Arista Networks Software Engineer Interview Questions and Answers

Q1. Trie based question
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Q2. Design LRU cache
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Design a data structure for LRU cache with get and put operations, evicting least recently used item when capacity is reached.
• Implement a doubly linked list to keep track of the order of keys based on their usage

• Use a hashmap to store key-value pairs for quick access

• Update the order of keys in the linked list when a key is accessed or inserted

• Evict the least recently used item when the cache reaches its capacity
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Q1. Unique ID generator
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A unique ID generator creates distinct identifiers for entities, ensuring no duplicates across a system.
• Use UUIDs (Universally Unique Identifiers) for global uniqueness. Example: '550e8400-e29b-41d4-a716-446655440000'.

• Timestamp-based IDs can ensure uniqueness over time. Example: '20231005123000' for a timestamp.

• Combining user-specific data with random elements can create unique IDs. Example: 'user123-abc456'.

• Consider u...read more
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Q2. Project related questions
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Q1. Operating systems, DBMS
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Q2. Few question on projects from my previous company
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Q1. Tell me about your previous company role ?
Ans. 
I was a software engineer responsible for developing and maintaining web applications for a financial services company.
• Developed and maintained web applications using technologies such as Java, Spring, and Angular

• Collaborated with cross-functional teams to gather requirements and deliver solutions

• Participated in code reviews and testing to ensure high quality software

• Implemented new features and enhancements to improve...read more
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Q2. Willing to join Arista ?
Ans. 
Yes, I am willing to join Arista as a Software Engineer.
• I am excited about the opportunity to work at Arista and contribute to their innovative projects.

• I have researched the company and believe that my skills align well with their values and goals.

• I am confident that I can make a positive impact on the team and help drive success at Arista.
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One Hr interview with 3-4 coding questions on strings,array and linked list

Question from Strings and Question from Linked Lists

Q1. What are double pointers ?
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Q2. Discuss OOPS in Programming.
Ans. 
OOPS stands for Object-Oriented Programming, a programming paradigm based on the concept of objects.
• OOPS focuses on creating objects that contain both data and methods to manipulate that data.

• Encapsulation, inheritance, and polymorphism are key principles of OOPS.

• Example: Inheritance allows a class to inherit properties and methods from another class, promoting code reusability.
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Q1. You Have a Data Stream and integers are coming at each second you have to identify the erroneous values.
Ans. 
Identify erroneous values in a data stream of integers received every second.
• Define what constitutes an erroneous value (e.g., out of range, duplicates).

• Use a sliding window to analyze recent values for anomalies.

• Implement statistical methods (mean, standard deviation) to detect outliers.

• Example: If values are expected to be between 1-100, flag 150 as erroneous.

• Consider using machine learning models for more complex pa...read more
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