The Duolingo Business Intelligence interview guide, interview questions, salary data, and interview experiences.

Duolingo Business Intelligence Interview Guide

<p>Getting ready for an Business Intelligence interview at Duolingo? The Duolingo Business Intelligence interview span across 10 to 12 different question topics. In preparing for the interview:</p>
<ul>
<li>Know what skills are necessary for Duolingo Business Intelligence roles.</li>
<li>Gain insights into the Business Intelligence interview process at Duolingo.</li>
<li>Practice real Duolingo Business Intelligence interview questions.</li>
</ul>
<p>Interview Query regularly analyzes interview experience data, and we've used that data to produce this guide, with sample interview questions and an overview of the Duolingo Business Intelligence interview.</p>


Getting ready for an Business Intelligence interview at Duolingo? The Duolingo Business Intelligence interview span across 10 to 12 different question topics. In preparing for the interview:

- Know what skills are necessary for Duolingo Business Intelligence roles.
- Gain insights into the Business Intelligence interview process at Duolingo.
- Practice real Duolingo Business Intelligence interview questions.

Interview Query regularly analyzes interview experience data, and we've used that data to produce this guide, with sample interview questions and an overview of the Duolingo Business Intelligence interview.
        

Overview

<p>We've gathered this data from parsing thousands of interview experiences sourced from members.</p>

We've gathered this data from parsing thousands of interview experiences sourced from members.

Duolingo Business Intelligence Interview Process

<p>Suppose your company needs to cut costs due to an economic downturn. During a coffee break, you hear a rumor that a lot of money goes to employees who don’t do their work, and you decide to find out if the rumor is true.</p>

<p>Given two tables: <code>employees</code> and <code>projects</code>, find the sum of the salaries of all the employees who didn’t complete any of their projects.</p>

<p>Clarification:</p>

<p>We will consider a project unfinished if it has no end date (its <code>End_dt</code> is <code>NULL</code>).</p>

<p>Given this, we’ll say an employee didn’t finish any of their projects when:</p>

<ul>
<li>They were assigned at least one project.</li>
<li>None of their projects have an <code>End_dt</code>.</li>
</ul>

<p><strong>Example:</strong></p>

<p><strong>Input:</strong></p>

<p><code>employees</code> table</p>

<table>
<thead>
<tr>
<th>id</th>
<th>salary</th>
</tr>
</thead>

<tbody>
<tr>
<td>INTEGER</td>
<td>FLOAT</td>
</tr>
</tbody>
</table>
<p><code>projects</code> table</p>

<table>
<thead>
<tr>
<th>employee_id</th>
<th>project_id</th>
<th>Start_dt</th>
<th>End_dt</th>
</tr>
</thead>

<tbody>
<tr>
<td>INTEGER</td>
<td>INTEGER</td>
<td>DATETIME</td>
<td>DATETIME</td>
</tr>
</tbody>
</table>
<p><strong>Output:</strong></p>

<table>
<thead>
<tr>
<th>total_slack_salary</th>
</tr>
</thead>

<tbody>
<tr>
<td>INTEGER</td>
</tr>
</tbody>
</table>


Find the total salary of slacking employees.

Slacking Employees Salaries

<p>You’ve been asked to analyze the player’s behaviors at a gaming company.</p>

<p>Write a query to get the number of players who played between 5 and 10 games (5 and 10 excluded), and the number of players who played 10 games or more.</p>

<p><strong>Example:</strong></p>

<p><strong>Input:</strong></p>

<p><strong><code>players</code></strong> table</p>

<table>
<thead>
<tr>
<th>Column</th>
<th>Type</th>
</tr>
</thead>

<tbody>
<tr>
<td>id</td>
<td>INTEGER</td>
</tr>

<tr>
<td>name</td>
<td>VARCHAR</td>
</tr>

<tr>
<td>games_played</td>
<td>INTEGER</td>
</tr>

<tr>
<td>registered_at</td>
<td>TIMESTAMP</td>
</tr>
</tbody>
</table>
<p><strong>Output:</strong></p>

<table>
<thead>
<tr>
<th>Column</th>
<th>Type</th>
</tr>
</thead>

<tbody>
<tr>
<td>players_more_than_5_to_10_games</td>
<td>INTEGER</td>
</tr>

<tr>
<td>players_10_plus_games</td>
<td>INTEGER</td>
</tr>
</tbody>
</table>


Obtain count of players based on games played.

