Twilio Interview Questions (11+ Questions)

We have two branches, main and feature settings, and we have a file config json that is located in the feature branch. We need to copy this file into the main branch. We don't need to cherry pick the commit. Cherry pick and copying one single file is different. Cherry picking adds specific commit from another branch to the branch that we are in currently. When we need to copy the file, we need to check out, but we need to check out specific file. GI Checkout, and we type the name of the branch and then Hyen and name of the file that we would like to check out. Now if we run Git status, we'll see this file as modified in our directory.

Securely inject database credentials as environment variables using Kubernetes Secrets. Create db-secret Secret with password=myPass123 key, expose as DB_PASSWORD environment variable in db-pod using busybox:latest. This hands-on task demonstrates Secret environment variable injection, credential management, secure configuration, and 12-factor app secrets handling. Perfect for microservices authentication, database connectivity, credential rotation, and zero-trust configuration practices.

Scrape meta tags from multiple web pages by reading URLs from a file, extracting all meta tag name-content pairs, and compiling the data into a structured JSON dataset using Python and BeautifulSoup.

def max_sub_array(nums: list[int]) -> int:
max_sum = nums[0]
current_sum = 0

for n in nums:
    if current_sum < 0:
        current_sum = 0
    current_sum += n
    max_sum = max(max_sum, current_sum)
    
return max_sum

We need to combine customer orders and products. Snowflake is mainly using the same concepts as in SQL. The only difference is that Snowflake is cloud-based. We are given three tables: customers, orders, and products. Our main goal here is to join all three tables together and return six unique columns. In Snowflake, we have to put the name of the table inside of the ref function, and everything has to be wrapped up in double curly braces. The reason behind is that Snowflake uses data build tool, which requires the ref function. Join connects two tables based on a common column. We are more interested in inner join because it returns only the rows where there is a match in both tables. We give aliases O to orders and C to customers table. Using on, we indicate which common columns were used to connect the tables. We use double pipe operator, or in other words, a concatenation sign, to get the full name.

Master complex multi-table aggregations in PySpark. Learn how to prevent Cartesian explosions by pre-aggregating DataFrames before joining, and practice calculating date intervals.

Master full outer joins in PySpark. Learn how to merge datasets while retaining all records from both tables, even when matching keys are missing, to build comprehensive engineering reports.

SELECT
ROUND(
SUM(
CASE
WHEN pi1.country_id != pi2.country_id THEN 1
ELSE 0
END
)::DECIMAL / COUNT(*) * 100,
1
) AS international_pct
FROM
phone_calls pc
JOIN phone_info pi1 ON pc.caller_id = pi1.caller_id
JOIN phone_info pi2 ON pc.receiver_id = pi2.caller_id;

WITH
monthly_long_calls AS (
SELECT
EXTRACT(
YEAR
FROM
call_date
)::INT AS YEAR,
EXTRACT(
MONTH
FROM
call_date
)::INT AS MONTH,
COUNT(*) AS long_call_count
FROM
phone_calls
WHERE
duration_secs > 300
GROUP BY
EXTRACT(
YEAR
FROM
call_date
),
EXTRACT(
MONTH
FROM
call_date
)
)
SELECT
YEAR,
MONTH,
ROUND(
(
long_call_count - LAG(long_call_count) OVER (
ORDER BY
YEAR,
MONTH
)
) * 100.0 / LAG(long_call_count) OVER (
ORDER BY
YEAR,
MONTH
),
1
) AS growth_pct
FROM
monthly_long_calls
ORDER BY
YEAR,
MONTH;

Master form element validation testing with Selenium. Learn dynamic input validation and comprehensive field state monitoring techniques....

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Master page transition validation testing with Selenium. Learn navigation detection and validation for medium-level automation....

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