Prepare for and practice interview questions from Gemini.

Gemini Interview Questions

Gemini Interview Guides

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?

Gemini Salaries by Position

About the Company Gemini is a global crypto and Web3 platform founded by Tyler Winklevoss and Cameron Winklevoss in 2014. Gemini offers a wide range of crypto products and services for individuals and institutions in over 70 countries. Crypto is about giving you greater choice, independence, and opportunity. We are here to help you on your journey. We build crypto products that are simple, elegant, and secure. Whether you are an individual or an institution, we help you buy, sell, and store your bitcoin and cryptocurrency. At Gemini, our mission is to unlock the next era of financial, creative, and personal freedom. In the United States, we have a flexible hybrid work policy for employees who live within 30 miles of our office headquartered in New York City and our office in Seattle. Employees within the New York and Seattle metropolitan areas are expected to work from the designated office twice a week, unless there is a job-specific requirement to be in the office every workday. Employees outside of these areas are considered part of our remote-first workforce. We believe our hybrid approach for those near our NYC and Seattle offices increases productivity through more in-person collaboration where possible. The Department: Acquisition & Activation The Role: Senior Software Engineer (Frontend) As a Senior Frontend Engineer, you'll work with a cross-functional team of web, mobile, and backend engineers to help solve complex problems that will directly influence the direction of the digital asset space. As part of this role, you'll help drive customer experience improvements to set us apart in the industry and build a world-class crypto exchange. If you get excited about solving technical challenges that directly impact our customers, clients, and the rest of the Gemini team, we'd love to hear from you. Responsibilities: <ul><li>Lead the design and development of high-quality features on the Gemini platform, collaborating closely with product managers, designers, and other engineers.</li><li>Architect and build efficient, reusable UI components and solutions that are reliable, performant, and maintainable.</li><li>Review and provide constructive feedback on code written by other engineers, ensuring correctness, style consistency, and security best practices.</li><li>Own and drive the DevOps lifecycle for products, ensuring high-quality delivery and maintenance throughout the product's lifetime.</li><li>Provide technical leadership and guidance during the planning, design, and requirements phases for new products and features.</li><li>Mentor junior engineers and foster a culture of continuous improvement and technical excellence within the team.</li></ul> Minimum Qualifications: <ul><li>5+ years of experience building consumer-facing web applications at scale.</li><li>Proficiency in JavaScript/TypeScript and deep experience with React.js.</li><li>Experience integrating and interacting with content management systems (CMS) like Contentful and Builder.io.</li><li>In-depth knowledge of web best practices, with a proactive approach to staying informed about industry innovations.</li><li>Strong understanding of UX/UI principles, with a demonstrated ability to influence design and product decisions.</li><li>Proven ability to work collaboratively across teams and time zones, managing dependencies and guiding projects to successful outcomes.</li><li>A customer and product-focused mindset, capable of making well-reasoned tradeoffs between speed and quality.</li><li>Ability to handle and prioritize multiple competing tasks effectively, with a focus on delivering high-impact solutions.</li></ul> Preferred Qualifications: <ul><li>Expertise in unit and integration testing, with a strong emphasis on ensuring code quality.</li><li>Experience using performance analysis tools to optimize frontend performance.</li><li>A track record of influencing product decisions through data-driven insights.</li><li>Experience working with experimentation frameworks and tools.</li><li>Experience integrating and maintaining analytics tools and events. </li><li>Familiarity with crypto products as a user, with a strong interest in the space.</li><li>Experience with mobile development using React Native or interest in learning.</li></ul> It Pays to Work Here The compensation & benefits package for this role includes: <ul><li>Competitive starting salary</li><li>A discretionary annual bonus</li><li>Long-term incentive in the form of a new hire equity grant</li><li>Comprehensive health plans</li><li>401K with company matching</li><li>Paid Parental Leave</li><li>Flexible time off</li></ul> Salary Range: The base salary range for this role is between $152,000 - $190,000 in the State of New York, the State of California and the State of Washington. This range is not inclusive of our discretionary bonus or equity package. When determining a candidate's compensation, we consider a number of factors including skillset, experience, job scope, and current market data. At Gemini, we strive to build diverse teams that reflect the people we want to empower through our products, and we are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, or Veteran status. Equal Opportunity is the Law, and Gemini is proud to be an equal opportunity workplace. If you have a specific need that requires accommodation, please let a member of the People Team know. #LI-AA1

