Oxigen Services Interview Questions and Answers

Soo easy aptitude exam asked questions

Q1. What is oops in Java,fibo, and sorting
Ans. 
OOPs in Java refers to Object-Oriented Programming concepts, fibo likely refers to Fibonacci sequence, and sorting refers to arranging elements in a specific order.
• OOPs in Java includes concepts like classes, objects, inheritance, polymorphism, and encapsulation.

• Fibo likely refers to the Fibonacci sequence, where each number is the sum of the two preceding ones (e.g. 0, 1, 1, 2, 3, 5, ...).

• Sorting involves arranging el...read more
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Q2. Why is garbage collector is used in java etc more of java questions
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Q3. Can main can be overloaded and overrided
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Yes, main can be overloaded but not overridden in C++.
• Main can be overloaded by defining multiple functions with different parameters.

• Example: int main() and int main(int argc, char* argv[])

• Main cannot be overridden as it is a static function of the program.
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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. Core java - collection framework
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Q1. Advance java - spring boot
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Q1. Tell me about yourself
Ans. 
I am a dedicated and hardworking individual with a passion for helping others and a strong background in customer service.
• Customer service experience in retail and hospitality industries

• Strong communication and problem-solving skills

• Passionate about making a positive impact in the community
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Q2. What is your greatest strength
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My greatest strength is my ability to adapt to new situations and learn quickly.
• Quick learner

• Adaptable to change

• Problem solver

• Strong work ethic
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Q1. Tell me about yourself
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I am a dedicated and hardworking individual with a passion for learning and helping others.
• I have a background in marketing and have worked in the industry for 5 years.

• I am currently pursuing a degree in psychology to further my understanding of human behavior.

• I enjoy volunteering at local shelters and organizing community events.

• I am fluent in Spanish and have traveled to several Spanish-speaking countries.
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Q2. What is your greatest weakness
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My greatest weakness is that I tend to be overly critical of my own work, which can sometimes lead to self-doubt.
• I have a tendency to overanalyze my work and focus on minor details

• I often struggle with feeling like my work is never good enough

• I have difficulty accepting praise or recognition for my accomplishments
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Q1. Feafeafgeg geage
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Q2. G eg rg r
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Java coding questions, basic Java questions.

Q1. Java basics questions.
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Q2. Live coding.
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Q1. Discussion on previous experience and projects.
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Q2. System design question
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Q1. Questions on SQL, Java advanced, personal projects, Java frameworks, UI based questions, Agile methodologies.
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Q2. Interview discussion with the whole team.
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Q1. Benefits discussion.
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Q2. Salary discussion.
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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
Ans. 
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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