65 questions · from 5 interviews
Athenahealth interview questions
Every question candidates reported from their Athenahealth interviews, most frequently asked first. Each links to the write-up it came from, so you can see the round and how it went.
Athenahealth coding and DSA questions
- 01
Implement Singleton Design Pattern with Volatile
Implement the Singleton Design Pattern, specifically discussing the use of a volatile object for thread safety, and also discussing the concept of volatile.
- 02
Longest Increasing Continuous Subarray
Find the length of the longest increasing continuous subarray. I clarified edge cases, and the interviewer mentioned that only one valid sequence exists. I was asked to test multiple scenarios.
- 03
Repeated Substring Pattern
Given a string s, check if it can be constructed by taking a substring of it and appending multiple copies of the substring together.
- 04
Sort Colors
Given an array nums with n objects colored red, white, or blue, sort them in-place so that objects of the same color are adjacent, with the colors in the order red, white, and blue. We will use the integers 0, 1, and 2 to represent the color red, white, and…
- 05
Best Time to Buy and Sell Stock II
You are given an integer array prices where prices[i] is the price of a given stock on the i-th day. On each day, you may decide to buy and/or sell the stock. You can only hold at most one share of the stock at any time. However, you can buy it then…
- 06
Equal String Operations
Given two strings str1 and str2, check if str1 can be made equal to str2 using operations to remove the first character of str1 and insert at any position. If possible, return the minimum number of operations; else return -1.
- 07
Word Matching with Transformations
Two strings a and b are considered matching if a can be converted to b using: Swap adjacent characters. Select substring of length k1 with identical characters and increment all to next alphabet. Given two arrays of strings, determine for each pair whether…
- 08
Min Heap Operations
Given a binary min heap 5,7,6,10,9,12,11,13, what is the level order after 2 extract-min operations?
- 09
Doubly Linked List Properties
What are the correct properties of a doubly linked list? (a) linear or circular, (b) same space as singly linked lists, (c) Needs a header. Choose the correct combination (e.g., 1) a, b; 2) b, c).
Easy · From Athena Health On-Campus Experience — 2025
- 10
Merge Sort Time Complexity
Given the merge sort code, what is its time complexity?
Easy · From Athena Health On-Campus Experience — 2025
- 11
Valid Parentheses
A coding question like Valid Parentheses was asked.
Easy · From Athena Health On-Campus Experience — 2025
- 12
Palindrome Number (Optimized)
Given an integer, determine if it is a palindrome. An optimized approach was requested.
Easy · From Athena Health On-Campus Experience — 2025
- 13
Sorting Algorithm Pseudocode
Provide pseudocode for a sorting algorithm.
- 14
Longest Substring with Unique Characters
A coding question on finding the longest substring with unique characters.
Medium · From Athena Health On-Campus Experience — 2025
- 15
Check String Presence in Long String
Given an array of strings, check if these strings are present in a longer string.
- 16
Search in Rotated Sorted Array
Given a rotated sorted list, return the index of a specific key.
Medium · From Athena Health On-Campus Experience — 2025
- 17
Move Zeroes
Given an array, move all zeroes to the end of it while maintaining the relative order of the non-zero elements.
Easy · From Athena Health On-Campus Experience — 2025
- 18
Difference Between Dates
A coding question to find the difference between two dates.
- 19
Tree Traversals, Height, and Balanced Trees
Questions about tree traversals, calculating tree height, and properties of balanced trees.
- 20
Internal Working of HashMap
Describe the internal working mechanism of a HashMap, including collision resolution and resizing.
Medium · From Athenahealth | MTS | Interview Experience
- 21
Thief and Warehouses
Chef has N warehouses. Each warehouse has some quantity of food. Chef hires M thieves. Each thief has some capacity. A thief can take food from only one warehouse, but he can take it from any warehouse. Chef gives some money to each thief and a maximum…
- 22
Alice and String Game
Alice and Bob are playing a game with a string S of length N. The string S consists of lowercase English letters. Alice and Bob take turns to play the game. Alice plays first. In each turn, a player can choose any character and replace it with any other…
Easy · From Athenahealth | MTS | Interview Experience
- 23
Longest Subsequence of X that is Substring of Y
Given two strings X and Y of length N and M respectively. The task is to find the length of the longest subsequence of string X which is a substring in sequence Y.
- 24
Longest Substring Without Repeating Characters
Find the length of the longest substring without repeating characters. This is a classic problem often found on platforms like LeetCode.
Medium · From ATHENAHEALTH | MTS | CHENNAI | GHOSTED
- 25
2 more in the Athenahealth write-ups.
Athenahealth system design questions
- 01
Design Data Entities for Different Mappings
Design data entities to represent various relationships: one-to-one (1-1), one-to-many (1-N), and many-to-many (N-N) mappings, providing real-world examples for each.
- 02
Design a School Identity Management System with Query
Design a database schema for a School Identity Management System. The system should manage entities such as Students, Subjects, Examination types (e.g., half-yearly, quarterly, annual), Marks, and Classes. Additionally, write a SQL query to identify the…
- 03
Design Book My Show
I was asked to design Book My Show. This included designing the database schema for entities like Users, Shows, Seats, Bookings, and Payments. I also had to write a join query based on my architecture and discuss my design choices.
- 04
Estimation: Coffee Shops in an Area
An estimation question: how many coffee shops are in a given area, based on preference data?
