Cracking the tech interview at DoorDash can be challenging. However, you can outperform the competition by thoroughly preparing for frequently asked DoorDash interview questions. One of the leading online food ordering and delivery platforms, DoorDash is constantly looking for software engineers.
Software engineers at DoorDash work on everything from backend systems, creating well-designed and thoughtful user interfaces to scaling products to automate human processes and make deliveries quick.
DoorDash technical interview questions form a crucial component of the interview loop for software engineers. DoorDash designs interview questions to effectively gauge your ability to perform in the specific role. You should be able to showcase expertise in data structures and algorithms to ace the DoorDash technical interview. Your ability to effectively communicate and solve problems is vital.
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The DoorDash technical interview will be challenging. The interviewer will look for qualities that will work as an asset to the technical team and fulfill the company's business goals. So in this article, we’ll share a list of DoorDash interview questions that will help you boost your tech interview prep.
Here's what we'll cover:
Hiring managers at DoorDash tend to ask fewer behavioral and soft skills interview questions compared to other tech companies.
So you must have a firm grip over data structures and algorithms to ace DoorDash technical and coding interview questions.
At DoorDash, you will get a take-home project as a part of the coding interview rounds. Here, the interviewer will ask you to add or change a feature within an already built application.
However, iOS coding interviews do not have any take-home projects. Instead, you will have to participate in a technical phone screen round and work with an iOS engineer in completing a partially finalized application.
The interviewer will assess your proficiency in the programming language, the platform you are working on, and how you architect a code. DoorDash asks mostly LeetCode questions in coding rounds focusing on strings, arrays, and edge cases.
Some common DoorDash Interview questions requiring coding are:
Practice more coding interview questions and check their solutions on the Problems page to ace coding interviews.
If you are a software engineer, software developer, or engineering manager, you should be well-prepared for DoorDash interview questions on algorithms. For algorithms, you must be adept in the following:
Here are some DoorDash interview questions and answers on algorithms for your practice:
Binary search is the fastest searching algorithm and is widely used for efficient searching. It has a time complexity of O (log n).
Greedy algorithms work step-by-step. They always choose the steps that result in immediate profit/benefit. They choose the locally optimal solution. Greedy algorithms may not always provide the optimal global solution, as they don't consider the entire data. Examples are Knapsack, Dijkstra’s problem, Prim's, and Kruskal's.
The most widely used cryptographic algorithms are:
Insertion sort is an in-place sorting method. It does not require any minimal or additional data storage. Only a single list element should be stored outside the starting data, resulting in a constant space complexity [O (1)].
Here are some more DoorDash algorithm interview questions:
When it comes to answering DoorDash interview questions related to data structures, you should be well-versed with the best, worst, and average runtime complexities for removing, finding, and inserting elements. Topics you must cover include:
While other data structures can also be a part of the DoorDash interview questions, you can expect these commonly asked sample questions:
Recommended Reading: Top 20 Interview Puzzles for Software Engineers
The DoorDash interview questions on system design are for senior software engineer positions. The questions evaluate your ability to build a scalable system with optimal design. You can research and reverse engineer some common systems within your domain to practice for system design questions.
For instance, frontend developers can practice using applications such as Gmail or DoorDash. Backend developers can focus on large systems messenger services. Some sample DoorDash interview questions on system design are:
Read System Design Interview Preparation Tips to learn about the best approach you can take to solve design problems.
Here are some important tips to follow to answer DoorDash interview questions with confidence and ace the interview:
DoorDash case study interview questions explore your problem-solving abilities and how you can offer actionable insights to the business using your data analytics and data science knowledge.
The interviewer provides you with a dataset and related questions. Datasets usually include details such as drivers, delivery times, money made, and tips. You will have to think of a business problem that DoorDash probably faces that you can tackle with ML.
Next, you have to build a model. Based on the model, you will have to offer solid recommendations to the business. You might have to implement EDA.
Practice these DoorDash case interview questions to prepare yourself:
DoorDash interview questions also include behavioral and hypothetical situations. Here are some questions for your practice:
This completes the list of DoorDash interview questions. Here are some frequently asked questions on DoorDash interview prep and the process that you should know for your knowledge.
Q1. How do I prepare for DoorDash interview questions?
You should start by scanning DoorDash’s job openings page and understanding the role requirements to prepare well for DoorDash technical interview questions. You can practice coding on a whiteboard or remotely use a shared screen. Working out several sample problems will make the actual interview situation more familiar.
Q2. Are DoorDash interview questions for technical rounds hard?
Interviewees suggest that DoorDash interview questions are of easy-medium level. You should be well-versed in coding, data analysis, and algorithms to ace the DoorDash interview questions.
Q3. How long does it take to hear back after the DoorDash interview?
On average, DoorDash sends the response within a week after the interview process. However, the complete hiring process takes around 2-3 weeks.
Q4. How long does the DoorDash background check take?
According to DoorDash, your background check can take between 5-7 business days. Sometimes, it can take up to 5-10 days for approval.
Whether you're a coding engineer preparing for a software developer or software engineer role, a tech lead, or you're targeting management positions at top companies, IK offers courses specifically designed for your needs to help you with your technical interview preparation!
As pioneers in the field of technical interview preparation, we have trained thousands of software engineers to crack the most challenging coding interviews and land jobs at their dream companies, such as Google, Facebook, Apple, Netflix, Amazon, and more.