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Suppose there exists a new airline named Jetco that flies domestically across North America. Jetco recently had a study commissioned that tested the boarding time of every airline, and it came out that Jetco had the fastest average boarding times of any airline.

What factors could have biased this result, and what would you look into?

What could potentially bias the average boarding time in favor of an airline that only flies domestically?

What could potentially bias the average boarding time in favor of an airline that only flies domestically?

Boarding Times Bias

A new airline came out as the fastest average boarding times compared to other airlines.  What factors could have biased this result and what would you look into?

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 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

Care.Com Salaries by Position

<h3>Job Description</h3><div>Job Description<div>About Care.comCare.com is a consumer tech company with heart. We're on a mission to solve a human challenge we all face: finding great care for the ones we love. We're moms and dads and pet parents. We have parents and grandparents, so we understand that everyone, at some point in their lives, could use a helping hand. Our culture and our products reflect that. Care.com offers of an array of services that enable families to find, manage and pay for care and provide employment opportunities for caregivers. Our engineering organization is reimagining our tech stacks and consolidating to a single cloud native platform, so we can test and learn faster.The new platform is composed of gRPC microservices and Lambdas in Go, Kafka streams, DynamoDB, Elasticsearch, GraphQL, and micro-frontends on Node and React. We're utilizing industry practices and tools like OpenTelemetry, Splunk, Github, SignalFX, Figma, and others to make our lives easier. Here, entrepreneurs, self-starters, standout colleagues, and big problem solvers unite behind a common cause. Here, we're applying data analytics, AI, and the latest technologies to solve universal problems and connect people in new ways. If you like having autonomy, if you flourish with collaboration and building new things, and if you're all about using your talent for good, Care.com is the place for you.Office Locations: Salt Lake City, UT | Austin, TX | Dallas, TX Work Environment: HybridWhat You'll Be Working On:We are seeking a highly motivated individual to join our Safety team as a Senior / Staff Full Stack Engineer. The candidate would be primarily focused on the backend with some front end development. <ul><li>Work with partners in product management to understand business requirements</li><li>Collaborate with multi-functional teams like Product Engineering, DevOps, Identify, Infrastructure, Platform Engineering, etc.</li><li>Own and review work for accuracy, quality, performance, and completeness</li></ul>Technologies We Work With:<ul><li>React</li><li>Java</li><li>Next.js framework</li><li>Javascript</li><li>CSS / CSS-in-JS</li><li>Jest</li><li>Enzyme</li><li>GraphQL</li><li>Typescript</li><li>Node.js</li><li>Golang is a plus</li><li>Apollo</li><li>CI/CD is a plus</li><li>Storybook is a plus</li><li>Webpack is a plus</li></ul>What You'll Need to Succeed:<ul><li>5+ Years Professional Experience</li><li>4+ years Java experience </li><li>1+ years React experience</li><li>Good knowledge of API design and development</li><li>Ability to thrive as part of a multi-site development team</li><li>Ability to test, debug and monitor your own code</li><li>A bias to action and passion for problem-solving</li><li>Knowledge of AWS or other cloud technologies</li><li>Worked with CI/CD tools with an emphasis on building quality code and speed to market</li></ul>For a list of our Perks + Benefits, click here!Care.com supports diverse families and communities and seeks employees who are just as diverse. As an equal opportunity employer, Care.com recognizes the power of a diverse and inclusive workforce and encourages applications from individuals with varied experiences, perspectives, and backgrounds. Care.com is committed to providing reasonable accommodations for qualified individuals with disabilities. If you need assistance or an accommodation, please reach out to talent@care.com.Company Overview:Available in more than 20 countries, Care.com is the world's leading platform for finding and managing high-quality family care. Care.com is designed to meet the evolving needs of today's families and caregivers, offering everything from household tax and payroll services and customized corporate benefits packages covering the care needs of working families, to innovating new ways for caregivers to be paid and obtain professional benefits. Since 2007, families have relied on Care.com's industry-leading products—from child and elder care to pet care and home care. Care.com is an IAC company (NASDAQ: IAC).Salary Range: 140,000 - 170,000. The base salary range above represents the anticipated low and high end of the salary range for this position. Actual salaries may vary and may be above or below the range based on various factors including but not limited to work location, experience, and performance. The range listed is just one component of Care's total compensation package for employees. Other rewards may include annual bonuses and short- and long-term incentives. In addition, Care.com provides a variety of benefits to employees, including health insurance coverage, life, and disability insurance, a generous 401K employer matching program, paid holidays, and paid time off (PTO).</div></div>

