29 questions · from 2 interviews · 1 asked more than once
Coupa Software interview questions
Every question candidates reported from their Coupa Software interviews, most frequently asked first. Each links to the write-up it came from, so you can see the round and how it went.
Coupa Software coding and DSA questions
- 01
Longest Substring Without Repeating Characters
Find the length of the longest substring in a given string that does not contain any repeating characters.
Medium · Asked 2 times · From My Interview Experience at Coupa Software for ASDE (FTE 2026)
- 02
Merge Sort Logic
Implement merge sort logic and provide pseudo code.
Medium · From My Interview Experience at Coupa Software for ASDE (FTE 2026)
- 03
Reverse a String
Reverse a given string.
Easy · From My Interview Experience at Coupa Software for ASDE (FTE 2026)
- 04
Remove Duplicates from Array
Remove duplicate elements from an array.
Easy · From My Interview Experience at Coupa Software for ASDE (FTE 2026)
- 05
In-order Traversal of BST using Stack
Perform an in-order traversal of a Binary Search Tree (BST) using an iterative approach with a stack.
Medium · From My Interview Experience at Coupa Software for ASDE (FTE 2026)
- 06
DFS vs BFS Comparison
Discuss the advantages and disadvantages of Depth-First Search (DFS) and Breadth-First Search (BFS) algorithms.
Easy · From My Interview Experience at Coupa Software for ASDE (FTE 2026)
- 07
Edges to Reach Key in Tree
Given a tree and a key, calculate the number of edges required to reach that key from the root.
Easy · From My Interview Experience at Coupa Software for ASDE (FTE 2026)
- 08
Maximum Height of a Tree
Calculate the maximum height of a given tree.
Easy · From My Interview Experience at Coupa Software for ASDE (FTE 2026)
- 09
Minimum Height of a Tree
Calculate the minimum height of a given tree.
Easy · From My Interview Experience at Coupa Software for ASDE (FTE 2026)
- 10
Sum of All Heights from Root Nodes of BST
Calculate the sum of all heights from the root nodes of a Binary Search Tree (BST).
Medium · From My Interview Experience at Coupa Software for ASDE (FTE 2026)
- 11
Lowest Common Ancestor (LCA) of Two Nodes
Explain how to calculate the Lowest Common Ancestor (LCA) of two nodes in a tree.
Medium · From My Interview Experience at Coupa Software for ASDE (FTE 2026)
- 12
Find Missing Integer in Array
I was tasked with finding the missing integer within a given array.
Easy · From Coupa Software | Interview Experience | Full-Time
- 13
Complex SQL Query: Average Price with Joins
I was given a challenging SQL query problem that involved calculating the average price, requiring the use of database joins.
Medium · From Coupa Software | Interview Experience | Full-Time
- 14
Radix Sort Explanation
I explained the Radix Sort algorithm and its working principles.
Coupa Software system design questions
- 01
Explain DNS in Depth
Explain the Domain Name System (DNS) in detail.
From My Interview Experience at Coupa Software for ASDE (FTE 2026)
- 02
URL Shortener Workflow
Describe the high-level flow and working mechanism of a URL shortener, including how it works, why it works, and what a URL comprises of (protocol, domain name, route, query).
Medium · From My Interview Experience at Coupa Software for ASDE (FTE 2026)
- 03
Design an API Gateway
Design an API Gateway. I was asked to design various components and entities, estimate the number of schemas required (roughly), and discuss follow-up scenarios: What if Redis goes down? What if the logging worker goes down? What happens in the celebrity…
Hard · From My Interview Experience at Coupa Software for ASDE (FTE 2026)
- 04
REST API Methods: PUT vs. PATCH, GET vs. POST
I discussed various REST API concepts, including the differences between PUT and PATCH, and GET versus POST methods.
- 05
Database Optimization Techniques
I answered questions focusing on various database optimization techniques.
- 06
MySQL vs. MongoDB: Use Case Analysis
I discussed the trade-offs and appropriate use cases for MySQL and MongoDB. I was also presented with a scenario involving a website and asked to justify which database would be more suitable and why.
- 07
Low-Level Design (LLD) for an Elevator System
I was tasked with designing a Low-Level Design (LLD) for an elevator system.
Medium · From Coupa Software | Interview Experience | Full-Time
Coupa Software other questions
- 01
OOPs Concepts: Inheritance, Abstraction vs. Encapsulation
I had a discussion on core Object-Oriented Programming (OOPs) concepts, specifically focusing on Inheritance and the distinctions between Abstraction and Encapsulation.
- 02
Class-Based vs Functional Components
I answered technical questions comparing and contrasting class-based and functional components.
- 03
Cookie vs. Local Storage vs. Session Storage
I discussed the differences and use cases for cookies, local storage, and session storage.
- 04
Redux Toolkit Functionality
I explained how Redux Toolkit works and its core principles.
- 05
Database Schema Design
I answered questions related to database schema design.
- 06
Debouncing, Lazy Loading, and Caching Concepts
I discussed concepts such as debouncing, lazy loading, and caching mechanisms.
- 07
Classic Jar Puzzle: Find Contaminated Pills
I solved the classic jar puzzle where I needed to find the jar with contaminated pills using a balance scale or similar method.
- 08
Polymorphism with Virtual Keyword
I discussed polymorphism in Object-Oriented Programming, specifically focusing on the use and implications of the virtual keyword.
Coupa Software interview questions FAQ
What questions are asked in Coupa Software interviews?
Candidates reported 29 distinct questions across 2 Coupa Software interviews. 14 coding and DSA questions, 7 system design questions, 8 other questions.
Which Coupa Software interview questions are asked most often?
The most repeated are "Longest Substring Without Repeating Characters" (2 times).
How difficult are Coupa Software interview questions?
Of the questions candidates rated, 44% were easy, 50% medium and 6% hard.