Senior Software Engineer Distributed Systems

Position location: London or Lisbon

Hiring Process & Cloudflares Engineering Teams

Cloudflare is a fast growing company and engineering is an everevolving function with teams being formed and redefined often. To streamline our hiring for Distributed Systems Engineers at Cloudflare weve created a Single Hiring Pipeline (SHP) that enables candidates to be considered for multiple engineering teams through a single standardized interview process. This approach allows us to assess your skills and knowledge and match you with the team that best aligns with your strengths and interests.As part of the hiring process you will have the opportunity to meet with and ultimately select one or more teams; here are a few examples of the teams that you could be part of.

Application Performance; Application Security; Zero Trust Services; Serverless Bot Management; DDoS Protection; Network Services / Magic Products; Full Stack / Microservices; Security / Cryptography; Content Delivery; Email Security; API Security; Client / WARP applications; Machine Learning; Threat Intelligence

About the Role

Cloudflares Engineers build and operate the software that helps power 25 million Internet properties and millions of businesses around the world. Across our engineering organizations we have opportunities for high caliber curious and empathetic people to take on big challenges and build some of the best skills in the industry. Were looking for talented team members to help build highgrowth products help scale our expanding network build tools to improve availability performance uptime and response times and make systems failureresistant and readytoscale.

Cloudflare is a system spanning the globe on a mission to make the Internet better safer and more powerful every day. As a Distributed Systems Engineer at Cloudflare youll work on the code that runs close to the end user runs at a massive scale and is deployed to 250 cities around the world.

Examples of software systems at Cloudflare include:

• A TLS/HTTP proxy to make the connection from eyeball to edge as fast and secure as possible
• Filtering malicious traffic and handling good traffic according to customer configuration
• Content optimization that takes content served from customer sites and makes it more performant
• A platform that runs serverless Workers and provides a key value store
• A reverseproxy system that caches customer website content according to customer configuration
• Optimization of connections from Cloudflare to our customers origin servers to reduce their load and increase performance
• Our Authoritative DNS server and our public resolver 1.1.1.1.
• One of the biggest data pipelines in the world operating at well over 25M events per second

We operate some of the fastest and most widely distributed services on the Internet. Your work will focus on building robust secure and high performance distributed systems. We are a small engineering team operating at a massive scale so what you do will have a huge impact.

Examples of desirable skills knowledge and experience

• Understanding at the protocol level including the differences between what the specs say and what actually happens on the Internet
• Confidence to work in multiple programming languages bonus points for Go and/or Rust experience
• Experience (and love) for debugging to ensure the system works in all cases
• Strong systems level programming skills
• Excited by the idea of optimizing complex solutions to general problems
• Experience with a continuous integration workflow and using source control (we use git)
• Good Unix knowledge patches to Operating Systems a huge plus for some roles
• Understanding of security issues and responsibilities
• Experience with monitoring alerting and debugging high volume production systems
• Fluent in analyses of data sets such as logs
• Designing and building APIs
• Great oral and written communications skills
• Desire to learn and improve
• Willing and eager to share knowledge and mentor

This role may require flexibility to be oncall outside of standard working hours to address technical issues as needed.

What Makes Cloudflare Special

Were not just a highly ambitious largescale technology company. Were a highly ambitious largescale technology company with a soul. Fundamental to our mission to help build a better Internet is protecting the free and open Internet.

Project Galileo: Since 2014 weve equipped more than 2400 journalism and civil society organizations in 111 countries with powerful tools to defend themselves against attacks that would otherwise censor their work technology already used by Cloudflares enterprise customersat no cost.

Athenian Project: In 2017 we created the Athenian Project to ensure that state and local governments have the highest level of protection and reliability for free so that their constituents have access to election information and voter registration. Since the project weve provided services to more than 425 local government election websites in 33 states.

1.1.1.1: We released 1.1.1.1 to help fix the foundation of the Internet by building a faster more secure and privacycentric public DNS resolver. This is available publicly for everyone to use it is the first consumerfocused service Cloudflare has ever released. Heres the deal we dont store client IP addresses never ever. We will continue to abide by our privacy commitment and ensure that no user data is sold to advertisers or used to target consumers.

Sound like something youd like to be a part of Wed love to hear from you!

This position may require access to information protected under U.S. export control laws including the U.S. Export Administration Regulations. Please note that any offer of employment may be conditioned on your authorization to receive software or technology controlled under these U.S. export laws without sponsorship for an export license.

Cloudflare is proud to be an equal opportunity employer. We are committed to providing equal employment opportunity for all people and place great value in both diversity and inclusiveness. All qualified applicants will be considered for employment without regard to their or any other persons perceived or actual race color religion sex gender gender identity gender expression sexual orientation national origin ancestry citizenship age physical or mental disability medical condition family care status or any other basis protected by law. We are an AA/Veterans/Disabled Employer.

Cloudflare provides reasonable accommodations to qualified individuals with disabilities. Please tell us if you require a reasonable accommodation to apply for a job. Examples of reasonable accommodations include but are not limited to changing the application process providing documents in an alternate format using a sign language interpreter or using specialized equipment. If you require a reasonable accommodation to apply for a job please contact us via email at or via mail at 101 Townsend St. San Francisco CA 94107.