Senior Engineer - Security Products (Backend APIs)

What You'll Do

• Design, ship, and own public-facing APIs and backend services in Go—from technical proposal & design docs through implementation, testing, and production rollout and on-call support.
• Use AI coding agents as part of your daily workflow.
• Partner with frontend engineers, product managers, and security researchers to ship the customer experience end-to-end.
• Take ambiguous or broadly-scoped problems and turn them into well-defined technical plans that the team can execute on.
• Author design and architectural documents and use them to drive alignment across engineering and product teams.
• Collaborate with internal platform teams, product managers, and stakeholders across the organization to understand needs and deliver impactful solutions.
• Consider stability, performance, and scalability in your designs and in the guidance you provide to the team.
• Mentor and grow other engineers on the team through code review, pairing, and technical leadership.
• Participate in an on-call rotation.

What We're Looking For

• Hands-on experience designing and building reliable, large-scale backend systems—most Senior Engineers at Fastly have at least 5 years of relevant experience.
• 5+ years shipping production Go as your primary language.
• 3+ years on public APIs with external consumers.
• You've shipped a breaking change to customers who'd already integrated against your API.
• You've written a deprecation notice that actually went out.
• You drive projects, not just tasks.
• You've owned a multi-week effort end-to-end: design doc through post-launch.
• Good judgement on RESTful API design: resource modeling, versioning, idempotency, error semantics, pagination, OpenAPI.
• You've made one of these calls wrong in production and remember what it cost to clean up.
• You design for the people downstream of your API.
• The customer hitting your endpoint at 3am, the support engineer debugging their escalation, the frontend teammate integrating against your contract.

Work Hours

This position will require you to be available during core business hours (Pacific Time) and occasional nights and weekends as required for on call support.

Work Location(s) & Travel Requirements

This position is open to the following preferred office locations: San Francisco, CA, USA

Salary

The estimated salary range for this position is 181,220 - 217,464 Starting salary may vary based on permissible, non-discriminatory factors such as experience, skills, qualifications, and location.

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.
• We offer a comprehensive benefits package including medical, dental, and vision insurance.
• Family planning, mental health support along with Employee Assistance Program, Insurance (Life, Disability, and Accident), a Flexible Vacation policy and up to 18 days of accrued paid sick leave are there to help support our employees.
• We also offer 401(k) (including company match) and an Employee Stock Purchase Program.
• For 2026, we offer 11 paid local holidays, 12 paid company wellness days.