Evolent Health International Software Developer Interview Questions and Answers

In first round 4 coding question like 1 dsa 2 database and one is api and question is very simple . coding round was conducted in hackerrank

Q1. DSA QUESTION LIKE TREE AND GRAPH
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Q2. DP AND SORTING APPROACH
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Again same but dsa question and oops concept in deep level

Q1. Rest Apis questions
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Q1. Core java and OOPS and LLD
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2 hours of duration and medium level leetcode questions

Q1. What do you mean by os?
Ans. 
OS stands for Operating System. It is a software that manages computer hardware and provides services for computer programs.
• OS is the software that acts as an intermediary between computer hardware and user applications.

• It manages computer resources such as memory, processors, devices, and file systems.

• Examples of popular operating systems include Windows, macOS, Linux, and Android.
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Q2. How can deadlock be avoided?
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Deadlock can be avoided by implementing proper resource allocation strategies and using techniques like deadlock prevention, avoidance, detection, and recovery.
• Implement proper resource allocation strategies such as resource ordering, wait-die, wound-wait, etc.

• Use techniques like deadlock prevention by ensuring that the system never enters a deadlock state, avoidance by ensuring that the system does not enter an unsafe...read more
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Q1. Diff var let const
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diff var let const
• var is function-scoped, let and const are block-scoped

• var can be redeclared and reassigned, let can be reassigned but not redeclared, const cannot be reassigned or redeclared

• const must be initialized during declaration, let and var can be declared without initialization
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Q1. Related to node js architecture
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Q1. Expectation and all
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Q1. They asked so many questions from it went well
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Q2. How was your experience
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General Aptitude Test

Q1. OOPS , Database Questions
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Q1. This round was also same as round 2
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Coding questions codility hacker ranl

Q1. What are the pillars of oops?
Ans. 
The pillars of OOP are encapsulation, inheritance, and polymorphism.
• Encapsulation: bundling of data and methods into a single unit

• Inheritance: ability to create new classes from existing ones

• Polymorphism: ability to use a single interface for multiple types
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Q2. Web api Security mechanism
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Web API security mechanisms protect against unauthorized access and ensure data integrity.
• Authentication: Verify the identity of the user or client accessing the API.

• Authorization: Determine what actions the authenticated user or client is allowed to perform.

• Encryption: Securely transmit data over the network using encryption algorithms.

• Input validation: Validate and sanitize user input to prevent common security vulne...read more
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Q3. Deadlock in Sql
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Deadlock in SQL occurs when two or more transactions permanently wait for each other to release resources.
• Deadlock happens when two or more transactions acquire locks on resources and wait for each other indefinitely.

• It can occur due to poor transaction scheduling, lock contention, or incorrect use of transactions.

• To prevent deadlock, use proper transaction isolation levels, minimize lock contention, and ensure transac...read more
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