Senior Software Engineer - Cloudflare One

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 One here.
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.