Senior Software Engineer - London

About Us

At Cloudflare, we are on a mission to help build a better Internet. Today the company runs one of the world’s largest networks that powers millions of websites and other Internet properties for customers ranging from individual bloggers to SMBs to Fortune 500 companies. Cloudflare protects and accelerates any Internet application online without adding hardware, installing software, or changing a line of code. Internet properties powered by Cloudflare all have web traffic routed through its intelligent global network, which gets smarter with every request. As a result, they see significant improvement in performance and a decrease in spam and other attacks. Cloudflare was named to Entrepreneur Magazine’s Top Company Cultures list and ranked among the World’s Most Innovative Companies by Fast Company. 

We realize people do not fit into neat boxes. We are looking for curious and empathetic individuals who are committed to developing themselves and learning new skills, and we are ready to help you do that. We cannot complete our mission without building a diverse and inclusive team. We hire the best people based on an evaluation of their potential and support them throughout their time at Cloudflare. Come join us! 

Available Location: Lisbon & London

Hiring Process & Cloudflare's Engineering Teams

If you want to build things at Cloudflare but are unsure about which team to apply for, this role will give you the best opportunity to match with a team that is most aligned to your experience, skill, and ambition. We've created a hiring process designed to find great candidates and figure out where they fit best as we go along. At the end of the hiring process you will have the opportunity to meet with one or more teams to find out if there is a fit, but if you discover during the interview process that a particular team or product area is interesting to you let us know.

About Engineering at Cloudflare

Cloudflare’s 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. We’re looking for talented team members to help build high-growth products, help scale our expanding network, build tools to improve availability, performance, uptime, and response times, and make systems failure-resistant and ready-to-scale.

Cloudflare is a system spanning the globe, on a mission to make the Internet better, safer, and more powerful every day. As a Software Engineer at Cloudflare, you’ll work on the code that runs close to the end user, runs at a massive scale, and is deployed to 330+ cities around the world.

Examples of software systems at Cloudflare:

Since we don't know what team you'll be working on quite yet, here's some things that we do at Cloudflare. This is not a complete list, but gives a good indica
tion of the wide variety of things you might work on.

• 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 reverse-proxy 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.
• Data Science diving deep into HTTP request data, identifying malicious and fraudulent traffic patterns, and building novel solutions for mitigating such attacks.
• Full Machine Learning platform and model development, from feature engineering to model development to release and monitoring.
• One of the biggest data pipelines in the world, operating at well over 250M 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.

Requirements for any role

If you think some of this list describes you (or what you aspire to be) we would love to talk to you. While not listed as a requirement, we also want to call out that most roles need the flexibility to be on-call outside of standard working hours to a