BT Group Senior Software Engineer Interview Questions and Answers

Test was for Web Development - React
75min test
3 Questions
1 Coding Question
2 Scenario based questions

Q1. React Optimization techniques
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Q2. React Advantages
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Q1. How to debug in production environment?
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Q1. Challenges faced during work and how you overcome?
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Q1. Why you choose Wells fargo over other offers?
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String manipulation questions easy not that much hard

Q1. String manipulation
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Q2. Reverse a string according to it's input
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Q1. C questions on oops concepts
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Q2. Python and ml questions
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Q1. Salary discussion
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Q1. Find nth elements from last in linked list
Ans. 
Use two pointers to find the nth element from the end of a linked list.
• Use two pointers, one moving n steps ahead of the other

• When the first pointer reaches the end, the second pointer will be at the nth element from the end
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Q2. Difference between hashmap and concurrent hashmap
Ans. 
HashMap is not thread-safe while ConcurrentHashMap is thread-safe and allows concurrent access.
• HashMap is not thread-safe and can lead to ConcurrentModificationException if accessed by multiple threads simultaneously.

• ConcurrentHashMap allows concurrent access by multiple threads without the need for external synchronization.

• ConcurrentHashMap achieves thread-safety by dividing the map into segments, allowing multiple th...read more
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Q1. Struts framework question
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Q2. Working flow of struts
Ans. 
Struts is a framework for building Java web applications based on the Model-View-Controller (MVC) design pattern.
• Struts framework is based on MVC architecture

• It uses ActionServlet as the controller

• Struts configuration is done using XML files like struts-config.xml

• It provides built-in support for form validation and error handling

• Struts actions are mapped to URLs in struts-config.xml
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Q1. Java 8, Stream API
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Q2. Dependency Injection in Spring
Ans. 
Dependency Injection in Spring is a design pattern where objects are passed their dependencies rather than creating them internally.
• In Spring, dependencies are injected into a class through constructor injection, setter injection, or field injection.

• This helps in achieving loose coupling between classes and makes the code more testable and maintainable.

• Example: @Autowired annotation in Spring is used for dependency inj
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Q1. My Experience in IT
Ans. 
I have over 8 years of experience in IT, specializing in software development and project management.
• Developed web applications using Java, Spring, and AngularJS

• Led a team of developers in implementing a new CRM system for a large client

• Managed multiple projects simultaneously, ensuring on-time delivery and client satisfaction
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