — your machine, your path, your reality.
Know Your Environment
Don't guess your Java, Maven, or Docker version — verify it. Commands + config guides.
Verify setup →🔀Transition Hub
IVR, middleware, tester, .NET, mainframe? Get a roadmap from legacy to modern full stack.
Find your path →🌍Real World vs Interview
The honest gap between textbook answers and how developers actually work day to day.
Get real →📚 Explore Topics
Browse topics with live question counts.
Core Java
OOP, Collections, Strings, Exceptions, JVM internals.
Java Collections
List/Set/Map internals, HashMap, ConcurrentHashMap, performance.
Multithreading
Threads, locks, executors, the memory model, deadlocks, async.
JVM
Memory areas, garbage collection, JIT, class loading, tuning.
Java 8+
Lambdas, Streams, Optional, functional interfaces.
Advanced Java
Concurrency, JVM tuning, memory model, virtual threads.
Python
Data structures, comprehensions, decorators, the GIL.
REST APIs
HTTP verbs, status codes, idempotency, versioning.
Microservices
Service design, communication, resilience, sagas, events, observability.
JSON
Structure, parsing, serialization, schema validation.
SQL
Joins, indexes, transactions, query optimization.
AWS
EC2, S3, Lambda, IAM, VPC and the well-architected pillars.
System Design
Scaling, caching, load balancing, CAP, messaging.
Guru's Picks
16 years of banking-domain interviews, distilled into a few resources worth your time — starting with a free Java question bank.
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