# Software Engineer
**Role:** Software Engineer · **Level:** Software Engineer I
**Company:** [The Trade Desk](https://scaleengineer.com/companies/the-trade-desk)
**Difficulty:** Medium
**Salary:** US$85000 - US$110000
**Experience:** 0 - 2
**Timeline:** ~7 days
The interview process for a Software Engineer I at The Trade Desk is designed to assess a candidate's foundational technical skills, problem-solving abilities, and cultural fit within the company. It typically involves multiple rounds, starting with an HR screening, followed by technical interviews focusing on data structures, algorithms, and coding proficiency, and concluding with a behavioral and system design interview to evaluate broader engineering thinking and collaboration skills.
Canonical: https://scaleengineer.com/interviews/the-trade-desk/software-engineer-i-software-engineer
---
## Overall evaluation

- Technical Aptitude
- Communication and Collaboration
- Cultural Fit and Behavioral Traits

## Questions asked

- Write a function to reverse a linked list.
- Given an array of integers, find the contiguous subarray with the largest sum.
- Explain the difference between a process and a thread.
- How would you design a system to handle real-time bidding in advertising?
- Tell me about a time you disagreed with a team member and how you resolved it.
- What are your strengths and weaknesses?
- Describe a situation where you had to learn a new technology quickly.

## Preparation tips

### lists

- Review fundamental data structures (arrays, linked lists, trees, graphs, hash maps) and algorithms (sorting, searching, dynamic programming, recursion).
- Practice coding problems on platforms like LeetCode, HackerRank, or Coderbyte, focusing on medium-difficulty problems.
- Understand basic system design principles, such as scalability, reliability, and trade-offs.
- Prepare to discuss your past projects in detail, focusing on your contributions, challenges, and learnings.
- Research The Trade Desk's products, values, and recent news to demonstrate genuine interest.
- Prepare STAR method (Situation, Task, Action, Result) answers for common behavioral questions.
- Brush up on your chosen programming language's syntax and common libraries.
- Practice explaining your thought process clearly and concisely, even when you're stuck.

### studyPlan

- {"title":"Data Structures and Algorithms Fundamentals","longDescription":"Weeks 1-2: Focus on core data structures (Arrays, Linked Lists, Stacks, Queues, Trees, Graphs, Hash Maps) and their common operations. Practice implementing them and solving problems related to their usage. Cover basic algorithms like sorting (Merge Sort, Quick Sort) and searching (Binary Search).","shortDescription":"Weeks 1-2: Data Structures & Basic Algorithms. Practice implementation and problem-solving."}
- {"title":"Advanced Algorithms and Complexity Analysis","longDescription":"Weeks 3-4: Dive deeper into algorithms, including dynamic programming, recursion, greedy algorithms, and graph traversal (BFS, DFS). Work on medium-difficulty problems on platforms like LeetCode, focusing on time and space complexity analysis.","shortDescription":"Weeks 3-4: Advanced Algorithms. Focus on DP, recursion, greedy, graph traversal. Analyze complexity."}
- {"title":"Introduction to System Design","longDescription":"Week 5: Begin exploring system design concepts. Understand principles of scalability, load balancing, caching, databases (SQL vs. NoSQL), and API design. Practice designing simple systems like a URL shortener or a Twitter feed.","shortDescription":"Week 5: System Design Basics. Scalability, caching, databases, APIs. Design simple systems."}
- {"title":"Behavioral Preparation and Company Research","longDescription":"Week 6: Focus on behavioral preparation. Prepare STAR method answers for common questions related to teamwork, problem-solving, leadership, and handling failure. Research The Trade Desk's values and culture.","shortDescription":"Week 6: Behavioral Preparation. STAR method, company values, teamwork, problem-solving."}
- {"title":"Mock Interviews and Final Review","longDescription":"Week 7: Mock interviews and final review. Practice coding problems under timed conditions. Refine explanations of past projects and system design concepts. Review any weak areas identified during practice.","shortDescription":"Week 7: Mock Interviews & Final Review. Timed coding, project explanations, system design refinement."}

## Location differences

- {"location":"Remote","differences":{"tips":["Highlight experience with cross-functional teams.","Be prepared to discuss time zone management if applicable."],"interviewFocus":["Adaptability to different project needs.","Collaboration within a global team structure."],"commonQuestions":["Tell me about a challenging project you worked on.","How do you approach debugging a complex issue?","Describe a time you had to work with a difficult teammate."]}}
- {"location":"On-site (e.g., Los Angeles, New York, London)","differences":{"tips":["Research the specific office's projects and focus areas.","Be ready to discuss how you can contribute to the local team's success."],"interviewFocus":["Understanding of the local market and its challenges.","Contribution to the local engineering culture."],"commonQuestions":["What are your thoughts on the local tech community?","How do you stay updated with industry trends in this region?","Describe your experience with local regulatory compliance if applicable."]}}

## Round 1: Recruiter Screen
**Type:** HR Screening · **Difficulty:** Easy · **Duration:** 30 min
Initial call with HR to discuss background, motivation, and logistics.
This initial screening call with an HR representative or recruiter is designed to assess your overall fit for the role and The Trade Desk. They will discuss your resume, career aspirations, salary expectations, and availability. It's also an opportunity for you to learn more about the company culture and the specifics of the role.
**Interviewers look for:** Clear communication; Basic understanding of the candidate's background; Cultural alignment
**Evaluation criteria:** Basic communication skills; Understanding of resume; Enthusiasm for the role and company
**Common rejection reasons:** Inability to communicate thought process effectively.; Lack of fundamental coding skills.; Poor understanding of basic data structures and algorithms.
## Questions

- Tell me about yourself and your background.
- Why are you interested in The Trade Desk?
- What are your salary expectations?
- What are your strengths and weaknesses?

