Exotel Regional Sales Manager Interview Questions and Answers

Q1. Round 1 was hackerrank test. MCQs and coding questions.
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Q2. Kafka related questions.
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Q3. Java 8 related questions. Java streams.
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Q1. Multithreading and Java8 coding question
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Q2. System design question on payments, design patterns and Java, Spring Questions
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Q1. System design for robust e-commarce site
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Q2. How to reduce the failure rate for payment gateway which is communicating to multiple 3rd party wallets and credit card transactionm
Ans. 
Implementing strategies to enhance reliability and reduce failure rates in payment gateway integrations.
• Implement retries with exponential backoff for failed transactions to handle temporary issues.

• Use circuit breakers to prevent overwhelming third-party services during outages.

• Monitor and log transaction failures to identify patterns and root causes.

• Implement fallback mechanisms to alternative payment methods when pri...read more
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Q1. It was more into problem solving using python
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FInd 3 numbers in an array whose sum = k.

Q1. Past projects I have worked on
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Q2. Design a Elevator system
Ans. 
Design an Elevator system for efficient vertical transportation
• Consider the number of floors in the building

• Implement a scheduling algorithm to optimize elevator movement

• Include safety features such as emergency stop button

• Allow for both manual and automatic operation

• Consider peak hours and traffic flow in the building
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Q1. Starting from full form of SQL to RDBMS, CTE and some most common window functions, they asked everything. Questions were easy.
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