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Fastly Interview Questions

Fastly Interview Guides

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

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 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

Fastly Salaries by Position

Fastly helps people stay better connected with the things they love. Fastly’s edge cloud platform enables customers to create great digital experiences quickly, securely, and reliably by processing, serving, and securing our customers’ applications as close to their end-users as possible — at the edge of the Internet. The platform is designed to take advantage of the modern internet, to be programmable, and to support agile software development. Fastly’s customers include many of the world’s most prominent companies, including Vimeo, Pinterest, The New York Times, and GitHub.
We're building a more trustworthy Internet. Come join us.
Please note: You MUST CURRENTLY reside within a commutable distance to Culver City to be considered for this position. We will not be considering candidates who require relocation.
Join our growing Security Products group, where we're dedicated to creating cutting-edge security solutions that protect a significant portion of the internet. As part of our team, you'll have the opportunity to lead a talented group of Software Engineers and Data experts as we expand our security offerings. We're seeking an experienced Senior Engineering Manager who can drive innovation and growth through our anti-automation and anti-fraud products. Your role will be pivotal in accelerating product development, improving performance, and enhancing user experience across our security solutions.
What You'll Do Build, mentor, and grow a distributed team of Software Engineers and technical leaders responsible for building and maintaining the products our customers rely on to secure their web applications.
Empower a team of engineers with varying levels of expertise and demonstrated ability to achieve a high level of technical efficiency, reliability, and simplicity.
Partner with Product Management and Program Management to prioritize and plan projects.
What We're Looking For You have a minimum of 12 years of hands-on engineering experience with at least 4 of those years in a direct management role.
You have at least 3 years of experience in directly managing a distributed team.
Experience leading and effectively executing a high growth team.
We’ll be super impressed if you have experience in any of these: Prior history working in the software security and web application industries.
Experience working with Fastly technologies.
High performance, large scale, or global multi-tenant systems.
Work Hours This position will require you to be available during core business hours.
Work Locations & Travel Requirements: This position is open to the following preferred office locations:
San Francisco, CA
Los Angeles, CA
Denver, CO
New York, NY
Fastly currently embraces a largely hybrid model for most roles which allows employees flexibility to split their time between the office and home.
Salary The estimated salary range for this position is $195,720 to $244,640. Starting salary may vary based on permissible, non-discriminatory factors such as experience, skills, qualifications, and location. This role may be eligible to participate in Fastly’s equity and discretionary bonus programs.
Benefits We care about you. Fastly works hard to create a positive environment for our employees, and we think your life outside of work is important too. We support our teams with great benefits that start on the first day of your employment with Fastly. Curious about our offerings?
We offer a comprehensive benefits package including medical, dental, and vision insurance. Family planning, mental health support along with Employee Assistance Program, Insurance (Life, Disability, and Accident), a Flexible Vacation policy and up to 18 days of accrued paid sick leave are there to help support our employees. We also offer 401(k) (including company match) and an Employee Stock Purchase Program. For 2024, we offer 10 paid local holidays, 11 paid company wellness days.
Why Fastly? We have a huge impact. Fastly is a small company with a big reach. Not only do our customers have a tremendous user base, but we also support a growing number of open source projects and initiatives. Outside of code, employees are encouraged to share causes close to their heart with others so we can help lend a supportive hand.
We love distributed teams. Fastly’s home-base is in San Francisco, but we have multiple offices and employees sprinkled around the globe. As a new hire, you will be able to attend our IN-PERSON new hire orientation in our San Francisco office! It is an exciting week-long experience that we offer to new employees to build connections with colleagues across Fastly, participate in hands-on learning opportunities, and immerse yourself in our culture firsthand.
We value diversity. Growing and maintaining our inclusive and diverse team matters to us. We are committed to being a company where our employees feel comfortable bringing their authentic selves to work and have the ability to be successful -- every day.
We are passionate. Fastly is chock full of passionate people and we’re not ‘one size fits all’. Fastly employs authors, pilots, skiers, parents (of humans and animals), makeup geeks, coffee connoisseurs, and more. We love employees for who they are and what they are passionate about.
We’re always looking for humble, sharp, and creative folks to join the Fastly team. If you think you might be a fit please apply!
A fully completed application and resume or CV are required when applying.
Fastly is committed to ensuring equal employment opportunity and to providing employees with a safe and welcoming work environment free of discrimination and harassment. Our employment decisions are based on business needs, job requirements and individual qualifications.
All qualified applicants will receive consideration for employment without regard to age, ancestry, color, family or medical care leave, gender identity or expression, genetic information, marital status, medical condition, national origin, family or parental status, physical or mental disability, political affiliation, protected veteran status, race, religion, sex (including pregnancy), sexual orientation, or any other characteristic protected by applicable laws, regulations and ordinances.
Consistent with the Americans with Disabilities Act (ADA) and federal or state disability laws, Fastly will provide reasonable accommodations for applicants and employees with disabilities. If reasonable accommodation is needed to participate in the job application or interview process, to perform essential job functions, and/or to receive other benefits and privileges of employment, please contact your Recruiter, or the Fastly Employee Relations team at candidateaccommodations@fastly.com or 501-287-4901.
Fastly collects and processes personal data submitted by job applicants in accordance with our Privacy Policy. Please see our privacy notice for job applicants.

