Google Senior Software Engineer Interview Questions, Process, and Tips

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. Design object store like amazon s3
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Q1. Clone the tree as mirror image
Ans. 
Clone a tree by creating a mirror image of it
• Traverse the original tree in a post-order manner

• Create a new node for each visited node and assign its value

• Recursively set the left child of the new node as the mirrored right child of the original node

• Recursively set the right child of the new node as the mirrored left child of the original node
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Q2. DP Problem with 2d
Ans. 
Dynamic programming problem involving a 2D array
• Break down the problem into subproblems and store the results in a 2D array

• Consider using top-down or bottom-up approach depending on the problem

• Examples: Longest Common Subsequence, Minimum Path Sum
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Live coding test similar to leet code

Q1. My previous experiece
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Q2. My currrent experience
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Coding test with 2 questions

Q1. System Design with LLD implementation
Ans. 
System design involves creating a high-level design of a software system, followed by implementing the detailed low-level design.
• Start by understanding the requirements and constraints of the system

• Create a high-level design that outlines the components and interactions of the system

• Implement the detailed low-level design, considering factors like scalability, performance, and maintainability

• Use tools like UML diagrams...read more
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Q1. System Design with HLD
Ans. 
System Design with HLD involves designing the high-level architecture of a software system.
• Understand the requirements and constraints of the system

• Identify the components and their interactions

• Consider scalability, reliability, and performance

• Use design patterns and best practices

• Create diagrams like UML or flowcharts to visualize the design
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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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Question on managing restaurant order queue - Can we solved used Map + Priority Query

Question on finding culprit PR which broke the build

Q1. Design ID generator service
Ans. 
Design a scalable ID generator service for unique identification of entities.
• Use a combination of timestamp, unique machine identifier, and sequence number to generate IDs.

• Implement a distributed system to ensure uniqueness of generated IDs.

• Consider using a centralized service for ID generation to avoid conflicts.

• Use a high-performance database for storing generated IDs.

• Implement error handling and retry mechanisms in
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