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Let’s say we have a table with an <code>id</code> and <code>name</code> fields. The table holds over 100 million rows and we want to sample a random row in the table without throttling the database.

Write a query to randomly sample a row from this table.

Input:

<code>big_table</code> table

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

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

<tr>
<td><code>name</code></td>
<td>VARCHAR</td>
</tr>
</tbody>
</table>

Write a query to randomly sample a row from a big table.

Random SQL Sample

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?

Experiment Validity

Let’s say you work for a social media company that has just done a launch in a new city. Looking at weekly metrics, you see a slow decrease in the average number of comments per user from January to March in this city.

The company has been consistently growing new users in the city from January to March.

What are some reasons why the average number of comments per user would be decreasing and what metrics would you look into?

What metric could be used to measure if active users are still engaging on the platform despite an overall decrease in the average number of comments per user?

What metric could be used to measure if active users are still engaging on the platform despite an overall decrease in the average number of comments per user?

Decreasing Comments

How would you investigate a decline in the average number of comments per user?

Heliocampus Salaries by Position

Who We Are: HelioCampus was founded with the purpose of helping college & university leaders navigate today's growing pressures. As one of EdTech's most steadily growing companies, our roots in higher ed ground us in the critical nature of this work. What We Do: We help our clients navigate today's high stakes with data and Institutional Performance Management practices. Together with our clients, we chart a path to sustainability by borrowing practices from the most successful businesses. How We Do It: We approach our work with a "we're on it" attitude that the higher ed community has come to know and expect from our team. We're data geeks to our core, committed to simplifying the toughest challenges and operating with transparency. Our most successful team members are change agents who love a challenge. How You'll Help: We are looking for an enthusiastic, self-driven Business Intelligence Engineer II with a passion for empirical research and data-driven insights, specializing in Tableau Server. As a BI Engineer II, you will be responsible for designing, building, and testing our reporting platform, with a focus on data modeling and transformation to deliver streamlined datasets for business intelligence and data science applications. What You Will Do: <ul><li>Develop, test, and maintain Python scripts to support data processing and analysis tasks. </li><li>Utilize Tableau APIs to automate and enhance data visualization, reporting processes, and data source management. </li><li>Administer and manage Tableau Server, ensuring optimal performance and security. </li><li>Tableau report development, data source development, user management. </li><li>Collaborate with cross-functional teams to understand business requirements and translate them into technical solutions. </li><li>Monitor data quality and troubleshoot issues related to data integration and visualization. </li><li>Provide support and training to end-users for BI tools and solutions. </li></ul>You Will Be a Good Fit For This Role If You Have:<ul><li>A minimum of 2 years of experience as a Tableau Developer working with Tableau Server and Tableau APIs </li><li>A minimum of 2 years of experience with relational database, SQL, Amazon Redshift / PostgreSQL </li><li>Strong analytical and problem-solving skills. </li><li>Excellent communication skills and ability to work collaboratively in a team environment </li><li>Bachelor's degree in Computer Science, Information Systems, or a related field </li></ul>Nice To Have's Include: <ul><li>Experience in higher-ed </li><li>Knowledge of university administrative organization, policies, procedures, and practices for institutional research-oriented roles </li><li>Ability to tell stories with data using data visualization software Tableau, Excel, R, Python, or similar </li><li>Prior experience in manipulating and analyzing complex, high-volume, high dimensionality data from various sources </li><li>Analytical approach and the ability to work independently as well as collaboratively </li></ul> Location: HelioCampus has two locations, Bethesda, MD and Chapel Hill, NC. This specific role is primarily remote, with occasional travel to an office or client site Compensation and Benefits: HelioCampus offers employees a competitive salary along with paid time off, healthcare, vision, dental, 401(k) w/ company match, parental leave, remote work flexibility, home office perks, and a fun, collaborative work environment. What We Believe: HelioCampus is an equal opportunity employer, and all qualified candidates will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status. Disclaimer: The list of responsibilities described above is not comprehensive. Other tasks not mentioned here may be required. Changing business conditions may trigger changes to job responsibilities. This job description is not an employment contract. Physical Qualifications: This position requires the following physical qualifications to support a productive remote work environment. We are dedicated to providing reasonable accommodations for individuals with disabilities to perform the essential functions of this role. If you require accommodations, please discuss this during the application process. Vision: Sufficient visual acuity to read documents, view computer screens, and engage in tasks that require attention to detail. Hearing: Ability to communicate effectively in person (as applicable) and via phone or video conferencing, ensuring clear understanding of verbal instructions. Fine Motor Skills: Proficient use of hands for typing, using a mouse, and managing office equipment such as printers and scanners. Lifting: Occasional lifting of up to 10 pounds (e.g., office supplies or equipment). Department Data Management Role Business Intelligence Engineer Locations Remote Remote status Fully Remote

