Jd Sports Fashion Plc Senior SQA Engineer Interview Questions and Answers

Questions like reverse linked list, palindrome number etc..

Q1. Tech discussion on java, spring boot, distributed systems. Interview was very basic.
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3 sum problem was asked to complete

Take home project to design app

Q1. AWS questions, Behavioral questions
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Create some kind of system design (some kind of app)

The coding test was on hackerearth with 2 coding questions and Java based output questions.

Q1. 3 DSA questions on DP, binary search
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Q1. Prepare for Java, SQL & Unix and if you are experienced, you should know what your roles and responsibilities are
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Q1. Need to have an in depth knowledge of SQL concepts
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Basic Java Program

Q1. Find longest substring
Ans. 
Find the longest substring in an array of strings.
• Iterate through each string and compare with all other strings to find common substrings.

• Use a hash table to keep track of the frequency of each substring.

• Return the substring with the highest frequency.
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Mostly on js basics. Event loop, hoisting, GraphQL

Q1. How to implement Cadence algorithm
Ans. 
Cadence algorithm is used for real-time stream processing of data.
• Cadence is a distributed system for managing workflows.

• It uses a programming model called the Cadence Workflow Model.

• The Cadence server is responsible for managing the state of workflows.

• The Cadence client is responsible for executing the workflow tasks.

• Cadence provides a lot of features like retries, timeouts, and error handling.
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Q2. How does vdom works in react
Ans. 
VDOM stands for Virtual Document Object Model, which is a lightweight copy of the actual DOM used by React for efficient rendering.
• VDOM is a tree-like structure that React uses to keep track of changes in the UI.

• When a component's state changes, React creates a new VDOM tree and compares it with the previous one to identify the changes.

• React then updates only the parts of the actual DOM that need to be changed, resulti...read more
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