Testbook.com Data Engineer Interview Questions and Answers

Two dynamic programming challenges at the hard level on LeetCode and 10 medium-level SQL challenge.

Q1. Android architecture mvvm mvc kotlin
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Q2. Coroutines flows
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Q1. Explain request lifecycle in rails?
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Request lifecycle in Rails involves routing, controller actions, rendering views, and responding to the client.
• 1. Request comes in through the browser or API endpoint.

• 2. Rails router determines which controller and action to route the request to.

• 3. Controller action processes the request, interacts with the model, and prepares data for the view.

• 4. View template is rendered with the data from the controller.

• 5. Response ...read more
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Q2. Code Merge Sort using Ruby
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Implement Merge Sort algorithm in Ruby
• Divide the array into two halves recursively

• Merge the sorted halves back together

• Use a helper method to merge the two halves
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DS algo questions with about 3 questions in topic like graph, strings ,arrays

Q1. DS algo question on LinkedIn list
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Q2. DS algo question on graph
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Asked 3 technical questions on heaps, Ll, treees

Verbal, logical, Quantative test

Q1. Self introduction
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Q1. The first round of interviews was smooth; I had to visit their office in Andheri and then have a face-to-face conversation with Neeraj sir (Hr). The questions were to introduce yourself, what is big data, ...read more
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Q2. After answering, he seemed somehow satisfied, but later he was encouraging me to enroll in their course and enhance my skills. And I'm still getting their emails and promotional messages for the same.
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Q1. The second round was on the call, which was rescheduled thrice. Then finally I got a call where Ashish sir (Hr) asked me to introduce myself, what are T&Z testing, overfitting, K neighbour algorithm, can w...read more
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Q2. The job position was for a fresher Data analyst, but they were asking questions related to Data scientist position. Basically, they were looking for a candidate who has hands-on experience with real-time d...read more
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Q1. Basics of js and react
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Q2. What are closures and give an example
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Closures are functions that have access to variables from their outer scope even after the outer function has finished executing.
• Closures are created when a function is defined within another function and has access to the outer function's variables.

• They can access variables from the outer function even after the outer function has returned.

• Closures are commonly used in event handlers and callbacks in JavaScript.
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Q3. What is event loop and features of es5
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Event loop is a mechanism that allows JavaScript to perform non-blocking operations by handling asynchronous events.
• Event loop is responsible for executing code, collecting and processing events, and executing queued sub-tasks.

• ES5 features include strict mode, JSON object, Array methods like forEach, map, filter, and reduce, and Object.create method.

• ES5 also introduced new methods for manipulating strings, such as trim
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Q1. General management round and past experience
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