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Fastly helps people stay better connected with the things they love. Fastly's edge cloud platform enables customers to create great digital experiences quickly, securely, and reliably by processing, serving, and securing our customers' applications as close to their end-users as possible - at the edge of the Internet. The platform is designed to take advantage of the modern internet, to be programmable, and to support agile software development. Fastly's customers include many of the world's most prominent companies, including Vimeo, Pinterest, The New York Times, and GitHub. We're building a more trustworthy Internet. Come join us. Posting Open Date: 7/12/24 Anticipated Posting Close Date*: 9/12/24 *Job posting may close early due to the volume of applicants. Staff Software Engineer, Bot Management and Anti-Fraud We are looking for a technical leader with experience in developing and growing bot management and anti-fraud capabilities. You will support the Security Product Engineering Organization to develop foundational technologies that power our existing and future bot-management and DDoS mitigation products. You will have the autonomy and support to experiment, improve and ultimately define the future of the systems you are responsible for. As a Security Product Engineering leader you will provide mentorship as well as help us shape patterns, standards, and methodologies for the whole department. What You'll Do: <ul><li>Develop, test, and maintain bot management and DDoS mitigation capabilities built on Fastly's globally distributed systems</li><li>Work with peers and Fastly product managers to identify and prioritize forward-looking bot-management, DDoS mitigation and related product features</li><li>Collaboratively steer Fastly's security product architecture </li><li>Integrate these capabilities tightly with other Fastly systems</li><li>Mentor teams in everything from data analysis to solving complex code issues</li><li>Anticipate the functionality, scalability, and performance needs of Security Product Engineering teams at Fastly</li></ul> What We're Looking For: <ul><li>You have a minimum of 5 years of software development experience with at least 2 of those years focused on coding primarily in Rust or Go, as well as experience with JavaScript</li><li>You have a history of technical leadership for highly scalable, reliable software systems</li><li>You have collaborated successfully with product development teams to deliver complex software products to market</li><li>Deep understanding of adversarial traffic classification, mitigation techniques, and associated ecosystems</li><li>Experience working with customer security operations teams</li></ul> We'll be super impressed if you have experience in any of these: <ul><li>Prior experience developing bot management or DDoS mitigation technology</li><li>Operational experience in bot-management or DDoS mitigation: data analysis, developing stream processing tools, and automating preventative measures</li><li>Understanding of the challenges involved in using, building, operating, and maintaining scalable and reliable distributed security systems</li></ul> Work Hours: This position will require you to be available during core business hours. Work Location(s) & Travel Requirements: This position is open to the following preferred office locations: <ul><li>New York City</li></ul> Fastly currently embraces a largely hybrid model for most roles which allows employees flexibility to split their time between the office and home. This position may require travel as required by your role or requested by your manager. Pursuant to the San Francisco Fair Chance Ordinance and the Los Angeles Fair Chance Initiative for Hiring Ordinance, we will consider for employment qualified applicants with arrest and conviction records. Salary: The estimated salary range for this position is $181,220 to $226,520. Starting salary may vary based