01
What is TestNG and why is it used with Selenium?
Show answer
A test framework offering annotations, grouping, prioritisation, parallel runs, data providers and reports, which structure and scale Selenium tests.
Quantiphi Automation Testing Interview Questions & Answers
Curated interview practice questions with answers. These are practice scenarios, not a verified list of past interview questions.
About Quantiphi hiring for Automation Testing roles
Quantiphi is an AI-first digital engineering company that builds machine learning, data engineering, cloud and applied AI solutions for enterprises. It is known for close partnerships with major cloud providers and works with clients in healthcare, banking, media and retail. In India it hires machine learning engineers, data engineers, cloud engineers and software developers for global projects.
For Automation Testing roles, this Quantiphi practice set focuses most on TestNG Framework (8), Selenium WebDriver (8), Core Java for Testers (4), Selenium Grid & Docker (4). It has 7 easy, 26 medium, 7 hard questions, so you can start easy and work up to the harder ones.
- Company type
- Analytics
- Headquarters
- Marlborough, Massachusetts, USA
- Main India offices
- Mumbai, Bengaluru
Quantiphi Automation Testing interview process
- Online assessment (aptitude + coding + ML basics)
- Technical interview 1
- Technical interview 2
- HR round
Typical pattern based on public candidate experiences. Rounds vary by role, team and year.
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02
Write Appium code to scroll to an element by its text using UiScrollable on Android.
Show answer
// Scrolls the first scrollable container until the text is visible
String selector = "new UiScrollable(new UiSelector().scrollable(true))"
+ ".scrollIntoView(new UiSelector().text(\"Order History\"))";
WebElement item = driver.findElement(AppiumBy.androidUIAutomator(selector));
item.click();
03
How do you integrate Selenium tests with Jenkins?
Show answer
Create a job or pipeline that checks out code, runs mvn test, publishes reports and triggers on commits or schedules.
04
How do you make WebDriver thread-safe for parallel runs?
Show answer
Store each driver in a ThreadLocal so every thread gets its own instance and tests do not interfere.
05
What is a .gitignore file and what should an automation project ignore?
Show answer
A .gitignore lists files Git should not track. In a Java automation project ignore target/, test-output/, allure-results/, reports, screenshots, logs, IDE folders like .idea and .vscode, *.iml, OS files like .DS_Store, and local config files holding secrets. Ignoring generated output keeps the repository small and avoids noisy diffs and conflicts.
06
What is ITestContext in TestNG and how can you use it to share data?
Show answer
ITestContext represents one test tag from testng.xml and is passed to listeners and configuration methods. It holds the suite, included methods and results, and has setAttribute and getAttribute to share values, such as an auth token created in @BeforeTest and read by later classes. Because it is shared by every thread in that test tag, store only thread-safe or read-only data there, not WebDriver instances during parallel runs.
07
A click works locally but throws ElementClickInterceptedException in CI. How do you fix it?
Show answer
Another element, such as a cookie banner, loader overlay or sticky header, covers the target. In CI the window is often smaller, so the layout differs. Set a fixed window size, wait for the overlay to disappear with invisibilityOfElementLocated, close banners in setup and scroll the element into view. Use a JavaScript click only as a last resort, since it bypasses real user behaviour.
08
A mobile test fails intermittently because an animation is still running when you tap. How do you fix it?
Show answer
Wait for a stable end state instead of sleeping, for example wait until the target element is visible and enabled or until a spinner disappears. On test devices and emulators you can disable animations with adb shell settings put global window_animation_scale 0, along with the transition and animator scales. Ask developers for an idle indicator if needed. Disabling animations makes tests faster and more stable, but keep one manual check of the real animations.
09
How do you attach a screenshot to the Cucumber report when a scenario fails?
Show answer
@After
public void afterScenario(Scenario scenario) {
if (scenario.isFailed()) {
byte[] shot = ((TakesScreenshot) driver)
.getScreenshotAs(OutputType.BYTES);
scenario.attach(shot, "image/png", scenario.getName());
}
driver.quit();
}
10
Write the command to run a JMeter test in non-GUI mode and generate the HTML report.
Show answer
# -n non-GUI, -t test plan, -l results file, -e -o HTML dashboard folder
jmeter -n -t tests/checkout.jmx \
-l results/checkout.jtl \
-e -o results/html-report \
-Jusers=100 -Jrampup=60 -Jduration=600
# generate a report later from an existing JTL
jmeter -g results/checkout.jtl -o results/html-report-2
11
Your price comparison test fails because 19.99 + 0.01 is not equal to 20.0. Why?
Show answer
double uses binary floating point, which cannot represent many decimal values exactly, so small rounding errors appear. For money, use BigDecimal created from strings and compare with compareTo(), or compare doubles with a tolerance such as Assert.assertEquals(actual, expected, 0.001). Also strip currency symbols and commas before parsing UI text.
12
Write Selenium code to verify that all links on a page are not broken.
