The 2-Week System Design Interview Prep Guide (2026)

Blog / The 2-Week System Design Interview Prep Guide (2026)
2-Week System Design Interview Prep
System design interviews are tough.Not only does the interviewer know the system better than you.They are also essentially unbounded problems because the interviewer can go deeper at any part of the design.However, there is good news.Every system design usually follows the same process. And once you know this process it makes interviews a breeze.So if you have an interview coming up in the next two weeks, you are in the right place.No fluff. Just the exact set of questions you need to study to pass the interview.

Interview Structure

System design interviews follow a very standard pattern. Typically 45 minutes broken down as follows:
Time AllocationFocus Area
5 minutesClarifying questions
5 minutesNon functional requirements & estimates
15 minutesHigh level design
20 minutesDeep dives

Study Structure

We’re assuming you have a full time job and don’t want to spend every waking hour in front of a computer.However, since you only have 2 weeks and if you want to compete against candidates that have been studying for months, you will need to grind it out.You should aim to set aside 2.5 hours to study per day or change it to what works best for your schedule.The only requirement is that you have 35 hours (2.5 hours x 14 days) to study. And if you have more time we’ll show you where best to spend that as well.The study structure is broken into two parts:
  • Core Concepts
  • Interview Specific System Design

Part 1: Core Concepts

These are the fundamental concepts in system design that all software engineers should know. The hard part isn’t learning them, it’s finding out what they are.There’s nothing worse than when an interviewer asks you about a concept you’ve never even heard of.Luckily for you, we have done the heavy lifting and compiled a list of 43 questions that cover all the core concepts of system design:
  • Scalability & performance
  • Distributed System Theory
  • Database Choice
  • Caching
  • Messaging
  • Architectural patterns
You should aim to know all of them after 4 days (10 hours) of study.Once you know them well you will be in the perfect position to start step 2 of the process.

Part 2: Interview Specific System Design

Now that you know the core concepts, here comes the fun part.It’s time to study the actual system design questions companies like to ask.If you know what companies you are applying to you should check what system design questions they ask in our companies section.But if you don’t know and want to maximize your chances of acing the interview, don’t worry we have you covered.This list of system designs contains the most commonly asked system design questions ordered by most frequently asked. So studying these questions in order is the most efficient way of spending your study time.So now that you know which questions to study, all that’s left is to know how to study them.Each system design contains:
  • Video solution
  • Editorial write up
  • AI Whiteboard
System Design: Video, Write Up, AI Whiteboard
When all three modes are used together they are an extremely powerful tool.We recommend you first watch the video solution to get an idea of the overall system design. You should spend roughly 30 minutes watching this video solution.Then spend at least 1 hour reading the write up to ensure you understand all the concepts.
System Design: AI Whiteboard
Finally, once you are confident you should test yourself against the AI whiteboard where you will be able to go through the interview exactly like how an interviewer expects and draw out your solution and get focused AI feedback.Keep practicing using the AI whiteboard until you know it well. This will be the single biggest differentiator between you and other candidates and will help you stand out as a top applicant.That means by the end of the 14 days you will have studied the fundamental core concepts and 10 system designs. If you have more time you should continue studying more of the system design questions as the more you study the greater the chance you will be asked a question you already know.Here is the full day by day breakdown:
DayPartContent
1Part 1: Core ConceptsScalability & performance, Distributed System Theory
2Part 1: Core ConceptsDatabase Choice, Caching
3Part 1: Core ConceptsMessaging, Architectural patterns
4Part 1: Core ConceptsReview all Core Concept questions
5Part 2: System DesignDesign 1: Tiny URL
6Part 2: System DesignDesign 2: News Feed
7Part 2: System DesignDesign 3: Messaging App
8Part 2: System DesignDesign 4: Rate Limiter
9Part 2: System DesignDesign 5: Autocomplete System
10Part 2: System DesignDesign 6: Web Crawler
11Part 2: System DesignDesign 7: Video Streaming Platform
12Part 2: System DesignDesign 8: Top-K Leaderboard
13Part 2: System DesignDesign 9: Notification System
14Part 2: System DesignDesign 10: Social Media Platform
If you execute on this, you will pass.Best of luck!