Wells Fargo Senior Software Engineer Interview Questions, Process, and Tips for Experienced

Q1. Explain how spring boot application startup works in detail
Ans. 
Spring Boot application startup involves auto-configuration, component scanning, and dependency injection.
• Spring Boot uses embedded Tomcat, Jetty, or Undertow server for running the application.

• Auto-configuration automatically configures the application based on dependencies and properties.

• Component scanning scans the project for components like controllers, services, and repositories.

• Dependency injection injects depen...read more
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Q2. When using java streams API, will the performance get impacted?
Ans. 
Using Java streams API may impact performance depending on how it is implemented.
• Performance impact can vary based on the size of the data being processed.

• Improper use of streams can lead to unnecessary overhead and decreased performance.

• Parallel streams can improve performance for large datasets by utilizing multiple threads.

• Careful consideration of stream operations and data size is important for optimizing performan
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Q1. How to configure 2 data base in spring boot
Ans. 
To configure 2 databases in Spring Boot, you can use multiple DataSource beans and specify them in application.properties.
• Define multiple DataSource beans in your configuration class

• Use @Primary annotation to specify the primary DataSource

• Use @Qualifier annotation to specify the secondary DataSource

• Configure the properties for each DataSource in application.properties
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Q2. Concurrent hashmap use case
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Concurrent hashmap is used for thread-safe operations in a multi-threaded environment.
• Concurrent hashmap allows multiple threads to read and write to the map concurrently without causing data corruption.

• It is useful in scenarios where multiple threads need to access and update a shared hashmap.

• Example: Implementing a cache system where multiple threads can read and write data concurrently.
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Hacker rank coding interview

Hacker rank coding interview

Q1. Angular and c sharp technical questions
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Q1. Questions about working experience
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Q1. Salary discussions
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Hackerrank test was there and difficult level

Q1. What is react hooks
Ans. 
React Hooks are functions that let you use state and other React features without writing a class.
• React Hooks were introduced in React 16.8 to allow functional components to have state and lifecycle methods.

• They allow you to reuse stateful logic across multiple components without changing the component hierarchy.

• Some commonly used React Hooks are useState, useEffect, useContext, and useReducer.

• Example: useState hook al...read more
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Q2. What us virtual dom
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Virtual DOM is a lightweight copy of the actual DOM used for efficient updates in web development.
• Virtual DOM is a concept used in frameworks like React to improve performance by minimizing actual DOM updates.

• Changes are first made to the virtual DOM, then compared with the actual DOM to only update what has changed.

• This process helps reduce the number of manipulations needed on the real DOM, leading to faster renderin
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Q3. React js vs Angular
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React js is a lightweight library for building user interfaces, while Angular is a full-fledged framework with more features and complexity.
• React is more flexible and allows for easier integration with other libraries and frameworks.

• Angular provides more out-of-the-box features like routing, forms handling, and dependency injection.

• React is easier to learn and has a larger community support.

• Angular has a steeper learni...read more
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Q4. Component life cycle methods
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Q5. Functional vs class components
Ans. 
Functional components are simpler, stateless, and use hooks. Class components have lifecycle methods and state management.
• Functional components are simpler and easier to read/write.

• Class components have lifecycle methods like componentDidMount, componentDidUpdate, etc.

• Functional components use hooks for state management and side effects.

• Class components use this keyword for accessing props and state.

• Example: Functional...read more
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Q1. Performance Related Questions and Basic Questions on Dot Net Core
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Q2. Authentication and Authorization in .Net core
Ans. 
Authentication and Authorization in .Net core
• Authentication verifies the identity of a user while Authorization checks if the user has access to a resource

• .Net core provides built-in authentication and authorization middleware

• Authentication can be done using various methods like JWT, OAuth, Cookies, etc.

• Authorization can be done using policies, roles, claims, etc.
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Q1. Mainly Focussed on Problem Solving and Designing Solutions
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Q2. Basic SQL Questions like functions, stored procedures, indexes
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Q1. Difference between spring mvc and spring boot
Ans. 
Spring MVC is a web framework for building web applications, while Spring Boot is an opinionated way to create Spring applications.
• Spring MVC is a part of the larger Spring Framework, providing a model-view-controller architecture for web applications.

• Spring Boot is a standalone application that simplifies the Spring application development process by providing defaults for configuration.

• Spring Boot includes embedded s...read more
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Q2. How to do multiple db congratulations in spring boot
Ans. 
Use Spring Boot's @Transactional annotation to handle multiple database transactions
• Use @Transactional annotation on service methods to handle transactions across multiple databases

• Configure multiple DataSource beans in your Spring Boot application

• Use @Qualifier annotation to specify which DataSource to use in each transaction
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Q1. What is ConcurrentModificationException in Java
Ans. 
ConcurrentModificationException is a runtime exception thrown by Java when an object is modified concurrently while iterating over it.
• Occurs when a collection is modified while being iterated over using an iterator

• Can be avoided by using ConcurrentHashMap or CopyOnWriteArrayList

• Example: List<String> list = new ArrayList<>(); Iterator<String> iterator = list.iterator(); list.add("example");
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Q2. SOLID design principles
Ans. 
SOLID design principles are a set of five principles to help developers create more maintainable and scalable software.
• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open/Closed Principle: Classes should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Objects of a superclass should be replaceable with objects of its subclasses without affectin...read more
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