DE Shaw Software Engineer Intern Interview Questions and Answers

Q1. DSA Array, String and Hashmap questions
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Q2. Functional programming java questions
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Q1. Spring and spring boot related
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Q2. HLD scenario level questions
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Q3. SQL queries nested and joins
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Q4. DB related questions and experience level questions and previous project situations related questions
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Q5. Security level questions like XSS vulnerability and SQL injection
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Q1. Java springboot basic to intermediate question
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Q2. Java stream questions
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Q1. Easy level DSA questions
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Q2. Project based questions
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Q1. They asked first question related to Spring security .
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Q2. Questions related to rest API Given scenario and asked approach
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Q3. Database related like procedures call in db and also in springboot
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Q4. Core java related to collections
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Q1. In second round , interviewer asked me to write logic for Array sort
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Q2. Singleton class
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Q3. Design pattern like singleton and factory , dao
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Q4. Spring data JPA , jdbc connection
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Q5. Hibernate annotation
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Q1. Related to projects what we had done
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Q2. Difficult situations what u face
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Handling difficult situations by staying calm, analyzing the problem, and finding a solution.
• Remaining calm under pressure

• Identifying the root cause of the problem

• Collaborating with team members to brainstorm solutions

• Prioritizing tasks to address the issue efficiently
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Q3. Code standardization
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Portions covered:- maths, DBMS, OS, programming and verbal ability question

Q1. Explanation about projects in detail.
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Q2. Basics of SQL and DBMS
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Q1. How to debug in python
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Q2. For loop vs while loop. Full explanation, not only points
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1st round is aptitude and pesudocode

Q1. Mostly python questions
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Q2. List questions and basic to mediumprogram
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2 coding question for 60 mins. One array based question and one string based question.

Q1. Oops 2 pillars with examples ?
Ans. 
Oops 2 pillars are Abstraction and Encapsulation.
• Abstraction: Hiding unnecessary details and showing only relevant information. Example: Car dashboard displaying speed without showing internal engine details.

• Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: Class in object-oriented programming encapsulates data and methods.
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Q2. Inheritance and it's types with examples ?
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Inheritance is a concept in object-oriented programming where a class inherits properties and behaviors from another class.
• Types of inheritance: single inheritance, multiple inheritance, multilevel inheritance, hierarchical inheritance

• Single inheritance: a class inherits from only one parent class. Example: class Dog inherits from class Animal

• Multiple inheritance: a class inherits from multiple parent classes. Example:...read more
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Q1. What is the importance of manual testing when compared to automation testing
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Manual testing is important for exploratory testing, usability testing, and ad-hoc testing.
• Manual testing allows for exploratory testing where testers can explore the application and identify unexpected issues.

• Usability testing, which involves real users interacting with the software, is best done manually to capture user experience.

• Ad-hoc testing, where testers randomly test the application without predefined test cas...read more
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Q2. Real life scenario on web application testing
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Testing a web application for an online shopping platform
• Testing the functionality of adding items to the cart and checking out

• Testing the payment gateway integration for secure transactions

• Testing the search functionality to ensure accurate results are displayed

• Testing the responsiveness of the website on different devices and browsers
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Q1. What is the inheritance?
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Inheritance is a mechanism in object-oriented programming where a class inherits properties and behaviors from another class.
• Allows a class to inherit attributes and methods from another class

• Promotes code reusability and reduces redundancy

• Creates a parent-child relationship between classes

• Derived class can override or extend the functionality of the base class
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Q2. What are the types of joins in mysql
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Types of joins in MySQL include inner join, left join, right join, and full join.
• Inner join: Returns rows when there is a match in both tables.

• Left join: Returns all rows from the left table and the matched rows from the right table.

• Right join: Returns all rows from the right table and the matched rows from the left table.

• Full join: Returns rows when there is a match in one of the tables.
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Q1. How to handle multiple api's
Ans. 
Use a centralized API gateway to manage and route requests to multiple APIs efficiently.
• Implement a centralized API gateway to handle incoming requests and route them to the appropriate API based on the endpoint.

• Utilize API management tools like Apigee, Kong, or AWS API Gateway to manage and monitor multiple APIs.

• Consider implementing a caching layer to improve performance and reduce the number of requests to external
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Q2. What does strstr function do?
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strstr function searches for a substring within a string and returns a pointer to the first occurrence of the substring.
• Used in C programming language

• Syntax: char *strstr(const char *haystack, const char *needle)

• Example: char *str = strstr("hello world", "world")
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