WebPT Senior Software Engineer Interview Questions and Answers

Write a program to solve a challenging programming and algorithm problem.

Q1. Write a program to solve a challenging programming and algorithm problem.
Ans. 
Program to find the maximum subarray sum using Kadane's algorithm
• Initialize max_so_far and max_ending_here to 0

• Iterate through the array and update max_ending_here with the maximum of current element or current element + max_ending_here

• Update max_so_far with the maximum of max_so_far and max_ending_here
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Q2. Write a program to solve a second challenging programming and algorithm problem.
Ans. 
Implement a program to find the longest common subsequence of two strings.
• Use dynamic programming to solve this problem efficiently.

• Create a 2D array to store the lengths of longest common subsequences of substrings.

• Trace back the array to reconstruct the longest common subsequence.
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Q1. Topological sort to get list of operations to be performed.
Ans. 
Topological sort is used to order a directed graph's nodes in a way that all edges go from earlier to later nodes.
• Create a graph data structure to represent the dependencies between operations.

• Use a depth-first search algorithm to perform the topological sort.

• Start by selecting a node with no incoming edges as the first operation to be performed.

• Remove this node and its outgoing edges from the graph, then repeat the pr...read more
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Q2. Transliteration logic for European languages
Ans. 
Transliteration logic converts text from one script to another, typically preserving pronunciation.
• Transliteration is not the same as translation, it focuses on converting characters from one script to another.

• Commonly used for European languages like Greek, Cyrillic, and Latin scripts.

• Transliteration rules vary by language, for example, converting Cyrillic 'ш' to Latin 'sh'.
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Q1. What you do when your wifi is not connected with other device and you didn't get password
Ans. 
Try to troubleshoot the wifi connection issue by checking settings, restarting devices, and seeking help from IT support.
• Check if the wifi is turned on and the correct network is selected

• Restart the wifi router and the device

• Contact IT support for assistance in retrieving the password
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Q2. Find maximum value given an array with numbers and you can jump to any number and the value is jump length multiplied by value of location
Ans. 
Iterate through array, calculate value at each index, keep track of maximum value
• Iterate through the array and calculate the value at each index by multiplying jump length with value of location

• Keep track of the maximum value encountered during the iteration

• Return the maximum value found
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Data structures, Algorithms

Data Structures, Algorithms

Q1. Design a IP blocking system
Ans. 
Design an IP blocking system to prevent unauthorized access to a network.
• 1. Maintain a list of blacklisted IP addresses.

• 2. Implement a firewall to block incoming traffic from blacklisted IPs.

• 3. Regularly update the blacklist based on security threats.

• 4. Consider implementing rate limiting to prevent brute force attacks.

• 5. Monitor and log blocked IP addresses for analysis.
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Q1. Given a tree, connect it horizontally.
Ans. 
Connect nodes at the same level of a binary tree horizontally.
• Use a queue to traverse the tree level by level.

• For each level, connect the nodes in the queue from left to right.

• Set the right pointer of each node to the next node in the queue.

• Set the right pointer of the last node in the level to null.
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Q1. Design an algorithm to write content to a screen
Ans. 
Algorithm to write content to a screen
• Determine the type of content to be displayed

• Choose an appropriate font and font size

• Define the layout and positioning of the content

• Implement the algorithm to display the content on the screen
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Q1. Design an Elastic Load balancer
Ans. 
An Elastic Load Balancer distributes incoming traffic across multiple targets to ensure high availability and scalability.
• Choose the appropriate load balancer type (Application, Network, Classic)

• Configure health checks to ensure traffic is only sent to healthy targets

• Set up auto scaling groups to automatically add or remove targets based on traffic

• Use security groups to control access to the load balancer and targets

• Co...read more
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Q1. Project related questions
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Q1. HR Screening Round HR Screening Round
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Q2. How many years of experience
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System design on Low level design and High level design

Prepare well from leetCode

Q1. Learn System Design from Alex XU book
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Q1. Be polite and negotiate well
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