Software Engineer - Cloudflare One in London

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About Us

At Cloudflare, we are on a mission to help build a better Internet. Our 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.

Available Locations: Austin, TX; London, UK; Lisbon, PT. The role is hybrid with expectation of 2 days per week in the office.

About The Role

We are hiring software engineers of all experience levels across many of our teams. The Cloudflare One platform brings together networking, application security, and access controls into a single cloud‑based network‑as‑a‑service solution. As a Software Engineer on our Network Services and Zero Trust teams, you will contribute to mission‑critical systems powering millions of websites and devices.

Responsibilities

• Design, build, and maintain scalable software systems for global network services and Zero Trust platforms.
• Develop robust, high‑performance networking code using modern programming languages (Rust, Go).
• Collaborate closely with product managers and cross‑functional engineering teams to deliver new solutions for connectivity, security, and performance.
• Participate in the design and integration of RESTful APIs and backend systems, especially for asynchronous and distributed architectures.
• Improve code quality through rigorous documentation, testing, and adherence to industry best practices.
• Troubleshoot, optimize, and scale distributed systems deployed worldwide.
• Work at both systems (operating system, networking primitives) and application (user and API‑facing) layers.
• Contribute to the reliability, security, and scalability of Cloudflare’s infrastructure, including on‑prem/cloud integrations.

Required Qualifications

• 3+ years professional software engineering experience.
• Bachelor’s or Master’s degree in Computer Science or equivalent practical experience.
• Proficiency with Rust, Go, or similar systems‑level programming languages.
• Solid foundation in networking concepts (TCP/IP, UDP, VPNs, firewalls, DNS, QUIC, HTTP, proxying).
• Familiarity with the design and development of distributed, asynchronous backend architectures.
• Willingness, curiosity, and enthusiasm to learn new programming languages, technologies, and systems.
• Clear written and verbal communication skills, especially for cross‑team collaboration.

Preferred Qualifications

• Experience with Linux networking primitives, cloud technologies, and virtualization platforms.
• Prior work on zero trust, cloud security, or enterprise networking products.

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!

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.