Westpac Interview Questions, Process, and Tips

Q1. Array of integers nums and an integer target, return indices of 2 numbers that they add up to target
Ans. 
Return indices of 2 numbers in an array that add up to a target integer.
• Use a hash table to store the complement of each number in the array.

• Iterate through the array and check if the complement exists in the hash table.

• Return the indices of the two numbers that add up to the target.
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Q2. Given a string, return the longest palindromic substring string
Ans. 
Return the longest palindromic substring of a given string.
• A palindrome is a string that reads the same backward as forward.

• Use dynamic programming to solve the problem efficiently.

• Start with the longest possible substring and check if it's a palindrome.

• If it's not, try the next longest substring until you find a palindrome.

• Return the longest palindrome found.
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Q1. How would you build a high performing REST service, that calls a downstream API meant for "Notification" service? [Hint: Async service calls]
Ans. 
To build a high performing REST service for Notification API calls, use asynchronous service calls.
• Use asynchronous programming techniques like CompletableFuture or reactive programming to make non-blocking service calls.

• Implement circuit breakers and timeouts to handle potential failures and prevent cascading failures.

• Optimize the service by tuning thread pools, connection pools, and caching mechanisms.

• Consider using ...read more
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Q2. How would you test your REST API, while the downstream API that you are calling is not ready for test yet? [Hint: Mocks in Mockito]
Ans. 
Use Mockito to create mock objects for downstream API testing.
• Create a mock object using Mockito for the downstream API

• Define the behavior of the mock object to simulate responses

• Inject the mock object into the test environment to simulate the downstream API calls

• Write test cases to verify the functionality of the REST API using the mock object
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Rest based endpoints was required to be created for some scenario

Q1. OOPS concepts, System design
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Q2. Experience and question based on resume
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Q1. General questions about salary
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Q2. When can I join and culture fitment questions
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Q1. Explain MFE and SPA
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Q2. What is different between uncontrolled component and controlled component
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