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Systems Reliability Engineer

Cloudflare, London, United Kingdom

Help us build a better Internet


About Us

At Cloudflare, we have our eyes set on an ambitious goal: to help build a better Internet. Today, Cloudflare runs one of the world’s largest distributed networks that powers more than 10 trillion requests per month, which is nearly 10 percent of all Internet requests worldwide. Cloudflare protects and accelerates any Internet application online without adding hardware, installing software, or changing a line of code.

Our customers range from Fortune 500 companies and nonprofits to small businesses and budding entrepreneurs. We are working to create a faster, more secure, and more reliable experience for anyone online and given the scale at which we operate, our mission is big. Our team is hard at work shaping the future of the Internet by solving some of its toughest challenges. Come join us!

About the Role

An engineering role at Cloudflare provides an opportunity address some big challenges, at scale.  We believe that with our talented team, we can solve some of the biggest security, reliability and performance problems facing the Internet. Just how big?  

  • We have in excess of 15 Terabits of network transit capacity
  • We process 10% of the world’s Internet traffic
  • We operate 153 Points-of-presence around the world
  • We serve more traffic than Twitter, Amazon, Apple, Instagram, Bing, & Wikipedia combined
  • Anytime we push code, it immediately affects over 200 million internet users
  • Every day, up to 20,000 new customers sign-up for Cloudflare service
  • Every week, the average Internet user touches us more than 500 times

We are looking for talented Systems Reliability Engineers to build and operate the platform which makes Cloudflare customers place their trust in us.  Our SREs come from a variety of technical backgrounds and have built up their knowledge working in different environments. But the common factors across all of our reliability-focused engineers include a passion for automation, scalability, and operational excellence.  Our SRE teams monitor our network in a “follow the sun” approach with offices in Singapore, London, and San Francisco.

We are still a small team, well-funded, growing quickly and focused on building an extraordinary company.  This is a superb opportunity to join a high-performing team and scale our high-growth network as Cloudflare’s business grows.  You will build tools to constantly improve availability, performance, uptime and response times. You will nurture a passion for an “automate everything” approach that makes systems failure-resistant and ready-to-scale.   

Cloudflare SREs work in one of these 4 teams:

  • Core Operations
  • Edge Operations
  • Core Platform
  • Edge Platform

The Operations teams focus on the immediate state and functionality of the Cloudflare platform around the world, leveraging an array of monitoring, alerting and diagnostics tools.  The Platform teams focus on developing and enhancing the Cloudflare platform and its capabilities. The Platform and Operations team are both “devops” teams, responsible for reliability engineering across a wide portfolio of applications and services, leveraging developer and operator patterns.  Many of our SREs have had the opportunity to work at multiple offices on interim and long-term project assignments. The ideal SRE candidate has a passionate curiosity about how the Internet fundamentally works and has a strong knowledge of DNS, Linux and TLS along with strong coding ability in Bash, Python or Go. We prefer to hire very experienced candidates; however raw skill trumps experience and we welcome strong junior applicants.

Requisite Skills

  • Linux systems administration experience
  • 3 years of relevant Site Reliability Engineering experience
  • Intermediate level software development skills in Python, Go or SQL
  • Strong skills in network services, including DNS, TLS/SSL and HTTP
  • Network fundamentals DHCP, ARP, subnetting, routing, firewalls, IPv6

Examples of desirable skills, knowledge and experience

  • 5 years of relevant work experience
  • Experience with the Linux kernel and Linux software packaging
  • Performance analysis and debugging with tools like perf, sar, strace, dtrace
  • Configuration management systems such as Saltstack, Chef, Puppet or Ansible
  • Load balancing and reverse proxies such as Nginx, Varnish, HAProxy, Apache
  • SQL databases (Postgres or MySQL)
  • Time series databases (OpenTSDB, Graphite, Prometheus, Grafana)
  • Key/Value stores (Redis, KyotoTycoon, Cassandra, LevelDB)
  • Internetworking and BGP

Bonus Points

  • Experience with network programming in C, C++ or Go
  • Experience with continuous / rapid release engineering
  • Strong tooling and automations development experience
  • Experience working in a 24/7/365 service environment
  • High-bandwidth transit Internetworking and routing experience

Some tools that we use

  • Nginx
  • Salt
  • Python
  • PostgreSQL
  • Redis
  • Docker
  • Prometheus
  • Mesos / Marathon

What Makes Cloudflare Special?

We’re not just a highly ambitious, large-scale technology company. We’re a highly ambitious, large-scale technology company with a soul. Fundamental to our mission to help build a better Internet is protecting the free and open Internet.

Project Galileo: We equip politically and artistically important organizations and journalists with powerful tools to defend themselves against attacks that would otherwise censor their work, technology already used by Cloudflare’s enterprise customers--at no cost.

Project Athenian: We created 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.

Path Forward Partnership: Since 2016, we have partnered with Path Forward, a nonprofit organization, to create 16-week positions for mid-career professionals who want to get back to the workplace after taking time off to care for a child, parent, or loved one.

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 privacy-centric public DNS resolver. This is available publicly for everyone to use - it is the first consumer-focused service Cloudflare has ever released. Here’s the deal - we don’t store client IP addresses never, ever. We will continue to abide by our privacy policy and ensure that no user data is sold to advertisers or used to target consumers.

Sound like something you’d like to be a part of? We’d love to hear from you!

Cloudflare hires the best people based on an evaluation of their abilities and effectiveness. We don't discriminate against employees on the basis of any other personal characteristic or any classification protected by federal, state or local law.

About Cloudflare

About us Cloudflare is the simplest way to make websites faster, safer and smarter. Millions of websites have signed up for our service, including large enterprises, major consumer destinations, and government agencies. With offices in San Francisco and London, Cloudflare operates a highly-available global network that has security measures built into every layer and regularly clocks in lightning-fast speeds. We're on a mission to build a better web - and we need smart, talented people to join our team. Our team works on the forefront of leading technologies including nginx, Go and Lua programming languages. We're a strong supporter of the open source community and regularly share our technology learnings at https://blog.cloudflare.com.

Want to learn more about Cloudflare? Visit Cloudflare's website.