Show answer
List<WebElement> links = driver.findElements(By.tagName("a"));
for (WebElement link : links) {
String url = link.getAttribute("href");
if (url == null || !url.startsWith("http")) continue;
HttpURLConnection con = (HttpURLConnection) new URL(url).openConnection();
con.setRequestMethod("HEAD");
int code = con.getResponseCode();
if (code >= 400) System.out.println("Broken: " + url + " " + code);
}
13
How do you handle iframes?
Show answer
switchTo().frame(index, name or element) enters the frame, and switchTo().defaultContent() returns to the main page.
14
Describe a situation where automation was not the right answer.
Show answer
Situation: a manager wanted a one-time data migration check automated in Selenium. Task: give an honest recommendation. Action: I estimated the UI automation effort, showed a SQL comparison plus a manual sample check would finish in a day, and explained the flows would not repeat. Result: we finished faster, and the team now asks for ROI reasoning before automating.
15
Tell me about a time you reduced the run time of a test suite significantly.
Show answer
Situation: our TestNG regression took three hours, so it only ran nightly. Task: get it under forty minutes to run on every merge. Action: I profiled slow tests, replaced UI login with an API token, made the driver ThreadLocal and enabled parallel classes, moved data setup to APIs and removed duplicate tests. Result: the suite ran in thirty-five minutes on four threads, and defects were caught on the same day they were introduced.
16
Parallel TestNG runs open browsers that interact with each other's tests. How do you fix it?
Show answer
The WebDriver is shared, probably through a static field. Replace it with a ThreadLocal<WebDriver> in a DriverManager, create the driver in @BeforeMethod and call quit() and remove() in @AfterMethod(alwaysRun = true). Make page objects take the driver from the current thread. Also check test data, reports and loggers are thread-safe.
17
What is a webhook and how do you test it?
Show answer
A callback where one system sends an HTTP request to another when an event occurs. Test with a mock receiver or tools such as webhook.site and verify the payload.
18
What new features came with Selenium 4?
Show answer
Relative locators, improved Grid, W3C compliance, new window or tab creation, Chrome DevTools Protocol access and element-level screenshots.
19
What is the difference between @Test(priority) and dependsOnMethods in TestNG?
Show answer
priority only orders tests; a lower number runs first, and a failed test does not stop the others. dependsOnMethods creates a real dependency: if the parent test fails, dependent tests are skipped. Both make tests order-dependent, which hurts parallel runs and isolation, so use them sparingly. Prefer independent tests with their own setup.
20
Write a JSR223 Groovy PostProcessor that reads a JSON response and stores a value as a JMeter variable.
Show answer
// JSR223 PostProcessor, language: groovy
import groovy.json.JsonSlurper
def body = prev.getResponseDataAsString()
def json = new JsonSlurper().parseText(body)
if (json?.orderId) {
vars.put('orderId', json.orderId.toString())
} else {
prev.setSuccessful(false)
prev.setResponseMessage('orderId missing in response')
}
21
How do you increase the number of Chrome nodes with Docker Compose?
Show answer
Use the scale option: docker compose up -d --scale chrome=4 starts four Chrome node containers from the same service definition, and each registers with the hub. Do not fix container names or host ports on a scaled service, or the extra containers will clash. Check the Grid UI on port 4444 to confirm the slots. Make sure the host has enough CPU and memory, roughly one CPU core and 1 to 2 GB per browser.
22
What is the timeOut attribute in TestNG?
Show answer
@Test(timeOut = 5000) fails the test if it runs longer than 5000 milliseconds. It can also be set at suite or test level in testng.xml. It protects pipelines from hanging tests, for example a stuck network call. It is not a performance test; use reasonable limits so slow but correct environments do not cause false failures.
23
Write a Dockerfile that runs a Maven and TestNG test suite.
Show answer
FROM maven:3.9-eclipse-temurin-21
WORKDIR /app
# cache dependencies first for faster rebuilds
COPY pom.xml .
RUN mvn -q dependency:go-offline
COPY src ./src
COPY testng.xml .
ENV GRID_URL=http://selenium-hub:4444
CMD ["sh", "-c", "mvn test -Dgrid.url=$GRID_URL -Dsurefire.suiteXmlFiles=testng.xml"]
24
Your team has 600 Cucumber scenarios and step definitions have become a mess of duplicates. What do you do?
Show answer
First run a report of step usage to find duplicate and unused steps. Agree a step vocabulary per domain, merge near-identical steps using parameters, and delete unused ones. Move logic out of steps into page objects and service helpers. Add a review checklist and a dryRun gate in CI. Do this incrementally by feature area so the suite keeps running while you clean up.
25
A dropdown option list loads only after typing three letters. How do you automate selecting a value?
Show answer
Type the text with sendKeys, wait for the suggestion list with visibilityOfAllElementsLocatedBy, then find the option whose text matches the required value and click it. Avoid selecting by index because suggestion order may change. If the list is virtualised, type more characters to narrow results. Verify the selected value in the input afterwards.
26
What is the difference between Comparable and Comparator in Java?
Show answer
Comparable defines the natural order inside the class (compareTo); Comparator defines custom orders externally (compare), useful for sorting test data in several ways.
27
How do you verify that an element is displayed, enabled or selected?
Show answer
Use isDisplayed(), isEnabled() and isSelected() on the WebElement before interacting or asserting.
