EPAM Systems Interview Questions and Answers

Programs to check palindrome and output for multiple inheritance and method overriding

• Palindrome program can be implemented using string or integer reversal and comparison

• Output for multiple inheritance program depends on the specific implementation

• Output for method overriding program depends on the specific implementation

Abstraction and encapsulation are OOPS concepts. Achieving abstraction in Python is through abstract classes and interfaces. Private and protected access specifiers restrict access to class members.

• Abstraction is the process of hiding implementation details and showing only the necessary information to the user.

• Encapsulation is the process of wrapping data and methods into a single unit and restricting access to them f...read more

Questions on Python concepts - generators, iterators, lambda functions, lists, and tuples.

• Generators are functions that return an iterator and can be paused and resumed. They save memory and improve performance.

• Iterators are objects that can be iterated upon and return data one at a time. They are less memory-efficient than generators.

• Lambda functions are anonymous functions that can take any number of arguments and re...read more

Explaining implicit and explicit waits, handling multiple windows and exceptions in Selenium

• Implicit wait: Wait for a certain amount of time before throwing an exception if the element is not found

• Explicit wait: Wait for a certain condition to be met before proceeding with the next step

• XPath example: //input[@id='username']

• Exceptions in Selenium: NoSuchElementException, TimeoutException, ElementNotVisibleException, Sta...read more

To post a request in API automation, we use tools like Postman or RestAssured. Authentication is performed using tokens or API keys. Page Object Model is a design pattern used in automation testing.

• To post a request, we need to specify the endpoint URL, request method, headers, and body parameters.

• We can use tools like Postman or RestAssured to post requests and get responses.

• Authentication can be performed using token...read more

Answers to questions related to pytest and robotframework

• Fixtures in pytest are functions that provide a fixed baseline for tests to run on

• Markers in pytest are used to mark tests with metadata such as priority or category

• Robotframework architecture consists of test libraries, test cases, and keywords

• Test cases in robotframework are written in a tabular format using keywords and arguments

• Reports in robotframework can b...read more

Questions related to Git, software model, Docker, and CI/CD for Senior QA Automation Engineer position.

• get fetch retrieves changes from the remote repository without merging them into the local branch

• git pull retrieves changes from the remote repository and merges them into the local branch

• git stash temporarily saves changes that are not ready to be committed

• git rebase integrates changes from one branch into another by...read more

SQL query to find the 2nd highest rated movie and explanation of joins and self join.

• To find the 2nd highest rated movie, use the following SQL query: SELECT TOP 1 rating FROM (SELECT DISTINCT TOP 2 rating FROM movies ORDER BY rating DESC) ORDER BY rating ASC

• Joins are used to combine data from two or more tables based on a related column.

• Inner join returns only the matching rows from both tables, while outer join retur...read more

To give all rwx permissions to a file, use chmod 777 filename. To search for specific text in a file, use grep 'text' filename.

• To give all rwx permissions to a file, use the chmod command followed by 777 and the filename.

• Example: chmod 777 myfile.txt

• To search for specific text in a file, use the grep command followed by the text and the filename.

• Example: grep 'hello' myfile.txt

Smoke testing, sanity testing and regression testing are types of software testing. Bug life cycle is the process of a bug from discovery to resolution. Traceability matrix is a document that links requirements to test cases.

• Smoke testing is a quick test to check if the basic functionalities of the software are working after a new build.

• Sanity testing is a quick test to check if the major functionalities of the softwar...read more

Testing is the process of identifying defects while quality assurance is the process of preventing defects.

• Testing is a reactive process while quality assurance is a proactive process.

• Testing is focused on finding defects while quality assurance is focused on preventing defects.

• Testing is a subset of quality assurance.

• Quality assurance involves the entire software development process while testing is limited to the tes...read more

Smoke testing is a quick and shallow test to ensure the basic functionality of an application. Regression testing is a comprehensive test to ensure that changes made to the application do not affect its existing functionality.

• Smoke testing is performed after a new build is received and before regression testing.

• Smoke testing is a subset of regression testing.

• Regression testing is performed after changes are made to the...read more

CI/CD is a software development approach that emphasizes continuous integration, testing, and delivery.

• CI/CD stands for Continuous Integration/Continuous Delivery

• It involves automating the software development process to ensure that code changes are frequently and consistently tested and deployed

• Xtreme Programming (XP) is an Agile software development methodology that emphasizes teamwork, communication, and feedback

• Kan...read more

As a Senior QA Automation Engineer, I have faced various challenges and have successfully resolved them.

• One challenge I faced was ensuring compatibility across different browsers and devices. I resolved this by implementing a robust cross-browser testing strategy using tools like Selenium Grid and BrowserStack.

• Another challenge was dealing with complex test scenarios and data dependencies. To overcome this, I developed...read more

I have learned the importance of thorough testing, communication, and continuous improvement from my failures.

• Thorough testing: I have learned that skipping or rushing through testing can lead to overlooked bugs and issues.

• Communication: I have learned the importance of clear and effective communication with team members and stakeholders to ensure everyone is on the same page and expectations are aligned.

• Continuous imp...read more

I am seeking new challenges and opportunities for growth in my career.

• Looking for a more challenging role

• Seeking opportunities for professional development

• Wanting to work with new technologies or tools

• Desire for a better work-life balance

• Seeking a more supportive or collaborative work environment

I am looking for the role of Senior QA Automation Engineer and my expectations from EPAM are...