About the Company Gemini is a global crypto and Web3 platform founded by Tyler Winklevoss and Cameron Winklevoss in 2014. Gemini offers a wide range of crypto products and services for individuals and institutions in over 70 countries. Crypto is about giving you greater choice, independence, and opportunity. We are here to help you on your journey. We build crypto products that are simple, elegant, and secure. Whether you are an individual or an institution, we help you buy, sell, and store your bitcoin and cryptocurrency. At Gemini, our mission is to unlock the next era of financial, creative, and personal freedom. In the United States, we have a flexible hybrid work policy for employees who live within 30 miles of our office headquartered in New York City and our office in Seattle. Employees within the New York and Seattle metropolitan areas are expected to work from the designated office twice a week, unless there is a job-specific requirement to be in the office every workday. Employees outside of these areas are considered part of our remote-first workforce. We believe our hybrid approach for those near our NYC and Seattle offices increases productivity through more in-person collaboration where possible. The Department: Acquisition & Activation The Role: Staff Software Engineer As an engineer at Gemini, you'll be directly involved in collecting, storing, and verifying the identity information of all users of Gemini. We are building a cross-functional, microservice based platform to support the login and registration processes across all of Gemini's current and future product lines. We are a primarily backend team working in scala. We have a strong culture of code reviews, and a focus on security, with the end goal of writing and shipping high-quality code by getting things right the first time. We want to continue building the best product we can as we scale and grow our business. If you get excited about solving technical challenges that directly impact our customers, clients, and the rest of the Gemini team, we'd love to hear from you. Responsibilities: <ul> <li>Lead the technical side of the planning, design, and requirements process for new products and features. </li><li>Review fellow software engineers' code for correctness, style, and information security concerns. Provide constructive feedback, guidance, and mentorship to more junior team members. </li><li>Constantly look to improve the performance, maintainability, and operations of the Gemini codebase by via refactoring and upgrade projects. </li><li>Drive operational excellence by improving the instrumentation, monitoring, and alerting of your team's production software. </li><li>Exhibit excellent verbal and written communications skills with the ability to work closely across teams, time zones, and dependencies. </li><li>Demonstrate sound business judgment, with a proven ability to influence others and make excellent business and technical decisions. </li><li>Always keep our end customer in mind when making any decision. </li></ul>Minimum Qualifications: <ul> <li>At least 8 years of software engineering experience. </li><li>Advanced proficiency with the JVM (Scala preferred). </li><li>Familiarity with functional programming paradigms. </li><li>The ability to adapt and handle multiple competing priorities in collaboration with peers. </li><li>A customer and product-focused mindset, with the ability to make well-reasoned tradeoffs between speed and quality. </li><li>Demonstrated ability to lead the design and development of complex, innovative software solutions. </li><li>A history of designing, building, and working with distributed systems. </li><li>Experience building highly observable, well monitored software. </li></ul>Preferred Qualifications: <ul> <li>Familiarity with AWS cloud infrastructure. </li><li>Experience working with event driven architectures and messaging protocols. </li><li>Prior experience working with gRPC and/or protobuf. </li></ul>It Pays to Work Here The compensation & benefits package for this role includes: <ul> <li>Competitive starting salary </li><li>A discretionary annual bonus </li><li>Long-term incentive in the form of a new hire equity grant </li><li>Comprehensive health plans </li><li>401K with company matching </li><li>Paid Parental Leave </li><li>Flexible time off </li></ul> Salary Range: The base salary range for this role is between $172,000 - $215,000 in the State of New York, the State of California and the State of Washington. This range is not inclusive of our discretionary bonus or equity package. When determining a candidate's compensation, we consider a number of factors including skillset, experience, job scope, and current market data. At Gemini, we strive to build diverse teams that reflect the people we want to empower through our products, and we are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, or Veteran status. Equal Opportunity is the Law, and Gemini is proud to be an equal opportunity workplace. If you have a specific need that requires accommodation, please let a member of the People Team know. #LI-AA1

