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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?

Otter.Ai Salaries by Position

Who we are At City Storage Systems, we're building Infrastructure for Better Food. We help restaurateurs around the world succeed in online food delivery. Our goal is to make food more affordable, higher quality, and convenient for everyone. We're changing the game for restaurateurs, whether they're entrepreneurs opening their first restaurant all the way through to your favorite global quick-service restaurant chains. What you'll do <ul> <li>Lead, direct, coach, and review the work of software engineering personnel to accomplish near-term and long-term operational plans and results. </li><li>Maintain strong, cohesive relationships with business leaders and PMs for the lifecycle of products from inception to launch. </li><li>Analyze product requirements, break them down into actionable tasks, and develop comprehensive work plans that outline the necessary resources, milestones, and timelines. </li><li>Provide accurate project estimations, considering various factors such as team capacity, skills, and potential risks. </li> </ul>What we're looking for <ul> <li>8+ years of total software engineering experience. </li><li>3+ years of leadership experience. </li><li>Demonstrated ability to make strategic decisions, balancing immediate needs with long-term objectives. </li><li>The ability to allocate resources effectively to maintain a balance between workload distribution and team productivity is crucial. </li></ul>Why join us <ul> <li>Growing market: You'll be focused on an $80 billion market projected to reach at least $500 billion by 2030 in the US alone. </li> <li>Changing the restaurant industry: You'll be part of a team that helps restaurants succeed in online food delivery. </li> <li>Collaborative environment: You will receive support and guidance from experienced colleagues and managers, helping you to learn, grow, and achieve your goals, and you'll work closely with other teams to ensure our customer's success. </li></ul> What else you need to know This role is based in our Seattle office location. We believe that people do their best work when they are together. As a company, we're in the marketplace of ideas and innovation. When you're constantly innovating, changing how an industry works, inventing new products and processes - and we are doing all these things - we believe we're better as a team in person. That's why all of our teams (except for our field-based roles) are now working from one of our office locations 5 days a week. Looking forward to sharing more about a Career of Substance at CSS! Ready to join us as we serve those who serve others? #LI-Onsite

Who we are City Storage Systems develops infrastructure for better food - from building kitchens in cities around the world where restaurateurs can run their businesses, to developing software and hardware that makes the process of delivering orders to eaters fast, accurate, and reliable. Our facilities house many restaurants under one roof, and enable thousands of eaters and couriers to pick up food that was ordered via first- and third-party channels. Running these facilities requires building a streamlined process that keeps food fresh and ensures quality - and that means sensors, robotics, and hardware integration that automates and optimizes workflows throughout our buildings and facilitates efficient human-to-facility interactions. What you'll do We're looking for a backend-focused Software Engineer to join our Money Engineering Team. Our team is responsible for making our food creation and delivery facilities efficient through robotics, custom hardware, and innovative software. We are a small team of frontend, backend, embedded, mobile, and mechanical engineers working across the stack to ship reliable systems around the world. You can see an example of the kinds of things we do on our tech blog, but you can also see it by ordering food from one of our facilities. As a Software Engineer at City Storage Systems, you'll help develop innovative new features and experiences for our customers. You will balance reliability with innovation, working with your fellow engineers, product managers, and sometimes users to craft efficient software and ship it to production. You'll leverage open-source and proprietary technologies and use languages and tools including Java, Go, Kubernetes, and CockroachDB. Your role will encompass a diverse range of responsibilities, including: <ul><li>Produce high-quality code by leading or contributing to large cross-functional projects that impact and drive business success. </li><li>Actively own features and define their long-term health, keeping scalability at the forefront of technical designs. </li><li>Assist our skilled operations and business teams in triaging and resolving production issues. </li><li>Work with other engineers from various teams across verticals and review code. </li><li>Build in a dynamic environment leveraging Data-Driven Development, Agile Methodologies, and Continuous Improvement. </li><li>Learn the product and bring forth ideas on how to make it better for our users and customers. </li></ul>What we're looking for <ul> <li>6+ years of industry software engineering experience with backend technologies, developing and shipping applications using languages such as Java and Go or similar. </li><li>Familiarity with the full life cycle of shipping applications, from architecture and implementation to testing and deployment. </li><li>Strong communicator who can explain complex topics to not only other engineers but also designers, product managers, and support. </li><li>Individual Contribution: A track record of significant contributions in previous roles, showcasing your ability to make a meaningful impact </li> <li>Strong ability to design and create long-lasting architecture from scratch and evolve existing systems </li><li>Bachelor's degree in Computer Science, Engineering, or related field, or equivalent training, fellowship, or work experience. </li><li>Experience working in a fast-paced environment and an appreciation for problems requiring breadth. </li><li>Expertise with JAVA </li><li>A love for good food. </li></ul>Why join us <ul> <li>Growing market: You'll be focused on a part of a market that's projected to reach at least $500 billion by 2030 in the US alone. </li><li>Changing the restaurant industry: You'll be part of a team that helps restaurants succeed in online food delivery, and be on the forefront of helping our facilities efficiently scale. </li><li>Collaborative environment: You will receive support and guidance from experienced colleagues and managers, helping you to learn, grow, and achieve your goals, and you'll work closely with other teams to ensure our customers' success. Our company's commitment to growing your Career of Substance includes regular written and verbal bidirectional feedback, clearly structured competencies, and opportunities to contribute to the team outside of your role's primary responsibilities. </li></ul> What else you need to know This role is based in our New York office location. We believe that people do their best work when they are together. As a company, we're in the marketplace of ideas and innovation. When you're constantly innovating, changing how an industry works, inventing new products and processes - and we are doing all these things - we believe we're better as a team in person. That's why all of our teams (except for our field-based roles) are now working from one of our office locations 5 days a week. Looking forward to sharing more about a Career of Substance at CloudKitchens! Ready to join us as we serve those who serve others? #LI-Onsite

