Software Engineer, Testing at Scale

Cloudflare

full-time

Posted on: 1/21/2026

Location Type: Hybrid

Location: Lisbon • Portugal

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About the role

You’ll have a strong programming background with a deep understanding and experience developing and maintaining distributed systems.
You’ll need to be able to communicate effectively with engineers across the company to understand the behaviours of our systems and products in order to deliver tooling to meet their testing needs.
You will also work closely with product managers to support our public facing synthetic testing and load testing products for enterprise customers.

Proven track record as a software engineer or similar role.
Programming experience with one of the following languages: Go or Rust.
Experience designing, implementing and maintaining secure and highly-available distributed systems.
Ability to develop, document and execute test and SLO plans, test cases and test scripts to verify systems continue to operate as expected.
Create and maintain production testing infrastructure and availability reporting.
Collaborate with cross-functional engineering teams to understand how their systems function and interact with other Cloudflare systems.
Help drive continued improvements in the software development testing processes.
Be a good communicator, provide clear and concise feedback to engineering and product teams.
Experience with measuring uptime metrics like correctness, availability & latency SLOs/SLIs.

Benefits

Applicant Tracking System Keywords

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

Hard Skills & Tools

GoRustdistributed systemssecure systemshighly-available systemstest planstest casestest scriptsproduction testing infrastructureuptime metrics

Soft Skills

communicationcollaborationfeedbackcross-functional teamworkproblem-solvingdocumentationprocess improvement