Senior SRE - Networks

About the role

Fastly's Technical Operations team builds and operates the infrastructure behind its Edge Cloud Platform, which spans 6 continents with over 100 points of presence and 578 Tbps of capacity. It is looking for an experienced SRE with a strong focus on networks, SRE principles and knowledge of the internet, able to bring engineering best practices, operational rigour and automation skills to the network.

Key responsibilities

• Build, operate and maintain the growing global network footprint of the Edge Cloud Platform.
• Respond to major traffic incidents and lead network incidents, resolving edge cases and failures using expertise in IP routing, especially BGP.
• Write performant, maintainable code, contribute to code reviews and improve team processes.
• Help develop and iterate tools and automation systems that improve how the network is operated and built.
• Innovate new ways to monitor network performance, focusing on the end-user experience, and proactively address potential issues.
• Analyse performance-based analytics closely and work with partner teams to keep the global network performant.
• Advocate for network stability by identifying opportunities and partnering with engineering teams on roadmaps and software solutions.
• Mentor team members on global routing, especially in an anycast-heavy environment.

Required profile

• Experience with the protocols and practices of the global internet, including TCP/IP, BGP, Anycast and DNS.
• Experience automating and coding in Python or a similar language.
• Ability to analyse internet traffic patterns across multiple dimensions using flow-based tools.
• Experience with alerting, monitoring and visibility tools such as Graphite/Grafana, Prometheus or Splunk.
• Knowledge of cloud hosting solutions (GCP, AWS, Azure) and of DevOps practices and CI/CD pipelines (Git, Jenkins, Ansible).
• Understanding of Linux/Unix system administration and network stack optimisation.
• Able to share knowledge, document comprehensively and collaborate with cross-functional teams on the technical roadmap.

Nice to have: production-level code in VCL or Go, network telemetry experience, and experience with geographically dispersed teams (remote work preferred). The role is scheduled 08:00-17:00, with availability during core hours and occasional nights and weekends for on-call coverage. It is offered in London (hybrid) or remote in the UK, and may involve travel.