- 05
Project High-Level Architecture
Discuss the high-level architecture of a project you have worked on.
- 06
Design Calculator for Huge Numbers
Design a basic calculator capable of performing fundamental arithmetic operations (addition, subtraction, multiplication, division) on extremely large numbers, potentially up to billions or trillions. Consider challenges related to data storage, arithmetic…
Hard · From Athenahealth | MTS | Interview Experience
- 07
Low-Level Design: Restaurant Ordering System
Design a restaurant ordering system. This includes designing the database schema, defining classes, outlining microservice architecture, and specifying APIs.
Hard · From ATHENAHEALTH | MTS | CHENNAI | GHOSTED
Athenahealth behavioural and HR questions
- 01
Discuss Biggest Problem/Project
I was asked to describe the biggest problem or project I have solved and my approach to it.
- 02
Most Complex Project Deep Dive
What is the most complex project you have worked on? Please deep dive a little bit into its details, challenges, and your contributions.
- 03
Handling PR Reviewer Comments
What would you do when you raise a Pull Request (PR) and the reviewer comments suggest changes that you believe could not work in your specific case or context?
- 04
Company Evolution Reflection
How are things different in the company/team presently compared to when you first joined?
- 05
Disagreement with Manager on Solution
How do you handle a situation where your idea for developing a solution differs significantly from your manager's idea?
Athenahealth other questions
- 01
Difference between @Controller and @RestController in Spring Boot
Explain the key differences and appropriate use cases for @Controller versus @RestController annotations in Spring Boot.
- 02
JSON to POJO Conversion in Spring Boot (Jackson)
Explain the mechanism by which a JSON request payload is converted into a Plain Old Java Object (POJO) within a Spring Boot application, specifically detailing the role of Jackson.
- 03
AWS: Create API Gateway
Given a terminal, I was asked to create an API Gateway on AWS.
- 04
AI Applications in Real-World Systems
We had a general discussion around AI and how it can be applied in real-world systems.
- 05
Daily Wages Calculation (SQL)
Tables: laborers (id, name, previousbalance) and dailyhours (laborid, entrytime, exittime). Pay = $30 totalhoursworked + previousbalance. Write a query to return all active employees (worked some hours), with total amount owed, sorted by name. Entry and exit…
- 06
Database View Size Estimation
An employee table has 10 columns and 1 million rows, with a size of 50 MB. If a view is created with 5 columns and 1 million rows from this table, what would be the size of the view?
- 07
SQL Join based on Condition
Given a set of tables, I was asked to join them based on a specific condition.
- 08
Explain CRUD Operations
Explain Create, Read, Update, Delete (CRUD) operations.
Easy · From Athena Health On-Campus Experience — 2025
- 09
Explain ACID Properties
Explain the ACID properties (Atomicity, Consistency, Isolation, Durability) in databases.
Easy · From Athena Health On-Campus Experience — 2025
- 10
Explain Authorization
Explain the concept of Authorization.
- 11
Explain SQL Inner Join
Explain the concept of SQL Inner Join.
Easy · From Athena Health On-Campus Experience — 2025
- 12
Three Mislabelled Boxes Puzzle
A logical question: three boxes are labelled incorrectly. How can you find the correctly labelled box with minimal moves?
- 13
OOPS Design: Coffee Machine
Design a coffee machine using Object-Oriented Programming (OOP) principles.
- 14
Call by Reference vs. Call by Value
Explain the difference between call by reference and call by value.
Easy · From Athena Health On-Campus Experience — 2025
- 15
Interfaces and Multiple Inheritance
Provide an example illustrating interfaces and multiple inheritance.
- 16
Explain Polymorphism and Encapsulation
Explain the concepts of polymorphism and encapsulation in OOP.
Easy · From Athena Health On-Campus Experience — 2025
- 17
SQL Group By with Count
Explain and demonstrate the use of SQL GROUP BY clause with COUNT aggregate function.
Easy · From Athena Health On-Campus Experience — 2025
- 18
Database Cache Memory with Update Example
Explain cache memory in a database context, including an update example.
- 19
8 Balls, 1 Heavier Puzzle
A puzzle: given 8 balls, one is heavier. Find the heavier ball using only 2 weighings.
- 20
Prevent Race Conditions During Concurrent Updates
How do you prevent race conditions when dealing with concurrent updates in a system?
- 21
N+1 Problem in Hibernate
Explain the N+1 problem in Hibernate and how to mitigate it.
- 22
Transactional Annotation Isolation Levels
Discuss the different isolation levels available with transactional annotations and their implications.
- 23
Eager and Lazy Initialization
Explain the concepts of eager initialization and lazy initialization, and provide examples of when to use each.
- 24
Design Patterns: Builder and Singleton
Explain the Builder and Singleton design patterns, their use cases, advantages, and disadvantages.
- 25
Spring Boot REST CRUD APIs for Employee DB
Design and implement Spring Boot REST CRUD APIs for an employee database.
1 more in the Athenahealth write-ups.
Athenahealth interview questions FAQ
What questions are asked in Athenahealth interviews?
Candidates reported 65 distinct questions across 5 Athenahealth interviews. 27 coding and DSA questions, 7 system design questions, 5 behavioural and HR questions, 26 other questions.
How difficult are Athenahealth interview questions?
Of the questions candidates rated, 67% were easy, 22% medium and 11% hard.