Blue Dart Express Software Developer Interview Questions and Answers

Q1. Whats difference between patch and put
Ans. 
Patch is used to update a specific part of a resource, while put is used to replace the entire resource.
• Patch is used for partial updates, while put is used for full updates.

• Patch is idempotent, meaning multiple identical patch requests will have the same effect as a single request, while put is not necessarily idempotent.

• Example: Using patch to update the title of a blog post without affecting other fields, while usin...read more
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Q1. DSA ROUND - DP problem
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Dynamic Programming problem involving finding the maximum sum of non-adjacent elements in an array.
• Use dynamic programming to keep track of the maximum sum at each index.

• At each index, the maximum sum is either the current element plus the sum two indices back, or the sum at the previous index.

• Example: For array [2, 4, 6, 2, 5], the maximum sum of non-adjacent elements is 13 (2 + 6 + 5).
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Q2. DSA ROUND - STRING PROBLEM
Ans. 
Find the longest common prefix among an array of strings.
• Iterate through the characters of the first string and compare with other strings

• Return the prefix when characters don't match or reach end of any string

• Example: Input - ['flower', 'flow', 'flight'], Output - 'fl'
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Q1. PROJECT RELATED QUESTIONS
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Q2. DESIGN LRU CACHE
Ans. 
LRU cache is a data structure that stores the most recently used items.
• Use a doubly linked list to keep track of the order of items based on their usage.

• Use a hashmap to quickly access items in the cache.

• When a new item is accessed, move it to the front of the linked list.

• If the cache is full, remove the least recently used item from the end of the linked list.
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Q1. What is the concept of oops
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OOPs (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.
• OOPs focuses on creating objects that interact with each other to solve problems

• Key concepts include encapsulation, inheritance, and polymorphism

• Encapsulation allows data to be hidden within an object and only accessed through methods

• Inheritance allows a class to inherit properties and methods f...read more
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Q1. Tell what is your name
Ans. 
My name is John Smith.
• Full name is John Smith

• Common name in English-speaking countries

• No middle name or initial
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Q2. What do you do in free time
Ans. 
In my free time, I enjoy hiking, playing video games, and learning new programming languages.
• Hiking in local trails and national parks

• Playing video games like Overwatch and Minecraft

• Learning new programming languages like Python and JavaScript
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Q1. Core Java and SQL-related questions.
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Q1. What is your Previous job experience-related ?
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Q1. .net C#, Design pattern,Azure Angular ,
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Q2. Web Api, SQL Entity Framework
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Asked about schema for ecommerce and a coding question