<h3>Job Description</h3><div>Job Description<div>Care.com is a consumer tech company with heart. We're on a mission to solve a human challenge we all face: finding great care for the ones we love. We're moms and dads and pet parents. We have parents and grandparents so we understand that everyone, at some point in their lives, could use a helping hand. Our culture and our products reflect that.At Care.com, entrepreneurs, self-starters, team players, and big thinkers unite behind a common cause. Here, we're applying data analytics, AI, and the latest technologies to solve universal problems and connect people in new ways. If you like having autonomy, if you thrive on collaboration and building new things, and if you're all about using your talent for good, Care.com is the place for you.Care.com is seeking a highly motivated Senior Product Manager to join our team. The ideal candidate will be a data-focused Product Manager who has experience taking a product from zero to one, has a consumer experience-centric mindset, and can drive growth through both incremental improvements, product turnarounds as well as strategic big bets. Experience from a Marketplace, Subscription, and/or Transaction business is highly preferred.About the roleYou are a product leader who wants to drive user acquisition, activation, and revenue growth for our products. Each day you will lead cross-functional initiatives, leveraging data-driven insights and experimentation to optimize user experiences and drive measurable business outcomes. You will work closely with cross-functional teams including engineering, design, marketing, and data analytics to deliver impactful growth initiatives that enhance customer lifetime value. Care.com is seeking an experienced, results-driven Sr. Product Manager. This person will support our two-sided marketplace and will help improve our ability to consistently match families who have care needs to providers who can fulfill those needs. What you'll do<ul><li>Design, build, and test innovative changes to improve the platform during onboarding, reduce friction, and enhance the user experience that powers our marketplace. </li><li>Drive cross-functional initiatives to modernize and create a frictionless login experience for returning customers</li><li>Own and build a roadmap based on cross-functional objectives and key results that builds momentum, and inspires passion in the engineering team you'll lead in partnership with the Engineering Manager.</li><li>Lead cross-functional initiatives when there are dependencies beyond your team's domain.</li><li>Develop a deep understanding of all metrics in the marketplace so you're always making data-driven decisions that properly balance short-term revenue and long-term value.</li><li>Ruthlessly prioritize the most impactful things so you're always learning what's best for our customers.</li></ul>Who you are<ul><li>Experienced problem solver: you have 5+ years of product experience, including leadership of an engineering team. If not direct Product Management experience, you have experience solving problems for customers and leading teams to build solutions. Experience working on Search products a strong plus!</li><li>Deeply curious: you operate with a sense of urgency and always look for new ways to understand our customers and create value on their behalf.</li><li>Data-fluent: you use data to solve problems, identify opportunities, and are capable of inventing and using new metrics to learn and make decisions. You are excited to dive deep into the data using analytical tools and SQL.</li><li>Biased for action: you make good decisions with incomplete data and are constantly optimizing for learning. You find creative ways around blockers and always have an option for what's next and never an excuse for why you can't proceed.</li><li>A bar raiser: you inspire others to bring their 'A' game and are constantly looking for opportunities for improvement. You don't accept "because that is the way we've always done it."</li><li>An owner: you can seamlessly straddle thinking about both the product and the business and are equally comfortable talking about funnel metrics and P+L's. You never say "that is not my job."</li><li>A compelling story-teller: you use both qualitative and quantitative data to influence key stakeholders, inspire your team, and you can tailor your message to your audience.</li><li>Collaborative partner: you are able to build strong relationships, you are a servant leader to your engineering team, and you seamlessly juggle priorities of multiple stakeholders.</li></ul>We value diversityWe know that the best ideas come from teams where diverse points of view uncover new solutions to hard problems. We welcome and value individuals who bring diverse life experiences, educational backgrounds, cultures, and work experiences.PLEASE NOTE: At this time, Care does NOT hire in in any of the following states: Alaska, Arkansas, California, Delaware, Hawaii, Iowa, Idaho, Maine, Minnesota, Mississippi, Montana, North Dakota, Nevada, Oregon, Rhode Island, South Dakota, Washington, West Virginia, Wyoming, Vermont.Company Overview:Available in more than 21 countries, Care.com is the world's leading platform for finding and managing high-quality family care. Care.com is designed to meet the evolving needs of today's families and caregivers, offering everything from household tax and payroll services and customized corporate benefits packages covering the care needs of working families to innovating new ways for caregivers to be paid and obtain professional benefits. Since 2007, families have relied on Care.com's industry-leading products—from child and elder care to pet care and home care. Care.com is an IAC company (NASDAQ: IAC).Salary Range: 125,000 - 150,000 The base salary range above represents the anticipated low and high end of the salary range for this position. Actual salaries may vary and may be above or below the range based on various factors including but not limited to work location, experience, and performance. The range listed is just one component of Care.com's total compensation package for employees. Other rewards may include annual bonuses and short- and long-term incentives. In addition, Care.com provides a variety of benefits to employees, including health insurance coverage, life, and disability insurance, a generous 401K employer matching program, paid holidays, and paid time off (PTO).</div></div>

