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A/B Testing

How would you assess the validity of the result?

Experiment Validity

Button AB Test

How would you design a two-week A/B test to determine whether a pricing increase is a good business decision

Testing Price Increase

What would you expect to happen after the new UI is applied to all users?

New UI Effect

Precisely ascertain whether the outcomes of an A/B test, executed to assess the impact of a landing page redesign, exhibit statistical significance.

Statistically Significant Test

Behavioral

Describing a data project and its challenges

Hurdles In Data Projects

Making data-driven insights actionable for those without technical expertise

Simple Explanations

What do you tell an interviewer when they ask you what your strengths and weaknesses are?

Your Strengths and Weaknesses

AI & Agentic Systems

Design a query-retrieval system for an analytics platform

Design a query-retrieval system

Data Structures & Algorithms

Find the minimum number of days required to schedule all meetings without any conflicts.

Minimum Days for Scheduling All Meetings

Machine Learning

What is the difference between Logistic and Linear Regression?

Linear vs Logistic Regression

Let’s say that your company is running a standard control and variant AB test on a feature to increase conversion rates on the landing page. The PM checks the results and finds a .04 p-value.

How would you assess the validity of the result?

A team wants to A/B test multiple different changes through a sign-up funnel.

For example, on a page, a button is currently red and at the top of the page. They want to see if changing a button from red to blue and/or from the top of the page to the bottom of the page will increase click-through.

How would you set up this test?

Your team wants to run an AB test on the color (red or blue) and position (top/bottom of the page) of a button that links to a promotion.

How many different variants of the test should you run to see the effect that a red button has on the bottom of the page, if currently the button is blue and on the top of the page.

Your team wants to run an AB test on the color (red or blue) and position (top/bottom of the page) of a button that links to a promotion.

How many different variants of the test should you run to see the effect that a red button has on the bottom of the page, if currently the button is blue and on the top of the page.

A/B Test Variants

Tell me about a data project that didn’t go the way you expected. What did you set out to do, what surprised you, and how did you handle it?

Let’s say that you work at a B2B SAAS company that’s interested in testing the pricing of different levels of subscriptions.

Your project manager comes to you and asks you to run a two-week-long A/B test to test an increase in pricing.

How would you approach designing this test? How would you determine whether the increase in pricing is a good business decision?

Let’s say we’re testing a new UI with the goal to increase conversion rates. We test it by giving the new UI to a random subset of users.

The test variant wins by 5% on the target metric. What would you expect to happen after the new UI is applied to all users? Will the metric actually go up by ~5%, more, or less?

Note: Assume there is no novelty effect.

You are working on a Snowflake-like analytics platform that stores query history for enterprise customers. Product managers want a feature that lets users search past queries by text, filter by metadata, and retrieve the most relevant results quickly.

Design a query-retrieval system that supports the following requirements:

<ol>
<li>Users can search by keywords appearing in the SQL text, for example <code>join</code>, <code>customer_id</code>, or <code>date_trunc</code>.</li>
<li>Users can filter by <code>user_id</code>, <code>warehouse_name</code>, <code>start_time</code> and <code>end_time</code>, and <code>status</code> such as <code>SUCCESS</code>, <code>FAILED</code>, or <code>CANCELLED</code>.</li>
<li>Results should be ranked by relevance, with exact keyword matches ranked higher than partial matches.</li>
<li>The system should return the top <code>k</code> results, sorted by relevance and then by most recent execution time.</li>
<li>The system must scale to billions of query records and support low-latency search.</li>
</ol>

You are the office manager responsible for scheduling all meetings in a company. Each meeting has a start time and end time, represented as <code>[[start_1, end_1], [start_2, end_2], …]</code>.

Your goal is to find the minimum number of days needed to schedule all meetings without conflicts.

Note: If a meeting ends at the same time another starts, it does not count as a conflict: (2026-12-01 08:00, 2026-12-01 10:00),(2026-12-01 10:00, 2026-12-01 12:00) is not considered a conflict at 10:00.

<h3>Example 1</h3>

Input:

<pre tabindex="0" class="chroma"><code>meetings = [[&#34;2026-12-01 09:00&#34;, &#34;2026-12-01 17:00&#34;], 
 [&#34;2026-12-01 10:00&#34;, &#34;2026-12-01 11:00&#34;], 
 [&#34;2026-12-01 13:00&#34;, &#34;2026-12-01 14:00&#34;]]
</code></pre>

Output:

<pre tabindex="0" class="chroma"><code>def min_days(meetings) -&gt; 2
</code></pre>

Explanation:

<pre tabindex="0" class="chroma"><code>Day 1: [&#34;2026-12-01 09:00&#34;, &#34;2026-12-01 17:00&#34;]
Day 2: [&#34;2026-12-01 10:00&#34;, &#34;2026-12-01 11:00&#34;], [&#34;2026-12-01 13:00&#34;, &#34;2026-12-01 14:00&#34;]
</code></pre>

Since one of the meetings takes the entire working day (from 9 AM to 5 PM), the other needs to be rescheduled to another day; therefore, the answer is 2.

How would you convey insights and the methods you use to a non-technical audience?

When an interviewer asks a question along the lines of:

<ul>
<li>What would your current manager say about you? What constructive criticisms might he give?</li>
<li>What are your three biggest strengths and weaknesses you have identified in yourself?</li>
</ul>

How would you respond?

When asked about your strengths in an interview, what is an effective way to respond?

When asked about your strengths in an interview, what is an effective way to respond?

Your Strengths and Weaknesses I

Which of the following is an acceptable strategy when discussing weaknesses in an interview?

Which of the following is an acceptable strategy when discussing weaknesses in an interview?

Your Strengths and Weaknesses II

Let’s say we want to launch a re-design of a landing page to improve the click-through rate. We can do this by implementing an AB test.
Given that we launch an AB test, how would you infer if the results of the click-through rate were statistically significant or not?

How can you accurately conclude if the results of an A/B test, conducted to evaluate the effectiveness of a landing page redesign, are statistically significant?

How can you accurately conclude if the results of an A/B test, conducted to evaluate the effectiveness of a landing page redesign, are statistically significant?

What is the difference between Logistic and Linear Regression?

When would use one instead of the other in practice?

Calculate Moving Average	SQL	Easy
Predict Customer Churn	Machine Learning	Medium
A/B Test Significance	Statistics	Medium
Optimize Query Performance	SQL	Hard
Feature Importance Analysis	Machine Learning	Medium
Clean Missing Data	Python	Easy
Neural Network Architecture	Deep Learning	Hard
Calculate Cohort Retention	SQL	Medium
Bayesian Probability	Statistics	Easy
Recommend Similar Products	Machine Learning	Hard

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