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Citicorp Senior Software Engineer Interview Questions and Answers
10 Interview questions
Utilize multithreading to enhance performance and responsiveness in OTP authentication systems.
Use separate threads for generating and sending OTPs to avoid blocking the main thread.
Implement a thread pool to manage multiple OTP requests efficiently.
Utilize asynchronous programming to handle user verification while sending OTPs.
Example: Use a thread to send an OTP via SMS while another thread waits for user input.
...
The equals method and hashCode must maintain a consistent contract for object equality in Java.
If two objects are equal according to equals(), their hashCode() must return the same integer.
If two objects are not equal according to equals(), their hashCode() can return the same or different integers.
Example: If 'a.equals(b)' is true, then 'a.hashCode()' must equal 'b.hashCode()'.
Failing to adhere to this contract c...
For a warehouse application, collections like lists, maps, and sets are essential for efficient restocking operations.
Use Lists for ordered inventory items, e.g., ArrayList in Java for easy access and iteration.
Utilize Maps for quick lookups, e.g., HashMap to associate item IDs with their quantities.
Implement Sets to manage unique items, e.g., HashSet to avoid duplicates during restocking.
Query to find the student with the highest score in a specific subject from three related tables.
Use SQL JOIN to combine Student, Subject, and Scores tables.
Filter results using a WHERE clause to specify the subject.
Use ORDER BY to sort scores in descending order.
Limit the result to 1 to get the topper.
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Use two-pointer approach to move all zeros to the beginning of the array.
Initialize two pointers, one at the beginning and one at the end of the array.
Swap elements at the two pointers if the element at the beginning pointer is zero.
Move the pointers towards each other until they meet.
HashMap is faster than TreeMap wrto performance due to its constant time complexity for most operations.
HashMap has O(1) time complexity for most operations while TreeMap has O(log n) time complexity.
HashMap is implemented using an array of buckets while TreeMap is implemented using a Red-Black Tree.
HashMap is preferred for frequent read operations while TreeMap is preferred for frequent write operations.
HashMap i...
Yes, multiple exceptions can be caught in a single catch block separated by commas.
Multiple exceptions can be caught in a single catch block separated by commas.
This can be useful when handling different types of exceptions in a similar way.
For example: catch (IOException | SQLException ex) { // handle exception }
Yes, it is possible to write a try catch block inside a catch block.
This is called nested try-catch block.
It is useful when we want to handle different types of exceptions in different ways.
Example: try { //code } catch (ExceptionType1 e1) { try { //code } catch (ExceptionType2 e2) { //code } } }
It is important to avoid excessive nesting as it can make the code difficult to read and maintain.
Spring Boot provides a robust exception handling mechanism using @ControllerAdvice and @ExceptionHandler annotations.
Use @ControllerAdvice to handle exceptions globally across all controllers.
Define custom exception classes for specific error scenarios, e.g., ResourceNotFoundException.
Use @ExceptionHandler to specify methods that handle specific exceptions.
Return a ResponseEntity with appropriate HTTP status codes...
REST API methods are used to interact with web services using HTTP requests.
GET method is used to retrieve data from the server
POST method is used to create new data on the server
PUT method is used to update existing data on the server
DELETE method is used to delete data from the server
REST APIs use HTTP status codes to indicate the success or failure of a request
Citicorp Senior Software Engineer Interview Experiences
10 interviews found
Anonymous
I appeared for an interview in Mar 2025, where I was asked the following questions.
- Q1. Contract between equals method and hashcode
- Ans.
The equals method and hashCode must maintain a consistent contract for object equality in Java.
If two objects are equal according to equals(), their hashCode() must return the same integer.
If two objects are not equal according to equals(), their hashCode() can return the same or different integers.
Example: If 'a.equals(b)' is true, then 'a.hashCode()' must equal 'b.hashCode()'.
Failing to adhere to this contract can le...
- Q2. What collections would you use for a warehouse application? specifically restocking operation?
- Ans.
For a warehouse application, collections like lists, maps, and sets are essential for efficient restocking operations.
Use Lists for ordered inventory items, e.g., ArrayList in Java for easy access and iteration.
Utilize Maps for quick lookups, e.g., HashMap to associate item IDs with their quantities.
Implement Sets to manage unique items, e.g., HashSet to avoid duplicates during restocking.
- Q3. 3 tables - Student,subject,scores. Query to find topper in a specific subject.
- Ans.
Query to find the student with the highest score in a specific subject from three related tables.
Use SQL JOIN to combine Student, Subject, and Scores tables.
Filter results using a WHERE clause to specify the subject.
Use ORDER BY to sort scores in descending order.
Limit the result to 1 to get the topper.
- Q4. How to use multithreading for a OTP based authentication system
- Ans.
Utilize multithreading to enhance performance and responsiveness in OTP authentication systems.
Use separate threads for generating and sending OTPs to avoid blocking the main thread.
Implement a thread pool to manage multiple OTP requests efficiently.
Utilize asynchronous programming to handle user verification while sending OTPs.
Example: Use a thread to send an OTP via SMS while another thread waits for user input.
Ensur...