<h3>Job Description</h3><div>Job Description<div>About Care.com Care.com is a consumer tech company with heart. We're on a mission to solve a human challenge we all face: finding great care for the ones we love. We're moms and dads and pet parents. We have parents and grandparents so we understand that everyone, at some point in their lives, could use a helping hand. Our culture and our products reflect that. Care.com offers of an array of services that enable families to find, manage and pay for care and provide employment opportunities for caregivers. Our engineering organization is reimagining our tech stacks and consolidating to a single cloud native platform so we can test and learn faster. The new platform is composed of gRPC microservices and Lambdas in Go, Kafka streams, DynamoDB, Elasticsearch, GraphQL, and micro-frontends on Node and React. We're utilizing industry best practices and tools like OpenTelemetry, Splunk, Github, SignalFX, Figma, and others to make our lives easier. Here, entrepreneurs, self-starters, team players, and big thinkers unite behind a common cause. Here, we're applying data analytics, AI, and the latest technologies to solve universal problems and connect people in new ways. If you like having autonomy, if you thrive on collaboration and building new things, and if you're all about using your talent for good, Care.com is the place for you. As a Senior Engineering Manager, you're probably wondering: what do Mobile Engineering Teams do at Care?Our Mobile Engineers work along with designers and product managers to build and launch new features for our apps. You'll work on large-scale consumer apps that are ever-changing, enabling millions of families to find the care they need for their loved ones. Our Android engineers use Kotlin and our iOS engineers use Swift. What you'll do as a Mobile Software Engineering Manager at Care:<ul><li>Manage a team of iOS and Android engineers - helping them prioritize, build, and ship impactful features for our users.</li><li>Partner with product leadership to build a composite roadmap that reflects the priorities in the different areas and continuously rebalance the teams to react to changes in the surrounding conditions</li><li>Work on problems with your team, roll up your sleeves, form an opinion and advocate for engineering-specific roadmap items</li><li>Work with product, UX and other disciplines to discover the best solutions for our users</li><li>Build your team, both through internal development and external hiring</li><li>Improve yourself as a leader by learning with and from other leaders at Care and through your own self-directed learning </li></ul>Experience and skills that are important for success in this role:<ul><li>Proven team leadership skills - your management skills and technical depth allow you to develop and mentor others and build credibility with your team, while executing broader engineering strategies</li><li>Proven background in mobile development. You feel comfortable diving into the code and interacting with developers at all levels of seniority</li><li>Experience consuming and building APIs with the considerations of mobile applications</li><li>Comfort working with senior stakeholders (Director level and up), both technical and non-technical</li><li>10+ years of professional engineering experience </li><li>5+ years of engineering management experience </li><li>BS or MS in Computer Science or a similar engineering field</li></ul>Location: This role is to be based in Dallas, TXFor a list of our Perks + Benefits, click here!**Care.com supports diverse families and communities and seeks employees who are just as diverse. As an equal opportunity employer, Care.com recognizes the power of a diverse and inclusive workforce and encourages applications from individuals with varied experiences, perspectives, and backgrounds. Care.com is committed to providing reasonable accommodations for qualified individuals with disabilities. If you need assistance or an accommodation, please reach out to talent@care.com.**____________________________________________________________________________________________________________________________Company Overview:Available in more than 20 countries, Care.com is the world's leading platform for finding and managing high-quality family care. Care.com is designed to meet the evolving needs of today's families and caregivers, offering everything from household tax and payroll services and customized corporate benefits packages covering the care needs of working families, to innovating new ways for caregivers to be paid and obtain professional benefits. Since 2007, families have relied on Care.com's industry-leading products—from child and elder care to pet care and home care. Care.com is an IAC company (NASDAQ: IAC). Salary Range: 170,000 to 200,000. The base salary range above represents the anticipated low and high end of the national salary range for this position. Actual salaries may vary and may be above or below the range based on various factors including but not limited to work location, experience, and performance. The range listed is just one component of Care.com's total compensation package for employees. Other rewards may include annual bonuses and short- and long-term incentives. In addition, Care.com provides a variety of benefits to employees, including health insurance coverage, life, and disability insurance, a generous 401K employer matching program, paid holidays, and paid time off (PTO). </div></div>