• I am looking for a challenging role where I can utilize my skills and experience in QA automation

• I expect EPAM to provide a supportive and collaborative work environment

• I hope to work on cutting-edge technologies and projects

• I am looking for opportunities for professional growth and advancement

• I expect EPAM to value work-life...read more

My current day-to-day tasks involve designing and implementing data pipelines, optimizing data storage and retrieval, and collaborating with cross-functional teams.

• Designing and implementing data pipelines to extract, transform, and load data from various sources

• Optimizing data storage and retrieval processes for efficiency and scalability

• Collaborating with cross-functional teams to understand data requirements and del...read more

The end-to-end project architecture involves designing and implementing the entire data pipeline from data ingestion to data visualization.

• Data ingestion: Collecting data from various sources such as databases, APIs, and files.

• Data processing: Cleaning, transforming, and aggregating the data using tools like Apache Spark or Hadoop.

• Data storage: Storing the processed data in data warehouses or data lakes like Amazon S3 ...read more

Use Spark (Databricks) notebooks to migrate 1000s of tables efficiently.

• Utilize Spark's parallel processing capabilities to handle large volumes of data

• Leverage Databricks notebooks for interactive data exploration and transformation

• Automate the migration process using scripts or workflows

• Optimize performance by tuning Spark configurations and cluster settings

Understanding SQL joins is crucial for data retrieval and analysis in relational databases.

• INNER JOIN: Returns records with matching values in both tables. Example: SELECT * FROM A INNER JOIN B ON A.id = B.id.

• LEFT JOIN: Returns all records from the left table and matched records from the right table. Example: SELECT * FROM A LEFT JOIN B ON A.id = B.id.

• RIGHT JOIN: Returns all records from the right table and matched rec...read more

Seeking new challenges and opportunities for growth in a more dynamic environment.

• Desire for new challenges and learning opportunities

• Seeking a more dynamic work environment

• Looking to expand skill set and experience

• Interested in working on cutting-edge technologies

• Seeking better career advancement prospects

I expect EPAM to provide challenging projects, opportunities for growth, a collaborative work environment, and support for continuous learning.

• Challenging projects that allow me to utilize my skills and knowledge

• Opportunities for professional growth and advancement within the company

• A collaborative work environment where teamwork is valued

• Support for continuous learning through training programs and resources

Yes, I am willing to relocate for the right opportunity. I can join the company within 4 weeks.

• Willing to relocate for the right opportunity

• Can join within 4 weeks

• Open to discussing relocation assistance if needed

The code demonstrates exception handling, resulting in an output of 2 due to incrementing variable I in catch and finally blocks.

• The code throws a NullPointerException which is caught in the catch block.

• In the catch block, I is incremented from 0 to 1.

• The finally block executes regardless of exception, incrementing I from 1 to 2.

• The final output printed is the value of I, which is 2.

Identify and print duplicate names from a string array that start with 'B'.

• 1. Create a string array with names, e.g., ['Bob', 'Alice', 'Bill', 'Bob', 'Bobby'].

• 2. Use a HashMap or dictionary to count occurrences of each name.

• 3. Iterate through the array and check for names starting with 'B'.

• 4. Print names that have a count greater than 1, e.g., 'Bob' and 'Bill' if they are duplicates.

TestNG annotations are used to define test methods, configuration, and grouping in automated testing.

• @Test: Marks a method as a test method. Example: @Test public void testMethod() {}

• @BeforeSuite: Executes before the entire test suite. Example: @BeforeSuite public void setupSuite() {}

• @AfterSuite: Executes after the entire test suite. Example: @AfterSuite public void teardownSuite() {}

• @BeforeTest: Executes before any te...read more

In a runner class, tags help organize and filter test cases for execution in automation testing frameworks.

• Tags are used to categorize tests, e.g., @smoke, @regression.

• They allow selective execution, e.g., running only @smoke tests.

• Tags can be combined, e.g., @regression and @critical.

• In Cucumber, tags are specified in the feature file, e.g., @login.

• In TestNG, tags can be implemented using groups in XML configuration.

Regression testing checks existing features after changes, while smoke testing verifies basic functionality post-deployment.

• Regression testing ensures that new code changes do not adversely affect existing functionalities.

• Smoke testing is a preliminary test to check if the basic functions of an application work.

• Example of regression testing: After a new feature is added, testing all existing features to ensure they sti...read more

Custom exceptions enhance error handling in automation testing, while StaleElementReferenceException indicates a DOM element is no longer valid.

• Custom Exceptions: These are user-defined exceptions that allow developers to create specific error handling scenarios tailored to their application needs.

• Common Exceptions: In automation testing, I've encountered exceptions like NoSuchElementException, TimeoutException, and St...read more

Waits in automation testing manage timing issues between code execution and web element availability.

• Implicit Wait: Sets a default wait time for the entire session. Example: driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);

• Explicit Wait: Waits for a specific condition to occur before proceeding. Example: WebDriverWait wait = new WebDriverWait(driver, 10);

• Fluent Wait: Similar to explicit wait but allows p...read more

BDD is a software development approach that enhances collaboration between developers, testers, and non-technical stakeholders.

• Originated from Test Driven Development (TDD) to improve communication.

• Focuses on defining behavior in simple language, often using Gherkin syntax.

• Encourages collaboration through examples and scenarios, e.g., 'Given a user is logged in, when they click logout, then they should see the login pa...read more