Systems Engineer

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.

Location: Lisbon (Hybrid)

We are looking for a Systems Engineer to help build and manage tools that help engineers deploy and operate the services that make Cloudflare work. Our mission is to provide a reliable and flexible platform to help product teams release new software efficiently and safely. The role includes both software engineering and operational responsibilities.

• Design and build scalable and resilient systems that can keep up with company growth.

• Design and build developer productivity tooling.

• Harden the platform against security threats and resource contention issues.

• Improve our development systems and practices.

• Improve the efficiency of managing resources such as CPU, bandwidth and storage.

• Work with application teams to understand their potential challenges and help them choose the best way to architect their systems.

• Drive initiatives that make our engineers happier and more productive.

• Help respond and prevent incidents impacting core platforms.

Desirable Skills, Knowledge, and Experience

• Demonstrable professional experience building and managing large-scale distributed systems or Linux production environments.

• Proficiency in at least one systems programming or scripting language (e.g., Go, Rust, C/C++, Python) with a track record of writing clean, maintainable code.

• Experience managing containerized workloads at scale using Kubernetes, Docker, or similar orchestration platforms.

• Experience with CI/CD pipelines and automated testing strategies for infrastructure.

• Source control experience including branching, merging and rebasing.

• Strong analytical and troubleshooting skills, with a methodical approach to diagnosing complex system-level failures.

Bonus Points

• Experience with configuration management and infrastructure-as-code tools (e.g., Ansible, Terraform, SaltStack).

• Deep understanding of Linux/Unix operating system internals (e.g., storage