Software Engineer, Rulesets

• Join Cloudflare’s Front Line group, which maintains and develops the main Cloudflare web server processing over 100 million HTTP requests per second. • Work on what is effectively the largest web server in the world. • Sit within the Product team, creating new customer-facing features, improving efficiency and safety, and building the next iteration of Cloudflare products. • Build on a platform written mostly in Rust, with most of the API in Go. • Focus particularly on the rules engine and its associated control plane. • Create new features that increase the availability, safety, and reliability of the edge ecosystem. • Sit at the nexus of Cloudflare edge applications and operations, collaborating with most other product and engineering teams. • Work from London on a hybrid basis.

• Bring solid competencies in practical computer science, applying the right algorithms, data structures, and concurrency control systems to software design. • Build large, distributed systems. • Bring experience in performance engineering. • Drive communication and consensus across teams. • Bring a drive for continuous improvement across both operations and new product development. • Want to learn something new, since the team maintains the largest web server in the world and faces unique challenges.

• Bring experience with Rust and Go, though Cloudflare is happy for you to learn on the job. • Bring knowledge of web servers and web protocols. • Bring experience with distributed systems. • Know web security issues and industry standards. • Enjoy designing innovative solutions that improve life for millions of people worldwide. • Spot problems everyone else has normalised and build a solution with the latest tools.

• Work with a team of engineers to create new features that increase the availability, safety, and reliability of the edge ecosystem. • Improve existing features across the rules engine and control plane. • Create new systems from scratch. • Collaborate with platform teams to help build the best web server in the world. • Work closely with product and engineering teams across Cloudflare on edge applications and operations.

We have used Cloudflare products ourselves, including Turnstile to protect apps from bots, so we know first-hand how solid their tech is, and that matters when you are thinking about where to work. With over $2.1 billion in annual revenue, 34% growth in Q4 2025, and $4 billion+ in cash reserves, Cloudflare is financially rock-solid and still growing fast. They operate one of the largest networks in the world, sit in front of roughly one in five websites, and are pushing hard into AI infrastructure and the agentic web. The scale of what they do is genuinely impressive; so many of the apps and services you use every day depend on Cloudflare without you even knowing it. Across Glassdoor, employees consistently highlight the great products, friendly and smart colleagues, positive working environment, and genuine flexible hybrid and work-from-home arrangements. They also offer unlimited paid time off and have a real focus on diversity and inclusion. We should be upfront, though: the Glassdoor rating sits at 3.4, and reviews are mixed. While the culture and people are widely praised, compensation competitiveness and slow promotion processes are recurring pain points. However, if you want to solve hard, Internet-scale problems at a company whose products you probably already rely on, Cloudflare is a brilliant place to do that.

• Work on the software platform serving 115 million HTTP requests per second on average. • Experience the full breadth of technologies needed to run one of the world’s largest networks, serving customers such as Shopify and VISA. • Build and run tools that deploy software across 350+ data centres globally. • Learn Rust and Go on the job if you do not already know them. • Work hybrid from the London office. • Join a company named to Entrepreneur Magazine’s Top Company Cultures list and ranked among Fast Company’s World’s Most Innovative Companies. • Contribute to public interest work including Project Galileo, the Athenian Project, and the 1.1.1.1 resolver.

Cloudflare is on a mission to help build a better Internet, running one of the world’s largest networks and powering millions of websites and Internet properties for customers from individual bloggers to Fortune 500 companies. Its engineering team is responsible for the software platform serving 115 million HTTP requests per second on average, plus the tooling that deploys and monitors software across more than 350 data centres. The Front Line group within it owns the main Cloudflare web server, handling over 100 million HTTP requests per second. Fundamental to Cloudflare’s mission is protecting the free and open Internet through Project Galileo, the Athenian Project, and the 1.1.1.1 resolver.