LatentView Analytics Senior Data Engineer Interview Questions and Answers

Q1. Starts with a introduction, Core Java concepts, OOPS concepts, Singleton design pattern, Spring boot annotations like service, restcontroller.
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Q2. DSA logical questions like 2nd highest number. How to find missing number from an array.
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Q1. Tell me about yourself.
Ans. 
I am a software engineer with 5 years of experience in developing web applications using Java, Spring Boot, and Angular.
• 5 years of experience in software development

• Proficient in Java, Spring Boot, and Angular

• Strong problem-solving skills

• Experience working in Agile development environment

• Bachelor's degree in Computer Science from XYZ University
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Q2. Tell me about your family.
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I come from a close-knit family of five, including my parents, older sister, and younger brother.
• Close-knit family of five

• Parents, older sister, and younger brother

• We enjoy spending time together traveling and trying new restaurants
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Q3. Why do you want to change the company
Ans. 
Seeking new challenges and opportunities for growth in a different environment.
• Desire for new challenges and learning opportunities

• Seeking a better work-life balance

• Interested in working with new technologies or industries

• Looking for a more collaborative team environment
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Q4. After that interviewer describes my work and position in the company.
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Leet code medium level question

Q1. About Java Streams
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Q2. Restful API coding completion based on given file
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Q1. To check your attitude
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Q2. Given detailed about company and what project you are going to work on?
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Q1. Hashmap working
Ans. 
Hashmap is a data structure that stores key-value pairs and allows for fast retrieval of values based on keys.
• Hashmap uses a hashing function to map keys to indices in an array.

• It allows for constant time complexity O(1) for insertion, deletion, and retrieval operations.

• Example: HashMap<String, Integer> map = new HashMap<>(); map.put("key", 123); int value = map.get("key");
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Q2. Multithreading cases
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Q3. Scenario specific on how to handle multiple events on a single variable to have accurate result
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Q4. Database indexing
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Q5. Architecture level
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Q1. Pyspark optimizations and theoretical questions
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Q2. Find the number of pairs which sum to target.
Ans. 
Count pairs in an array that sum up to a target value.
• Iterate through the array and store the frequency of each element in a hashmap.

• For each element, check if the difference between the target and the element exists in the hashmap.

• Increment the count of pairs if the difference is found in the hashmap.
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Q3. Binary search moderate problems of array ones increasing then decreasing
Ans. 
Binary search can be used to solve moderate problems of arrays that are first increasing and then decreasing.
• Use binary search to find the peak element in the array, which marks the transition from increasing to decreasing.

• Divide the array into two parts based on the peak element and apply binary search on each part separately.

• Handle edge cases such as when the array is strictly increasing or strictly decreasing.

• Exampl
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Q4. System design for a web surfing utility
Ans. 
Design a system for a web surfing utility
• Use a web crawler to gather data from websites

• Implement a search engine to retrieve relevant information

• Utilize a recommendation system to suggest related content

• Include user authentication and personalized settings

• Ensure scalability and performance for handling large amounts of data
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Q5. Smallest subarray having given target sum
Ans. 
Find the smallest subarray in an array that has a given target sum.
• Use a sliding window approach to find the subarray with the target sum.

• Keep track of the current sum of elements in the window and adjust the window size accordingly.

• Start with a window of size 1 and expand it until the sum is greater than or equal to the target sum.

• Shrink the window from the left side while updating the smallest subarray length until t
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I was given a test which was not that difficult

Q1. Why are you leaving the current job
Ans. 
Seeking new challenges and growth opportunities in a more innovative environment.
• Looking for new challenges and opportunities for growth

• Interested in working in a more innovative environment

• Seeking a change in company culture or work-life balance
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Q2. What's the driving factor for you to join Altair
Ans. 
The innovative projects and collaborative work environment at Altair are the driving factors for me to join.
• Innovative projects: I am excited about the opportunity to work on cutting-edge projects that push the boundaries of technology.

• Collaborative work environment: I value teamwork and believe that working with talented individuals at Altair will help me grow professionally.

• Company culture: I have heard great things ...read more
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Medium level of coding questions.

Q1. About azure data factory
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Q2. How to copy multiple csv into single file
Ans. 
Use a command line tool like cat to concatenate multiple CSV files into a single file
• Use the cat command in the terminal to concatenate multiple CSV files into a single file

• Navigate to the directory where the CSV files are located

• Run the command 'cat file1.csv file2.csv > combined.csv' to merge file1.csv and file2.csv into a new file named combined.csv
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Q1. What is hdinsights in azure data factory
Ans. 
HDInsight is a cloud-based service in Azure that makes it easy to process big data using Apache Hadoop, Spark, and other tools.
• HDInsight is a fully managed cloud service that makes it easy to process big data using open-source frameworks like Apache Hadoop, Spark, and more.

• It allows you to create, scale, and monitor Hadoop clusters in Azure.

• HDInsight integrates with Azure Data Factory to provide data orchestration and ...read more
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Q2. How to perform data copy in azure
Ans. 
Data copy in Azure can be performed using Azure Data Factory or Azure Storage Explorer.
• Use Azure Data Factory to create data pipelines for copying data between various sources and destinations.

• Use Azure Storage Explorer to manually copy data between Azure storage accounts.

• Utilize Azure Blob Storage for storing the data to be copied.
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Q1. Expectations in the company
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Q2. Ctc and relevant stuff
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Q1. How to configure vpn
Ans. 
To configure a VPN, you need to set up a VPN server, create user accounts, configure client devices, and establish secure connections.
• Set up a VPN server using software like OpenVPN or Windows Server

• Create user accounts with unique credentials for accessing the VPN

• Configure client devices to connect to the VPN server using the provided credentials

• Establish secure connections by encrypting data transmitted over the VPN
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Q2. System slowness how to resolve
Ans. 
To resolve system slowness, check for hardware issues, optimize software, update drivers, and monitor resource usage.
• Check for hardware issues such as low memory or CPU usage

• Optimize software by removing unnecessary programs or services

• Update drivers for hardware components

• Monitor resource usage to identify bottlenecks
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