## Preparation tips

- Be prepared to talk about your resume and why you are interested in this specific role.
- Research The Trade Desk's mission, values, and recent news.
- Have your salary expectations ready.
- Prepare questions to ask the recruiter about the role, team, and company culture.

## Round 2: Technical Coding Interview
**Type:** Technical Interview (Coding) · **Difficulty:** Medium · **Duration:** 60 min
Solve 1-2 coding problems focusing on data structures and algorithms.
This round focuses on your core programming skills. You will be asked to solve one or two coding problems, typically involving data structures and algorithms. The interviewer will assess your ability to write clean, efficient, and correct code, as well as your approach to problem-solving and your understanding of time and space complexity.
**Interviewers look for:** Ability to break down problems; Correct and efficient code implementation; Understanding of time and space complexity; Clear communication of thought process
**Evaluation criteria:** Problem-solving ability; Coding proficiency; Data structure knowledge; Algorithmic thinking; Code clarity and efficiency
**Common rejection reasons:** Inability to solve coding problems efficiently.; Poor time and space complexity analysis.; Difficulty translating problem statements into code.; Lack of understanding of fundamental data structures.
## Questions

- Given an array of integers, return indices of the two numbers such that they add up to a specific target.
- Implement a function to check if a binary tree is a valid Binary Search Tree.
- Find the kth smallest element in a sorted matrix.

## Preparation tips

- Practice coding problems on platforms like LeetCode, HackerRank, or Coderbyte.
- Focus on common data structures (arrays, linked lists, trees, hash maps) and algorithms (sorting, searching, dynamic programming).
- Practice explaining your thought process out loud as you code.
- Be prepared to discuss the time and space complexity of your solutions.

## Round 3: System Design Interview
**Type:** Technical Interview (System Design) · **Difficulty:** Medium · **Duration:** 60 min
Design a scalable system, discussing trade-offs and components.
This round assesses your ability to design and think about larger-scale systems. You'll be given an open-ended problem (e.g., design a URL shortener, a social media feed, or a rate limiter) and expected to discuss various aspects of the design, including data models, APIs, scalability, and potential bottlenecks. The focus is on your thought process and ability to make reasoned design choices.
**Interviewers look for:** Ability to design distributed systems; Understanding of databases, caching, and load balancing; Consideration of reliability and availability; Clear articulation of design decisions and trade-offs
**Evaluation criteria:** System design principles; Scalability and performance considerations; Trade-off analysis; Problem decomposition; Communication of design
**Common rejection reasons:** Inability to design scalable and robust systems.; Lack of understanding of trade-offs in system design.; Poor consideration of edge cases and failure scenarios.; Difficulty in communicating design choices.
## Questions

- Design a system like TinyURL.
- Design a news feed system for a social media platform.
- How would you design a rate limiter?

## Preparation tips

- Study common system design patterns and concepts.
- Practice designing systems like Twitter, Facebook News Feed, or a distributed cache.
- Be prepared to discuss trade-offs between different approaches (e.g., SQL vs. NoSQL, different caching strategies).
- Think about scalability, availability, and reliability.

## Round 4: Behavioral and Manager Interview
**Type:** Behavioral Interview · **Difficulty:** Medium · **Duration:** 45 min
Discuss past experiences and work situations using the STAR method.
This interview focuses on your past experiences and how you handle various work situations. You'll be asked behavioral questions designed to understand your work style, how you collaborate with others, handle challenges, and learn from mistakes. Using the STAR method (Situation, Task, Action, Result) is highly recommended for structuring your answers.
**Interviewers look for:** Examples of past behavior that predict future performance.; Ability to work effectively in a team.; Resilience and problem-solving skills.; Alignment with The Trade Desk's culture and values.
**Evaluation criteria:** Behavioral competencies; Teamwork and collaboration skills; Problem-solving approach in past situations; Adaptability and learning agility; Alignment with company values
**Common rejection reasons:** Poor cultural fit.; Lack of self-awareness.; Inability to provide specific examples for behavioral questions.; Negative attitude or lack of enthusiasm.
## Questions

- Tell me about a time you faced a significant technical challenge and how you overcame it.
- Describe a situation where you had to work with a difficult colleague. How did you handle it?
- Give an example of a time you failed. What did you learn from it?
- How do you prioritize your work when you have multiple competing deadlines?

## Preparation tips

- Prepare specific examples using the STAR method for common behavioral questions (teamwork, conflict resolution, leadership, failure, success).
- Reflect on your past projects and identify situations that demonstrate key competencies.
- Be honest and authentic in your responses.
- Show enthusiasm and a positive attitude.