About this role.
Fastly is hiring a Senior Site Reliability Engineer focused on operating and evolving its global edge-cloud network. The role centers on network reliability, incident leadership, automation, observability, and performance analysis across an anycast-heavy environment. Core technical requirements include TCP/IP, BGP, Anycast, DNS, Linux, Python, cloud platforms, and monitoring tooling. The successful candidate will collaborate with engineering partners, improve operational tooling, document complex systems, and mentor teammates on global routing. The position is available in London on a hybrid basis or remotely within the UK, with occasional on-call, night, and weekend support.
Role DNA
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Sample interview questions
I would first establish scope using user-impact, latency, reachability, and traffic telemetry by region and ASN. I would inspect BGP announcements, path changes, route preference, peer health, and capacity at affected POPs, then compare against a known-good region. After mitigating through routing adjustments, capacity actions, or controlled withdrawal where appropriate, I would document the timeline, root cause, and preventive monitoring or automation improvements.
I would define the desired state and validation rules, store the change in version control, and use code review plus automated linting and tests. The automation should validate inventory and pre-change device state, apply changes in a controlled rollout, verify routing and service health afterward, and support a tested rollback path. I would also ensure logs, approvals, and change results are retained for auditability and incident analysis.
I would examine advertised prefixes, AS paths, local preference, MEDs where relevant, communities, RPKI status, route flap history, peer sessions, and upstream announcements. I would correlate these with NetFlow or sampled flow data, edge utilization, packet loss, and latency to distinguish control-plane changes from capacity or data-plane problems. I would also check whether route filtering, prefix limits, or a maintenance event altered reachability.
I would combine infrastructure telemetry with active and passive measurements. This includes availability probes, DNS resolution time, TCP connection success, TLS timing, HTTP latency, packet loss, retransmissions, route changes, and flow-level traffic patterns segmented by geography, network, POP, and customer service. Alerts should be tied to meaningful error budgets and baselines so responders can prioritize real user impact over isolated device noise.
During an incident, I prioritize restoring user impact safely, communicate status clearly, and preserve evidence for later analysis. Afterward, I translate recurring incidents and manual operational tasks into prioritized reliability work such as better telemetry, runbooks, capacity planning, safeguards, and automation. I use impact, frequency, risk reduction, and engineering effort to make the roadmap visible and to align priorities with partner teams.
Fastly helps people stay better connected with the things they love. Fastly’s edge cloud platform enables customers to create great digital experiences quickly, securely, and reliably by processing, serving, and securing our customers’ applications as close to their end-users as possible — at the edge of the Internet. The platform is designed to take advantage of the modern internet, to be programmable, and to support agile software development. Fastly’s customers include many of the world’s most prominent companies, including GitHub, Yelp, Paramount, and JetBlue.
We’re building a more trustworthy Internet. Come join us.
Senior SRE – Networks
Fastly’s Technical Operations (TechOps) team is responsible for building & operating the infrastructure that powers the Fastly Edge Cloud Platform. We oversee an extensive global network that spans 6 continents with over 100 points of presence and 578 Tbps of connected capacity. Our platform serves a significant portion of the content delivered to internet consumers across the planet, with customers ranging from online media streaming services to e-commerce, to open source projects, nonprofits and more. We take this responsibility seriously!
We’re looking for an experienced SRE with strong focus on Networks, SRE principals and knowledge of the internet who can bring engineering best practices, operational rigour, and automation skills to help craft the future of Fastly’s network and directly contribute to making the internet better.
What You’ll Do:
Build, operate, and maintain the continually growing global network footprint of Fastly’s Edge Cloud Platform.
Response to significant traffic incidents and lead network incidents, resolving edge cases and failure scenarios with your expertise in IP routing, particularly BGP.
Write code that is performant, maintainable, clear, and concise and contribute to code reviews, improving the codebase and other team processes
Partner in the development and iteration of tools and automation systems that improve how we operate and build the network.
Innovate new methods for monitoring network performance, focusing on the end-user experience, and proactively address potential issues.
Continual deep-dive of performance-based analytics and close involvement with partner teams to maintain a performant global network.
Advocate for the operational stability of the network by identifying opportunities and partnering with engineering teams to shape their roadmaps and software solutions.
