Persistent Systems Cloud Architect Interview Questions and Answers

Singleton Pattern with coding example class

Q1. Service lifetime
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Q2. Shared or static class
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Q1. What is gang of four design pattern.
Ans. 
Gang of Four design patterns are a set of 23 software design patterns that were introduced in the book 'Design Patterns: Elements of Reusable Object-Oriented Software'.
• Gang of Four design patterns were identified by Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides.

• These patterns are categorized into three groups: creational, structural, and behavioral.

• Examples of Gang of Four design patterns include Singlet
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Q1. Use Cases and scenarios
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Q1. Normal cultural round
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Q1. Salary discussion
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Q1. Design a web app for an ecommerce
Ans. 
Design an ecommerce web app
• Include a user-friendly interface for easy navigation

• Integrate a secure payment gateway for transactions

• Provide detailed product descriptions and high-quality images

• Include a search bar and filters for easy product discovery

• Allow customers to create accounts and save their preferences

• Provide customer support through chat or email

• Include a review and rating system for products

• Offer promotions
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Q2. How to scale a system to 1 million users
Ans. 
To scale a system to 1 million users, optimize database, use load balancing, and implement caching.
• Optimize database by indexing frequently queried data and partitioning tables

• Use load balancing to distribute traffic across multiple servers

• Implement caching to reduce database queries and improve response time

• Consider using a content delivery network (CDN) to serve static assets

• Use horizontal scaling by adding more serv...read more
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Q1. System design , current project architecture
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Q1. Salary discussion , basic hr question
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