Salesforce Senior Member Technical Interview Questions and Answers

Q1. Sum of principal diagonal elements of a matrix
Ans. 
The sum of principal diagonal elements of a matrix is calculated by adding the elements from the top left to bottom right.
• Add the elements from the top left to bottom right of the matrix to get the sum of principal diagonal elements.

• For example, in a 3x3 matrix [[1, 2, 3], [4, 5, 6], [7, 8, 9]], the principal diagonal elements are 1, 5, and 9. Their sum would be 15.
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Q1. Count no of links in as web page
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To count the number of links on a web page, you can use a web scraping tool or inspect the page's HTML code.
• Use a web scraping tool like BeautifulSoup or Selenium to extract all the links from the webpage.

• Inspect the HTML code of the webpage and look for anchor tags (<a>) which contain the links.

• Count the number of anchor tags to determine the total number of links on the webpage.
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Q2. Remove zeros from arrays list
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Remove zeros from arrays list of strings
• Iterate through each string in the array

• Use filter method to remove zeros from each string

• Return the updated array without zeros
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Q3. Return type of Findelements
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FindElements method returns a list of web elements matching the specified locator.
• Return type of FindElements is List

• It returns a list of all elements matching the specified locator

• Example: List elements = driver.findElements(By.xpath("//input[@type='text']"));
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Q4. Find second highest vowel occurance in a string
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Find the second highest occurrence of a vowel in a string.
• Iterate through the string and count the occurrences of each vowel (a, e, i, o, u).

• Store the counts in an array and find the second highest count.

• Return the vowel with the second highest count.
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Q5. Write locator for element in webpage
Ans. 
Use CSS selector to locate element on webpage
• Use unique id or class names to locate element

• Use CSS selectors like 'id', 'class', 'name', 'tag name', etc.

• Use XPath if necessary for complex element locating
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Q1. 1. List and Arraylist Differences 2. What happens when element with same key is added into HashMap 3.Spring boot beans and how we can avoid bean instantiation 4.Profile annotation in spring 5.what are the ...read more
Ans. 
Explanation of differences between List and ArrayList, HashMap behavior with same key, Spring boot beans, Profile annotation in Spring, database configurations in pom.xml, and data structures.
• List is an interface while ArrayList is a class that implements List interface

• HashMap replaces the old value with the new value if the same key is added

• Spring boot beans can be avoided by using @Lazy annotation

• Profile annotation i...read more
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Q2. Programs: 1. Write program to return list of duplicate integer using int array 2. Write program to return square of integers in ascending order input:[-4,0,3,5] output:[0,9,16,25]
Ans. 
Program to return square of integers in ascending order from input array
• Iterate through the input array and calculate the square of each integer

• Store the squares in a new array and sort it in ascending order

• Return the sorted array of squares
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DSA - Balanced parenthesis variant

DSA - string manipulation

DP - Medium level problem

Puzzles - Find the fastest 3 horses

Q1. Advantage disadvantage of monolith and microservices
Ans. 
Monolith has simplicity but lacks scalability, while microservices offer flexibility but introduce complexity.
• Monolith: Simplicity in development and deployment, easier to debug and test

• Monolith: Lack of scalability, all components tightly coupled

• Microservices: Flexibility to use different technologies for different services

• Microservices: Scalability, each service can be independently scaled

• Microservices: Increased com...read more
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Q2. Lock and Synchronised difference
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Lock and Synchronised are both mechanisms used for thread synchronization in Java.
• Lock is a more flexible and powerful mechanism compared to synchronized keyword in Java.

• Lock interface provides more functionalities like tryLock(), lockInterruptibly(), etc.

• Lock allows for more fine-grained control over locking and unlocking of resources.

• Synchronized keyword is simpler to use but may lead to deadlocks in complex scenario...read more
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Basic DSA problem on BST

Problem solving on 3 sum array

Q1. HLD on online chat service
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Q2. Design 1:1 chat first
Ans. 
Design a 1:1 chat feature for seamless communication between two users.
• Implement real-time messaging functionality

• Include features like read receipts, typing indicators, and message timestamps

• Allow users to share multimedia content such as images and videos

• Provide options for users to customize their chat settings and notifications
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Q3. Include media such as photo and video
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Q1. Hiring manager round
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Q2. Including behavioural question
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Q1. Moderate complexity Problem solving skill test Behavioural questions
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Q1. - lillye challenging compare to round 1
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Q1. - Overall produc level discussion
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