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6,461 software development engineer in de test interview questions shared by candidates

What are the main interfaces in the Java Collections Framework? What are the differences between HashSet and TreeSet? What is the difference between HashMap and Hashtable? Explain the difference between Comparator and Comparable. How do you iterate over a List in Java? What is the difference between Queue and Deque? What is the difference between ArrayList and Vector? How does a ConcurrentHashMap work?
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Software Development Engineer In Test (SDET)

Interviewed at Mastercard

4.1★
Jul 12, 2024

What are the main interfaces in the Java Collections Framework? What are the differences between HashSet and TreeSet? What is the difference between HashMap and Hashtable? Explain the difference between Comparator and Comparable. How do you iterate over a List in Java? What is the difference between Queue and Deque? What is the difference between ArrayList and Vector? How does a ConcurrentHashMap work?

1st round questions: Discussion about my roles and responsibilities in my current company Overview of automation framework Linux commands, server connecting command Problem solving question to find unique characters out of a string Java question (difference between JVM,JRE,JDK) Apart from this there were few more questions. 2nd round: The discussion was heavily focused on syntax-level details — for example, being asked to write specific code that is typically referenced or reused from existing test frameworks or classes. Additionally, there were questions about exact syntax from work I had done around two years ago, which may not fully reflect current skills or how automation engineers approach problem-solving today.
avatar

Software Development Engineer In Test (SDET)

Interviewed at Payoneer

3.6★
Jun 24, 2025

1st round questions: Discussion about my roles and responsibilities in my current company Overview of automation framework Linux commands, server connecting command Problem solving question to find unique characters out of a string Java question (difference between JVM,JRE,JDK) Apart from this there were few more questions. 2nd round: The discussion was heavily focused on syntax-level details — for example, being asked to write specific code that is typically referenced or reused from existing test frameworks or classes. Additionally, there were questions about exact syntax from work I had done around two years ago, which may not fully reflect current skills or how automation engineers approach problem-solving today.

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