28
How do you read data from Excel or properties files in Java?
Show answer
Use Apache POI for Excel and the Properties class for config files, loaded in a utility class so tests read data instead of hard-coding it.
29
How do you upload a file with REST Assured?
Show answer
Use multipart: given().multiPart("file", new File("src/test/resources/report.pdf"), "application/pdf").formParam("type", "invoice").when().post("/upload").then().statusCode(200). REST Assured sets the multipart/form-data content type automatically. Verify both the status and the response, such as the returned file id or size, and test edge cases like empty, oversized and wrong-type files.
30
What is BDD and how does Cucumber work?
Show answer
Behaviour-driven development writes scenarios in Given-When-Then Gherkin that map to step definitions in code, so business and QA share one language.
31
What are the main OOP concepts in Java?
Show answer
Encapsulation, inheritance, polymorphism and abstraction. Testers use them to build reusable page classes, base tests and utility libraries.
32
How do you verify response time and headers in REST Assured?
Show answer
Use then().time(lessThan(2000L)) and then().header("Content-Type", containsString("json")) along with body assertions.
33
How do you watch a test running inside a Docker Selenium container?
Show answer
The selenium node and standalone images include a VNC server and noVNC. Expose port 7900 and open http://localhost:7900 in a browser; the default password is secret, or set SE_VNC_NO_PASSWORD to skip it. You can also open the Grid UI on port 4444 and click the session's video icon. This is very useful for debugging tests that fail only inside the container, such as layout or focus problems.
34
How do you retry failed tests in TestNG?
Show answer
Implement IRetryAnalyzer with a retry count and attach it through the test annotation or a listener to rerun flaky tests.
35
What is the Hybrid framework?
Show answer
A framework combining data-driven, keyword-driven and POM approaches with reporting and utilities, giving flexibility and reuse.
36
A file download test passes locally but fails in a Grid node. How do you approach it?
Show answer
The file is saved on the remote node, not the machine running the test, so the test cannot find it locally. Options are enabling Selenium Grid's managed downloads with se:downloadsEnabled and fetching the file through the Grid API, sharing a mounted volume with the container, or verifying the download by requesting the file URL with an HTTP client and checking status, size and type.
37
What is the New Session Queue in Selenium Grid 4 and what happens when all slots are busy?
Show answer
When a test requests a session and no node slot matches, the request waits in the New Session Queue instead of failing immediately. The distributor picks it up when a matching slot frees. If it waits longer than the session request timeout, which is 300 seconds by default, the client gets a SessionNotCreatedException. Tuning this timeout and matching thread count to slot count prevents long waits and timeouts in CI.
38
How would you design a CI pipeline for nightly regression?
Show answer
Schedule the job, spin up environments or containers, run suites in parallel, store reports and screenshots, notify failures on Slack or email and track trends.
39
How do you run the same test with data from Excel using a DataProvider?
Show answer
Write a utility that reads the sheet with Apache POI and returns Object[][] with one row per test case. Create a @DataProvider method that calls the utility, and set dataProvider = "loginData" on the test. Each row runs as a separate test with its own result. Keep the file in src/test/resources and consider CSV or JSON, which are easier to review in Git.
40
How do you handle authentication types in REST Assured?
Show answer
Basic auth uses auth().preemptive().basic(user, pass). Bearer tokens are set as a header: header("Authorization", "Bearer " + token). OAuth 2.0 can use auth().oauth2(token) after fetching the token from the token endpoint. API keys go in a header or query param. Fetch tokens once per suite or cache them with an expiry check rather than logging in before every test.
Tips to crack the Quantiphi Automation Testing interview
- Revise machine learning fundamentals such as regression, classification, evaluation metrics and overfitting, with clear intuitive explanations.
- Get hands-on with at least one cloud platform and mention any cloud certifications, since much client work runs on cloud services.
- Prepare a deep explanation of one ML or data project, including dataset, model choice, results and deployment approach.
- Keep a one-minute story ready for every project on your CV: problem, your part, tools, result.
- Practise the hard questions on this page aloud; Quantiphi interviewers usually ask follow-ups on your first answer.
Frequently asked questions
How many rounds are there in the Quantiphi Automation Testing interview?
Candidates usually go through 4 stages: Online assessment (aptitude + coding + ML basics); Technical interview 1; Technical interview 2; HR round. The exact rounds change with the role, team, location and your experience, so confirm the process with the recruiter.
Which topics should I prepare for the Quantiphi Automation Testing interview?
This practice set leans on TestNG Framework (8), Selenium WebDriver (8), Core Java for Testers (4), Selenium Grid & Docker (4). Revise those first, then practise explaining one or two of your own projects end to end, because most Quantiphi interviewers ask you to walk through real work.
Are these the exact questions asked at Quantiphi?
No. These are curated practice questions that match the skills and difficulty usually tested in analytics interviews like Quantiphi's. They are not a leaked or verified list of past questions.
Where does Quantiphi hire Automation Testing professionals in India?
Quantiphi has large teams in Mumbai, Bengaluru. Openings and locations change often, so check the Quantiphi careers page and filter by city and experience.
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