The Opportunity Are you an experienced Senior Software Engineer, Backend looking to make a significant impact? We're seeking a talented individual to lead the development, deployment, and management of our web services and infrastructure. As a member of our engineering team, you'll collaborate with colleagues in technology, product management, and beyond, contributing to innovative solutions that serve the needs of end-user professionals and enterprise clients across various verticals. Your Impact <ul><li>Utilize your hands-on experience in developing technology using Python to drive impactful projects.</li><li>Demonstrate your expertise in building robust business logic with web frameworks such as Django and integrating them seamlessly with MySQL.</li><li>Leverage your proficiency in Nginx, Kafka, MySQL, Cassandra, Redis, and big data platforms to architect scalable solutions.</li><li>Write reusable, testable, and efficient code that powers our web services and infrastructure.</li><li>Communicate effectively with stakeholders at all levels, ensuring alignment and understanding throughout the development process.</li></ul>We're looking for someone who <ul><li>Has 5+ years of experience in developing/architecting large-scale web services.</li><li>Holds a Bachelor's, Master's, or Ph.D. in Computer Science or related field.</li><li>Possesses expertise in databases, distributed systems, and backend performance measurement and optimization.</li><li>Has expert proficiency in Python or other programming languages such as Go, Java, or C++.</li><li>Has deep experience with web frameworks like Django and is familiar with MySQL, Redis, Elastic Search, Kafka, and Cassandra.</li><li>Demonstrates a solid understanding of database internals like transactions and indexes, with experience in database schema design.</li><li>Has hands-on experience working on AWS.</li><li>Is eager to take ownership and drive impact, owning projects from conception to implementation.</li><li>Brings substantial production server experience or equivalent expertise.</li><li>Strong communication skills, genuine curiosity, and meticulous attention to detail.</li></ul>Nice to haves <ul><li>A good understanding of HTTP and networking principles.</li><li>Familiarity with operating systems, particularly Linux.</li></ul>About Otter.ai We are in the business of shaping the future of work. Our mission is to make conversations more valuable. With over 1B meetings transcribed, Otter.ai is the world's leading tool for meeting transcription, summarization, and collaboration. Using artificial intelligence, Otter generates real-time automated meeting notes, summaries, and other insights from in-person and virtual meetings - turning meetings into accessible, collaborative, and actionable data that can be shared across teams and organizations. The company is backed by early investors in Google, DeepMind, Zoom, and Tesla. Otter.ai is an equal opportunity employer. We proudly celebrate diversity and are dedicated to inclusivity. *Otter.ai does not accept unsolicited resumes from 3rd party recruitment agencies without a written agreement in place for permanent placements. Any resume or other candidate information submitted outside of established candidate submission guidelines (including through our website or via email to any Otter.ai employee) and without a written agreement otherwise will be deemed to be our sole property, and no fee will be paid should we hire the candidate. Salary range Salary Range: $185,000 to $210,000 USD per year. This salary range represents the low and high end of the estimated salary range for this position. The actual base salary offered for the role is dependent on several factors. Our base salary is just one component of a comprehensive total rewards package.

