Senior Security Engineer – Detection Engineering

Fastly
· United States, Denver, CO / New York City, NY / San Francisco, CA

Not specified Full-time Senior Security

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 Git Hub, Yelp, Paramount, and Jet Blue.

We’re building a more trustworthy Internet. Come join us.

Posting Open Date:October 6, 2026

Anticipated Posting Close Date*:December 6, 2026

* Job posting may close early due to the volume of applicants.

Senior Security Engineer, Detection Engineering

As a Senior Security Engineer on our Detection Engineering team, you will build the detections that catch malicious activity across the Fastly environment and drive the investigations that follow. We are looking for a teammate with a strong security engineering foundation and hands‑on experience in security incident response, detection development, and applying AI to security operations. In this role, you will design and build AI agents and automations to support detection and response, develop advanced detections, perform threat hunts, and lead security investigations.

What You’ll Do:

• Develop detections and other analytics to identify threats across cloud, container, corporate, and edge environments.
• Lead security investigations, analyzing complex log sources and telemetry to determine root cause.
• Build AI agents and automations that speed up detection development, triage, and incident response.
• Research, evaluate, implement, and maintain a variety of custom and commercial security tools, such as EDR, SOAR, and SIEM.
• Conduct threat hunts to discover unknown malicious activity across our environment.
• Participate in our on‑call rotations.

The preferred locations for this position are:

• New York, NY

Fastly currently embraces a largely hybrid model for most roles which allows employees flexibility to split their time between the office and home.

There is a strong preference for Hybrid near a local office. However, we may be willing to consider remote candidates within the US.

This position may require travel as required by your role or requested by your manager.

SF / LA Fair Chance Ordinance Statement

Pursuant to the San Francisco Fair Chance Ordinance and the Los Angeles Fair Chance Initiative for Hiring Ordinance, we will consider for employment qualified applicants with arrest and conviction records.

The estimated salary range for this position is $167,790 to $201,348.

Starting salary may vary based on permissible, non‑discriminatory factors such as experience, skills, qualifications, and location.

This role may be eligible to participate in Fastly’s equity and discretionary bonus programs.

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 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…