Player Analysis

<p>You have been given a table <code>tbl_numbers</code> with only one column: <code>int_numbers</code>.  It can have one integer number value per row in a sequential manner.</p>

<p>Write a query to return the number repeated by one times its own value.</p>

<p>For example, the integer number 5 would appear five times in the output (1 times 5).</p>

<p><strong>Example:</strong></p>

<p><strong>Input:</strong></p>

<p><code>tbl_numbers</code> table</p>

<table>
<thead>
<tr>
<th>int_numbers</th>
</tr>
</thead>

<tbody>
<tr>
<td><code>1</code></td>
</tr>

<tr>
<td><code>2</code></td>
</tr>

<tr>
<td><code>3</code></td>
</tr>

<tr>
<td><code>4</code></td>
</tr>
</tbody>
</table>
<p><strong>Output:</strong></p>

<table>
<thead>
<tr>
<th>seq_numbers</th>
</tr>
</thead>

<tbody>
<tr>
<td><code>1</code></td>
</tr>

<tr>
<td><code>2</code></td>
</tr>

<tr>
<td><code>2</code></td>
</tr>

<tr>
<td><code>3</code></td>
</tr>

<tr>
<td><code>3</code></td>
</tr>

<tr>
<td><code>3</code></td>
</tr>

<tr>
<td><code>4</code></td>
</tr>

<tr>
<td><code>4</code></td>
</tr>

<tr>
<td><code>4</code></td>
</tr>

<tr>
<td><code>4</code></td>
</tr>
</tbody>
</table>


Sequentially Fill in Integers

Duolingo Business Intelligence Interview Questions

Our mission at Duolingo is to develop the best education in the world and make it universally available. It’s a big mission, and that’s where you come in!
At Duolingo, you’ll join a team that cares about finding innovative solutions to complex technical problems , running countless experiments (300+ at a time!) with our massive user base to make data-driven decisions, and educating our users and employees alike. You’ll have limitless learning opportunities, mentorship and collaboration with world-class minds, and a variety of projects with large scopes — while doing work that’s both fun and meaningful.
Join our life-changing mission to develop education for our half a billion (and growing!) learners around the world.
Below you can find more information about the teams we're hiring for:   DevX AI Team:
The DevX AI team empowers engineers at Duolingo to be more effective, by introducing AI-infused tools that simplify workflows and reduce friction and toil. As a Staff Engineer in the team, you’ll play a pivotal role in shaping the future of engineering at Duolingo. You will define the strategy and architecture of AI-driven developer tools, mentor senior engineers, and drive high-leverage initiatives that touch every part of our software lifecycle. You will build developer tooling that amplify the impact of engineers, including productionizing an MCP infrastructure to connect with AI coding agents.
You will...    Develop, release, and maintain backend services and/or infrastructure
Introduce and iterate on developer tools, and advocate for adoption
Collaborate on projects with developers across the company
Lead individual project priorities, milestones, and ensure we're always shipping
You have...    A Bachelor’s degree in Computer Science or related technical field
Strong competencies in data structures, algorithms, and software design
Experience programming in Java, Python, or Kotlin
Experience working closely with customers, and building products that they love
Exceptional candidates will have...    Industry experience with full stack development for iOS or Android
Industry experience building high-traffic products using public cloud providers
Experience integrating AI/ML systems into developer-facing tools, including prompt design, model evaluation, or agent workflow orchestration
Take a peek at how we care for our employees' holistic well-being with our benefitshere .
We will do everything we can within reason to make sure that your interview takes place in an environment that fairly and accurately assesses your skills. If you need assistance or accommodation, please contactaccommodations@duolingo.com .
Duolingo is proud to be an Equal Employment Opportunity employer. We do not discriminate based upon race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics.
We post a multi-level salary range for all of our roles.
This is not inclusive of the rest of our awesome portfolio that includes equity compensation and world-class benefits. Our salary ranges are the same for all US locations. Your recruiter can share more details about the range for a specific level during the hiring process.   The actual salary within the range is determined by many factors including but not limited to, skills, experience, education, and internal equity.
Salary Range:
$200,000 — $360,000 USD
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#J-18808-Ljbffr