on permissible, non-discriminatory factors such as experience, skills, qualifications, and location. This role may be eligible to participate in Fastly's equity and discretionary bonus programs. Benefits: We care about you. Fastly works hard to create a positive environment for our employees, and we think your life outside of work is important too. We support our teams with great benefits that start on the first day of your employment with Fastly. Curious about our offerings? We offer a comprehensive benefits package including medical, dental, and vision insurance. Family planning, mental health support along with Employee Assistance Program, Insurance (Life, Disability, and Accident), a Flexible Vacation policy and up to 18 days of accrued paid sick leave are there to help support our employees. We also offer 401(k) (including company match) and an Employee Stock Purchase Program. For 2024, we offer 10 paid local holidays, 11 paid company wellness days. Why Fastly? <ul><li>We have a huge impact. Fastly is a small company with a big reach. Not only do our customers have a tremendous user base, but we also support a growing number of open source projects and initiatives. Outside of code, employees are encouraged to share causes close to their heart with others so we can help lend a supportive hand.</li><li>We love distributed teams. Fastly's home-base is in San Francisco, but we have multiple offices and employees sprinkled around the globe. As a new hire, you will be able to attend our IN-PERSON new hire orientation in our San Francisco office! It is an exciting week-long experience that we offer to new employees to build connections with colleagues across Fastly, participate in hands-on learning opportunities, and immerse yourself in our culture firsthand.</li><li>We value diversity. Growing and maintaining our inclusive and diverse team matters to us. We are committed to being a company where our employees feel comfortable bringing their authentic selves to work and have the ability to be successfulevery day.</li><li>We are passionate. Fastly is chock full of passionate people and we're not 'one size fits all'. Fastly employs authors, pilots, skiers, parents (of humans and animals), makeup geeks, coffee connoisseurs, and more. We love employees for who they are and what they are passionate about.</li></ul> We're always looking for humble, sharp, and creative folks to join the Fastly team. If you think you might be a fit please apply! A fully completed application and resume or CV are required when applying. Fastly is committed to ensuring equal employment opportunity and to providing employees with a safe and welcoming work environment free of discrimination and harassment. Our employment decisions are based on business needs, job requirements and individual qualifications. All qualified applicants will receive consideration for employment without regard to age, ancestry, color, family or medical care leave, gender identity or expression, genetic information, marital status, medical condition, national origin, family or parental status, physical or mental disability, political affiliation, protected veteran status, race, religion, sex (including pregnancy), sexual orientation, or any other characteristic protected by applicable laws, regulations and ordinances. Consistent with the Americans with Disabilities Act (ADA) and federal or state disability laws, Fastly will provide reasonable accommodations for applicants and employees with disabilities. If reasonable accommodation is needed to participate in the job application or interview process, to perform essential job functions, and/or to receive other benefits and privileges of employment, please contact your Recruiter, or the Fastly Employee Relations team at candidateaccommodations@fastly.com or 501-287-4901. Fastly collects and processes personal data submitted by job applicants in accordance with our Privacy Policy. Please see our privacy notice for job applicants.