Who We Are: HelioCampus was founded with the purpose of helping college & university leaders navigate today's growing pressures. As one of EdTech's most steadily growing companies, our roots in higher ed ground us in the critical nature of this work. What We Do: We help our clients navigate today's high stakes with data and Institutional Performance Management practices. Together with our clients, we chart a path to sustainability by borrowing practices from the most successful businesses. How We Do It: We approach our work with a "we're on it" attitude that the higher ed community has come to know and expect from our team. We're data geeks to our core, committed to simplifying the toughest challenges and operating with transparency. Our most successful team members are change agents who love a challenge. How You'll Help: We are looking for an enthusiastic, self-driven Business Intelligence Engineer II with a passion for empirical research and data-driven insights, specializing in Tableau Server. As a BI Engineer II, you will be responsible for designing, building, and testing our reporting platform, with a focus on data modeling and transformation to deliver streamlined datasets for business intelligence and data science applications. What You Will Do: <ul><li>Develop, test, and maintain Python scripts to support data processing and analysis tasks.</li><li>Utilize Tableau APIs to automate and enhance data visualization, reporting processes, and data source management.</li><li>Administer and manage Tableau Server, ensuring optimal performance and security.</li><li>Tableau report development, data source development, user management.</li><li>Collaborate with cross-functional teams to understand business requirements and translate them into technical solutions.</li><li>Monitor data quality and troubleshoot issues related to data integration and visualization.</li><li>Provide support and training to end-users for BI tools and solutions.</li></ul> You Will Be a Good Fit For This Role If You Have: <ul><li>A minimum of 2 years of experience as a Tableau Developer working with Tableau Server and Tableau APIs</li><li>A minimum of 2 years of experience with relational database, SQL, Amazon Redshift / PostgreSQL</li><li>Strong analytical and problem-solving skills.</li><li>Excellent communication skills and ability to work collaboratively in a team environment</li><li>Bachelor's degree in Computer Science, Information Systems, or a related field</li></ul> Nice To Have's Include: <ul><li>Experience in higher-ed</li><li>Knowledge of university administrative organization, policies, procedures, and practices for institutional research-oriented roles</li><li>Ability to tell stories with data using data visualization software Tableau, Excel, R, Python, or similar</li><li>Prior experience in manipulating and analyzing complex, high-volume, high dimensionality data from various sources</li><li>Analytical approach and the ability to work independently as well as collaboratively</li></ul> Location: HelioCampus has two locations, Bethesda, MD and Chapel Hill, NC. This specific role is primarily remote, with occasional travel to an office or client site Compensation and Benefits: HelioCampus offers employees a competitive salary along with paid time off, healthcare, vision, dental, 401(k) w/ company match, parental leave, remote work flexibility, home office perks, and a fun, collaborative work environment. What We Believe: HelioCampus is an equal opportunity employer, and all qualified candidates will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status. Disclaimer: The list of responsibilities described above is not comprehensive. Other tasks not mentioned here may be required. Changing business conditions may trigger changes to job responsibilities. This job description is not an employment contract. Physical Qualifications: This position requires the following physical qualifications to support a productive remote work environment. We are dedicated to providing reasonable accommodations for individuals with disabilities to perform the essential functions of this role. If you require accommodations, please discuss this during the application process. Vision: Sufficient visual acuity to read documents, view computer screens, and engage in tasks that require attention to detail. Hearing: Ability to communicate effectively in person (as applicable) and via phone or video conferencing, ensuring clear understanding of verbal instructions. Fine Motor Skills: Proficient use of hands for typing, using a mouse, and managing office equipment such as printers and scanners. Lifting: Occasional lifting of up to 10 pounds (e.g., office supplies or equipment). Department Data Management Role Business Intelligence Engineer Locations Remote Remote status Fully Remote

