Coupa Software Software Engineer Interview Questions + Guide in 2024

Welcome to our Coupa Software interview guide, hosted by Interview Query. Coupa Software is a prominent AI-driven platform that helps companies optimize sourcing, purchasing, supply chains, and financial management. Trusted by over 3,000 global organizations, Coupa aims to transform operating margins, increase efficiencies, and drive growth.

As a Software Engineer at Coupa, you’ll work in a dynamic environment focusing on developing, scaling, and optimizing the platform. The interview process typically includes multiple technical rounds that assess your skills in data structures and algorithms, system design, and coding abilities, primarily in languages such as Java, Ruby, and JavaScript.

In this guide, we’ll navigate through the interview process, commonly asked Coupa software engineer interview questions, and valuable tips to help you succeed. Let’s get started!

Recruiter/Hiring Manager Call Screening

Once your application is shortlisted, you will be contacted by a recruiter from Coupa’s Talent Acquisition Team. This initial call typically lasts around 30 minutes and includes verifying key details such as your work experiences, availability, and interest in the role. The recruiter may also ask general behavioral questions to assess your fit within Coupa’s culture.

Occasionally, the hiring manager may join this call to discuss the role in more detail and answer any specific questions you might have about the position or the company.

Online Assessment

To evaluate your technical proficiency, Coupa may require you to complete an online assessment. This assessment typically includes coding problems (Data Structures and Algorithms) and possibly an aptitude test. Here, you’ll need to solve around three coding questions within a given time frame, often 45 to 60 minutes.

Technical Virtual Interview

If you successfully pass the online assessment, you will be invited to participate in a series of virtual technical interviews. These interviews generally include three rounds:

1. First Technical Round: This round focuses on coding questions, particularly on Data Structures and Algorithms (DSA). You might face questions of easy to moderate difficulty. Additionally, there may be questions about your resume and previous projects.

2. Second Technical Round: This round assesses your knowledge in Object-Oriented Programming (OOP), Databases (DBMS), Low-Level Design (LLD), and development-related questions. Questions could be related to real-world scenarios and might include comparisons between sorting algorithms like merge sort and quick sort.

3. Third Technical Round: Another coding-focused interview where more in-depth DSA questions are asked.

Onsite Interview Rounds

If you clear the virtual interviews, you may be invited for onsite interviews, although this may also be conducted virtually due to logistics or pandemic constraints. The onsite interview rounds typically consist of:

1. Technical Round: Similar to the previous rounds but may include an additional focus on system design, class design, or developing a particular feature/UI.
2. Coding Challenges: Further coding and problem-solving questions, sometimes under a timed environment.
3. Behavioral Interviews: These interviews evaluate cultural fit, teamwork, and how you’ve handled various work situations in the past.
4. HR Round: A final round for discussing your career aspirations, company culture, and expectations. This may also include salary discussions and understanding your availability.

Typically, interviews at Coupa Software vary by role and team, but commonly software engineer interviews follow a fairly standardized process across these question topics.

1. How would you evaluate whether using a decision tree algorithm is the correct model for predicting loan repayment?

You are tasked with building a decision tree model to predict if a borrower will pay back a personal loan. How would you evaluate if a decision tree is the right choice, and how would you assess its performance before and after deployment?

2. How does random forest generate the forest, and why use it over logistic regression?

Explain the process by which a random forest generates its ensemble of trees. Additionally, discuss why one might choose random forest over logistic regression for certain problems.

3. When would you use a bagging algorithm versus a boosting algorithm?

Compare two machine learning algorithms. Describe scenarios where you would prefer a bagging algorithm over a boosting algorithm, and discuss the tradeoffs between the two.

4. How would you justify using a neural network to solve a business problem and explain its predictions to non-technical stakeholders?

Your manager asks you to build a model with a neural network. How would you justify the complexity of this model and explain its predictions to non-technical stakeholders?

5. What metrics would you use to track the accuracy and validity of a spam classifier for emails?

You are tasked with building a spam classifier for emails and have completed a V1 of the model. What metrics would you use to evaluate its accuracy and validity?

6. Write a SQL query to select the 2nd highest salary in the engineering department.

Write an SQL query to select the second-highest salary in the engineering department. If more than one person shares the highest salary, the query should select the next highest salary.

7. Write a function to merge two sorted lists into one sorted list.

Write a function to merge two sorted lists into one sorted list. Bonus: What’s the time complexity?