Fastly helps people stay better connected with the things they love. Fastly's edge cloud platform enables customers to create great digital experiences quickly, securely, and reliably by processing, serving, and securing our customers' applications as close to their end-users as possible - at the edge of the Internet. The platform is designed to take advantage of the modern internet, to be programmable, and to support agile software development. Fastly's customers include many of the world's most prominent companies, including Vimeo, Pinterest, The New York Times, and GitHub. We're building a more trustworthy Internet. Come join us. Posting Open Date: 6/7/24 Anticipated Posting Close Date*: 7/29/24 *Job posting may close early due to the volume of applicants. Senior Engineering Manager - WebAssembly The WebAssembly team is focused on the technology that powers Fastly's Compute platform, which is an advanced serverless platform built on open standards that runs code, in any preferred language, on our global edge network. It's designed to address the requirements of modern application development by empowering customers to run code in a highly secure execution environment with microsecond cold start times, at scale, on the edge. If you are a seasoned Engineering Leader and active member of open source runtime communities, this just may be your dream job! This team works with Bytecode Alliance on WebAssembly, as well as several other open source communities. What You'll Do: <ul><li>Lead a team of very senior and very talented developers who are truly experts in this field</li><li>Work closely across Fastly's engineering teams to facilitate effective communication and roadmapping</li></ul> What We're Looking For: <ul><li>You have a minimum of 12 years of engineering experience with at least 5 of those in a direct management role</li><li>You are familiar with runtimes (such as V8, SpiderMonkey, CoreCLR, or others), either low-level systems implementation or performance optimization</li><li>You have experience with engineering for scalability</li><li>You have experience with active Open Source communities</li></ul> We'll be super impressed if you have experience in any of these: <ul><li>Programming language design or implementation</li><li>You have experience with compiler development</li><li>You have experience with WebAssembly, especially with Wasmtime</li><li>You have extensive experience in leadership positions in active open source communities</li></ul> Work Hours: <ul><li>This position will require you to be available during core North American business hours, and available to support the team through incidents that require escalation.</li></ul> Work Location(s) & Travel Requirements: This position is a remote role and open to candidates residing in the following locations: USA This position may require travel as required by your role or requested by your manager. Pursuant to the San Francisco Fair Chance Ordinance and the Los Angeles Fair Chance Initiative for Hiring Ordinance, we will consider for employment qualified applicants with arrest and conviction records. Salary: The estimated salary range for this position is $195,720 - $244,645. Starting salary may vary based on permissible, non-discriminatory factors such as experience, skills, qualifications, and location. This role may be eligible to participate in Fastly's equity and discretionary bonus programs. Benefits: We care about you. Fastly works hard to create a positive environment for our employees, and we think your life outside of work is important too. We support our teams with great benefits that start on the first day of your employment with Fastly. Curious about our offerings? We offer a comprehensive benefits package including medical, dental, and vision insurance. Family planning, mental health support along with Employee Assistance Program, Insurance (Life, Disability, and Accident), a Flexible Vacation policy and up to 18 days of accrued paid sick leave are there to help support our employees. We also offer 401(k) (including company match) and an Employee Stock Purchase Program. For 2024, we offer 10 paid local holidays, 11 paid company wellness days. Why Fastly? <ul><li>We have a huge impact. Fastly is a small company with a big reach. Not only do our customers have a tremendous user base, but we also support a growing number of open source projects and initiatives. Outside of code, employees are encouraged to share causes close to their heart with others so we can help lend a supportive hand.</li><li>We love distributed teams. Fastly's home-base is in San Francisco, but we have multiple offices and employees sprinkled around the globe. As a new hire, you will be able to attend our IN-PERSON new hire orientation in our San Francisco office! It is an exciting week-long experience that we offer to new employees to build connections with colleagues across Fastly, participate in hands-on learning opportunities, and immerse yourself in our culture firsthand.</li><li>We value diversity. Growing and maintaining our inclusive and diverse team matters to us. We are committed to being a company where our employees feel comfortable bringing their authentic selves to work and have the ability to be successfulevery day.</li><li>We are passionate. Fastly is chock full of passionate people and we're not 'one size fits all'. Fastly employs authors, pilots, skiers, parents (of humans and animals), makeup geeks, coffee connoisseurs, and more. We love employees for who they are and what they are passionate about.</li></ul> We're always looking for humble, sharp, and creative folks to join the Fastly team. If you think you might be a fit please apply! A fully completed application and resume or CV are required when applying. Fastly is committed to ensuring equal employment opportunity and to providing employees with a safe and welcoming work environment free of discrimination and harassment. Our employment decisions are based on business needs, job requirements and individual qualifications. All qualified applicants will receive consideration for employment without regard to age, ancestry, color, family or medical care leave, gender identity or expression, genetic information, marital status, medical condition, national origin, family or parental status, physical or mental disability, political affiliation, protected veteran status, race, religion, sex (including pregnancy), sexual orientation, or any other characteristic protected by applicable laws, regulations and ordinances. Consistent with the Americans with Disabilities Act (ADA) and federal or state disability laws, Fastly will provide reasonable accommodations for applicants and employees with disabilities. If reasonable accommodation is needed to participate in the job application or interview process, to perform essential job functions, and/or to receive other benefits and privileges of employment, please contact your Recruiter, or the Fastly Employee Relations team at candidateaccommodations@fastly.com or 501-287-4901. Fastly collects and processes personal data submitted by job applicants in accordance with our Privacy Policy. Please see our privacy notice for job applicants.

