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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

You are testing hundreds of hypotheses with many t-tests. What considerations should be made?

What is a key disadvantage of the F-test when compared to multiple t-tests?

What is a key disadvantage of the F-test when compared to multiple t-tests?

Hundreds of Hypotheses

You are testing hundreds of hypotheses with many t-tests. What considerations should be made?

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?

Koddi Salaries by Position

Koddi is excited to announce an Engineering training program geared towards recent graduates with Statistics or Computer Science degrees as well as recent grads who have completed coding bootcamps! The Koddi Cohort Program is an intensive 8-week training program that includes all aspects of Engineering at Koddi. In addition to technical training during this program, and on an ongoing basis, we will also provide instructor-led and self-paced leadership development opportunities. Program Highlights <ul><ul><li>Work with industry-leading experts to gain hands-on knowledge and experience</li><li>Gain a comprehensive understanding of the Koddi business </li><li>Have the opportunity to share and present ideas with team members</li><li>Participate in leadership workshops and soft skill development</li><li>Receive executive mentorship and peer-to-peer support throughout the program</li></ul>></ul> What you will do <ul><ul><li>Collaborate with a team of software engineers, contributing to an agile environment</li><li>Write clean, organized, and maintainable code </li><li>Assist in developing tools and libraries to support automation efforts</li><li>Support product features through various stages of development and deployment</li><li>Learn and apply software best practices while incorporating new technologies</li><li>Work with the product management and program teams to help define feature specifications and contribute to product development</li><li>Participate in analyzing and improving system efficiency and scalability</li><li>Ensure that business requirements are met by assisting in the creation and execution of automated tests</li><li>Contribute to technical discussions and actively participate in team problem-solving sessions</li></ul>></ul> What skills and experience you bring <ul><ul><li>Graduating with a Bachelors or Masters degree in Computer Science or successful completion of relevant bootcamp coursework</li><li>Graduation/Bootcamp completion date no later than May 2025</li><li>Demonstrated software engineering experience from previous internship, work experience, coding competitions, or publications</li><li>Experience with web application development, distributed and parallel systems, developing large software systems, or security software development</li><li>Demonstrate proficiency in data analysis, programming and software engineering</li><li>Ability to produce high quality code with good test coverage, using modern abstractions and frameworks</li><li>Experience in computer science, with competencies in data structures, algorithms and software design</li><li>Experience programming in two or more of the following languages: C, C++, C#, Java, JavaScript, Kotlin, Go, Python, Typescript or similar</li><li>Work independently, use available resources to get unblocked, and complete tasks on-schedule by exercising strong judgment and problem solving skills</li><li>Excellent analytical and problem-solving skills</li><li>Excellent communication skills and eagerness to learn </li><li>Enjoys working in a fast paced environment with high collaboration</li><li>Ability to work collaboratively in a team environment</li><li>Availability to be onsite for the duration of the program Monday-Friday in our Fort Worth office</li><li>Availability to work Full Time after the cohort program</li></ul>></ul> ABOUT KODDI Koddi is a global technology company with software and services that help top digital marketplaces effectively monetize their first-party audiences through industry-leading commerce media technology and strategy. Our enterprise platforms leverage first-party data to drive marketplace revenue and profit by improving user experience and target shoppers throughout the purchase path. Koddi's platforms enable any advertiser, any marketplace, in any industry to increase awareness, generate demand, and drive revenue.

