Freshworks Staff Software Engineer Interview Questions and Answers

Normal online code / frontend test

Q1. How would you build book my show
Ans. 
Designing and building a platform similar to BookMyShow involves creating a user-friendly interface for booking tickets for various events.
• Develop a user-friendly website and mobile app for users to browse and book tickets for movies, concerts, plays, etc.

• Implement a secure payment gateway for users to make online transactions.

• Integrate a database to store information about events, venues, tickets, and user bookings.

• In...read more
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Q1. Solid principals, awareness of patterns
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Q1. How would you build tinyurl like service, systems designs
Ans. 
To build a tinyurl-like service, design a system with a URL shortening algorithm, a database to store mappings, and a redirect service.
• Use a hashing algorithm to generate short URLs from long URLs (e.g. MD5, SHA-256).

• Store the mappings of short URLs to long URLs in a database (e.g. MySQL, Redis).

• Implement a redirect service that takes a short URL, looks up the corresponding long URL in the database, and redirects the u...read more
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Q1. Non-technical questions
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Q1. SOLID Principles
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Q1. Rate Limiter with possible test cases
Ans. 
Rate limiter is a mechanism to control the rate of requests sent to a server
• Implement a sliding window algorithm to track the number of requests within a specific time frame

• Set a limit on the number of requests allowed per unit of time

• Return an error response when the limit is exceeded

• Test cases: 1. Send requests below the limit - should be successful. 2. Send requests above the limit - should receive an error response
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Q1. Rank teams based on some criteria
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Q1. Job scheduler system design round
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Q1. Difference. Between concurrent hash map and synchronised hashmap
Ans. 
ConcurrentHashMap allows multiple threads to access and modify the map concurrently, while SynchronizedHashMap ensures thread-safety by allowing only one thread to access the map at a time.
• ConcurrentHashMap is more efficient in scenarios with high concurrency as it allows concurrent read and write operations.

• SynchronizedHashMap is simpler to use and provides thread-safety, but can lead to performance degradation in hig...read more
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Q2. Semaphores in java how to implement
Ans. 
Semaphores in Java are used for controlling access to a shared resource. They can be implemented using the java.util.concurrent package.
• Use the Semaphore class from the java.util.concurrent package

• Create a Semaphore object with an initial number of permits

• Use the acquire() method to acquire a permit before accessing the shared resource

• Use the release() method to release a permit after accessing the shared resource
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Q3. Bitmask in Postgresql how to use
Ans. 
Bitmask in Postgresql is used to store and manipulate multiple boolean values within a single integer column.
• Bitmask is a technique to represent a set of boolean flags using binary digits.

• In Postgresql, the bitwise operators (&, |, ^, ~) can be used to perform operations on bitmasks.

• To set a specific flag in a bitmask, use the bitwise OR operator (|).

• To check if a flag is set in a bitmask, use the bitwise AND operator ...read more
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Q4. Swap character from uppercase to lowercase and lowercase to uppercase Zscalar ->zSCALAR without using 1.util function 2.arithimatic operator 3.map 4.array function
Ans. 
Swap characters from uppercase to lowercase and lowercase to uppercase in a given string.
• Iterate through each character in the string

• Check if the character is uppercase or lowercase

• Swap the case of the character using bitwise XOR operation

• Build the resulting string with the swapped characters
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Q5. How to create singleton ensuring reflection does not mess up the implementation
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To create a singleton ensuring reflection does not mess up the implementation, use an enum or a private constructor with a static field.
• Use an enum to create a singleton as enums are inherently singletons and cannot be instantiated multiple times.

• Alternatively, use a private constructor with a static field to create a singleton.

• To prevent reflection from creating multiple instances, throw an exception in the constructo
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Q1. Technical interview includes questions in dotnet core, C# , angular and SQL. It includes questions like middleware,startup.cs file configuration, dependency injection,cors and char frequency counter progra...read more
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Q1. In this round we had discussion regarding previous company project and ReactJS including concepts like life cycle , hooks and state management. It also includes scenario based questions related to team man...read more
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Q1. Mostly about yourself and salary discussion
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Q1. Rotated array search
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Q1. System design HLD
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Q1. System design LLD
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Q1. Manager round one on one
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I attended through campus placement.they gave a general topic and ask us to speak

Q1. What is variable html structure coding in array
Ans. 
A variable is a storage location in a computer program that holds data and can be referenced and manipulated.
• Variables are used to store data in a program and can be of different types such as integers, strings, or arrays.

• In HTML, variables are not directly used, but data can be stored in attributes or elements for manipulation.

• Coding in an array involves storing multiple values in a single variable, accessed by index
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Q1. It was just a simple general discussion about the timings
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