NJ Technologies Jr. Data Scientist Interview Questions and Answers

Code was of leetcode medium level.

Q1. Easy level DS code
Add your answer
Q2. Question related to database
Add your answer

Q1. Questions related to SQL
Add your answer
Q2. Inner join of three tables
Ans. 
Inner join of three tables in SQL
• Use the JOIN keyword to combine three tables based on a common column

• Specify the columns to select from each table

• Use the ON keyword to specify the join condition
Answered by AI
Add your answer
Q3. What is cross join
Ans. 
Cross join is a type of join operation in SQL that returns the Cartesian product of two tables.
• Cross join does not require any matching condition between the tables.

• It combines each row from the first table with every row from the second table.

• Cross join can result in a large number of rows if the tables are big.

• Example: SELECT * FROM table1 CROSS JOIN table2;
Answered by AI
Add your answer

Online apitude containing 10 question without camera

Logical reasoning ,verbal aptitude , two java program and html
duration 1hr

Hand written java coding 5 problem statement oops, String, Arrays and others

Q1. About infiniti software solution
Add your answer
Q2. Questions in java
Add your answer

It was simple and easily solvable.

There was 2 programs must pass the testcases.

There was written test of programming.

Q1. Why you choose infiniti
Ans. 
I chose Infiniti for its innovative culture, commitment to excellence, and opportunities for professional growth in software development.
• Innovative Culture: Infiniti fosters creativity, allowing developers to work on cutting-edge technologies like AI and machine learning.

• Commitment to Excellence: The company's focus on high-quality software aligns with my personal values of delivering robust and reliable solutions.

• Prof...read more
Answered by AI
Add your answer
Q2. Share about your self
Ans. 
I am a passionate software developer with a strong background in full-stack development and a love for problem-solving.
• Education: Bachelor's degree in Computer Science from XYZ University.

• Experience: 3 years of experience in developing web applications using React and Node.js.

• Projects: Developed an e-commerce platform that increased sales by 30% within the first quarter.

• Skills: Proficient in JavaScript, Python, and SQL...read more
Answered by AI
Add your answer

Q1. Oops concepts in java
Ans. 
OOP concepts in Java include encapsulation, inheritance, polymorphism, and abstraction, enabling modular and reusable code.
• Encapsulation: Bundling data and methods that operate on the data within a single unit (class). Example: private variables with public getters/setters.

• Inheritance: Mechanism where one class inherits properties and behaviors from another. Example: class Dog extends Animal.

• Polymorphism: Ability to pr...read more
Answered by AI
Add your answer
Q2. Features
Add your answer

Chrome and Firefox Browser automation

Log file tail last n lines where n is configurable. Followup question on how you can optimize it further incase log file size is in TBs and incase it is cluster of servers

Q1. Detailed Technical background check and discussion on past projects.
Add your answer
Q2. Messaging queue and best practices
Ans. 
Messaging queues are used to manage asynchronous communication between different components of a system.
• Use a reliable messaging queue system like RabbitMQ or Apache Kafka

• Ensure messages are properly formatted and serialized

• Implement message acknowledgement and retry mechanisms

• Monitor queue health and performance

• Consider message ordering and partitioning for scalability

• Avoid long-running tasks in message handlers
Answered by AI
Add your answer
Q3. Binary Search Tree twisted question
Add your answer
Q4. Map Reduce concept for solving dictionary keywords
Ans. 
MapReduce is a programming model for processing large data sets in parallel.
• MapReduce divides the input data into chunks and processes them in parallel.

• It consists of two phases: Map and Reduce.

• Map function takes input data and converts it into key-value pairs.

• Reduce function takes the output of Map as input and combines the values with the same key.

• It is used for solving dictionary keywords by mapping each word to a k
Answered by AI
Add your answer