# Software Engineer
**Role:** Software Engineer · **Level:** SDE 1
**Company:** [Groupon](https://scaleengineer.com/companies/groupon)
**Difficulty:** Medium
**Salary:** US$85000 - US$110000
**Experience:** 0 - 2
**Timeline:** ~7 days
The Software Engineer (SDE 1) interview at Groupon is designed to assess a candidate's foundational programming 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, and concluding with a behavioral or managerial interview to gauge teamwork and alignment with Groupon's values.
Canonical: https://scaleengineer.com/interviews/groupon/sde-1-software-engineer
---
## Overall evaluation

- Technical Skills
- Behavioral and Cultural Fit

## Questions asked

- Write a function to reverse a linked list.
- Given an array of integers, find the two numbers that add up to a specific target.
- Explain the difference between a process and a thread.
- Describe a situation where you had to deal with a difficult stakeholder.
- How would you design a URL shortener (high-level)?
- What are your favorite programming languages and why?
- Tell me about a time you made a mistake and how you handled it.

## 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 Big O notation for time and space complexity.
- Brush up on object-oriented programming (OOP) principles.
- Prepare to discuss your past projects, highlighting your contributions and the challenges you faced.
- Research Groupon's products, services, and company culture.
- Prepare answers to common behavioral questions using the STAR method (Situation, Task, Action, Result).
- Have a list of thoughtful questions to ask the interviewer about the role, team, and company.

### studyPlan

- {"title":"Data Structures Fundamentals","longDescription":"Weeks 1-2: Focus on core data structures like arrays, linked lists, stacks, queues, and hash maps. Practice problems related to these structures, emphasizing time and space complexity analysis. Cover basic sorting and searching algorithms.","shortDescription":"Weeks 1-2: Data Structures (Arrays, Linked Lists, Hash Maps) & Basic Algorithms (Sorting, Searching)."}
- {"title":"Advanced Data Structures and Algorithms","longDescription":"Weeks 3-4: Dive into more complex data structures such as trees (binary trees, BSTs, AVL trees) and graphs. Study graph traversal algorithms (BFS, DFS) and tree traversal algorithms. Practice problems involving these structures.","shortDescription":"Weeks 3-4: Advanced Data Structures (Trees, Graphs) & Algorithms (BFS, DFS)."}
- {"title":"Algorithmic Techniques","longDescription":"Week 5: Focus on dynamic programming and recursion. Understand how to break down problems into smaller subproblems and build up solutions. Practice DP problems.","shortDescription":"Week 5: Dynamic Programming & Recursion."}
- {"title":"Behavioral and Company Preparation","longDescription":"Week 6: Prepare for behavioral questions. Review your resume and identify key projects and experiences. Practice answering common behavioral questions using the STAR method. Research Groupon's values and prepare questions for the interviewer.","shortDescription":"Week 6: Behavioral Prep & Company Research."}
- {"title":"Final Preparation","longDescription":"Week 7: Mock interviews and final review. Conduct mock interviews to simulate the actual interview environment. Review all topics covered and focus on areas where you feel less confident. Ensure you have a clear understanding of your resume and projects.","shortDescription":"Week 7: Mock Interviews & Final Review."}

## Location differences

- {"location":"Remote","differences":{"tips":["Be prepared to discuss your projects in detail.","Emphasize collaboration and communication skills.","Showcase your eagerness to learn and adapt."],"interviewFocus":["Understanding of core Java/Python/etc. concepts.","Ability to write clean, efficient, and testable code.","Problem-solving approach and logical thinking."],"commonQuestions":["Tell me about a challenging project you worked on.","How do you handle disagreements within a team?","Describe a time you had to learn a new technology quickly."]}}
- {"location":"On-site (Chicago)","differences":{"tips":["Research Groupon's mission, values, and recent news.","Prepare specific examples to answer behavioral questions.","Ask thoughtful questions about the team and the company culture."],"interviewFocus":["Cultural fit and alignment with Groupon's values.","Communication and interpersonal skills.","Understanding of the role and the company."],"commonQuestions":["Walk me through your resume.","Why are you interested in Groupon?","What are your strengths and weaknesses?"]}}

