American Express Kotlin Developer Interview Questions and Answers

Q1. Project questions
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Q2. Spring related questions
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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
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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. Why do you want to switch
Ans. 
I want to switch to explore new technologies and challenges in a different industry.
• Interested in learning new skills and technologies

• Seeking new challenges and opportunities for growth

• Want to explore different industry perspectives
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Q2. Salry expectations
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Q1. Question on oop concepts
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Q2. Coding questions
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Asked about data structures

Asked about java programmes

Q1. Tell me about your self
Ans. 
I am a passionate software developer with 5 years of experience in developing web applications using Java, Spring, and Angular.
• 5 years of experience in software development

• Proficient in Java, Spring, and Angular

• Passionate about coding and problem-solving
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Q2. Are you ready to relocate
Ans. 
Yes, I am open to relocating for the right opportunity.
• I am willing to relocate for the right job opportunity that aligns with my career goals.

• I have experience moving for previous jobs and am comfortable with the process.

• I am excited about the possibility of exploring a new city or country and experiencing a different culture.
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East to medium level test covering basic aptitude topics and logical reasoning / pattern questions on AON

2 easy to medium level questions that can be solved in either python / cpp/ java

Q1. Technical interview was of 30 min. Complete focus is given to resume. But interview depends on interviewer. there were 18 panelists. Some were asked questions as easy as Prime no code. But I was asked to w...read more
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Q1. Java 8 features, functional Interfaces and predefined functional interfaces, Streams
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Q2. Collections, Aggregations, solid principles in Java
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Q3. Design patterns, singleton and factory explain in detail
Ans. 
Design patterns are reusable solutions to common problems in software design. Singleton ensures a class has only one instance, while factory creates objects without specifying the exact class.
• Design patterns are best practices for solving common software design problems.

• Singleton pattern ensures a class has only one instance and provides a global point of access to it.

• Factory pattern creates objects without specifying ...read more
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Q4. Spring functions, Spring Runners, Spring Exception handling
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Q5. Springboot annotations except common(any 5)
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Q6. Write spring boot program to accept json as request. write the logic and explain
Ans. 
Create a Spring Boot program to accept JSON requests and process the data.
• Create a Spring Boot application with a REST controller to handle incoming JSON requests.

• Use @PostMapping annotation to map the endpoint for accepting JSON requests.

• Use @RequestBody annotation to bind the incoming JSON data to a Java object.

• Process the JSON data as needed in the controller method.

• Return a response as JSON if required.
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Basic array questions and few technical mcqs

Q1. In depth drill down of java and oops basics
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Q1. Transaction management questions
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Q2. Internal working of arraylist and hashmap
Ans. 
ArrayList is a dynamic array implementation, while HashMap is a key-value pair data structure using hashing.
• ArrayList internally uses an array to store elements, and automatically resizes when needed.

• HashMap uses hashing to store key-value pairs, with keys being unique and values being accessible through the keys.

• ArrayList allows duplicate elements and maintains insertion order, while HashMap does not allow duplicate k...read more
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Q1. Why citi and what is your expected salary
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Round of 3 phases : Vocabulary, Business analytics and Coding

Q1. Convert number to ruman numeral
Ans. 
Convert a number to Roman numeral representation.
• Create a mapping of numbers to Roman numerals (e.g. 1 -> 'I', 5 -> 'V', 10 -> 'X', etc.)

• Iterate through the mapping in descending order and subtract the largest possible numeral from the number until it reaches 0.

• Build the Roman numeral representation by appending the corresponding numeral for each subtraction.

• Handle special cases like 4, 9, 40, 90, etc. by including the
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Q1. Resume questions
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