DTDC Express Senior Sdet Test Engineer Interview Questions and Answers for Experienced

It was a normal aptitude test with mathematical questions.

It was a techno-coding test where I had to code while sharing my screen on a live conversation with the interviewer.

Q1. I was primarily asked about managerial questions on adaptability to new technology and creativity if existing solutions don't work.
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Q2. In a situation where your team is not getting a proper result with existing approach your team uses, how would you try to fix it?
Ans. 
I would analyze the current approach, identify the root cause of the issue, brainstorm alternative solutions, and collaborate with the team to implement and test them.
• Analyze the current approach to identify weaknesses

• Brainstorm alternative solutions with the team

• Implement and test the new solutions

• Regularly communicate and collaborate with team members
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Q1. About the experience and what I did
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Give me a palindrom of string related question

Q1. System design based on how to scale something
Ans. 
To scale a system, consider horizontal and vertical scaling, load balancing, caching, database sharding, and microservices architecture.
• Implement horizontal scaling by adding more instances of the application to distribute the load.

• Consider vertical scaling by upgrading the hardware resources of the existing server.

• Use load balancing to evenly distribute incoming network traffic across multiple servers.

• Implement cachin...read more
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Q1. How to identify and solve race condition.
Ans. 
Identifying and solving race conditions involves understanding concurrent execution and implementing synchronization mechanisms.
• Understand the critical sections of code where race conditions can occur

• Use synchronization mechanisms like locks, semaphores, or atomic operations to control access to shared resources

• Implement thread-safe data structures or use thread-safe libraries to avoid race conditions

• Use tools like sta...read more
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Q2. Solve an array question on finding the third largest in an unsorted array.
Ans. 
Find the third largest element in an unsorted array of strings.
• Sort the array in descending order.

• Remove duplicates if necessary.

• Return the element at index 2 as the third largest.
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Given 3 strings S, S1, S2 containgin M, N and k characters respectively, task is to modify string by replaicing all substring S1 with S2 and S

Q1. Api optimisations, query optimisations, how to keep code more extensible, scalable etc
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Q1. Questions related to designing around redis
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Q1. They asked my previous job profile and my future prospects
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