Our mission at Duolingo is to develop the best education in the world and make it universally available. It’s a big mission, and that’s where you come in!
At Duolingo, you’ll join a team that cares about finding  innovative solutions to complex technical problems , running countless experiments (300+ at a time!) with our massive user base to make data-driven decisions, and educating our users and employees alike. You’ll have limitless learning opportunities, mentorship and collaboration with world-class minds, and a variety of projects with large scopes — while doing work that’s both fun and meaningful.
Join our life-changing mission to develop education for our half a billion (and growing!) learners around the world.
About the role  Our mission is to build platforms and infrastructure to help scale various product features on the Duolingo app by leveraging AI. Examples of our work are orchestration platforms built on top of Airflow, and tooling aimed at accelerating development with AI. We've fundamentally shifted the development paradigm at Duolingo, and we're excited for the future ahead as we explore how AI can further help us move faster.
Below you can find more information about the teams we're hiring for: Automation Platform Team: Our mission is to build platforms and infrastructure to help scale various product features on the Duolingo app by leveraging AI. Examples of our work are orchestration platforms built on top of Airflow, and tooling aimed to accelerating development with AI. We've fundamentally shifted the development paradigm at Duolingo, and we're excited for the future ahead as we explore how AI can help us move faster.
You will...   Collaborate on software projects with product design and backend aspects
Develop, release, and maintain backend services and/or infrastructure
Lead individual project priorities, milestones, and ensure we're always shipping
You have...   A Bachelor’s degree in Computer Science or related technical field
Strong competencies in data structures, algorithms, and software design
Experience programming in Java, Python, or Kotlin
Solid understanding of one or more database technologies
Exceptional candidates will have...   Industry experience building high-traffic APIs using public cloud providers
Take a peek at how we care for our employees' holistic well-being with our benefits  here .
We will do everything we can within reason to make sure that your interview takes place in an environment that fairly and accurately assesses your skills. If you need assistance or accommodation, please contact your recruiter.
Duolingo is proud to be an Equal Employment Opportunity employer. We do not discriminate based upon race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics.
By applying for this position your data will be processed as per the  Duolingo Applicant Privacy Notice .
We post a multi-level salary range for all of our roles.
This is not inclusive of the rest of our awesome portfolio that includes equity compensation and world-class benefits. Our salary ranges are the same for all US locations. Your recruiter can share more details about the range for a specific level during the hiring process. The actual salary within the range is determined by many factors including but not limited to, skills, experience, education, and internal equity.
Salary Range: $148,800 — $274,600 USD Take a peek at how we care for our employees' holistic well-being with our benefits here .
We will do everything we can within reason to make sure that your interview takes place in an environment that fairly and accurately assesses your skills. If you need assistance or accommodation, please contact accommodations@duolingo.com .
Duolingo is proud to be an Equal Employment Opportunity employer. We do not discriminate based upon race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics.
By applying for this position your data will be processed as per the Duolingo Applicant Privacy Notice .

#J-18808-Ljbffr

Question	Topic	Difficulty	Ask Chance
Slacking Employees Salaries	SQL	Medium	Very High
Player Analysis	SQL	Easy	Very High
Sequentially Fill in Integers	SQL	Hard	Very High

Duolingo Business Intelligence Interview Guide

Overview

Duolingo Business Intelligence Interview Process

Duolingo Business Intelligence Interview Questions

Duolingo Business Intelligence Jobs