<h3>Job Description</h3><div>Job Description<div>Who We Are: HelioCampus was founded with the purpose of helping college & university leaders navigate today’s growing pressures. As one of EdTech’s most steadily growing companies, our roots in higher ed ground us in the critical nature of this work. What We Do: We help our clients navigate today’s high stakes with data and Institutional Performance Management practices. Together with our clients, we chart a path to sustainability by borrowing practices from the most successful businesses. How We Do It: We approach our work with a “we’re on it” attitude that the higher ed community has come to know and expect from our team. We’re data geeks to our core, committed to simplifying the toughest challenges and operating with transparency. Our most successful team members are change agents who love a challenge.How You'll Help: We are looking for an enthusiastic, self-driven Business Intelligence Engineer II with a passion for empirical research and data-driven insights, specializing in Tableau Server. As a BI Engineer II, you will be responsible for designing, building, and testing our reporting platform, with a focus on data modeling and transformation to deliver streamlined datasets for business intelligence and data science applications.What You Will Do: <ul><li>Develop, test, and maintain Python scripts to support data processing and analysis tasks. </li><li>Utilize Tableau APIs to automate and enhance data visualization, reporting processes, and data source management. </li><li>Administer and manage Tableau Server, ensuring optimal performance and security. </li><li>Tableau report development, data source development, user management. </li><li>Collaborate with cross-functional teams to understand business requirements and translate them into technical solutions. </li><li>Monitor data quality and troubleshoot issues related to data integration and visualization. </li><li>Provide support and training to end-users for BI tools and solutions. </li></ul>You Will Be a Good Fit For This Role If You Have: <ul><li>A minimum of 2 years of experience as a Tableau Developer working with Tableau Server and Tableau APIs </li><li>A minimum of 2 years of experience with relational database, SQL, Amazon Redshift / PostgreSQL </li><li>Strong analytical and problem-solving skills. </li><li>Excellent communication skills and ability to work collaboratively in a team environment </li><li>Bachelor's degree in Computer Science, Information Systems, or a related field </li></ul>Nice To Have’s Include:  <ul><li>Experience in higher-ed </li><li>Knowledge of university administrative organization, policies, procedures, and practices for institutional research-oriented roles </li><li>Ability to tell stories with data using data visualization software Tableau, Excel, R, Python, or similar </li><li>Prior experience in manipulating and analyzing complex, high-volume, high dimensionality data from various sources </li><li>Analytical approach and the ability to work independently as well as collaboratively</li></ul><ul></ul><ul></ul>Location: HelioCampus has two locations, Bethesda, MD and Chapel Hill, NC. This specific role is primarily remote, with occasional travel to an office or client site Compensation and Benefits: HelioCampus offers employees a competitive salary along with paid time off, healthcare, vision, dental, 401(k) w/ company match, parental leave, remote work flexibility, home office perks, and a fun, collaborative work environment.What We Believe: HelioCampus is an equal opportunity employer, and all qualified candidates will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status. Disclaimer: The list of responsibilities described above is not comprehensive. Other tasks not mentioned here may be required.  Changing business conditions may trigger changes to job responsibilities.  This job description is not an employment contract.Physical Qualifications:This position requires the following physical qualifications to support a productive remote work environment.  We are dedicated to providing reasonable accommodations for individuals with disabilities to perform the essential functions of this role. If you require accommodations, please discuss this during the application process. Vision: Sufficient visual acuity to read documents, view computer screens, and engage in tasks that require attention to detail.Hearing: Ability to communicate effectively in person (as applicable) and via phone or video conferencing, ensuring clear understanding of verbal instructions.Fine Motor Skills: Proficient use of hands for typing, using a mouse, and managing office equipment such as printers and scanners.Lifting: Occasional lifting of up to 10 pounds (e.g., office supplies or equipment). <ul></ul><ul></ul></div></div>

Heliocampus Interview Questions

Heliocampus Interview Guides

Heliocampus Interview Questions

Heliocampus Salaries by Position

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