PrimeXBT Interview Questions and Answers

The first round was a coding test, which was outsourced to an external vendor. I was asked 2 basic DSA questions, and there was discussions around the time and space complexity, and scope of optimizing the solutions. Post that there were a few questions around Spring Boot features and basic system design. The interviewer was professional throughout the interview, and the interview process felt more like a discussion, as compared to the standard interview process.

There was another round of coding - this time conducted by the organization itself. It consisted of a medium level DSA question on stacks. I wrote the code on my personal IDE and executed it there itself. The interviewer discussed about the possible edge cases and how I would deal with them. Post solving the question I was asked about my previous projects.

Q1. Discuss in detail about a scenario where a challenging production issue was handled.
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Q2. What are your responsibilities as a senior / team lead in the current organization?
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Q3. How did you handle conflicts with junior engineers and reporting managers?
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This was the final round where the discussion was largely around system design and HLD. It started off with questions are system design patterns and concepts. Then I was asked to design a booking design, with discussions around concurrency control and transaction management.

Q1. Hadoop architecture
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Q2. Spark architecture
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Q3. Difference between stage and task
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A stage is a collection of tasks that perform a specific computation, while a task is a unit of work that is executed on a single executor.
• Stage is a higher-level unit of work that can be broken down into multiple tasks.

• Tasks are individual units of work that are executed on a single executor.

• Stages are used to organize and coordinate tasks in a Spark job.

• Tasks are the actual units of computation that are performed by ...read more
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Q4. Sql questions to solve
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Q5. Scoop
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Q6. Action and transformation in pysaprk
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Actions and transformations are two types of operations in PySpark. Actions return a value to the driver program, while transformations create a new RDD.
• Actions are operations that trigger the execution of the Spark job, such as collect(), count(), and saveAsTextFile().

• Transformations are operations that create a new RDD from an existing one, such as map(), filter(), and reduceByKey().

• Actions are lazy operations, meani...read more
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Q7. Difference between rdd and dataframe
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RDD is a distributed collection of objects, while DataFrame is a distributed collection of data organized into named columns.
• RDD is more low-level and requires manual schema definition, while DataFrame provides a higher-level API with schema inference.

• DataFrames are optimized for processing structured data, while RDDs are more suitable for unstructured data.

• DataFrames support SQL queries and optimizations through Catal...read more
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3 dsa questions medium level

Q1. 2 medium level dp questions based on string and stocks
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Q2. One hard question based on graph
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Q1. Hr questions and java , springboot questions etc
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Q1. How will you prioritize testing ?
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I prioritize testing based on criticality, impact, dependencies, and risks involved.
• Identify critical functionalities and prioritize testing for them first

• Consider impact on end users and prioritize testing for high impact areas

• Take into account dependencies between different modules or components

• Assess risks involved and prioritize testing for high-risk areas

• Use risk-based testing approach to prioritize test cases
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Q2. Test cases for Landline
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Test cases for Landline phone functionality
• Test dialing a number and making a call

• Test receiving a call and answering it

• Test call waiting functionality

• Test call forwarding feature

• Test voicemail functionality
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Q1. SQL question on joins and subqueries?
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Q2. Earlier project questions ?
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Q1. How to design an app as a white labeled.
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Designing a white-labeled app involves creating a customizable platform that can be rebranded by different clients.
• Create a flexible design structure that allows for easy customization of colors, logos, and branding elements.

• Implement a robust admin panel where clients can easily upload their branding assets and make changes.

• Ensure that the app's functionality remains consistent across different branding variations.

• Con...read more
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Q2. Generic UI theme can be set via firebase. Set the theme of UI elements dynamically.
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Use Firebase to dynamically set the theme of UI elements.
• Create a collection in Firebase to store UI themes.

• Retrieve the selected theme from Firebase and apply it to UI elements.

• Update the UI elements whenever the theme is changed in Firebase.
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Q1. How to handle team, how do you ensure to follow agile and enable team to follow the same?
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Q1. Your biggest challenge in your career.
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Q2. Bring out some technical challenge or a challenge you faced while handling team.
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Q1. Data structures and algorithms
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Q2. Core + Advanced java
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Q1. Java data structures questions
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Q1. Manager round - Agile practices, overall about current project
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Q1. Which company do you work for and what is your post?
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Q2. What is your current salary and I will give you this much salary in my company
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Q1. 2Sum DSA leetcode problem
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2Sum problem involves finding two numbers in an array that add up to a specific target.
• Use a hashmap to store the difference between the target and each element in the array.

• Iterate through the array and check if the current element's complement exists in the hashmap.

• Return the indices of the two numbers that add up to the target.
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Q2. Spiral traversal of a Binary tree
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Spiral traversal of a Binary tree involves visiting nodes level by level alternating between left to right and right to left.
• Start by pushing the root node into a queue.

• While the queue is not empty, pop a node, print its value, and push its children into the queue.

• Alternate between popping nodes from the queue and printing their values in a spiral manner.
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Q1. A problem similar to coin change problem of leetcode
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Q2. Aggressive cows problem
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The aggressive cows problem involves finding the maximum distance between cows in a field while ensuring they are not too close to each other.
• Use binary search to find the maximum distance between cows.

• Sort the cows' positions and check if a certain distance is feasible.

• Consider the constraints of the problem such as the number of cows and the size of the field.
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Q1. Basic behavioural questions like why I am looking for a change and would I be able to handle the increased work pressure as I was shifting from MNC to a startup
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Q1. What did you study in your bachelors and how is it relevant to your job?
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Q2. How do you think you will succeed at Namaste credit?
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Q3. Why did you leave your last company?
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Q4. Talk about your previous work experience.
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