HashedIn by Deloitte Data Engineer Interview Questions and Answers

Precompilation unit is a compiled code that can be reused by multiple source files.

• Precompilation unit is created by the compiler from the source code.

• It contains the compiled code of header files and other dependencies.

• It can be reused by multiple source files, reducing compilation time.

• It is also known as precompiled header or PCH.

• Example: stdafx.h in Visual Studio is a precompiled header file.

The first 50 prime numbers are...

• Start with 2, the first prime number

• Check each odd number greater than 2

• Use trial division to check if a number is prime

• Stop when you have found 50 prime numbers

Sorting a file within a range

• Use a sorting algorithm like quicksort or mergesort

• Read the file and store the data in an array or list

• Sort the array or list within the given range

• Write the sorted data back to the file

I am a passionate software engineer with experience in developing web applications using various technologies.

• Experienced in developing web applications using HTML, CSS, JavaScript, and frameworks like React and Angular

• Proficient in backend development with Node.js, Express, and MongoDB

• Familiar with version control systems like Git and project management tools like Jira

I am a passionate software engineer with experience in developing web applications and a strong background in computer science.

• Experienced in developing web applications using technologies such as HTML, CSS, JavaScript, and React

• Strong background in computer science with knowledge in algorithms and data structures

• Passionate about learning new technologies and solving complex problems

I have worked on various projects including a web application for inventory management and a mobile app for fitness tracking.

• Developed a web application using React for inventory management

• Created a mobile app using Flutter for fitness tracking

• Implemented RESTful APIs for communication between frontend and backend systems

My area of interest is artificial intelligence and machine learning.

• I have experience in developing machine learning models for predictive analytics.

• I am interested in natural language processing and computer vision applications.

• I enjoy exploring deep learning algorithms and neural networks.

• I have worked on projects involving recommendation systems and image recognition.

C++ is a high-level programming language with features like object-oriented programming, templates, and memory management.

• C++ supports object-oriented programming concepts like encapsulation, inheritance, and polymorphism.

• Templates allow generic programming and code reusability.

• C++ provides low-level memory manipulation through pointers.

• Standard Template Library (STL) provides a collection of classes and functions for ...read more

Big Data refers to large and complex data sets that cannot be processed using traditional data processing methods.

• Big Data is characterized by the 3Vs - Volume, Velocity, and Variety.

• It requires specialized tools and technologies such as Hadoop, Spark, and NoSQL databases.

• Examples of Big Data include social media data, sensor data, and financial market data.

Program to reverse a string without using string function

• Iterate through the string from end to start and append each character to a new string

• Use a loop to swap the first and last characters, then move towards the middle until the entire string is reversed

• Convert the string to a character array, then swap the first and last elements until the entire array is reversed

I was responsible for designing and implementing the project's database and backend functionality.

• Designed the database schema and created the necessary tables

• Implemented the backend functionality using Java and Spring framework

• Collaborated with team members to integrate the frontend and backend components

• Tested the application and fixed any bugs or issues that arose

• Presented the project to the faculty and received pos

Keys in a database are unique identifiers used to establish relationships between tables and ensure data integrity.

• Keys are used to uniquely identify records in a database table.

• Primary keys are used to uniquely identify each record in a table.

• Foreign keys establish relationships between tables.

• Keys help enforce data integrity and maintain consistency in the database.

• Examples of keys include primary keys, foreign keys,

Issues in cloud include security, downtime, vendor lock-in, and data privacy.

• Security concerns such as data breaches and unauthorized access

• Downtime and service interruptions affecting business operations

• Vendor lock-in and limited flexibility in choosing cloud providers

• Data privacy and compliance with regulations such as GDPR and HIPAA

Developed a web application for online shopping using React and Node.js

• Implemented user authentication and authorization using JSON Web Tokens (JWT)

• Used MongoDB as the database to store user and product information

• Implemented a search feature using Elasticsearch to provide fast and accurate search results

• Integrated Stripe payment gateway for secure online transactions

The flow diagram of my final year project showcases the step-by-step process of its execution.

