Senior Systems Engineer – Traffic Management

Cloudflare

full-time

Posted on: 12/23/2025

Location Type: Hybrid

Location: Lisbon • 🇵🇹 Portugal

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Senior

Distributed SystemsGoKubernetesPostgresPrometheusPythonRustSaltStackTCP/IP

About the role

Build and extend various traffic management and supporting systems.
Work closely with Network Engineering, Product Engineering, Network Strategy, and other teams.
Participate in all stages of the software development lifecycle: from designing and documenting systems, to writing code and automated tests, to planning, managing, and monitoring production software deployments.
Work with a wide range of technologies and programming languages, including Go, Python, Rust, eBPF, ClickHouse, Salt, PostgreSQL, Prometheus, Kubernetes, and more.
Operate under a 'Run What You Build' model and participate in on-call rotation as part of operational duties.

Minimum of 6 years of engineering experience with networking and/or distributed systems.
Systems-level programming experience in Go, Python, Rust, C, or C++.
Strong knowledge of networking protocols in Layers 3 and 4 of the OSI Model.
Knowledge of HTTP, TLS, and CDN networks.
Experience in implementing secure and highly-available distributed systems.
Strong ability to debug issues in complex systems.
Strong collaboration and communication skills across teams and functions.
Experience participating in an on-call rotation.
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.

Benefits

Tip: use these terms in your resume and cover letter to boost ATS matches.

GoPythonRustCC++eBPFClickHouseSaltPostgreSQLPrometheus

collaborationcommunicationdebuggingproblem-solving