Bharti Airtel Sdet Lead Interview Questions and Answers

Q1. OOPs Concepts, like Abstraction, Polymorphism, Encapsulation etc.
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Q2. Write java program to reverse a string.
Ans. 
Java program to reverse a string
• Create a char array from the input string

• Use two pointers to swap characters from start and end of the array

• Convert the char array back to a string and return
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Q3. API error codes meanings.
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API error codes are numerical or alphanumeric codes that indicate the type of error that occurred during an API request.
• API error codes help developers identify and troubleshoot issues with their API requests.

• Common API error codes include 400 Bad Request, 401 Unauthorized, 404 Not Found, 500 Internal Server Error.

• Each API error code has a specific meaning and can provide valuable information for debugging.
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Q4. Exceptions encountered during Automation.
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Exceptions encountered during automation testing can include element not found, timeout, invalid input, etc.
• ElementNotVisibleException: When an element is present in the DOM but not visible on the page

• TimeoutException: When a command takes longer than the timeout specified

• NoSuchElementException: When an element could not be found in the DOM

• StaleElementReferenceException: When an element is no longer attached to the DOM

• ...read more
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App is taking long to process a functionality what could be the possible reasons?

Project discussion and basic questions

Q1. Willing to relocate
Ans. 
Yes, willing to relocate for the right opportunity.
• I am open to relocating for a job that aligns with my career goals and offers growth opportunities.

• I have relocated in the past for job opportunities and have found it to be a positive experience.

• I understand the importance of being flexible and adaptable in today's job market, which includes being open to relocation.
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Q2. What is ur weakness
Ans. 
One of my weaknesses is that I tend to be overly critical of my own work.
• I have a tendency to overanalyze my projects, which can sometimes lead to delays in completion.

• I am working on improving my self-confidence to trust my abilities more.

• I have learned to seek feedback from others to gain different perspectives and improve my work.
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Test is proctored and 3 questions were asked out of which 1 is from language other is from data structures and the last one is from sql

Q1. What is a database and explain it
Ans. 
A database is a collection of organized data that can be easily accessed, managed, and updated.
• A database stores data in tables with rows and columns

• It allows for efficient data retrieval and manipulation

• Examples include MySQL, Oracle, and MongoDB
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Q2. What are the projects you have done
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Easy questions based on DSA

Q1. Given binary tree tell visible nodes from below
Ans. 
Visible nodes in a binary tree are the nodes that are not blocked by any other nodes when viewed from below.
• Traverse the binary tree level by level and keep track of the maximum value seen at each level. Any node with a value greater than the maximum value seen so far is considered a visible node.

• Example: For a binary tree with values [5, 3, 8, 1, 4, 7, 9], the visible nodes from below would be [5, 8, 9].
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Q2. Reverse kth node in linked list
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Reverse the kth node in a linked list
• Traverse the linked list to find the kth node

• Reverse the kth node by changing its next pointer to point to the previous node

• Update the pointers of the previous and next nodes accordingly

• Handle edge cases such as k being out of bounds or kth node being the head of the list
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Q3. Project related questions on mongodb
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Q1. Java basics, automation basics.
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Q1. Group anagram strings in a array
Ans. 
Group anagram strings in an array
• Iterate through the array of strings

• For each string, sort the characters alphabetically

• Use a hashmap to group anagrams together based on sorted strings
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Q2. Reverse subset of array 'k'
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Reverse a subset of strings in an array 'k'
• Iterate through the array 'k' and reverse the strings within the specified subset range

• Use a temporary variable to swap the strings at the start and end of the subset range

• Ensure to handle edge cases like empty array or invalid subset range
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