This comprehensive course prepares you for DoorDash software engineer interviews and DoorDash system design interview questions.

This course prepares you for a system design interview by using a case study of DoorDash (a prepared food delivery system) and familiarizes you with the challenges you will encounter during the interview. 

You will begin by understanding the theory behind the system design interview to give you an idea of what to expect. Next, you’ll understand how to identify a system’s requirements, handle data, and lay down the architecture of the system. Along the way, diagrams and quizzes will help you solidify your concepts.

By the end of this course, you will have a solid understanding of how to approach a system design interview, and you will have the confidence to answer a number of different scenarios, no matter the question.

System Design Interview: DoorDash

## Introduce yourself to the system design interview 


**System design interviews** have gained a lot of steam over the last couple of years and are considered as an important part of onsite interviews with the majority of product development companies. These interviews tend to be very open-ended and conversational. The interviewers assess the candidate based on their technical skills involving thinking about the big picture, logical understanding of the presented problem domain, articulation, as well as on their friendliness (will I be able to work with this person?) and curiosity



In a **system design interview** which is also referred to as **SDI**, the candidate is given an example of a popular system and asked to brainstorm a design. During the process, candidates are expected to ask clarifying questions and think through every component, including the data model, keeping scalability, redundancy, fault tolerance, etc. in mind.




>The intended audience for this course is software engineers who are interested in designing systems.






## How to start? 
As the interviewer will be presenting a very vague idea of a system or functionality that you have to design, here’s how you could start:

1. **Take a deep breath and relax!** It’s super important to maintain composure to get the best out of your mind. Tension and panicking won’t help you! Although you are going to be judged, no one is going to be mean to you.
2. Don’t jump into the design **right away**.


3. Start thinking through the problem and **ask a significant number of clarifying questions**. Again, don’t spend 20 minutes asking questions that won’t work. Don’t avoid the problem and waste time with useless chatter!
4. Discuss the **scope of the problem** with your interviewer. Don’t try to design each and everything. Remember you have 45 minutes only! You've got to identify and focus only on the most important use cases.
5. Identify the **users (actors) of your application**. This is important because companies like Amazon obsess over the customer. You will earn brownie points if you are able to specify the actors..
6. Talk about **scale** and **growth** of the system.
7. Think out **loud**! Unless the interviewer is capable of penetrating mental discernment, there’s no way for them to peek into your mind.

# Introduce yourself to the system design interview 

Get introduced to what a system design interview is and learn concepts that you need to know to give the interview.

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Getting Started

Introduce yourself to the system design interview