Deutsche Bank Software Engineer Trainee Interview Questions and Answers

Q1. Spring Boot Related Questions
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Q2. Authentication handling in microservices
Ans. 
Authentication handling in microservices involves securing communication between services and managing user access.
• Implement token-based authentication for secure communication between microservices

• Use OAuth or JWT for authentication and authorization

• Centralize authentication logic in a separate service to avoid duplication

• Implement role-based access control to manage user permissions
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Q3. Microservice design patterns
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Q4. Java 8 map function
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The map function in Java 8 is used to transform each element of a stream using a given function.
• Map function is a method in the Stream interface that applies a function to each element in the stream and returns a new stream with the transformed elements.

• It is commonly used for converting or manipulating data in a stream without modifying the original data source.

• Example: List numbers = Arrays.asList(1, 2, 3, 4, 5); Lis...read more
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Mcq+coding which are medium level questions

Q1. Multiple inheritance allowed in java?
Ans. 
No, multiple inheritance is not allowed in Java.
• Java does not support multiple inheritance for classes to avoid the diamond problem.

• However, multiple inheritance is allowed for interfaces in Java.

• Example: class A extends B, C is not allowed, but interface X extends Y, Z is allowed.
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Q2. Diff btw static and final
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Static is used to define class-level variables and methods, while final is used to define constants and prevent inheritance or modification.
• Static variables and methods belong to the class itself, while final variables cannot be changed once initialized.

• Static members can be accessed without creating an instance of the class, while final members must be accessed through an instance.

• Static variables are shared among all...read more
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Q3. What is data encapsulation?
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Data encapsulation is the concept of bundling data and methods that operate on the data into a single unit, known as a class.
• Encapsulation hides the internal state of an object and only exposes the necessary functionalities through methods.

• It helps in achieving data abstraction and information hiding.

• Example: A class 'Car' encapsulates data like speed, color, and methods like accelerate() and brake().
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Q1. Tell me about yourself
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I am a passionate software developer with experience in Java, Python, and web development.
• Experienced in Java, Python, and web development technologies

• Strong problem-solving skills

• Team player with excellent communication skills
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Q2. What are company core values
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Company core values are the fundamental beliefs that guide the behavior and decisions of employees.
• Integrity - acting with honesty and transparency in all dealings

• Innovation - constantly seeking new and better ways to solve problems

• Customer focus - prioritizing the needs and satisfaction of customers

• Teamwork - collaborating effectively with colleagues to achieve common goals
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Q1. Asked about oops
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Q2. Easy level DSA question was asked
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Q1. General hr questions
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Q1. Java Stream coding questions
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Q2. Java Collections
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Q3. Spring Boot Annotations
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Q4. Sql Queries highest 3 salary employee name
Ans. 
Use SQL query to retrieve the names of the top 3 employees with the highest salary.
• Use the ORDER BY clause to sort the salaries in descending order.

• Use the LIMIT clause to limit the results to the top 3.

• Join the employee table with the salary table to retrieve employee names.
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Q1. Explain event driven architecture of node.js
Ans. 
Node.js uses event-driven architecture where events trigger callbacks to handle asynchronous operations.
• Node.js uses event loop to handle asynchronous operations efficiently

• Events are emitted by various objects in Node.js like HTTP servers, file system, etc.

• Callbacks are registered to handle events and execute code when events occur
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Core java , string, thread , sql, mvc, spring boot

Q1. 2 coding questions on array and string
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Q2. Sorting , thread
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Q1. Managerial round
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Q2. Project and some basic questions
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Q3. Describe your project
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Behavioural and culture fit

60 min of Aptitude test

30 min Coding test 2 que

Q1. Basic dbms que , os
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