TIAA Global Business Services Senior Software Engineer Interview Questions and Answers for Experienced

Basic python and data structure, time complexity of programs

Q1. Oops concepts in depth
Ans. 
Object-oriented programming principles for organizing and designing code.
• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Inheritance: Allowing a class to inherit properties and behavior from another class.

• Polymorphism: Ability for objects to take on multiple forms or types.

• Abstraction: Hiding complex implementation details and showing only necessary features.
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Q1. Role: Java+ React Full stack I had 2 rounds of interview so far. 1) First round was all about the fundamentals of react and java. It was a virtual one-o-one. Questions on java String, java classes and ...read more
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Q1. Already shared in my prev response
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Q1. Internal working of hashMap
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a collision occurs and the key-value pairs are stored in a linked list at that index.

• To retri...read more
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Q2. Multithreading [Threads vs Processes]
Ans. 
Threads are lightweight processes within a single process, sharing memory space. Processes are independent instances of a program.
• Threads share memory space, making communication between threads faster and more efficient.

• Processes have their own memory space, making them more isolated and secure.

• Threads are faster to create and terminate compared to processes.

• Processes are more stable and reliable, as a crash in one pr...read more
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Medium level DSA Questions were asked

Q1. Questions about Java8
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Q2. SQL queries and spring boot
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Q1. Current project
Ans. 
Currently working on developing a web-based project management tool for a tech startup.
• Utilizing React for front-end development

• Implementing Node.js for back-end functionality

• Integrating MongoDB for database management
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Hacker rank coding round - string and array - medium to hard

Q1. DSA Round with a focus on strings and trees questions
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Q1. UI coding round
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Q2. Quesitons on JS, TS, Angular and React
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Q1. System Design Round
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Q2. HLD and LLD for Zomato (Food Delivery App)
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Q1. Culture Fitment Round
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Q2. General Techno Managerial Questions
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Q1. What is difference between @primary and @Qualifier?
Ans. 
Primary is used to define a primary bean when multiple beans of the same type are present, while Qualifier is used to specify which bean to autowire when multiple beans of the same type are present.
• Primary annotation is used to give a higher preference to a bean when multiple beans of the same type are present in the Spring application context.

• Qualifier annotation is used to specify which bean to autowire when multiple...read more
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Q2. How we can handle fault tolerance in Microservices?
Ans. 
Fault tolerance in Microservices can be achieved through redundancy, graceful degradation, and circuit breakers.
• Implementing redundancy by having multiple instances of each microservice running to handle failures.

• Using graceful degradation to ensure that the system can still function even if certain microservices are unavailable.

• Utilizing circuit breakers to prevent cascading failures by temporarily stopping requests t
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Q3. How to implement spring security?
Ans. 
Implementing Spring Security involves configuring security settings in the Spring application.
• Add Spring Security dependency in pom.xml

• Configure security settings in SecurityConfig class

• Define user roles and permissions

• Use annotations like @EnableWebSecurity and @Secured
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Q4. Explain OAuth 2 implementation?
Ans. 
OAuth 2 is an authorization framework that allows a third-party application to obtain limited access to an HTTP service.
• OAuth 2 is used for delegated access, allowing a user to grant a third-party application access to their resources without sharing their credentials.

• It involves the use of access tokens, which are issued by the authorization server after the user authenticates and authorizes the application.

• OAuth 2 su...read more
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Q1. Memory management in Java ?
Ans. 
Java uses automatic memory management through garbage collection to allocate and deallocate memory.
• Java uses garbage collection to automatically manage memory by deallocating objects that are no longer needed.

• The JVM has a heap where objects are allocated and garbage collection is performed to reclaim memory.

• Java provides the 'finalize()' method for objects to perform cleanup before they are garbage collected.

• Memory le...read more
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Q2. Different types of gc?
Ans. 
Different types of garbage collection algorithms in software development.
• Mark and Sweep: Identifies and removes unreachable objects.

• Generational: Divides objects into different generations based on age.

• Parallel: Uses multiple threads to perform garbage collection concurrently.

• Incremental: Spreads garbage collection work over multiple cycles to reduce pause times.
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Q3. Difference between executors &executorservice?
Ans. 
Executors are a class that provides factory and utility methods for Executor, ExecutorService is an interface that represents an asynchronous execution service.
• Executors class provides factory and utility methods for Executor interface

• ExecutorService is an interface that represents an asynchronous execution service

• ExecutorService extends Executor interface

• ExecutorService provides methods to manage termination and produ...read more
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Q1. Arraylist find duplicate
Ans. 
Find duplicates in an ArrayList of strings.
• Iterate through the ArrayList and use a HashSet to keep track of seen elements.

• If an element is already in the HashSet, it is a duplicate.

• Store the duplicates in a separate ArrayList or print them directly.
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