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4,404 sdet interview questions shared by candidates

1. What is the difference between Interface and Abstract class? When you will use Interface and when Abstract Class? 2. What will you do if you need to add another method to an interface? Rest I don't remember.
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Software Engineer Professional QB4 (SDET )

Interviewed at Lexmark International

3.9★
May 25, 2016

1. What is the difference between Interface and Abstract class? When you will use Interface and when Abstract Class? 2. What will you do if you need to add another method to an interface? Rest I don't remember.

They asked me to solve a problem on finding the longest substring without repeating characters. I had to explain my approach step by step, then write and optimize the code using the sliding window technique

Software Development Engineer In Test (SDET)

Interviewed at Park Education

3.5★
Jul 16, 2025

They asked me to solve a problem on finding the longest substring without repeating characters. I had to explain my approach step by step, then write and optimize the code using the sliding window technique

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