Senior Software Engineer - Cloudflare One

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!

Hiring will be focused on those residing within the greater Austin, TX, Lisbon, Portugal, and London, England metro areas. It will be a hybrid role, with the expectation of 2 days per week in the office.

Hiring Process & Cloudflare's Cloudflare One Teams

Cloudflare is building the future of the Internet through global infrastructure and cutting-edge security solutions. As a Senior Software Engineer on our Network Services and Zero Trust teams, you will contribute to mission-critical systems powering millions of websites and devices.

If you want to build things at Cloudflare but are unsure about which team to apply for within Cloudflare One, 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 the Organization

Cloudflare One is a cloud-based network-as-a-service solution that brings together networking, application security, and access controls into a single platform for modern enterprises. It enables organizations to securely connect users, devices, offices, and applications regardless of location, replacing legacy solutions like VPNs and firewalls with a seamless, cloud-delivered model. Cloudflare One delivers fast, reliable, and consistent security controls, protecting remote workforces and distributed infrastructure while simplifying management with a unified control plane. You can read more about Cloudflare Onehere.

About the Role

We are hiring Senior engineers across many of our teams. Some of the things our teams work on include:

• A Linux kernel-based networking dataplane which ingests and forwards traffic from some of the largest networks in the world
• A userspace networking service which acts as a hub between our Network Services and Zero Trust systems, enabling every customer to access every product
• Control plane systems which allow customers to simply express complex network configurations
• Products that empower customers to gain deep visibility into Cloud/SaaS security opportunities and into trends in their network traffic and product use
• A backend system that allows our customers to manage their devices via our Zero Trust Network solution
• A MITM forward-proxy responsible for introspecting and filtering device traffic
• Threat intelligence from a swath of external sources with intelligence mined from Cloudflare's world class data to provide threat intelligence used across a number of Cloudflare products

As a software engineer on our team, you will work across a wide range of technologies and systems to deliver new features, improve performance, and increase the scalability of our CF1 products. You’ll build, deploy, and operate your team’s systems on top of one of the largest edge networks in the world. You’ll partner with some of the best engineers and product managers to solve big problems that have a meaningful impact in the lives of our customers and users.

We’re looking for curious, empathetic engineers who are excited to join us in changing the way networking is done!

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

• 5+ years professional software engineering experience.
• Bachelor’s or Master’s degree in Computer Science or equivalent practical experience.
• Experience leading projects.
• 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 design and development of distributed, asynchronous backend architectures.
• Willingness, curiosity, and enthusiasm to learn new programming languages, technologies, and system
• 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 released1.1.1.1to 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 th...