Mentor team members on the complexities of global routing, especially in an anycast-heavy environment.
What We’re Looking For:
Experience in the protocols and practices that make up the fabric of the global internet, including TCP/IP, BGP, Anycast and DNS.
Experience in Automation and coding using languages like Python, or similar.
Proficiency in Tier 1 Internet service providers, Internet exchanges and cloud providers.
Ability to analyze internet traffic patterns across multiple dimensions using flow-based tools.
Experience working with alerting, monitoring and visibility tools (such as Graphite/Grafana, Prometheus, or Splunk).
Knowledge across cloud hosting solutions (i.e., GCP, AWS and Azure).
Knowledge of DevOps practices and CI / CD pipelines (ie. Git, Jenkins, Ansible).
Understanding of Linux/Unix systems administration and network stack optimisation.
Adept at knowledge sharing and creating comprehensive documentation to empower teams.
Able to collaborate with cross-functional teams to shape the technical roadmap, prioritizing initiatives to optimize automation tooling and the network.
We’ll be super impressed if you have experience in any of these:
Experience writing production-level code using VCL or GO
Experience in network telemetry including instrumenting infrastructure and collecting, processing, storing and analyzing data
Experience working with geographically dispersed teams: previous remote work preferred
Work Hours:
This position will require you to work during scheduled hours from 0800 – 1700.
This position will require you to be available during core business hours.
It may also require occasional nights and weekends as necessary to support any on-call coverage.
Work Location(s) & Travel Requirements:
Fastly currently embraces a largely hybrid model for most roles which allows employees flexibility to split their time between the office and home. This position may require travel as required by your role or requested by your manager.
This position has one opening and can be hired in the following locations:
London (Hybrid)
- UK, Remote
Benefits:
We care about you. Fastly works hard to create a positive environment for our employees, and we think your life outside of work is important too. We support our teams with great benefits that start on the first day of your employment with Fastly. Curious about our offerings?
We offer a comprehensive benefits package designed to meet your needs. Our offerings may vary depending on the country where you work and are subject to change.
Why Fastly?
We have a huge impact. Fastly is a small company with a big reach. Not only do our customers have a tremendous user base, but we also support a growing number of open source projects and initiatives. Outside of code, employees are encouraged to share causes close to their heart with others so we can help lend a supportive hand.
We value diversity. Growing and maintaining our inclusive and diverse team matters to us. We are committed to being a company where our employees feel comfortable bringing their authentic selves to work and have the ability to be successful — every day.
We are passionate. Fastly is chock full of passionate people and we’re not ‘one size fits all’. Fastly employs authors, pilots, skiers, parents (of humans and animals), makeup geeks, coffee connoisseurs, and more. We love employees for who they are and what they are passionate about.
We’re always looking for humble, sharp, and creative folks to join the Fastly team. If you think you might be a fit please apply! A fully completed application and resume or CV are required when applying.
All job applications must be submitted through our official careers site at www.fastly.com/about/careers. We will never request sensitive information, such as your Social Security number, bank account or credit card information during the application process. All official communication will come from an @fastly.com or @recruiting.fastly.com email address.
Fastly is committed to ensuring equal employment opportunity and to providing employees with a safe and welcoming work environment free of discrimination and harassment. Our employment decisions are based on business needs, job requirements and individual qualifications. All qualified applicants will receive consideration for employment without regard to age, ancestry, color, family or medical care leave, gender identity or expression, genetic information, marital status, medical condition, national origin, family or parental status, physical or mental disability, political affiliation, protected veteran status, race, religion, sex (including pregnancy), sexual orientation, or any other characteristic protected by applicable laws, regulations and ordinances.
Consistent with the Americans with Disabilities Act (ADA) and federal or state disability laws, Fastly will provide reasonable accommodations for applicants and employees with disabilities. If reasonable accommodation is needed to participate in the job application or interview process, to perform essential job functions, and/or to receive other benefits and privileges of employment, please contact your Recruiter, or the Fastly Employee Relations team at candidateaccommodations@fastly.com or 501-287-4901.
Fastly collects and processes personal data submitted by job applicants in accordance with our Privacy Policy. Please see our privacy notice for job applicants.
Annual salary information is not provided for this position. Explore salary ranges for similar roles in our Salary Directory ›
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