The Opportunity We are seeking a highly skilled and experienced Senior iOS Engineer to take full ownership of developing and enhancing our consumer mobile app on the iOS platform. In this role, you will work closely with a collaborative engineering team and cross-functional partners, including AI experts and product managers, to design, build, and scale innovative solutions for end users and enterprise clients across various industries. As a Senior iOS Engineer, you'll have the opportunity to lead key initiatives, contribute to the entire product lifecycle, and see your ideas come to life in a fast-paced, dynamic environment. This is a unique chance to make a significant impact on a product that serves a wide range of professionals, shaping its future direction and success We're looking for someone who <ul><li>5+ years of experience in developing iOS apps with Objective-C and Swift</li><li>Experience in the entire development lifecycle for shipping consumer-facing apps on the App Store </li><li>Strong understanding and experience in concurrency, memory management, and network communication on iOS devices </li><li>Passion to build best-in-class user interface on mobile apps</li><li>Ability to communicate effectively with colleagues on feature requirements and technical problems</li><li>BS or MS in computer science or related field</li><li>Knowledge of backend API development is preferred </li></ul>About Otter.ai We are in the business of shaping the future of work. Our mission is to make conversations more valuable. With over 1B meetings transcribed, Otter.ai is the world's leading tool for meeting transcription, summarization, and collaboration. Using artificial intelligence, Otter generates real-time automated meeting notes, summaries, and other insights from in-person and virtual meetings - turning meetings into accessible, collaborative, and actionable data that can be shared across teams and organizations. The company is backed by early investors in Google, DeepMind, Zoom, and Tesla. Otter.ai is an equal opportunity employer. We proudly celebrate diversity and are dedicated to inclusivity. *Otter.ai does not accept unsolicited resumes from 3rd party recruitment agencies without a written agreement in place for permanent placements. Any resume or other candidate information submitted outside of established candidate submission guidelines (including through our website or via email to any Otter.ai employee) and without a written agreement otherwise will be deemed to be our sole property, and no fee will be paid should we hire the candidate. Salary range Salary Range: $185,000 to $210,000 USD per year. This salary range represents the low and high end of the estimated salary range for this position. The actual base salary offered for the role is dependent on several factors. Our base salary is just one component of a comprehensive total rewards package.

