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CloudflareSystems Reliability Engineer - Core
Cloudflare is seeking a Systems Reliability Engineer to join its Core team, operating globally distributed infrastructure and server fleets. Cloudflare operates a massive intelligent network that…
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About This Role
Cloudflare is seeking a Systems Reliability Engineer to join its Core team, operating globally distributed infrastructure and server fleets. Cloudflare operates a massive intelligent network that protects, accelerates, and improves performance for millions of internet properties worldwide, ranging from individual bloggers to Fortune 500 corporations. The company's mission is to help build a better, safer, and faster internet while protecting web applications from online attacks. In this role, you will…
Job Description
Cloudflare is seeking a Systems Reliability Engineer to join its Core team, operating globally distributed infrastructure and server fleets. Cloudflare operates a massive intelligent network that protects, accelerates, and improves performance for millions of internet properties worldwide, ranging from individual bloggers to Fortune 500 corporations. The company's mission is to help build a better, safer, and faster internet while protecting web applications from online attacks.
In this role, you will architect, scale, and manage the private cloud and distributed platforms that allow internal product teams to release software reliably and efficiently. You will work with technologies such as Kubernetes, Kafka, Postgres, Vault, and various developer tooling systems. This position is suited for builders with strong problem-solving instincts and experience in managing large-scale infrastructure who want to eliminate systemic issues and utilize modern tools to improve performance.
Cloudflare values curiosity and iteration, utilizing automation to ship faster and maintain high resilience across its global footprint. Applicants should note that the hiring locations for this position include Lisbon, Portugal and London, UK. Additionally, candidates who reach the offer stage may be asked to attend an in-person interview at a company hub, and the position may require handling information subject to U.S. export control laws.
Responsibilities
- Design, deploy, and maintain robust distributed systems focusing on high availability, low latency, and horizontal scalability
- Analyze system bottlenecks, optimize kernel and network stacks, and fine-tune resource utilization across global server fleets
- Build and maintain internal tools and automation frameworks to streamline infrastructure deployment, configuration management, and monitoring
- Participate in architecture reviews, capacity planning, and proactive system health monitoring to guarantee maximum uptime
- Partner cross-functionally with Security, Network Engineering, and Product teams to integrate infrastructure solutions across the stack
Requirements
- Demonstrable professional background in building and managing large-scale distributed systems or Linux production environments
- Proficiency in at least one systems programming or scripting language such as Go, Rust, C/C++, or Python
- Deep understanding of Linux/Unix operating system internals and core networking protocols including TCP/IP, DNS, and BGP
- Experience utilizing configuration management and infrastructure-as-code tools such as Ansible, Terraform, or SaltStack
- Strong analytical and troubleshooting skills with a methodical approach to diagnosing complex system-level failures
Qualifications
- Experience managing containerized workloads at scale using Kubernetes, Docker, or similar orchestration platforms
- Familiarity with CI/CD pipelines and automated testing strategies for infrastructure
- Contributions to open-source systems software projects or participation in the broader systems engineering community
- Prior experience working with tooling such as Kafka and Temporal
- Experience harnessing artificial intelligence to drive robust technical solutions
Core Skills
Frequently Asked Questions
Answers are based only on the employer’s listing; where it doesn’t say, neither do we.
What are the hiring locations for this role?
The posting specifies hiring locations in Lisbon, Portugal, and London, UK.
What employment type is this position?
The source posting specifies full-time employment.
Is salary information provided for this role?
No, the source posting does not specify salary details.
Are there any in-person interview requirements?
Applicants who progress to the offer stage of the interview process may be asked to attend an in-person interview at a Cloudflare Office or Hub.
Sample Interview Questions
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