<h3>Job Description</h3><div>Job Description<div>About Care.com Care.com is a consumer tech company with heart. We're on a mission to solve a human challenge we all face: finding great care for the ones we love. We're moms and dads and pet parents. We have parents and grandparents so we understand that everyone, at some point in their lives, could use a helping hand. Our culture and our products reflect that Here, entrepreneurs, self-starters, team players, and big thinkers unite behind a common cause. Here, we're applying data analytics, AI and the latest technologies to solve universal problems and connect people in new ways. If you like having autonomy, if you thrive on collaboration and building new things, and if you're all about using your talent for good, Care.com is the place for you.Hybrid Office Locations: Salt Lake City, Utah | Dallas, Texas | Austin Texas | New York, NYWhat Your Days Will be Like:<ul><li>Participate in team collaborative agile ceremonies</li><li>Help mentor junior engineers</li><li>Raise the bar in coding standards and agile processes</li><li>Deliver high quality features for our customers</li><li>Have ownership and accountability for the team's work</li><li>Care about how our customers are using our products through production monitoring</li></ul>What You'll Be Working On: <ul><li>Evaluate and recommend tools and technologies to ensure the highest quality product platform</li><li>Collaborate with peer organizations, quality assurance and end users to produce cutting-edge software solutions</li><li>Develop highly available and highly scalable applications</li><li>Generate technical documentation as well as unit and functional tests</li><li>Shape development processes to promote a high-quality output while continuing to iterate</li><li>Mentor and guide the professional and technical development of team members</li></ul>What You'll Need to Succeed:The right individual will be a proactive, self-starter that enjoys and thrives when connecting people and technology to solve complex problems at-scale. You love researching industry trends and remaining current on emerging technology. You have a knack for recommending which technologies and vendor products should be brought into the portfolio to solve relevant business and delivery problems. You will analyze, model, and develop complex and high-level architecture plans that require the integration of multiple technologies and coordination of functional areas across the organization. If you have a passion for long-term end-to-end thinking balanced with working directly with delivery teams to craft increments that enable value for customers now, this role is for you! <ul><li><ul><li>5+ Years Professional Experience </li><li>BS in Computer Science, Mathematics, Information Systems or some form of Engineering </li><li>Experience with AWS infrastructure</li><li>Experience developing scalable, multi-tier web solutions, ideally for a consumer website</li><li>Experience with relational databases, document databases and/or key/value stores</li><li>Experience with the following:<ul><li>Java</li><li>GoLang</li><li>Kafka</li><li>Docker</li><li>Kubernetes</li><li>GraphQL / REST / gRPC</li></ul></li></ul></li></ul>For a list of our Perks + Benefits, click here!**Care.com supports diverse families and communities and seeks employees who are just as diverse. As an equal opportunity employer, Care.com recognizes the power of a diverse and inclusive workforce and encourages applications from individuals with varied experiences, perspectives, and backgrounds. Care.com is committed to providing reasonable accommodations for qualified individuals with disabilities. If you need assistance or an accommodation, please reach out to talent@care.com.**____________________________________________________________________________________________________________________________Company Overview:Available in more than 21 countries, Care.com is the world's leading platform for finding and managing high-quality family care. Care.com is designed to meet the evolving needs of today's families and caregivers, offering everything from household tax and payroll services and customized corporate benefits packages covering the care needs of working families, to innovating new ways for caregivers to be paid and obtain professional benefits. Since 2007, families have relied on Care.com's industry-leading products—from child and elder care to pet care and home care. Care.com is an IAC company (NASDAQ: IAC). Salary Range: 140,000 - 170,000. The base salary range above represents the anticipated low and high end of the salary range for this position. Actual salaries may vary and may be above or below the range based on various factors including but not limited to work location, experience, and performance. The range listed is just one component of Care's total compensation package for employees. Other rewards may include annual bonuses and short- and long-term incentives. In addition, Care.com provides a variety of benefits to employees, including health insurance coverage, life, and disability insurance, a generous 401K employer matching program, paid holidays, and paid time off (PTO).</div></div>

