Calix Principal Software Engineer Interview Questions and Answers

Q1. What challenges you have faced and solutioning you have done in your current project?
Ans. 
I have faced challenges in integrating legacy systems with modern technologies and have solved them by creating a robust API layer.
• Integrating legacy systems with modern technologies

• Creating a robust API layer for seamless communication

• Resolving compatibility issues between different systems
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Q2. How security you have handled in your application ?
Ans. 
Security in the application is handled through a combination of encryption, authentication, authorization, and regular security audits.
• Implemented encryption for sensitive data to prevent unauthorized access

• Utilized authentication mechanisms such as OAuth or JWT to verify user identities

• Implemented role-based access control to restrict user permissions

• Regularly conducted security audits and penetration testing to ident
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Q3. Coding problem to design REST APIs to update Employee First name in the database ?
Ans. 
Design REST APIs to update Employee First name in the database
• Create a PUT endpoint '/employees/{id}' to update employee first name

• Use proper authentication and authorization mechanisms to secure the API

• Validate input data to prevent SQL injection or other security vulnerabilities
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Q4. Have you worked on gRPC , Kafka and payment gateway ?
Ans. 
Yes, I have experience working with gRPC, Kafka, and payment gateways.
• I have implemented gRPC for building high-performance, scalable APIs.

• I have used Kafka for real-time data streaming and processing.

• I have integrated payment gateways like PayPal and Stripe for secure online transactions.
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Q5. What tools you have used for Unit testing ?
Ans. 
I have used tools like JUnit, NUnit, and MSTest for unit testing.
• JUnit

• NUnit

• MSTest
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Q1. What are your accomplishments, weakness in your previous projects ?
Ans. 
I have successfully led multiple projects to completion, but my weakness is sometimes struggling with delegation.
• Successfully led a team in the design and implementation of a complex software system

• Delivered projects on time and within budget

• Weakness in delegation led to occasional delays in project milestones

• Implemented strategies to improve delegation skills and streamline project management processes
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Q2. Reason was asked of leaving each of the previous companies
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Multi-threading implementation with Thread and Runner.

Draw architecture diagram from the given statement