Citicorp Senior Java Developer Interview Questions, Process, and Tips

Q1. How is transaction managed in microservices architecture?
Ans. 
Transactions in microservices are managed using distributed transactions or compensating transactions.
• Distributed transactions involve multiple microservices coordinating with a transaction manager to ensure data consistency across services.

• Compensating transactions involve each microservice having a compensating action to rollback changes if a transaction fails.

• Saga pattern is commonly used in microservices to manage ...read more
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Q2. Questions about java garbage collection
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Hackerrank - Hackerrank test including multiple choice and 2 programming questions

Q1. Garbage collector internal implementation algorithm
Ans. 
Garbage collector is an automatic memory management system in Java that reclaims memory by deallocating objects no longer in use.
• Garbage collector uses different algorithms like Mark-Sweep, Mark-Compact, and Copying to reclaim memory.

• Mark-Sweep algorithm marks objects as reachable or unreachable, then sweeps through and deletes the unreachable objects.

• Mark-Compact algorithm moves reachable objects to one end of the mem...read more
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There is coding test consists of Easy / Medium DSA Question on Array/String/Hashing

Q1. Java 8 Feature, Immutable, OOPS, Hashmap Internal, Exception Handling, Multthreading lots of Qs asked( Synchonization , Lock ), Collection Framework, Singleton DP.
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Q1. Project Discussion, Spring Boot Microservice related FAQ, @Transactional, Qualifier, JPA related Question, Design APIs for a given Use Case & Apply Authentication & Authorization, SOLID Design Principles
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Q1. Explain Latest Project Architechture, asked Cross Question why RDBMS database , why not NoSQL DB used, How OAuth works/ how API Security implemented in your project, Explain any recent Prod Issue you have ...read more
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Q1. 1. Eager , Lazy Singleton Design Pattern. 2. Java 8 Stream , Functions (Predicate , Supplier , Consumer ) , Comparator Chaining 3. Designing Pattern -> Count Like / Seen any Post of Instagram , Reduce N/W...read more
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Q1. Project Architecture
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Q1. Informatica tech questions
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MCQ test consisting of 70 mcqs in 75 minutes from aptitude english and cs fundamentals. If cleared next paper 2 coding qs medium level

Q1. Two sum leetcode problem
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Q2. What problems you faced in your project
Ans. 
I faced challenges with integrating third-party APIs and debugging complex logic.
• Difficulty in understanding and implementing third-party APIs

• Issues with data synchronization between different systems

• Troubleshooting complex logic errors

• Managing dependencies and version conflicts

• Time constraints affecting problem-solving
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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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