Interview Preparation Tips
preeti gupta
I applied via Approached by Company
Mostly they asked questions on String or basic coding questions
(1 Question)
- Q1. Core java questions basics, SpringBoot Microservice ,Sql questions
(1 Question)
- Q1. Mostly questions on core java, day to day activities , agile,beghavioural questions
(1 Question)
- Q1. Salary Expectation
Interview Preparation Tips
(2 Questions)
- Q1. Java related questions were asked
- Q2. Mongo related we're asked
(1 Question)
- Q1. Put all the zero at the top of the array
- Ans.
Use two-pointer approach to move all zeros to the beginning of the array.
Initialize two pointers, one at the beginning and one at the end of the array.
Swap elements at the two pointers if the element at the beginning pointer is zero.
Move the pointers towards each other until they meet.
Skills evaluated in this interview
Ruchit Motiwala
Data structure and Algorithm
(1 Question)
- Q1. All Java basic questions
(1 Question)
- Q1. Microservices , database
Selected
I applied via Naukri.com and was interviewed in Jul 2022. There were 4 interview rounds.
(1 Question)
- Q1. Full Java deep knowledge including oops concepts then rest APIs then have some basic knowledge of microservices then spring boot all the things have mastery
(4 Questions)
- Q1. What is fast wrto performance?hashmap or treemap and why
- Ans.
HashMap is faster than TreeMap wrto performance due to its constant time complexity for most operations.
HashMap has O(1) time complexity for most operations while TreeMap has O(log n) time complexity.
HashMap is implemented using an array of buckets while TreeMap is implemented using a Red-Black Tree.
HashMap is preferred for frequent read operations while TreeMap is preferred for frequent write operations.
HashMap is uno...
- Q2. Can I write a try catch block inside a catch Block
- Ans.
Yes, it is possible to write a try catch block inside a catch block.
This is called nested try-catch block.
It is useful when we want to handle different types of exceptions in different ways.
Example: try { //code } catch (ExceptionType1 e1) { try { //code } catch (ExceptionType2 e2) { //code } } }
It is important to avoid excessive nesting as it can make the code difficult to read and maintain.
- Q3. Are exceptions can be written in a catch block seperated by commas,?
- Ans.
Yes, multiple exceptions can be caught in a single catch block separated by commas.
Multiple exceptions can be caught in a single catch block separated by commas.
This can be useful when handling different types of exceptions in a similar way.
For example: catch (IOException | SQLException ex) { // handle exception }
- Q4. Hashmap internal working
(1 Question)
- Q1. Why this and what all offers you are having It was a normal telephone call
Interview Preparation Tips
Skills evaluated in this interview
Selected
I appeared for an interview before May 2024, where I was asked the following questions.
- Q1. Design social media like app
- Ans.
Design a social media app with user profiles, posts, interactions, and privacy features.
User Profiles: Allow users to create profiles with photos, bios, and interests.
Posts: Enable users to share text, images, and videos, similar to platforms like Instagram or Twitter.
Interactions: Implement likes, comments, and shares to foster engagement.
News Feed: Create an algorithm to display posts based on user preferences and in...
- Q2. Solid principle
I applied via Recruitment Consulltant and was interviewed in Feb 2022. There were 3 interview rounds.
(1 Question)
- Q1. Questions on Core and advance Java like Collections, Java8, streams, Multithreading, Spring Boot concepts like annotations, security, codes and Microservices, Agile.
(1 Question)
- Q1. Technical + Managerial Round Technical questions on Java Spring Boot and Microservices. Managerial round questions as well.
(5 Questions)
- Q1. Tell me about yourself.
- Q2. Why are you looking for a change?
- Q3. What are your salary expectations?
- Q4. Share details of your previous job.
- Q5. This was also the salary discuss round.
Interview Preparation Tips
- Java
- Core Java
- Microservices
- Spring Boot
- Agile
Selected
I applied via Naukri.com and was interviewed before Mar 2023. There was 1 interview round.
(2 Questions)
- Q1. C# interview Questions
- Q2. Delegates based questions
I applied via Naukri.com and was interviewed in Nov 2021. There was 1 interview round.
Interview Questionnaire
3 Questions
- Q1. Java 8 functional interface, lambdas etc
- Q2. Spring boot exception handling mechanism
- Ans.
Spring Boot provides a robust exception handling mechanism using @ControllerAdvice and @ExceptionHandler annotations.
Use @ControllerAdvice to handle exceptions globally across all controllers.
Define custom exception classes for specific error scenarios, e.g., ResourceNotFoundException.
Use @ExceptionHandler to specify methods that handle specific exceptions.
Return a ResponseEntity with appropriate HTTP status codes and ...
- Q3. Rest api methods and working
- Ans.
REST API methods are used to interact with web services using HTTP requests.
GET method is used to retrieve data from the server
POST method is used to create new data on the server
PUT method is used to update existing data on the server
DELETE method is used to delete data from the server
REST APIs use HTTP status codes to indicate the success or failure of a request
Interview Preparation Tips
Skills evaluated in this interview
Citicorp Interview FAQs
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Overall Interview Experience Rating
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Citicorp Senior Software Engineer Reviews and Ratings
based on 39 reviews
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