Greenway Health Data Engineer Interview Questions and Answers

Math and verbal round .

General topics to speak

Q1. Duplicates in array College Projects Hashmap implementation
Ans. 
Implement a function to find duplicates in an array of strings using Hashmap.
• Create a Hashmap to store the frequency of each string in the array

• Iterate through the array and check if the frequency of any string is greater than 1

• If yes, add it to the list of duplicates

• Return the list of duplicates
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Q1. Explain your previous projects
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Q1. How did you integrate MongoDB with Python in your earlier project
Ans. 
I used PyMongo library to connect to MongoDB and perform CRUD operations in Python
• Installed PyMongo library using pip

• Created a MongoClient object to connect to the MongoDB server

• Accessed the database and collection using the MongoClient object

• Performed CRUD operations using the collection object

• Used pymongo.cursor.Cursor to iterate over the query results
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English ang logical and aptitude test online

Q1. Round-1 tech after clearing aptitude test
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Q1. Round-2 technical after clearing Round-1 technical
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Q1. Tell me about your family
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Q2. You are immediately join are noy
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Q1. Tell me about yourself.
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Q1. What are your salary expectations
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Q2. What about your father
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Q3. Why should we hire you
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Q1. Why are you looking for a change?
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Q1. Asked to design airport tracking system
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Q2. Basic OOPs concepts questions
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Q1. High level OOPs concept questions and was asked to write psuedo code for a problem
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Q2. Asked about Djikstras algo and was asked psuedo code for it
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Q1. Basic HR questions, very chill
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Basic 10th standard level aptitude problem

Basic very easy level questions

Q1. Thorough with the basic knowledge of CS fundamentals
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Q2. 1. coding question - count the frequency of all chars in a word. 2. ACID properties. 3. swap 2 numbers without using any extra variable.
Ans. 
Count frequency of characters in a word, explain ACID properties, swap 2 numbers without extra variable.
• To count frequency of characters in a word, create a hashmap to store character counts.

• ACID properties in database: Atomicity, Consistency, Isolation, Durability.

• To swap 2 numbers without extra variable, use XOR operation: a = a ^ b, b = a ^ b, a = a ^ b.

• Example: word = 'hello', frequency = {'h': 1, 'e': 1, 'l': 2, '
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Q3. What will be your first step if client reports any issue
Ans. 
My first step would be to gather more information about the issue from the client.
• Ask the client to provide specific details about the issue such as when it occurred, what actions were taken before the issue occurred, and any error messages received.

• Try to replicate the issue on a test environment to understand the root cause.

• Communicate with the client to keep them updated on the progress and potential solutions.

• Prior...read more
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Q4. Try to reproduce the issue
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Q1. Solve Two sum problem
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Q2. What is threads?
Ans. 
Threads are lightweight processes within a program that can run concurrently, allowing for multitasking and improved performance.
• Threads share the same memory space within a process

• Threads can communicate with each other more easily than separate processes

• Examples include a web server handling multiple client requests concurrently
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