About the Company Gemini is a global crypto and Web3 platform founded by Tyler Winklevoss and Cameron Winklevoss in 2014. Gemini offers a wide range of crypto products and services for individuals and institutions in over 70 countries. Crypto is about giving you greater choice, independence, and opportunity. We are here to help you on your journey. We build crypto products that are simple, elegant, and secure. Whether you are an individual or an institution, we help you buy, sell, and store your bitcoin and cryptocurrency. At Gemini, our mission is to unlock the next era of financial, creative, and personal freedom. In the United States, we have a flexible hybrid work policy for employees who live within 30 miles of our office headquartered in New York City and our office in Seattle. Employees within the New York and Seattle metropolitan areas are expected to work from the designated office twice a week, unless there is a job-specific requirement to be in the office every workday. Employees outside of these areas are considered part of our remote-first workforce. We believe our hybrid approach for those near our NYC and Seattle offices increases productivity through more in-person collaboration where possible. The Department: Acquisition & Activation The Role: Senior Software Engineer (Fullstack) As a Senior Fullstack Software Engineer, you'll work across all layers of our tech stack to build out products that drive our marketing efforts, including promotions, referrals, analytics, and traffic attribution. You will collaborate with a cross-functional team to deliver high-quality features that enhance our product offerings. This role requires a strong foundation in both frontend and backend technologies, specifically TypeScript and React on the frontend, and Scala (or other JVM languages) on the backend. Responsibilities: <ul><li>Collaborate with product managers, designers, and other engineers to design and deliver high-quality features across our marketing platforms.</li><li>Build efficient and reusable UI components and architect reliable, performant, and maintainable solutions for both the frontend and backend.</li><li>Write clean, efficient, and well-documented code. Review other software engineers' code for correctness, style, and security.</li><li>Own the DevOps lifecycle for a product, including building, validating, and maintaining high-quality products throughout their lifecycle.</li><li>Continuously improve the performance, maintainability, and operations of our codebase by engaging in refactoring, optimization, and upgrade projects.</li></ul> Minimum Qualifications: <ul><li>At least 6 years of experience in full-stack development, with a strong focus on building consumer-facing web applications at scale.</li><li>Proficiency in React.js and JavaScript/TypeScript, CSS, with a deep understanding of modern web development best practices.</li><li>Strong experience with Java or Scala and familiarity with building microservices in cloud environments (e.g., AWS, Azure).</li><li>Experience working and integrating with content management systems (CMS) like Contentful or Builder.io.</li><li>The ability to work closely across teams (and time zones) and manage dependencies effectively.</li><li>A customer and product-focused mindset, with the ability to make well-reasoned trade-offs between speed and quality.</li><li>The ability to adapt and handle multiple competing priorities in collaboration with peers.</li></ul> Preferred Qualifications: <ul><li>Experience as a project and technical lead. </li><li>Experience working with Next.js.</li><li>Experience with Scala or a willingness to learn, as our backend is primarily built in Scala.</li><li>Expertise in unit and integration testing to ensure the reliability and stability of delivered features.</li><li>Experience with performance analysis tooling and techniques.</li><li>Experience influencing product decisions through data and experimentation.</li><li>Knowledge of the finance industry, payments, trading, or exchange systems.</li><li>Hands-on experience with DevOps practices, including CI/CD pipelines and cloud-based infrastructure management.</li></ul> It Pays to Work Here The compensation & benefits package for this role includes: <ul><li>Competitive starting salary</li><li>A discretionary annual bonus</li><li>Long-term incentive in the form of a new hire equity grant</li><li>Comprehensive health plans</li><li>401K with company matching</li><li>Paid Parental Leave</li><li>Flexible time off</li></ul> Salary Range: The base salary range for this role is between $152,000 - $190,000 in the State of New York, the State of California and the State of Washington. This range is not inclusive of our discretionary bonus or equity package. When determining a candidate's compensation, we consider a number of factors including skillset, experience, job scope, and current market data. At Gemini, we strive to build diverse teams that reflect the people we want to empower through our products, and we are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, or Veteran status. Equal Opportunity is the Law, and Gemini is proud to be an equal opportunity workplace. If you have a specific need that requires accommodation, please let a member of the People Team know. #LI-GR1

