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Software Engineer, Rulesets

Cloudflare

Hybrid — London, United KingdomListed todayPosted by the employer Aug 27, 2026Listing ends Dec 28, 2026

Compensation: Unconfirmed
Location: London, United Kingdom
HybridMore hybrid jobs: United Kingdom
Employment: Full-time
Category: Engineering

Role skills

performance engineering distributed systems rust concurrency go web security security

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About the job

5 min read6 sections

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.

At Cloudflare, we’re not looking for people who wait for a polished roadmap; we’re looking for the builders who see the cracks in the Internet that everyone else has simply learned to live with. We value candidates who have the instinct to spot a "normalized" problem and the AI-native curiosity to create a solution using the latest tools. Our culture is built on iteration, leveraging AI to ship faster today to make it better tomorrow, while ensuring that every improvement, no matter how small, is shared across the team to lift everyone up. If you’re the type of person who values curiosity over bureaucracy, and that AI is a partner in solving tough problems to keep the Internet moving forward, you’ll fit right in.

Available Locations: London (Hybrid)

- About Engineering at Cloudflare

Cloudflare’s Engineering team is responsible for the software platform that serves 115 million HTTP requests per second on average. We also build and run the tools that empower our colleagues to rapidly deliver products to market, as well as monitor and deploy software updates across the globe to 350+ data centers. You’ll experience the full breadth of technologies needed to run one of the world’s largest networks serving the world's largest customers such as Shopify and VISA.

About The Team

Cloudflare’s Front Line (FL) group is responsible for maintaining and developing the main Cloudflare web server, processing over 100 million HTTP requests per second. In other words, we own the largest web server in the world.

The Product Team is responsible for creating new customer-facing features, improving efficiency & safety, and building the next iteration of Cloudflare products. The platform is mostly in Rust, and most of our API is in Golang.

What you'll do

You will work with a team of talented engineers to create new features to increase the availability, safety & reliability of the edge ecosystem. You will improve current features, create new systems from scratch, and collaborate with platform teams to help to build the best web server in the world, with a particular focus on the rules engine and associated control plane.

This is a unique opportunity to be at the nexus of Cloudflare edge applications and operations and to collaborate closely with most other product and engineering teams at Cloudflare.

Examples of desirable skills, knowledge and experience

Solid competencies in practical computer science, applying the right algorithms, data structures, concurrency control systems to software design, and building large, distributed systems
Experience in performance engineering
Driving communication and consensus across teams
A drive for continuous improvement when it comes to both operations and new product development

Bonus Points

These are things which the role is likely to require; we’re happy to help you learn on the job, but prior experience is beneficial

Experience of languages: Rust, Go
Knowledge of web servers and web protocols
Distributed systems
Web security issues and industry standards

Most importantly, we are looking for people who want to learn something new. We maintain the largest web server in the world, and we face unique challenges. You will be collaborating and designing innovative solutions to improve the life of millions of people around the globe, everywhere they are, whatever their needs are.

Join and help us build a better Internet!

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 : Since 2014, we've equipped more than 2,400 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 Cloudflare’s enterprise customers--at 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, we've 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 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 commitment 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!

Please note that applicants who progress to the offer stage of the interview process may be asked to attend an in-person interview within one of the Cloudflare Offices or Cloudflare Hubs. More details about this will be available at that stage of the interview process.

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 person's, 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 e-mail at hr@cloudflare.com or via mail at 101 Townsend St. San Francisco, CA 94107.

About Cloudflare

Cloudflare, Inc., is an American technology company headquartered in San Francisco, California, that provides a range of internet services, including content de…Based on Wikipedia · CC BY-SA 4.0