BT Group Software Developer Interview Questions and Answers

Aptitude, core concepts and a code

Q1. What is the one thing you learnt from college club?
Ans. 
I learned the importance of teamwork and collaboration from my college club.
• Developed strong communication skills by working with diverse group of individuals

• Learned how to delegate tasks effectively to achieve common goals

• Gained experience in problem-solving and conflict resolution through group projects
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Q2. What is the one thing you want to expereince?
Ans. 
I want to experience living in a different country and immersing myself in a new culture.
• Traveling to a foreign country and learning about their customs and traditions

• Trying new foods and experiencing different ways of life

• Making friends with locals and exploring the local attractions
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Q1. Difference between relational and non relational dbms
Ans. 
Relational DBMS stores data in tables with predefined relationships, while non-relational DBMS stores data in flexible, schema-less formats.
• Relational DBMS uses structured query language (SQL) for querying data

• Non-relational DBMS can store data in various formats like key-value pairs, document-based, graph databases

• Relational DBMS ensures data integrity through normalization and constraints

• Non-relational DBMS offers be...read more
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Q2. Difference betweeen class,abstract class,interface in python
Ans. 
Class is a blueprint for creating objects, abstract class cannot be instantiated and can have abstract methods, interface is a contract for classes to implement certain methods.
• Class is a blueprint for creating objects with attributes and methods.

• Abstract class cannot be instantiated and can have abstract methods that must be implemented by subclasses.

• Interface is a contract for classes to implement certain methods, bu
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Q3. Project related questions were asked
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Q1. They grind u in javascript,typescript
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Q2. Html css, angular
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Q3. Deep preparation needed
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It was an online assessment containing 3 DSA questions

Q1. Medium level array questions
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Q2. Medium level DP questions
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Q1. General behavioural question about
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DP graphs strings it was good

Q1. Reverse a linkded list
Ans. 
Reverse a linked list by changing the direction of pointers
• Start with three pointers: current, previous, and next

• Iterate through the list, updating pointers to reverse the direction

• Return the new head of the reversed list
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Q2. Print fibonacci series
Ans. 
The Fibonacci series is a sequence of numbers where each number is the sum of the two preceding ones.
• Start with two variables initialized to 0 and 1

• Loop through desired number of iterations, adding the previous two numbers to get the next number

• Print or store each number in the series
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Q1. What is method overloading and overriding
Ans. 
Method overloading is when multiple methods have the same name but different parameters. Method overriding is when a subclass provides a specific implementation of a method that is already provided by its superclass.
• Method overloading allows a class to have multiple methods with the same name but different parameters.

• Method overriding occurs in a subclass when a method has the same name, return type, and parameters as ...read more
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Q2. Program to swap two variables without using third
Ans. 
Swapping two variables without using a third variable
• Use XOR operation to swap two variables without using a third variable

• Example: a = 5, b = 10; a = a ^ b; b = a ^ b; a = a ^ b; // Now a = 10, b = 5
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Q1. Why you want to join this organization
Ans. 
I am impressed by the organization's innovative projects and collaborative work culture.
• Impressed by innovative projects

• Attracted to collaborative work culture

• Excited about potential for growth and learning opportunities
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Q2. What is your weakness and strength
Ans. 
My weakness is overthinking and my strength is attention to detail.
• Weakness: tend to overthink situations, which can lead to indecision or unnecessary stress

• Strength: strong attention to detail, ensuring accuracy and quality in my work

• Example: I sometimes spend too much time analyzing a problem before taking action, but I have learned to set deadlines for myself to prevent this from affecting my productivity
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Q1. Oops concept related work
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Q2. Technology used in prj
Ans. 
Various technologies used in the project include Java, Spring Boot, Angular, MySQL, and Docker.
• Java

• Spring Boot

• Angular

• MySQL

• Docker
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Q1. String litteral,
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Q2. Collection hierarchy
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