## Round 1: Coding Challenge
**Type:** Technical Interview - Coding · **Difficulty:** Medium · **Duration:** 45 min
Solve coding problems focusing on data structures and algorithms.
This round focuses on assessing your core programming skills. You will be asked to solve one or two coding problems, typically involving data structures and algorithms. The interviewer will evaluate your ability to write clean, efficient, and correct code, as well as your problem-solving approach and how you communicate your thought process.
**Interviewers look for:** A candidate who can translate a problem into working code.; Someone who can think critically and break down complex problems.; A candidate who can explain their reasoning clearly.; Someone who considers edge cases and potential improvements.
**Evaluation criteria:** Correctness of the solution; Efficiency of the solution (time and space complexity); Code clarity and readability; Problem-solving approach; Ability to communicate the solution
**Common rejection reasons:** Inability to articulate thought process.; Poor code quality (not readable, inefficient).; Fundamental misunderstanding of data structures or algorithms.; Failure to handle edge cases.
## Questions

- Given a binary tree, determine if it is a valid binary search tree.
- Find the kth smallest element in a sorted matrix.

## Preparation tips

- Practice coding on a whiteboard or a shared editor.
- Talk through your solution as you write it.
- Ask clarifying questions about the problem statement.
- Consider different approaches and their trade-offs.
- Test your code with various inputs, including edge cases.

## Round 2: Computer Science Fundamentals
**Type:** Technical Interview - CS Fundamentals · **Difficulty:** Medium · **Duration:** 45 min
Assess understanding of CS fundamentals and basic system design.
This round delves deeper into your understanding of computer science principles beyond just coding. You might be asked questions about operating systems, databases, networking, or basic system design. The goal is to assess your foundational knowledge and how you apply it to solve problems.
**Interviewers look for:** A candidate with a solid understanding of computer science fundamentals.; Someone who can think about how different components of a system interact.; A candidate who can explain technical concepts clearly.; Someone who can discuss trade-offs in design choices.
**Evaluation criteria:** Understanding of core CS concepts (e.g., operating systems, databases, networking).; Ability to apply theoretical knowledge.; Problem-solving skills in a broader context.; Communication of technical concepts.
**Common rejection reasons:** Lack of understanding of fundamental CS concepts.; Inability to apply theoretical knowledge to practical problems.; Poor communication of technical ideas.; Not being able to explain trade-offs of different approaches.
## Questions

- Explain the difference between TCP and UDP.
- What is a deadlock and how can it be prevented?
- Describe the ACID properties in database transactions.

## Preparation tips

- Review fundamental concepts of operating systems (processes, threads, memory management).
- Brush up on database concepts (SQL, NoSQL, indexing).
- Understand basic networking protocols (TCP/IP, HTTP).
- Think about how you would approach designing simple systems.
- Be prepared to explain concepts in your own words.

## Round 3: Behavioral and Managerial Fit
**Type:** Behavioral Interview · **Difficulty:** Medium · **Duration:** 30 min
Assess behavioral competencies, motivation, and cultural fit.
This round is focused on understanding your personality, work style, and how you align with Groupon's culture. You'll be asked behavioral questions about past experiences, teamwork, and how you handle challenges. The interviewer will also assess your motivation for joining Groupon and your career aspirations.
**Interviewers look for:** A candidate who is a good cultural fit for Groupon.; Someone who can work effectively in a team.; A candidate who is motivated and passionate about their work.; Someone who demonstrates self-awareness and a willingness to learn.
**Evaluation criteria:** Behavioral competencies (teamwork, communication, problem-solving).; Motivation and passion for the role and company.; Cultural fit and alignment with Groupon's values.; Career goals and aspirations.
**Common rejection reasons:** Poor communication skills.; Inability to provide specific examples.; Lack of self-awareness.; Not demonstrating alignment with company values.; Negative attitude or lack of enthusiasm.
## Questions

- Tell me about a time you had to work with a difficult team member.
- Describe a project you are particularly proud of and why.
- How do you stay updated with new technologies?

## Preparation tips

- Prepare specific examples using the STAR method.
- Be honest and authentic in your responses.
- Show enthusiasm for the role and the company.
- Ask thoughtful questions about the team and work environment.
- Reflect on your strengths and weaknesses.