Persistent Systems Technical Analyst Interview Questions and Answers

Q1. React components life cycle
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Q2. Javascript splice and slice difference
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Q3. Given array of objects [{model: apple , price: 2000}, {model : apple , price : 1000}, {model: samsung , price: 500}] Return output as {apple : 1000, samsung :500} Ie flatten the array to map if model i...read more
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Q4. Java Restful webseries, separation of layers controller , service , repository
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Q5. Given employee class find 10th Max. Salary
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Q6. Given string : I am java developer return 4 non repeting character
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Q7. SQL find 10 max salary from employee table , can use offset and limit Postgresql function
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Q8. Thread pool executer fire 3 method in parallel and wait for all 3 to complete
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Q9. @async annotation usage how to make async api
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Q10. Lazy loading of beans in spring boot
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Q11. Spring boot beans life cycle
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IT was 2 hours of online exam through the AMCAT platform where the test contained English, Aptitude, and Technical questions.

They give you some topic and you have to discuss it among others.

Q1. First, they started by asking some of my details then they asked me some technical questions regarding DSA, and any coding language it's your preference.
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Q1. Some basic HR questions like how do you see yourself in 5 years and how you handle the pressure what are your weaknesses and strength.
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Scenario based question on ELK

Q1. What is react and virtual DOM
Ans. 
React is a JavaScript library for building user interfaces. Virtual DOM is a lightweight copy of the actual DOM.
• React allows developers to create reusable UI components

• Virtual DOM is a faster way to update the UI compared to traditional DOM manipulation

• React uses the virtual DOM to efficiently update the actual DOM

• Virtual DOM is a tree-like structure that represents the UI components

• React compares the previous and curr...read more
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Q2. Closure, promises, asyn await, hoisting
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Q1. Explain about Azure ADB2C
Ans. 
Azure Active Directory B2C is a cloud identity management solution for web and mobile applications.
• Allows users to sign up, sign in, reset passwords, and edit profiles

• Supports social identity providers such as Facebook, Google, and Microsoft

• Provides customizable user interface and branding options

• Offers built-in fraud detection and prevention measures

• Can be integrated with other Azure services such as Azure Functions a
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Q1. Explain about your current project architecture and technology, in which you worked?
Ans. You should explain in details, what is your project architecture and how the modules are linked with each other and how the API interaction is happening between Controller and explain the security layer as well.
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Q2. Explain Security authentication implementation and what are the delegation?
Ans. 
Security authentication implementation and delegation explained.
• Security authentication is the process of verifying the identity of a user or system.

• It involves the use of passwords, biometrics, tokens, or other methods to authenticate users.

• Delegation is the process of granting a user or system the authority to perform certain actions on behalf of another user or system.

• Examples of delegation include granting a user a...read more
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Q3. Write a program to get a employee list whose salary is greater than 50k and grade is above from A, Use Java 8 stream to get the list
Ans. 
Program to get employee list with salary > 50k and grade above A using Java 8 stream
• Create a list of employees with their salary and grade

• Use Java 8 stream to filter employees with salary > 50k and grade above A

• Return the filtered list of employees
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Q4. What is the AWS S3 lifecycle and how did you managed your case.
Ans. 
AWS S3 lifecycle is a set of rules to manage objects in S3 based on their age and usage.
• S3 lifecycle allows automatic transition of objects between different storage classes or deletion based on predefined rules.

• It helps in reducing storage costs and optimizing performance.

• For example, you can set a rule to move objects to Glacier storage class after 30 days of creation.

• I managed my case by setting up lifecycle policie...read more
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Q1. How did you implemented the microservices in your project, What are the api monitoring mechanism which you have used.
Ans. 
Implemented microservices using Docker and Kubernetes. Used Prometheus and Grafana for API monitoring.
• Implemented microservices architecture using Docker and Kubernetes

• Used Prometheus and Grafana for monitoring API performance and availability

• Configured alerts and dashboards in Grafana for real-time monitoring

• Implemented distributed tracing using Jaeger for end-to-end visibility

• Used Istio for service mesh and traffic m...read more
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Q2. How did you configure Api gateway to manage your microservices?
Ans. 
I configured API Gateway using AWS Console and created APIs for each microservice.
• Created a REST API in API Gateway

• Configured each microservice as a resource in the API

• Created methods for each resource and integrated with the microservice

• Configured authorization and throttling settings

• Deployed the API to a stage for testing and production

• Used AWS SDKs or CLI to automate the process
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Q1. General discussion about company and compensation.
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