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Cloudflare is seeking a Systems Engineer to join its platform engineering team in Lisbon. The role combines software engineering and operational responsibilities, focusing on building and managing tools that enable engineers to deploy and operate Cloudflare's services reliably and efficiently.
You will design and build scalable, resilient systems that support company growth and developer productivity. Key responsibilities include designing developer productivity tooling, hardening the platform against security threats and resource contention, improving development systems and practices, and optimizing resource management (CPU, bandwidth, storage). You'll work closely with application teams to help them architect systems effectively, drive initiatives that improve engineer productivity, and help respond to and prevent incidents affecting core platforms.
This is an individual contributor role focused on systems-level work rather than people management. You'll be working on infrastructure that powers millions of websites and Internet properties for customers ranging from individual bloggers to Fortune 500 companies.
Requirements:
- Demonstrable professional experience building and managing large-scale distributed systems or Linux production environments
- Proficiency in at least one systems programming or scripting language (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 qualifications:
- Experience with configuration management and infrastructure-as-code tools (Ansible, Terraform, SaltStack)
- Deep understanding of Linux/Unix operating system internals (storage subsystems, memory management) and core networking protocols (TCP/IP, DNS)
- Contributions to open-source systems software projects or active participation in the broader systems engineering community