Who we are At City Storage Systems, we're building Infrastructure for Better Food. We help restaurateurs around the world succeed in online food delivery. Our goal is to make food more affordable, higher quality, and convenient for everyone. We're changing the game for restaurateurs, whether they're entrepreneurs opening their first restaurant all the way through to your favorite global quick-service restaurant chains. What you'll do As a Software Engineer at CSS, you'll be an integral part of our data-driven development team, contributing to the evolution of cutting-edge internal tools. Your role will encompass a diverse range of responsibilities, including: <ul><li>Data-Driven Development: Contribute to a data-centric development team. </li><li>Project Planning: Engage in strategic planning for various internal tools. </li><li>Agile Methodologies: Implement and test software using agile methodologies. </li><li>Collaborative Teamwork: Work closely with a collaborative team to enhance and support technology. </li><li>Code Contribution: Write, debug, maintain, and test code for diverse projects. </li><li>Architectural Design: Design scalable systems with a focus on architecture. </li><li>Continuous Improvement: Actively participate in and contribute to continuous improvement initiatives. </li><li>Innovation: Drive innovation within the team and support CSS' technological advancements. </li><li>Full Stack Development: Willing to switch between our java based backend services and frontend implementation based on the needs of the project. </li></ul>What the team focuses on Otter offers a wide range of software and hardware solutions for restaurants. Some examples include unifying all orders across platforms (Uber Eats, Doordash etc), QR code ordering, POS, Kiosk, printers etc. The wide range of products brings an interesting set of complexity in terms of discovery and set up. You will be a part of the Otter Engineering team focussed on building products for our internal ops users across sales, onboarding, customer success and external customers as they go through the experience of discovering, purchasing, onboarding and upselling onto different products that Otter has to offer. We are a full stack team of frontend and backend engineers, designers and a PM on a mission to offer the best experience for our customers to discover and onboard onto Otter product suite. What we're looking for <ul> <li>Education: Bachelor's Degree in Computer Science, Software Engineering, Mathematics, Computer Software, Computer Systems or Networks Engineering, Engineering, or a related technical field. </li><li>Experience: 3-7 years of domain experience in the specified role. </li><li>Individual Contribution: A track record of significant contributions in previous roles, showcasing your ability to make a meaningful impact. </li><li>Strong ability to design and create long-lasting architecture from scratch and evolve existing systems. </li><li>Strong communication and presentation skills. Ability to collaborate with non engineering stakeholders. </li> <li>Expertice with Java/GO (Backend development) </li><li>React.js or similar framworks </li><li>Knoledge in data analytics or data dashboards would be great </li></ul>Why join us <ul> <li>Growing market: You'll be focused on an $80 billion market projected to reach at least $500 billion by 2030 in the US alone. </li> <li>Changing the restaurant industry: You'll be part of a team that helps restaurants succeed in online food delivery. </li> <li>Collaborative environment: You will receive support and guidance from experienced colleagues and managers, helping you to learn, grow, and achieve your goals, and you'll work closely with other teams to ensure our customer's success. </li></ul> What else you need to know This role is based in our Seattle office location. We believe that people do their best work when they are together. As a company, we're in the marketplace of ideas and innovation. When you're constantly innovating, changing how an industry works, inventing new products and processes - and we are doing all these things - we believe we're better as a team in person. That's why all of our teams (except for our field-based roles) are now working from one of our office locations 5 days a week. Looking forward to sharing more about a Career of Substance at CSS! Ready to join us as we serve those who serve others? #LI-Onsite

Who we are At City Storage Systems, we're building Infrastructure for Better Food. We help restaurateurs around the world succeed in online food delivery. Our goal is to make food more affordable, higher quality, and convenient for everyone. We're changing the game for restaurateurs, whether they're entrepreneurs opening their first restaurant all the way through to your favorite global quick-service restaurant chains. What you'll do As a Software Engineer at CSS, you'll be an integral part of our data-driven development team, contributing to the evolution of cutting-edge internal tools. Your role will encompass a diverse range of responsibilities, including: <ul><li>Data-Driven Development: Contribute to a data-centric development team. </li><li>Project Planning: Engage in strategic planning for various internal tools. </li><li>Agile Methodologies: Implement and test software using agile methodologies. </li><li>Collaborative Teamwork: Work closely with a collaborative team to enhance and support technology. </li><li>Code Contribution: Write, debug, maintain, and test code for diverse projects. </li><li>Architectural Design: Design scalable systems with a focus on architecture. </li><li>Continuous Improvement: Actively participate in and contribute to continuous improvement initiatives. </li><li>Innovation: Drive innovation within the team and support CSS' technological advancements. </li><li>Full Stack Development: Willing to switch between our java based backend services and frontend implementation based on the needs of the project. </li></ul>What the team focuses on Otter offers a wide range of software and hardware solutions for restaurants. Some examples include unifying all orders across platforms (Uber Eats, Doordash etc), QR code ordering, POS, Kiosk, printers etc. The wide range of products brings an interesting set of complexity in terms of discovery and set up. You will be a part of the Otter Engineering team focussed on building products for our internal ops users across sales, onboarding, customer success and external customers as they go through the experience of discovering, purchasing, onboarding and upselling onto different products that Otter has to offer. We are a full stack team of frontend and backend engineers, designers and a PM on a mission to offer the best experience for our customers to discover and onboard onto Otter product suite. What we're looking for <ul> <li>Education: Bachelor's Degree in Computer Science, Software Engineering, Mathematics, Computer Software, Computer Systems or Networks Engineering, Engineering, or a related technical field. </li><li>Experience: 5-8 years of domain experience in the specified role. </li><li>Individual Contribution: A track record of significant contributions in previous roles, showcasing your ability to make a meaningful impact. </li><li>Strong ability to design and create long-lasting architecture from scratch and evolve existing systems. </li><li>Strong communication and presentation skills. Ability to collaborate with non engineering stakeholders. </li> <li>Expertice with Java/GO (Backend development) </li><li>React.js or similar framworks </li><li>Knoledge in data analytics or data dashboards would be great </li></ul>Why join us <ul> <li>Growing market: You'll be focused on an $80 billion market projected to reach at least $500 billion by 2030 in the US alone. </li> <li>Changing the restaurant industry: You'll be part of a team that helps restaurants succeed in online food delivery. </li> <li>Collaborative environment: You will receive support and guidance from experienced colleagues and managers, helping you to learn, grow, and achieve your goals, and you'll work closely with other teams to ensure our customer's success. </li></ul> What else you need to know This role is based in our Seattle office location. We believe that people do their best work when they are together. As a company, we're in the marketplace of ideas and innovation. When you're constantly innovating, changing how an industry works, inventing new products and processes - and we are doing all these things - we believe we're better as a team in person. That's why all of our teams (except for our field-based roles) are now working from one of our office locations 5 days a week. Looking forward to sharing more about a Career of Substance at CSS! Ready to join us as we serve those who serve others? #LI-Onsite

