Deloitte Interview Questions, Process, and Tips

Q1. What are the features of Java 8?
Ans. 
Java 8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods.
• Lambda expressions allow you to write code in a more concise and readable way. For example, (a, b) -> a + b.

• Functional interfaces are interfaces with a single abstract method, such as java.util.function.Function.

• Streams provide a way to work with collections of objects in a functional style. For e...read more
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Q2. What are generics in Java, and how do they provide benefits?
Ans. 
Generics in Java allow for type-safe collections and classes, providing compile-time type checking and reducing the need for casting.
• Generics enable the creation of classes, interfaces, and methods that operate on specified types.

• They provide compile-time type safety, preventing runtime errors due to type mismatches.

• Generics reduce the need for explicit type casting, making code more readable and maintainable.

• Example: ...read more
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Q3. Streams API coding questions.(3-4 question.)
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Q4. What are the classes involved from the entity to the controller level, and can you explain the annotations used in each?
Ans. 
Classes and annotations used from entity to controller level in a Java application.
• Entity classes represent database tables and are annotated with @Entity.

• Repository classes handle database operations and are annotated with @Repository.

• Service classes contain business logic and are annotated with @Service.

• Controller classes handle HTTP requests and are annotated with @Controller.
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Q5. SQL queries(2-3 questions).
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Q6. What is the usage of Spring Batch, and how did you implement it in your project? What are its key features?
Ans. 
Spring Batch is a lightweight, comprehensive batch framework designed for robust, scalable batch processing.
• Spring Batch is used for processing large volumes of data in batch jobs.

• It provides reusable functions for common batch processing scenarios such as reading, processing, and writing data.

• Spring Batch can be implemented to handle complex processing logic, error handling, and transaction management.

• Key features inc...read more
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Q7. What is the mechanism of how React works, specifically in relation to the Virtual DOM?(Some Additional questions on React - Theoretical)
Ans. 
React uses Virtual DOM to efficiently update the actual DOM by comparing the changes and only updating what is necessary.
• React creates a virtual representation of the actual DOM called Virtual DOM.

• When state or props change, React compares the Virtual DOM with the actual DOM to identify the differences.

• React then updates only the necessary parts of the actual DOM, minimizing the number of DOM manipulations.

• This process...read more
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Q1. Which design patterns are you familiar with?
Ans. 
I am familiar with design patterns such as Singleton, Factory, Observer, and Strategy.
• Singleton

• Factory

• Observer

• Strategy
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Q2. Which design patterns have you used, and how have you implemented them? Please explain.
Ans. 
I have used design patterns such as Singleton, Factory, and Observer in my projects.
• Implemented Singleton pattern to ensure only one instance of a class exists

• Utilized Factory pattern to create objects without specifying the exact class

• Applied Observer pattern to establish a one-to-many dependency between objects
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Q3. What are threads in the context of programming?
Ans. 
Threads in programming are lightweight processes that can run concurrently within a program.
• Threads allow for parallel execution of tasks within a program

• Threads share the same memory space, allowing for efficient communication and data sharing

• Examples of using threads include multi-threaded web servers and parallel processing in data analysis
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Q4. Benefits of Spring Boot over Spring?
Ans. 
Spring Boot simplifies Spring application development by providing out-of-the-box features and reducing configuration.
• Spring Boot reduces boilerplate code by providing default configurations for various components like embedded servers, logging, and security.

• Spring Boot allows for easier deployment by packaging applications as standalone JAR files with embedded containers.

• Spring Boot provides a range of starter depende...read more
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Q1. It was basic salary and expectation discussion.
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It was medium and if you focus you should be able to complete that!

Q1. Heat map and tree map difference and what you did so far in Tableau!
Ans. 
Heat maps display data in colors on a grid, while tree maps show hierarchical data using nested rectangles.
• Heat maps use colors to represent data values on a grid, while tree maps use nested rectangles to display hierarchical data.

• In Tableau, I have created heat maps to visualize sales data across different regions, and tree maps to show the sales distribution by product categories.

• Heat maps are useful for identifying ...read more
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Q2. Tool tips use. Types of graph which can help in KPIs
Ans. 
Different types of graphs like bar charts, line graphs, and pie charts can help in visualizing KPIs effectively.
• Bar charts can be used to compare KPIs across different categories or time periods.

• Line graphs are useful for showing trends and changes in KPIs over time.

• Pie charts can display the proportion of each KPI relative to the total.

• Combination charts can be used to show multiple KPIs in a single graph for comparis
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Q1. Cultural fit question and scenario questions.
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In the aptitude round there were various sections such as quants, verbal and technical questions based on networking and cloud platforms and some pseudo codes . No coding questions were asked .

It was structured group discussion with one panel member and a case study was provided to us .

Q1. Tell me about yourself .
Ans. 
I am a dedicated and detail-oriented analyst with a strong background in data analysis and problem-solving.
• I have a Bachelor's degree in Statistics and have completed multiple data analysis projects during my studies.

• I am proficient in using statistical software such as R and Python to analyze data and generate insights.

• I have experience working with cross-functional teams to develop and implement data-driven strategie...read more
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Q2. Tell me about the projects that you have made .
Ans. 
I have worked on various projects including financial analysis, market research, and data visualization.
• Developed financial models to analyze company performance

• Conducted market research to identify growth opportunities

• Created interactive dashboards for data visualization

• Collaborated with cross-functional teams to implement project recommendations
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Q3. Puzzles questions
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Q4. Coding question
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Q5. Machine learning question
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Simple quat questions

Q1. Which language you are comfortable in and write code for any sorting algorithm you know
Ans. 
I am comfortable in Java and can write code for sorting algorithms like Bubble Sort, Selection Sort, and Merge Sort.
• I am proficient in Java and have experience writing code for sorting algorithms.

• I can implement popular sorting algorithms like Bubble Sort, Selection Sort, and Merge Sort.

• I have a strong understanding of algorithm complexity and efficiency.

• I can provide examples of code for sorting algorithms upon reques
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Q2. What is oops
Ans. 
OOPs stands for Object-Oriented Programming. It is a programming paradigm based on the concept of objects, which can contain data in the form of fields and code in the form of procedures.
• OOPs focuses on creating objects that interact with each other to solve a problem

• It involves concepts like inheritance, encapsulation, polymorphism, and abstraction

• Examples of OOPs languages include Java, C++, and Python
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1. Print the duplicate characters from a string. 2. Take two character arrays and check whether character array 2 is a subarray of character array 1.

Q1. Questions on REST APIs, multi threading etc
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Q2. Questions on Maven, excel handling code, JSON parsing etc
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Q1. Topics asked Advanced SQL spark dataproc Bigquery Qliksense Git Hub Any innovations or process optimised or not Google Cloud
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Q1. Bigquery spark hadoop hive questions asked on above topics Why are you changing? what extra can you bring with you? whats motivating you to join Deloitte?
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