Fastly helps people stay better connected with the things they love. Fastly's edge cloud platform enables customers to create great digital experiences quickly, securely, and reliably by processing, serving, and securing our customers' applications as close to their end-users as possible - at the edge of the Internet. The platform is designed to take advantage of the modern internet, to be programmable, and to support agile software development. Fastly's customers include many of the world's most prominent companies, including Vimeo, Pinterest, The New York Times, and GitHub.We're building a more trustworthy Internet. Come join us.Posting Open Date: 6/7/24Anticipated Posting Close Date*: 7/29/24*Job posting may close early due to the volume of applicants.Senior Engineering Manager - WebAssemblyThe WebAssembly team is focused on the technology that powers Fastly's Compute platform, which is an advanced serverless platform built on open standards that runs code, in any preferred language, on our global edge network. It's designed to address the requirements of modern application development by empowering customers to run code in a highly secure execution environment with microsecond cold start times, at scale, on the edge.If you are a seasoned Engineering Leader and active member of open source runtime communities, this just may be your dream job! This team works with Bytecode Alliance on WebAssembly, as well as several other open source communities. What You'll Do:Lead a team of very senior and very talented developers who are truly experts in this fieldWork closely across Fastly's engineering teams to facilitate effective communication and roadmappingWhat We're Looking For: You have a minimum of 12 years of engineering experience with at least 5 of those in a direct management roleYou are familiar with runtimes (such as V8, SpiderMonkey, CoreCLR, or others), either low-level systems implementation or performance optimizationYou have experience with engineering for scalabilityYou have experience with active Open Source communitiesWe'll be super impressed if you have experience in any of these:Programming language design or implementationYou have experience with compiler developmentYou have experience with WebAssembly, especially with WasmtimeYou have extensive experience in leadership positions in active open source communitiesWork Hours:This position will require you to be available during core North American business hours, and available to support the team through incidents that require escalation.Work Location(s) & Travel Requirements: This position is a remote role and open to candidates residing in the following locations: USAThis position may require travel as required by your role or requested by your manager.Pursuant to the San Francisco Fair Chance Ordinance and the Los Angeles Fair Chance Initiative for Hiring Ordinance, we will consider for employment qualified applicants with arrest and conviction records.Salary: The estimated salary range for this position is $195,720 - $244,645.Starting salary may vary based on permissible, non-discriminatory factors such as experience, skills, qualifications, and location.This role may be eligible to participate in Fastly's equity and discretionary bonus programs.Benefits: We care about you. Fastly works hard to create a positive environment for our employees, and we think your life outside of work is important too. We support our teams with great benefits that start on the first day of your employment with Fastly. Curious about our offerings? We offer a comprehensive benefits package including medical, dental, and vision insurance. Family planning, mental health support along with Employee Assistance Program, Insurance (Life, Disability, and Accident), a Flexible Vacation policy and up to 18 days of accrued paid sick leave are there to help support our employees. We also offer 401(k) (including company match) and an Employee Stock Purchase Program. For 2024, we offer 10 paid local holidays, 11 paid company wellness days. Why Fastly?We have a huge impact. Fastly is a small company with a big reach. Not only do our customers have a tremendous user base, but we also support a growing number of open source projects and initiatives. Outside of code, employees are encouraged to share causes close to their heart with others so we can help lend a supportive hand.We love distributed teams. Fastly's home-base is in San Francisco, but we have multiple offices and employees sprinkled around the globe. As a new hire, you will be able to attend our IN-PERSON new hire orientation in our San Francisco office! It is an exciting week-long experience that we offer to new employees to build connections with colleagues across Fastly, participate in hands-on learning opportunities, and immerse yourself in our culture firsthand.We value diversity. Growing and maintaining our inclusive and diverse team matters to us. We are committed to being a company where our employees feel comfortable bringing their authentic selves to work and have the ability to be successfulevery day.We are passionate. Fastly is chock full of passionate people and we're not 'one size fits all'. Fastly employs authors, pilots, skiers, parents (of humans and animals), makeup geeks, coffee connoisseurs, and more. We love employees for who they are and what they are passionate about.We're always looking for humble, sharp, and creative folks to join the Fastly team. If you think you might be a fit please apply! A fully completed application and resume or CV are required when applying.Fastly is committed to ensuring equal employment opportunity and to providing employees with a safe and welcoming work environment free of discrimination and harassment. Our employment decisions are based on business needs, job requirements and individual qualifications. All qualified applicants will receive consideration for employment without regard to age, ancestry, color, family or medical care leave, gender identity or expression, genetic information, marital status, medical condition, national origin, family or parental status, physical or mental disability, political affiliation, protected veteran status, race, religion, sex (including pregnancy), sexual orientation, or any other characteristic protected by applicable laws, regulations and ordinances.Consistent with the Americans with Disabilities Act (ADA) and federal or state disability laws, Fastly will provide reasonable accommodations for applicants and employees with disabilities. If reasonable accommodation is needed to participate in the job application or interview process, to perform essential job functions, and/or to receive other benefits and privileges of employment, please contact your Recruiter, or the Fastly Employee Relations team at candidateaccommodations@fastly.com or 501-287-4901. Fastly collects and processes personal data submitted by job applicants in accordance with our Privacy Policy. Please see our privacy notice for job applicants.

Fastly Interview Questions

Fastly Interview Guides

Fastly Interview Questions

Fastly Salaries by Position

Fastly Opening Jobs