Amdocs Senior Software Engineer Interview Questions and Answers

A code to identify errors and write Junit. Optimise the code as well.

Q1. Stacks using queue
Ans. 
Implementing a stack using two queues
• Use two queues to simulate a stack

• Push operation: Enqueue the element to queue 1

• Pop operation: Dequeue all elements from queue 1 to queue 2, dequeue the last element from queue 1, then swap the queues

• Top operation: Return the front element of queue 1

• Example: Push 1, 2, 3 - Queue 1: [1, 2, 3], Queue 2: []

• Example: Pop - Queue 1: [1, 2], Queue 2: [3]
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Q2. BFS and Knapsack problem, previous project experience
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Q1. How do you convert Monolith to Microservices?
Ans. 
Convert Monolith to Microservices involves breaking down a large application into smaller, independent services.
• Identify bounded contexts within the monolith

• Decompose the monolith into separate services based on identified bounded contexts

• Implement communication between services using APIs or messaging queues

• Use containerization technologies like Docker for deployment

• Implement service discovery and load balancing for e...read more
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Q2. What would you use to store password? String or CharArray?
Ans. 
CharArray should be used to store passwords for security reasons.
• CharArray is more secure as it can be cleared from memory after use, unlike String which is immutable

• String objects are stored in the String pool and can be accessed by other parts of the program

• CharArray allows for more control over the password data and reduces the risk of exposure
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Q3. What is an API Gateway in Microservices?
Ans. 
API Gateway in Microservices acts as a single entry point for all client requests to access multiple microservices.
• API Gateway handles authentication, authorization, load balancing, caching, and routing of requests to appropriate microservices.

• It helps in decoupling client applications from individual microservices, providing a more centralized and manageable architecture.

• Examples of API Gateways include Netflix Zuul, ...read more
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Q4. What is a Spring Actuator?
Ans. 
Spring Actuator is a feature in Spring Boot that allows monitoring and managing the application.
• Spring Actuator provides endpoints to monitor application health, metrics, info, etc.

• It helps in understanding the internal state of the application and its performance.

• Actuator endpoints can be accessed over HTTP, providing useful information for monitoring tools.

• Example: /actuator/health, /actuator/metrics, /actuator/info
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Q1. On spring, boot, java
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Q1. Difference between prototype and singleton scope
Ans. 
Prototype scope creates a new instance for each injection, while singleton scope creates a single instance for all injections.
• Prototype scope creates a new instance every time it is injected, while singleton scope creates a single instance for all injections.

• Prototype scope is useful when you want a new instance each time, like for stateful objects. Singleton scope is useful for sharing a single instance, like for stat...read more
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Mixed questions of LR , SQL , Java and Unix

Q1. F2F interview about background
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Q2. Java related question
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Q1. Basic question location
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