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System Design and AI Engineering, by Roni Das. 984 interactive lessons.
Start Learning106 classic system design problems, each solved in full: requirements, scale estimates, architecture, data model, deep dives, trade-offs, and the lessons to study before you walk in.
every card shows the problem’s own first number
Want the questions first, each with a short answer?
Read them on one page, grouped by type, then come back here for the full walkthrough of any of them.
System design interview questionsPlan your prep: system design roadmap 2026 · forward deployed engineer guide · RAG interview questions · SDE-2 system design · software engineer to AI engineer · agentic AI engineer · inference engineer
Not sure where you stand? Take the free interview readiness score (5 minutes, no sign-up).
Two courses by the author of this page:
770 lessons · 18 free to read
₹1,111 in India · $25 elsewhere, once
Get System DesignYou own this course
214 lessons · 10 free to read
₹1,333 in India · $35 elsewhere, once
Get Generative AI and Agentic AIYou own this course
Interview prep packs
Real interview questions, each with why it is asked, a full answer, the follow-ups, the common mistakes and a diagram. Read five from each pack free.
Is your round a machine coding round? Low level design is a different interview: classes, design patterns and working code for a parking lot, a vending machine or tic-tac-toe.
Low level design questionsPreparing for system design rounds at Flipkart, Swiggy, Zomato, Zepto, Blinkit, PhonePe, Paytm, Razorpay, CRED, Zerodha, Dream11, Nykaa, Rapido, MakeMyTrip, BookMyShow or IRCTC? These walkthroughs cover the exact products they build, with the real scale numbers, architecture, and trade-offs Indian interviewers actually probe.
28 walkthroughs of the products Indian interviewers ask about, each with the real scale numbers, the architecture and the trade-offs that company had to make.
The canonical questions asked at Google, Meta, Amazon, Uber, Netflix, and the AI labs, from URL shorteners and news feeds to RAG systems and vector databases.
practise before the real round
Every walkthrough here leans on lessons from the System Design course: interactive diagrams, runnable code, quizzes, and 20 capstone projects. 18 lessons are free to read first.
Read the free lessonscourse 1
From absolute beginner to principal engineer, drawn step by step.