About the Company Gemini is a global crypto and Web3 platform founded by Tyler Winklevoss and Cameron Winklevoss in 2014. Gemini offers a wide range of crypto products and services for individuals and institutions in over 70 countries. Crypto is about giving you greater choice, independence, and opportunity. We are here to help you on your journey. We build crypto products that are simple, elegant, and secure. Whether you are an individual or an institution, we help you buy, sell, and store your bitcoin and cryptocurrency. At Gemini, our mission is to unlock the next era of financial, creative, and personal freedom. In the United States, we have a flexible hybrid work policy for employees who live within 30 miles of our office headquartered in New York City and our office in Seattle. Employees within the New York and Seattle metropolitan areas are expected to work from the designated office twice a week, unless there is a job-specific requirement to be in the office every workday. Employees outside of these areas are considered part of our remote-first workforce. We believe our hybrid approach for those near our NYC and Seattle offices increases productivity through more in-person collaboration where possible. The Department: Acquisition & Activation The Role: Staff Software Engineer As an engineer at Gemini, you'll be directly involved in collecting, storing, and verifying the identity information of all users of Gemini. We are building a cross-functional, microservice based platform to support the login and registration processes across all of Gemini's current and future product lines. We are a primarily backend team working in scala. We have a strong culture of code reviews, and a focus on security, with the end goal of writing and shipping high-quality code by getting things right the first time. We want to continue building the best product we can as we scale and grow our business. If you get excited about solving technical challenges that directly impact our customers, clients, and the rest of the Gemini team, we'd love to hear from you. Responsibilities: <ul><li>Lead the technical side of the planning, design, and requirements process for new products and features.</li><li>Review fellow software engineers' code for correctness, style, and information security concerns. Provide constructive feedback, guidance, and mentorship to more junior team members.</li><li>Constantly look to improve the performance, maintainability, and operations of the Gemini codebase by via refactoring and upgrade projects.</li><li>Drive operational excellence by improving the instrumentation, monitoring, and alerting of your team's production software.</li><li>Exhibit excellent verbal and written communications skills with the ability to work closely across teams, time zones, and dependencies.</li><li>Demonstrate sound business judgment, with a proven ability to influence others and make excellent business and technical decisions.</li><li>Always keep our end customer in mind when making any decision.</li></ul> Minimum Qualifications: <ul><li>At least 8 years of software engineering experience.</li><li>Advanced proficiency with the JVM (Scala preferred).</li><li>Familiarity with functional programming paradigms.</li><li>The ability to adapt and handle multiple competing priorities in collaboration with peers.</li><li>A customer and product-focused mindset, with the ability to make well-reasoned tradeoffs between speed and quality.</li><li>Demonstrated ability to lead the design and development of complex, innovative software solutions.</li><li>A history of designing, building, and working with distributed systems.</li><li>Experience building highly observable, well monitored software.</li></ul> Preferred Qualifications: <ul><li>Familiarity with AWS cloud infrastructure.</li><li>Experience working with event driven architectures and messaging protocols.</li><li>Prior experience working with gRPC and/or protobuf.</li></ul> It Pays to Work Here The compensation & benefits package for this role includes: <ul><li>Competitive starting salary</li><li>A discretionary annual bonus</li><li>Long-term incentive in the form of a new hire equity grant</li><li>Comprehensive health plans</li><li>401K with company matching</li><li>Paid Parental Leave</li><li>Flexible time off</li></ul> Salary Range: The base salary range for this role is between $172,000 - $215,000 in the State of New York, the State of California and the State of Washington. This range is not inclusive of our discretionary bonus or equity package. When determining a candidate's compensation, we consider a number of factors including skillset, experience, job scope, and current market data. At Gemini, we strive to build diverse teams that reflect the people we want to empower through our products, and we are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, or Veteran status. Equal Opportunity is the Law, and Gemini is proud to be an equal opportunity workplace. If you have a specific need that requires accommodation, please let a member of the People Team know. #LI-AA1

