Don't just prepare for interviews — train for the job you actually want.
Real questions from real companies — paired with tiered hints, structured guides and progress tracking that shows you exactly how close you are to offer-ready. One focused place to go from "where do I even start?" to "I got the offer."
practice session
Group Anagrams
MediumArraysHash Map
✓ Solved
💡 Hint 1 — What property do all anagrams of a word share once you sort their letters?
🔒 Hint 2 & full approach — sign in for free to unlock the rest of the breakdown
Asked at Amazon · Google · MetaYour progress: On track 🔥
1000+
Curated questions
50+
Companies mapped
5
Skill tracks
24/7
Progress tracking
🌱 Our Vision
Great engineers get passed over every day — not for lack of skill, but because they walked into the room
not knowing how the questions would be asked. We started PrepForge to close that gap. Our mission
is to train every candidate — from first-time job seekers to seasoned engineers chasing their next big
leap — with the same depth, structure and company-specific insight that top performers use to land offers
at the companies they actually want to work for.
No more scattered PDFs, stale question lists or guesswork. Just one clear path from
"where do I even start?" to
"I got the offer" — one focused session at a time.
How PrepForge gets you there
🗺️
Pick your track
Choose from DSA, SQL, System Design, QA or Cloud certifications — or follow the question bank mapped to your target company.
⚡
Practice with purpose
Work through real interview questions with tiered hints, approaches and theory — built to teach you how to think, not just what to type.
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Track & improve
Bookmark the tricky ones, log your progress, and keep circling back until your weak spots become your strengths.
🎯
Walk in ready
Show up knowing exactly what to expect — and confident that you've already solved problems just like it.
What you'll find here
🧩
Data Structures & Algorithms→
Hand-picked coding problems with tiered hints, approaches & theory — built to teach you how to think, not just what to type.
🗄️
SQL→
Database & query questions pulled straight from real interview rounds — from fundamentals to query optimisation.
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System Design→
HLD & LLD topics broken into structured, digestible sections — from core fundamentals to scaling real systems.
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QA & Testing→
Quality assurance & testing questions for every level — manual, automation and everything in between.
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Companies→
See exactly which questions top companies ask — and how often — so you can focus your prep where it counts most.
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Certifications→
Practice exams for Cloud, DevOps, Project Management & more — track your prep right alongside your interview goals.
Your dream job is one prep session away.
Create a free account to bookmark questions, track your progress and pick up right where you left off.