• The flow diagram illustrates the sequence of activities and their dependencies.

• It helps in understanding the overall structure and logic of the project.

• Each step in the diagram represents a specific task or action.

• Arrows indicate the flow of control or data between different steps.

• Decision points are represented by diamond-sha...read more

Normalisation reduces data redundancy and improves data integrity in a database.

• Prevents data duplication and inconsistencies

• Simplifies database maintenance and updates

• Improves query performance

• Enforces data integrity and consistency

• Follows best practices for database design

• Examples: breaking down a customer table into separate tables for orders, addresses, and payments

• Examples: creating a separate table for product ca...read more

I am a passionate software engineer with experience in developing web applications and a strong background in computer science.

• Experienced in developing web applications using technologies like HTML, CSS, JavaScript, and React

• Strong background in computer science with knowledge of algorithms and data structures

• Familiar with agile development methodologies and version control systems like Git

I am a problem solver, team player, quick learner, detail-oriented, and have strong communication skills.

• Problem solver - I enjoy tackling complex problems and finding innovative solutions.

• Team player - I work well with others and value collaboration in achieving goals.

• Quick learner - I am able to pick up new technologies and concepts quickly.

• Detail-oriented - I pay attention to the smallest details to ensure high-qual...read more

Yes, I have a Bachelor's degree in Computer Engineering.

• Bachelor's degree in Computer Engineering

• Experience in software development

• Knowledge of engineering principles applied to software design

My day was productive and challenging, with a lot of problem-solving and collaboration.

• Completed a major coding project ahead of schedule

• Participated in a brainstorming session with team members

• Solved a tricky bug in the codebase

• Attended a virtual meeting with stakeholders

No, I do not have any relatives in Pune. I have arranged for my accommodation in a rented apartment near the office.

• No relatives in Pune

• Accommodation arranged in a rented apartment near the office

Yes, My Passion Challenge test is a coding competition for software engineers.

• My Passion Challenge test is a coding competition that evaluates the coding skills of software engineers.

• It is designed to test problem-solving abilities, algorithmic thinking, and coding proficiency.

• Participants are given a set of coding challenges to solve within a specified time limit.

• The challenges can range from simple to complex, coveri...read more

Considering pursuing a Master's degree in Computer Science to deepen knowledge and advance career.

• Considering pursuing a Master's degree in Computer Science

• To deepen knowledge and advance career

• Examples: MS in Computer Science at XYZ University, online courses in AI and Machine Learning

Yes, I can remove all the pcs from the lab and keep them in another lab right now.

• Ensure all the necessary equipment and tools are available for the move

• Coordinate with the lab staff to ensure a smooth transition

• Label and document each PC for easy identification and setup in the new lab

• Ensure proper packaging and handling to prevent any damage during the move

Fibonacci series is a sequence of numbers where each number is the sum of the two preceding ones.

• The first two numbers of the series are always 0 and 1

• The next number is the sum of the previous two numbers

• The series goes on infinitely: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, ...

• Pseudo code: 1. Initialize variables a=0, b=1, c=0 2. Print a and b 3. Repeat steps 4-6 until desired number of terms 4. c=a+b 5. Pr

Algorithm for matrix multiplication

• Create a result matrix with dimensions of the two input matrices

• Iterate through each row and column of the result matrix

• For each element in the result matrix, multiply corresponding row in first matrix with corresponding column in second matrix

• Add the products obtained in the previous step to get the final value for the element

I worked on a project that involved sentiment analysis of customer reviews using Naive Bayes algorithm.

• The project involved collecting customer reviews from various sources.

• Preprocessing the data by removing stop words, stemming, and tokenizing.

• Used Naive Bayes algorithm for sentiment analysis.

• The algorithm was chosen because of its simplicity and effectiveness in text classification tasks.

• The accuracy of the model was