Stack Sdet Engineer Interview Questions and Answers

Q1. Difference between Severity, Priority and criticality?
Ans. 
Severity, Priority, and Criticality are different aspects of issue management in software testing.
• Severity refers to the impact of a defect on the system's functionality.

• Priority indicates the order in which defects should be fixed based on business needs.

• Criticality combines severity and priority to determine the overall importance of a defect.

• For example, a defect causing a system crash would have high severity, high...read more
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Q2. What id Equivalence partitioning?
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Equivalence partitioning is a software testing technique where input data is divided into partitions and only one value from each partition is tested.
• Input data is divided into groups or partitions based on similar characteristics

• One value from each partition is selected as a representative for testing

• Helps in reducing the number of test cases while ensuring maximum coverage

• Example: Testing a login form with valid, inv
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Q3. What id BackWord Compatibility?
Ans. 
Backward compatibility refers to the ability of a system to accept input intended for an older version of the system.
• Allows newer versions of software to work with data or systems from older versions

• Ensures that changes in the software do not break compatibility with existing data or systems

• Helps in smooth transition and adoption of new versions without disrupting existing processes
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Q4. What is Paradox in testing ?
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A paradox in testing refers to a situation where a test case both passes and fails at the same time.
• Paradox in testing can occur when a test case has conflicting requirements or conditions.

• It can also happen when there are errors in the test setup or execution that lead to unexpected results.

• For example, a test case may pass when run individually but fail when run as part of a test suite due to dependencies.

• Identifying...read more
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Q5. What id post put and patch?
Ans. 
PUT and PATCH are HTTP methods used for updating resources in RESTful APIs.
• PUT is used to update or replace an existing resource entirely

• PATCH is used to partially update an existing resource

• PUT is idempotent, meaning multiple identical requests will have the same effect as a single request

• PATCH is not idempotent, meaning multiple identical requests may have different effects
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Q1. What is clousers
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Q2. What is promises
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Q1. Explain javascript architecture
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Q2. What is mvvm architecture
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Q1. Manual testing concepts
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Q2. Test scenarios and execution
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Q1. Core java and code
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Q2. Oops concepts and implementation
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Oops concepts refer to object-oriented programming principles like inheritance, polymorphism, encapsulation, and abstraction.
• Inheritance: Allows a class to inherit properties and behavior from another class. Example: Parent class 'Animal' and child class 'Dog'.

• Polymorphism: Ability of an object to take on multiple forms. Example: Method overloading and overriding.

• Encapsulation: Bundling data and methods that operate on...read more
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First round was DSA and Projects you worked on.

Second round was DSA, Java and projects worked on

Q1. Why you want to join us?
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Q2. Why you are leaving your current org?
Ans. 
Seeking new challenges and growth opportunities.
• Looking for new challenges and opportunities for growth

• Interested in exploring different technologies and industries

• Seeking a better work-life balance

• Want to work in a more collaborative team environment
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It was a leetcode medium, related BFS,

Q1. Basic of android like fragment activity communication
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Q2. Why ViewModel is necessary, how does it save state
Ans. 
ViewModel is necessary in Android development to save and manage UI-related data during configuration changes.
• ViewModel helps in retaining data during configuration changes like screen rotations

• It separates UI-related data from UI controller (Activity/Fragment)

• ViewModel survives configuration changes and can be shared between fragments

• It helps in maintaining data consistency and prevents memory leaks

• ViewModel is lifecy...read more
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Hackerrank - 3 questions 2 hrs

Hackerrank test with medium questions

Q1. Machine coding round to design a shopping cart
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2 question of DSA (easy, medium) in 60 minutes

Q1. Playlist Shuffle
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Q2. Deletion in min heap
Ans. 
Deletion in min heap involves removing the root node and rearranging the heap to maintain the min heap property.
• To delete the root node in a min heap, swap it with the last node in the heap.

• Remove the last node and then heapify the heap starting from the root to maintain the min heap property.

• Example: If the min heap is [10, 20, 30, 25, 40], after deletion the heap becomes [20, 25, 30, 40].
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