Koddi is excited to announce a Product Management training program geared towards recent graduates with Computer Science or Economics degrees as well as recent grads who have completed Product Management bootcamps! The Koddi Cohort Program is an intensive 8-week training program that includes all aspects of Product Management at Koddi. In addition to technical training during this program, and on an ongoing basis, we will also provide instructor-led and self-paced leadership development opportunities. Program Highlights <ul><ul><li>Work with industry-leading experts to gain hands-on knowledge and experience</li><li>Gain a comprehensive understanding of the Koddi business </li><li>Have the opportunity to share and present ideas with team members</li><li>Participate in leadership workshops and soft skill development</li><li>Receive executive mentorship and peer-to-peer support throughout the program</li></ul>></ul> What you will do <ul><ul><li>Learn about the needs of Koddi's customers and gain a solid understanding of our competitive landscape.</li><li>Collaborate with cross-functional partners to help shape a roadmap for your area, incorporating feedback and developing insights.</li><li>Assist in writing clear product documentation that identifies key customer challenges to be addressed.</li><li>Gather data to make informed decisions, either by working with others who can provide the data or learning how to access it yourself.</li><li>Aim to improve product quality by paying close attention to detail and striving for excellence in every aspect of the product.</li></ul>></ul> What skills and experience you bring <ul><ul><li>Graduating with a Bachelors or advanced degree in Computer Science, Economics, or relevant technical field or successful completion of relevant bootcamp coursework</li><li>Graduation/Bootcamp completion date no later than May 2025</li><li>Ability to break down complex problems and make data-driven decisions.</li><li>Comfortable working with data, understanding metrics, and analyzing customer feedback</li><li>Experience presenting ideas, writing reports, or leading small group projects</li><li>Experience in gathering customer feedback, whether through projects, internships, or school assignments</li><li>Ability to manage timelines, prioritize tasks, and handle multiple responsibilities at once</li><li>Basic understanding of data analysis tools like Excel, Google Sheets, or even SQL</li><li>Excellent communication skills and eagerness to learn </li><li>Enjoys working in a fast paced environment with high collaboration</li><li>Ability to work collaboratively in a team environment</li><li>Availability to be onsite for the duration of the program Monday-Friday in our Fort Worth office</li><li>Availability to work Full Time after the cohort program</li></ul>></ul> ABOUT KODDI Koddi is a global technology company with software and services that help top digital marketplaces effectively monetize their first-party audiences through industry-leading commerce media technology and strategy. Our enterprise platforms leverage first-party data to drive marketplace revenue and profit by improving user experience and target shoppers throughout the purchase path. Koddi's platforms enable any advertiser, any marketplace, in any industry to increase awareness, generate demand, and drive revenue.

We're seeking a highly skilled Data Scientist to join us in driving innovation by solving complex problems in adtech. In this role you'll use billions of rows of data to design and deliver novel machine learning solutions that drive meaningful impact for our customers. Success in this role requires the ability to translate business goals and objectives into AI/ML solutions that help us achieve them along with a passion for delivering measurable results and the ability to thrive in a fast paced environment. What you will do <ul><ul><li>Work closely with data scientists, software engineers, and business stakeholders to understand company goals and objectives. Translate that understanding into machine learning solutions that address business challenges and opportunities.</li><li>Develop highly scalable machine learning and artificial intelligence solutions that address key growth challenges and provide meaningful insights on problems such as cross-channel optimization, and targeting optimization.</li><li>Build production grade models on large-scale datasets to optimize Ad delivery, relevancy performance by utilizing advanced statistical modeling, machine learning, and optimization and marketing science research.</li><li>Design and execute A/B tests to answer business questions</li><li>Provide thought leadership in applying innovative machine learning techniques to solve complex data science problems.</li><li>Stay current with advances in machine learning research and technologies, exploring new approaches and methodologies to enhance model capabilities and effectiveness.</li><li>Document methodologies, processes, and findings, sharing insights and best practices with the broader team to foster knowledge sharing and collaboration.</li><li>Participate in project planning/prioritization meetings, partner meetings, etc</li></ul>></ul> What skills and experience you bring <ul><ul><li>Advanced degree in statistics, computer science, operational research, engineering or related field. PhD preferred</li><li>Minimum 3 years of experience in a similar role. </li><li>Experience in a similar role in adtech.</li><li>Demonstrated expertise with Python. </li><li>Experience with machine learning tools and platforms including: Spark, Databricks,TensorFlow, Pytorch.</li><li>Worked extensively with machine learning techniques and advanced analytics (e.g. Deep Learning, Bandits, Causal Inference, Mathematical Optimization)</li><li>Advanced SQL skills - comfortable working with very large data sets preferably, you have experience with cloud environments such as AWS.</li></ul>></ul> ABOUT KODDI Koddi is a global technology company with software and services that help top digital marketplaces effectively monetize their first-party audiences through industry-leading commerce media technology and strategy. Our enterprise platforms leverage first-party data to drive marketplace revenue and profit by improving user experience and target shoppers throughout the purchase path. Koddi's platforms enable any advertiser, any marketplace, in any industry to increase awareness, generate demand, and drive revenue. We are committed to driving innovation and growth in the commerce media space. As part of that commitment, we've launched Koddi Academy-a learning platform designed to provide expert knowledge, competitive insights, and practical strategies for thriving in this fast-growing industry. Explore our latest certification course, Commerce Media Foundations, to deepen your expertise and stay ahead in the evolving world of commerce media. You can also sign up for our waiting list to be notified when new courses are released. Get started today at Koddi Academy.

Koddi Interview Questions

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Koddi Interview Questions

Koddi Salaries by Position

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