EPAM Systems Interview Questions, Process, and Tips

Codility- Angular - 2 questions, complete code for html, ts files

Q1. SOLID principles
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Q2. Prototypes with examples, create a prototype that removes duplicate words from a sentence
Ans. 
Prototype to remove duplicate words from a sentence using an array of strings
• Create a function that takes in a sentence as input

• Split the sentence into an array of words

• Use a Set data structure to store unique words

• Iterate through the array of words and add each word to the Set

• Convert the Set back to an array to get the unique words

• Join the unique words back into a sentence
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Q3. Union types and intersection Types
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Q4. Utility types- Omit and Partial
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Q5. Angular Change Detection
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Q6. ZoneJS and Signals
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Q7. ViewChild and ViewChildren
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Q8. View Encapsulation
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Q9. Subject and Behaviour Subject
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Q10. Dynamic Component Loading
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Q11. MergeMap and SwitchMap
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Q12. Performance tuning in Angular
Ans. 
Performance tuning in Angular involves optimizing code, reducing load times, and improving user experience.
• Use lazy loading to load modules only when needed

• Minimize the number of HTTP requests by combining files and using caching

• Optimize change detection by using OnPush strategy

• Avoid unnecessary DOM manipulations and use trackBy function in ngFor loops

• Use AOT compilation to reduce bundle size and improve load times
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2 coding question (1st reverse a string without changing position of special character. 2nd remove elements before '#') + 20 mcqs

How to Improve software development process

Q1. Rearrange string
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Q2. Create form using react.js
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Q3. Longest prefix of strings in array
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Q1. Introduce your self
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Q2. Basic hr question
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Big data related multiple questions around 10 Multiple choice
One sql question to find the salary details medium difficulty
One python related question

Q1. All basic to complex questions related to spark and its architecture
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Q2. Big data and python questions and how to build new data source from sql server to data warehouse. Need to give detail tech stack and complete process information
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Q1. Stream api coding
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Q2. Interface vs abstract
Ans. 
Interface defines a contract for classes to implement, while abstract class provides partial implementation.
• Interface can have only abstract methods, while abstract class can have both abstract and concrete methods.

• A class can implement multiple interfaces but can only extend one abstract class.

• Interfaces are used for achieving multiple inheritance in Java.

• Abstract classes are used when some common functionality needs
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Q1. Microservices design pattern
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Microservices design pattern is an architectural style that structures an application as a collection of loosely coupled services.
• Each service is responsible for a specific function and can be developed, deployed, and scaled independently.

• Communication between services is typically done through APIs, allowing for flexibility and resilience.

• Microservices promote agility, scalability, and maintainability in large and com...read more
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Q2. Solid principal
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