The Opportunity

We're seeking a talented Staff Engineer to join our Frontend Team. In this role, the person will shape and drive feature development while collaborating with key stakeholders across our organization. We're looking for someone who can provide technical leadership on enhancing performance, infrastructure, and overall user experience. If you're an innovative thinker who loves bringing ideas to life, this role is for you.

Your Impact

Lead in the development of our web app where you will be responsible for designing and shaping our current web application to be a more responsive, mobile-first single-page app
Write clean, maintainable, and reusable code that adheres to code standards
Discover and fix bugs
Test and evaluate the app for security and performance pitfalls
Validate /test for cross-browser/platform/device compatibility
Research solutions
Participate in code standards and lead code reviews

We're Looking For Someone Who

8+ years of experience developing and architecting single-page web apps using a JavaScript framework
Exceptional capability building websites that adhere to mobile-first functionality
Expert level proficiency in writing clean, reusable, optimized HTML/CSS, Typescript and JavaScript
Deep proficiency with Angular 2+
Good familiarity with HTTP protocol
Deep experience writing unit, integration, and UI tests and a strong ability to debug code that is reusable, testable and efficient.
Proven track record staying on top of the latest development tools and platforms
Experience with WebSockets is a plus
Familiar with Linux. Experience with AWS environment is preferred
Bachelor's degree in computer science or related field, Masters degree is a plus

About Otter.ai

We are in the business of shaping the future of work. Our mission is to make conversations more valuable.

With over 1B meetings transcribed, Otter.ai is the world’s leading tool for meeting transcription, summarization, and collaboration. Using artificial intelligence, Otter generates real-time automated meeting notes, summaries, and other insights from in-person and virtual meetings - turning meetings into accessible, collaborative, and actionable data that can be shared across teams and organizations. The company is backed by early investors in Google, DeepMind, Zoom, and Tesla.

Otter.ai is an equal opportunity employer. We proudly celebrate diversity and are dedicated to inclusivity.

Otter.ai does not accept unsolicited resumes from 3rd party recruitment agencies without a written agreement in place for permanent placements. Any resume or other candidate information submitted outside of established candidate submission guidelines (including through our website or via email to any Otter.ai employee) and without a written agreement otherwise will be deemed to be our sole property, and no fee will be paid should we hire the candidate.

Salary range

Salary Range: $210,000 to $250,000 USD per year.

This salary range represents the low and high end of the estimated salary range for this position. The actual base salary offered for the role is dependent on several factors. Our base salary is just one component of a comprehensive total rewards package.
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