EPAM Systems Interview Questions, Process, and Tips

Dsa,oops,seo,reactjs,node js

Q1. What is seo and how it was used
Ans. 
SEO stands for Search Engine Optimization, which is the practice of increasing the quantity and quality of traffic to your website through organic search engine results.
• SEO involves optimizing your website content, meta tags, and backlinks to improve its visibility on search engines like Google.

• Keywords play a crucial role in SEO, as they help search engines understand the relevance of your content to users' search que...read more
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Q2. What is event loop
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Event loop is a mechanism in programming that allows for asynchronous execution of code by continuously checking for and handling events.
• Event loop is commonly used in JavaScript to handle asynchronous operations.

• It allows for non-blocking I/O operations by delegating tasks to the operating system.

• Event loop continuously checks the event queue for new events and executes them in a sequential manner.

• Example: setTimeout ...read more
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Q1. What is difference between state object and state?
Ans. 
State object is a specific instance of a state, while state is a general concept representing the condition of a system.
• State object is a concrete representation of a state in a program, containing specific values and properties.

• State is an abstract concept that defines the overall condition or status of a system.

• In iOS development, state object could refer to an instance of a class representing the current state of a ...read more
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Q2. Lazy properties
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Q1. Java Coding( Hashmap based),Interfaces and Abstrct classes,OOPs concepts and their usage in framework,Java 8 features
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Q2. GIT PR Process,Jenkins,RestAssured basics
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Q1. Framework Design,Parallel Execution
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Q2. Internal working of Hashmaps,Singleton Design pattern
Ans. 
Hashmaps store key-value pairs using hashing for fast retrieval. Singleton pattern ensures only one instance of a class exists.
• Hashmaps use hashing to map keys to values for efficient retrieval

• Singleton pattern restricts a class to have only one instance and provides a global point of access to it

• Internal working of Hashmaps involves hashing the key to determine the index where the value is stored

• Singleton pattern can ...read more
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Q1. Salary negotiation
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Q2. Notice Period Discussion
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Q1. Touched all concepts of java, spring boot, microservices
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Q2. Writing code using java8
Ans. 
Using Java 8 features to write efficient and concise code.
• Utilize lambda expressions for functional programming

• Use streams for processing collections in a more declarative way

• Leverage default methods in interfaces for backward compatibility

• Explore the new Date and Time API for improved handling of dates and times
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Situational, what you will do if some certain situation happens

Q1. Details about company, and payslip discussion
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Q1. What is a functional interface?
Ans. 
A functional interface is an interface that contains only one abstract method and can be used as a lambda expression.
• Functional interfaces can have multiple default or static methods, but only one abstract method.

• Functional interfaces are used in lambda expressions to provide implementation for the abstract method.

• Examples of functional interfaces in Java include Runnable, Callable, and ActionListener.
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Q2. Types of locks ?
Ans. 
Types of locks include mutex locks, spin locks, read-write locks, and file locks.
• Mutex locks: used to protect shared resources by allowing only one thread to access the resource at a time.

• Spin locks: busy-waiting locks that repeatedly check for the lock to become available.

• Read-write locks: allow multiple readers or a single writer to access a resource.

• File locks: used to prevent multiple processes from simultaneously
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Q1. How can a server-side script be called from a UI action?
Ans. 
A server-side script can be called from a UI action by defining a script action in the UI action configuration.
• Define a script action in the UI action configuration with the appropriate server-side script function

• Use gs.eventQueue() to trigger the server-side script from the UI action

• Ensure proper permissions are set for the server-side script to be executed
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Q2. What is OAuth authentication?
Ans. 
OAuth authentication is a secure way to grant access to resources without sharing credentials.
• OAuth stands for Open Authorization

• It allows a user to grant a third-party application access to their resources without sharing their credentials

• OAuth uses tokens for authentication instead of passwords

• It is commonly used in APIs and web applications for secure authorization
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Q3. What are the different types of business rules?
Ans. 
Different types of business rules include client scripts, UI policies, data policies, and script includes.
• Client scripts are used to run on the client side to perform actions or validations.

• UI policies are used to set mandatory fields, read-only fields, or visibility conditions on forms.

• Data policies are used to enforce data consistency and integrity by defining rules on fields.

• Script includes are reusable scripts that...read more
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Q4. What is an example of an asynchronous business rule?
Ans. 
An asynchronous business rule is a rule that runs in the background without blocking the user interface.
• Asynchronous business rules are commonly used for long-running processes that do not require immediate user interaction.

• They can be used for tasks such as sending email notifications, updating records in bulk, or performing complex calculations.

• An example of an asynchronous business rule could be a rule that triggers...read more
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Q5. What are the methods to call a server-side script from a client-side script?
Ans. 
Methods to call a server-side script from a client-side script
• Using AJAX to make a server-side request

• Using REST API calls to interact with server-side scripts

• Using server-side events triggered by client-side actions

• Using server-side functions called from client-side scripts
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Q6. What are triggers in Flow Designer?
Ans. 
Triggers in Flow Designer are events that initiate a flow when a specified condition is met.
• Triggers are used to start a flow based on a specific event or condition

• They can be configured to listen for events like record creation, updates, or deletions

• Triggers can also be set to run on a schedule or at a specific time
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Q7. How can input be passed to a workflow activity?
Ans. 
Input can be passed to a workflow activity using input parameters.
• Define input parameters in the workflow activity

• Pass values to the input parameters when starting the workflow

• Access the input parameters within the workflow activity
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Q8. What is the procedure for sending a report with an attachment regarding an incident?
Ans. 
To send a report with an attachment regarding an incident, follow these steps.
• Navigate to the incident record in ServiceNow

• Click on the 'More Options' menu and select 'Create PDF'

• Attach the PDF report to the incident record

• Notify the relevant stakeholders about the attached report
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Q9. What are the different types of server-side scripts?
Ans. 
The different types of server-side scripts include Business Rules, Script Includes, UI Policies, and Client Scripts.
• Business Rules are used to define custom server-side logic that runs when a record is inserted, updated, or deleted.

• Script Includes are reusable scripts that can be called from other scripts or business rules.

• UI Policies are used to set mandatory or read-only fields on a form based on certain conditions.

• C...read more
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Q10. What is the difference between getXML, getXML wait, and GetXML answer?
Ans. 
getXML, getXMLWait, and getXMLAnswer are different methods in ServiceNow for handling XML data.
• getXML is used to retrieve XML data synchronously.

• getXMLWait is used to retrieve XML data asynchronously.

• getXMLAnswer is used to retrieve XML data and wait for a response.
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Q11. What are some examples of Glide system objects?
Ans. 
Glide system objects are used in ServiceNow to interact with the platform and perform various operations.
• GlideRecord

• GlideSystem

• GlideAggregate

• GlideForm

• GlideUser
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