PrepOps
Commonly asked interview questions with answers you can say out loud, the follow-ups that come next, and the traps that catch most candidates. Written for developers interviewing in India.
.NET backend
ASP.NET Core
From middleware and DI lifetimes to EF Core, REST, auth, caching, and microservices, plus a guide to how service, GCC, and product-company rounds run.
- Fundamentals
- C# and OOP
- EF Core and SQL
- REST APIs
- Auth
- Performance and security
- Beyond the basics
- Interview guide
- 65 fresher
- 92 mid
- 23 senior
180 questions across 8 topics
Problem solving
DSA patterns
A pattern-first problem sheet in Python: prerequisites, 25 patterns from hashing to bitmask DP, and a final mixed set with no labels.
- Prerequisites
- Linear patterns
- Recursion and trees
- Graphs
- Greedy and DP
- Specialised tools
- Mixed practice
- 48 easy
- 193 medium
- 44 hard
285 problems across 25 patterns
Frontend
React and TypeScript
JavaScript and the event loop, hooks and rendering, state, TypeScript, the browser and security, machine coding, and frontend system design, with a priority guide for SDE-1 and SDE-2.
- JavaScript
- Async and event loop
- React and hooks
- Rendering and performance
- State, forms, routing
- TypeScript
- Browser, HTML, CSS
- HTTP, auth, security
- Machine coding and design
- Priorities
- 71 fresher
- 69 mid
- 14 senior
154 questions across 10 topics
System design
Designing for scale, step by step.
How to practise
Commit to an answer before opening anything: say it aloud for interview questions, write the pattern down for problems. Then check.
Where answers come from
Sources are linked and labelled. In the DSA sheet, every template and key insight was run, most against brute-force solutions.
Source
Plain HTML, no build step. View the repository.
Also by the same author
Build routes
Hands-on learning guides: Python to FastAPI, an AI foundations crash course, then AI engineering with LLMs, RAG, evals, MCP and agents.