Software Engineer, Traffic Management Lisboa

About Us

At Cloudflare, we are on a mission to help build a better Internet. 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. Cloudflare was named to Entrepreneur Magazine’s Top Company Cultures list and ranked among the World’s Most Innovative Companies by Fast Company.

Available Locations

• Austin, TX
• Lisbon, PT
• London, UK

Job Title

Software Engineer – Traffic Management

Role Summary

Multiple teams at Cloudflare make up and contribute to its Traffic Management function. Together they are responsible for the systems that optimize the flow of traffic into, through, and from Cloudflare's global network. They manage traffic for numerous products and millions of customers, from individual websites to major enterprises. This team is at the heart of Cloudflare’s mission to make the internet faster, safer, and more reliable.

Role Responsibilities

• Build and extend various traffic management and supporting systems.
• Collaborate with Network Engineering, Product Engineering, Network Strategy, and other teams on ambitious initiatives to make the best use of Cloudflare’s global network.
• Participate in all stages of the software development lifecycle: designing and documenting systems, writing code and automated tests, planning, managing, and monitoring production software deployments.
• Work with a wide range of technologies and programming languages, including Go, Python, Rust, e
  BPF, Click
  House, Salt, Postgre
  SQL, Prometheus, Kubernetes, and more.
• Operate under a “Run What You Build” model, responsible for the health of systems and actively participate in on‑call rotation.
• Shaping the future of reliability and performance on the Internet, you enjoy being outside your comfort zone, comfortable in a fast‑paced but sensible work environment, and value curiosity and empathy.

Role Requirements

Must‑Have Skills

• Systems‑level programming experience in Go, Python, Rust, C, or C++.
• Solid grasp of networking protocols in Layers 3 and 4 of the OSI Model.
• Experience/interest in network performance monitoring and tuning, including the use of e
  BPF and related technologies.
• Knowledge of HTTP, TLS, and CDN networks.
• Experience in implementing, deploying, and debugging secure and highly‑available distributed systems.
• Strong collaboration and communication skills.

Bonus Points

• Experience building or developing capabilities in the domain of traffic engineering, including automated load balancing and traffic prioritization.
• Knowledge of statistical‑analysis techniques and control theory.
• Knowledge of TCP/IP and Internet routing.
• Experience building tools and APIs.
• Experience with monitoring, alerting, and debugging large‑scale distributed systems.
• Experience participating in an on‑call rotation.

What Makes Cloudflare Special?

Project Galileo, Athenian Project, and 1. 1. 1. 1 are just a few of the ways we protect the free and open Internet. We provide powerful tools to defend journalism and civil society organizations, support state and local governments with reliable services, and offer a privacy‑centric public DNS resolver. 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. 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.

Seniority Level

Associate

Employment Type

Full‑time

Job Function

IT Services and IT Consulting, Technology, Information and Internet, and Computer and Network Security

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