Moonfrog Labs Software Engineer II Interview Questions and Answers

There were two coding questions; one was related to linked lists, and the other was linked to binary trees.

Q1. Can you elaborate on the project discussion you mentioned in your resume?
Ans. 
Developed a web application for tracking inventory and sales data
• Used React for front-end development

• Implemented RESTful APIs using Node.js and Express for back-end

• Utilized MongoDB for database management

• Integrated authentication and authorization features for secure access

• Implemented data visualization using Chart.js
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Q2. Can you provide the code to reverse a linked list?
Ans. 
Reversing a linked list involves changing the direction of pointers to go from the end to the beginning.
• Start by initializing three pointers: current, previous, and next.

• Iterate through the linked list, updating the pointers to reverse the direction of the links.

• Update the head of the linked list to point to the new first node, which was the original last node.
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Q3. Some questions were asked regarding the four pillars of Object-Oriented Programming (OOP)?
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Q4. Questions related to pointers, dangling pointers.
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Q1. Program for finding the perfect squares between two numbers.
Ans. 
Program to find perfect squares between two numbers
• Iterate through numbers between the given range

• Check if the square root of the number is an integer

• If yes, then it is a perfect square
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Q2. What are smart pointers in C++?
Ans. 
Smart pointers in C++ are objects that act like pointers but provide automatic memory management.
• Smart pointers help prevent memory leaks by automatically managing memory allocation and deallocation.

• Examples include unique_ptr, shared_ptr, and weak_ptr.

• unique_ptr is used for exclusive ownership, shared_ptr for shared ownership, and weak_ptr to prevent circular references.
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Q3. What is mutual exclusion in the context of concurrent programming?
Ans. 
Mutual exclusion is a concept in concurrent programming where only one thread can access a shared resource at a time.
• Ensures that only one thread can access a critical section of code at a time

• Prevents race conditions and data corruption

• Commonly implemented using locks, semaphores, or mutexes

• Example: Using a mutex to protect a shared variable in a multi-threaded application
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Q4. What is the process for implementing multithreading?
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Implementing multithreading involves creating and managing multiple threads to execute tasks concurrently.
• Identify the tasks that can be executed concurrently

• Create and manage multiple threads to execute these tasks simultaneously

• Use synchronization techniques like locks and semaphores to prevent race conditions

• Handle communication and coordination between threads

• Consider thread safety and resource sharing issues
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Different question were asked on sql python java

Q1. Write a sql query
Ans. 
SQL query to retrieve employee names and their salaries from a table
• Use SELECT statement to retrieve data

• Specify the columns you want to retrieve (employee names and salaries)

• Specify the table name where the data is stored
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Q2. Formula of vlookup
Ans. 
VLOOKUP is a function in Excel used to search for a value in a table and return a corresponding value.
• VLOOKUP searches for a value in the first column of a table and returns a value in the same row from a specified column.

• The formula syntax is =VLOOKUP(lookup_value, table_array, col_index_num, [range_lookup]).

• Example: =VLOOKUP(A2, B2:D10, 3, FALSE) will search for the value in cell A2 in the range B2:D10 and return the...read more
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3 online dsa questions easy to medium

SQL Coding Test - asked 5 queries related to joins, ranks, group by

Asked guesstimates, technical CV Question, case

Asked guesstimate, market entry question, case

One hour aptitude test based on the mathematics ,logical reasoning.

Q1. One basic question on the language you know and one SQL is asked
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Q2. SQL query questions
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Q1. What is bug in any application?
Ans. 
A bug in an application is an error, flaw, failure, or fault in the software code that causes it to produce incorrect or unexpected results.
• Bugs can range from simple syntax errors to complex logic issues.

• Common types of bugs include logic errors, syntax errors, and runtime errors.

• Examples of bugs include a calculator app displaying incorrect results, a website crashing when a specific button is clicked, or a game free
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Q1. What is the life cycle of bug?
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Bug life cycle includes identification, reporting, fixing, retesting, and closing.
• Identification: Bug is identified by testers during testing.

• Reporting: Testers report the bug to developers.

• Fixing: Developers fix the bug in the code.

• Retesting: Testers retest the fixed bug to ensure it is resolved.

• Closing: Once bug is confirmed fixed, it is closed.
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Q1. Why team bonding is needed for healthy work culture?
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