<h3>Job Description</h3><div>Job Description<div>About Care.com Care.com is a consumer tech company with heart. We're on a mission to solve a human challenge we all face: finding great care for the ones we love. We're moms and dads and pet parents. We have parents and grandparents so we understand that everyone, at some point in their lives, could use a helping hand. Our culture and our products reflect that.Here, entrepreneurs, self-starters, team players, and big thinkers unite behind a common cause. Here, we're applying data analytics, AI and the latest technologies to solve universal problems and connect people in new ways. If you like having autonomy, if you thrive on collaboration and building new things, and if you're all about using your talent for good, Care.com is the place for you.What Your Days Will be Like:Our team works on the technology platform for our out-of-home provider network: the products and systems that power our relationships with daycare and family childcare centers, preschools, camp providers, and other businesses providing services outside the home.What You'll Be Working On: <ul><li>Design, develop, and deploy features on both the front and back end;</li><li>Integrate with essential third-party services and APIs;</li><li>Ensure appropriate automated test coverage for efficient uptime and product reliability;</li><li>Communicate both blockers and progress with the rest of the engineering team, as well as partners on other teams.</li><li>We're revamping several legacy systems (one of which is largely built in Java/.NET and MySQL).</li><li>Rapidly growing our platform and building new functionalities.</li></ul>What You'll Need to Succeed:<ul><li>Have 3-5 years of software development experience.</li><li>The ideal candidate is someone who thrives in a fast-paced environment.</li><li>Expertise in Ruby/Rails language, who's also passionate about dabbling in other frameworks and technologies (e.g. Go, React.js, GitHub Actions);</li><li>Communicates clearly and optimally, and demonstrates a track record of working optimally across engineering, product and business-oriented teams;</li><li>You enjoy building new products as well as testing/refactoring existing code</li><li>Bachelor's in Computer Science, Information Technology, or related field</li><li>Nice to have: It would be a PLUS if the candidate has built previous projects using: Heroku/AWS, Stripe, Solr, Minitest/Capybara, GitHub Actions, Java and Postgres, but not required</li></ul>For a list of our Perks + Benefits, click here!Care.com supports diverse families and communities and seeks employees who are just as diverse. As an equal opportunity employer, Care.com recognizes the power of a diverse and inclusive workforce and encourages applications from individuals with varied experiences, perspectives, and backgrounds. Care.com is committed to providing reasonable accommodations for qualified individuals with disabilities. If you need assistance or accommodation, please reach out to talent@care.com.Company Overview:Available in 21 countries, Care.com is one of the largest providers of online services for finding family care and care jobs, spanning in-home and in-center care solutions. Since 2007, families have relied on Care.com for an array of care for children, seniors, pets, and the home. Designed to meet the evolving needs of today's families and caregivers, the Company also offers customized corporate benefits packages to support working families, household tax and payroll services, and innovations for caregivers to find and book jobs. Care.com is an IAC company (NASDAQ: IAC).Salary Range: $120,000 - 145,000The base salary range above represents the anticipated low and high end of the national salary range for this position. Actual salaries may vary and may be above or below the range based on various factors including but not limited to work location, experience, and performance. The range listed is just one component of Care.com's total compensation package for employees. Other rewards may include annual bonuses and short- and long-term incentives. In addition, Care.com provides a variety of benefits to employees, including health insurance coverage, life, and disability insurance, a generous 401K employer matching program, paid holidays, and paid time off (PTO).</div></div>

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Care.Com Interview Questions

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