Senior Staff Software Engineer Interview Questions and Answers

Check if a string of parenthesis is valid or not.

• Use a stack to keep track of opening parenthesis.

• Iterate through the string and push opening parenthesis onto the stack.

• When encountering a closing parenthesis, pop from the stack and check if it matches the corresponding opening parenthesis.

• If stack is empty at the end and all parenthesis have been matched, the string is valid.

Database index is a data structure that improves the speed of data retrieval operations.

• Indexes are created on one or more columns of a table.

• They work by creating a separate data structure that contains the indexed column(s) and a pointer to the actual data.

• This allows the database to quickly locate the data based on the indexed column(s).

• Indexes can be clustered or non-clustered, depending on how the data is physically stored on disk.

• Clustered indexes determine the physical...read more

Design a web crawler system to gather information from websites

• Identify the websites to crawl and the specific information to extract

• Implement a system to crawl the websites and extract the desired information

• Store the extracted data in a database for further analysis

• Consider scalability and efficiency in the design of the web crawler system

JVM internal model is the way in which JVM manages and executes Java code.

• JVM has a class loader subsystem that loads classes into memory

• JVM uses a stack-based architecture for executing code

• JVM has a garbage collector that manages memory allocation and deallocation

• JVM has a Just-In-Time (JIT) compiler that compiles bytecode to machine code for faster execution