About the Company Gemini is a global crypto and Web3 platform founded by Tyler Winklevoss and Cameron Winklevoss in 2014. Gemini offers a wide range of crypto products and services for individuals and institutions in over 70 countries. Crypto is about giving you greater choice, independence, and opportunity. We are here to help you on your journey. We build crypto products that are simple, elegant, and secure. Whether you are an individual or an institution, we help you buy, sell, and store your bitcoin and cryptocurrency. At Gemini, our mission is to unlock the next era of financial, creative, and personal freedom. In the United States, we have a flexible hybrid work policy for employees who live within 30 miles of our office headquartered in New York City and our office in Seattle. Employees within the New York and Seattle metropolitan areas are expected to work from the designated office twice a week, unless there is a job-specific requirement to be in the office every workday. Employees outside of these areas are considered part of our remote-first workforce. We believe our hybrid approach for those near our NYC and Seattle offices increases productivity through more in-person collaboration where possible. The Department: Acquisition & Activation The Role: Software Engineer (Mobile) Our mobile engineers are experts at making Gemini's mission clear and accessible to our customers through intelligent development of well-designed visual elements. An ideal candidate will have a strong aptitude for identifying opportunities to improve user experience, experience translating design frameworks into code to improve the Gemini mobile app, and a proactive desire to collaborate with fellow developers, designers, and marketing managers to present a shared artistic vision. Responsibilities: <ul><li>Focus on leading technical decision making building highly complex, highly trafficked, consumer facing web services</li><li>Build elegant and efficient maintainable solutions in React Native</li><li>Collaborate with product managers, designers, and backend engineers to design and deliver high-quality products on iOS and Android</li><li>Act as the go-to expert in with an increasingly strategic mindset</li><li>Drive technical innovation, processes, and best practices required to deliver best-in-class mobile applications</li><li>Lead and mentor a high-performing team of engineers</li></ul> Minimum Qualifications: <ul><li>You have 2+ years of React Native experience </li><li>You have 4+ years of frontend/mobile development experience</li><li>You are comfortable working with Typescript and/or Javascript, but also not afraid to jump into Swift or Kotlin as needed</li><li>You have a strong understanding of UX/UI concepts and a demonstrated record of design sensibility</li><li>You have knowledge of mobile best practices and stay informed about innovations in the mobile industry</li><li>You have experience writing unit tests with Jest and React Native Testing Library</li></ul> Preferred Qualifications: <ul><li>Experience working with Bitcoin, Ethereum, and/or blockchain technology a huge plus</li><li>Experience with using Storybook for UI component documentation</li><li>Experience with React Native Reanimated</li><li>Knowledge of unit and integration testing</li><li>Knowledge of accessibility best practices</li><li>Able to change direction quickly based on shifting company needs</li></ul> It Pays to Work Here The compensation & benefits package for this role includes: <ul><li>Competitive starting salary</li><li>A discretionary annual bonus</li><li>Long-term incentive in the form of a new hire equity grant</li><li>Comprehensive health plans</li><li>401K with company matching</li><li>Paid Parental Leave</li><li>Flexible time off</li></ul> Salary Range: The base salary range for this role is between $120,000 - $150,000 in the State of New York, the State of California and the State of Washington. This range is not inclusive of our discretionary bonus or equity package. When determining a candidate's compensation, we consider a number of factors including skillset, experience, job scope, and current market data. At Gemini, we strive to build diverse teams that reflect the people we want to empower through our products, and we are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, or Veteran status. Equal Opportunity is the Law, and Gemini is proud to be an equal opportunity workplace. If you have a specific need that requires accommodation, please let a member of the People Team know. #LI-AA1

Gemini Interview Questions

Gemini Interview Guides

Gemini Interview Questions

Gemini Salaries by Position

Gemini Opening Jobs