8. Write a function missing_number to find the missing number in an array.

You have an array of integers, nums of length n spanning 0 to n with one missing. Write a function missing_number that returns the missing number in the array. Complexity of (O(n)) required.

9. Write a function precision_recall to calculate precision and recall metrics from a 2-D matrix.

Given a 2-D matrix P of predicted values and actual values, write a function precision_recall to calculate precision and recall metrics. Return the ordered pair (precision, recall).

10. Write a function to search for a target value in a rotated sorted array.

Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand. You are given a target value to search. If the value is in the array, then return its index; otherwise, return -1. Bonus: Your algorithm’s runtime complexity should be in the order of (O(\log n)).

11. Would you think there was anything fishy about the results of an A/B test with 20 variants?

Your manager ran an A/B test with 20 different variants and found one significant result. Would you suspect any issues with these results?

12. How would you set up an A/B test to optimize button color and position for higher click-through rates?

A team wants to A/B test changes in a sign-up funnel, such as changing a button from red to blue and/or moving it from the top to the bottom of the page. How would you design this test?

13. What would you do if friend requests on Facebook are down 10%?

A product manager at Facebook reports a 10% decrease in friend requests. What steps would you take to address this issue?

14. Why would the number of job applicants decrease while job postings remain the same?

You observe that the number of job postings per day has remained constant, but the number of applicants has been decreasing. What could be causing this trend?

15. What are the drawbacks of the given student test score datasets, and how would you reformat them for better analysis?

You have data on student test scores in two different layouts. What are the drawbacks of these formats, and what changes would you make to improve their usefulness for analysis? Additionally, describe common problems in “messy” datasets.

16. Is this a fair coin based on 10 flips resulting in 8 tails and 2 heads?

You flipped a coin 10 times, resulting in 8 tails and 2 heads. Determine if this coin is fair based on the observed outcomes.

17. How do you write a function to calculate the sample variance of a list of integers?

Write a function that takes a list of integers and outputs the sample variance, rounded to 2 decimal places. For example, given test_list = [6, 7, 3, 9, 10, 15], the function should return 13.89.

18. Is there anything suspicious about an A/B test with 20 variants where one variant is significant?

Your manager ran an A/B test with 20 different variants and found one variant to be significant. Evaluate whether these results are suspicious.

19. How do you find the median of a sorted list where more than 50% of the list is the same integer in O(1) time and space?

Given a sorted list of integers where more than 50% of the list is the same repeating integer, write a function to return the median value in (O(1)) computational time and space. For example, given li = [1,2,2], the function should return 2.

20. What are the drawbacks of the given student test score data layouts, and how would you reformat them for better analysis?

You have data on student test scores in two different layouts. Identify the drawbacks of these layouts, suggest formatting changes to make the data more useful for analysis, and describe common problems seen in “messy” datasets.

Here are some quick tips to help you prepare for a software engineer interview at Coupa:

• Strong Core Concepts: Ensure your understanding of core Computer Science concepts like Data Structures, Algorithms, OOP, DBMS, and system design is solid. Coupa’s interviews frequently test these areas.
• Project Experience: Be prepared to discuss your past projects in detail, particularly focusing on the technologies used, challenges faced, and how you applied different concepts (like OOP) in your project.
• Communication Skills: Practice explaining technical concepts clearly and concisely. Interviewers at Coupa value candidates who can communicate their thought processes effectively. Consider trying our Mock Interview platform or AI interviewer to help you improve your communication skills.

What is the average salary for a Software Engineer at Coupa Software?

What is the company culture like at Coupa Software?

Coupa Software fosters a collaborative and inclusive environment that emphasizes customer success, results-oriented approaches, and a commitment to excellence. The company values innovation, integrity, and accountability, encouraging employees to continually improve processes and deliver outstanding results. Leadership is approachable, and team members are supportive, frequently working in agile and fast-paced settings.

What are some of the benefits of working at Coupa Software?

Working at Coupa offers you exposure to cutting-edge AI-driven platforms and the opportunity to make impactful contributions to global supply chains and financial management systems. The diverse and inclusive workplace promotes professional growth, with ongoing opportunities for skill enhancements and career advancements.

As Coupa Software continues to redefine how businesses operate through its innovative AI-driven platform, and they’re on the lookout for passionate and skilled Software Engineers to join their dynamic team.

Remember, your journey with Coupa involves tackling technical challenges and contributing to an environment that values customer success, innovation, and collaboration.

Good luck with your interview!