Job Details

Overview

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 be programmable, and to support agile software development. Fastly's customers include Vimeo, Pinterest, The New York Times, and GitHub.

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

Posting Open Date: Oct 20, 2025

Anticipated Posting Close Date: Nov 21, 2025

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

Senior Application Security Engineer – What You'll Do

• Perform risk-based vulnerability assessments to prioritize critical issues
• Collaborate with engineering teams to coordinate vulnerability remediation
• Automate security workflows by developing custom internal tooling and scripts
• Manage vulnerability-related security incidents
• Build security guardrails directly into our CI/CD pipelines to proactively prevent vulnerabilities
• Drive security initiatives that shape our application security program

What We're Looking For (Required)

• 5+ years Application Security or other domain related experience
• Hands-on experience implementing and running SAST, DAST, and SCA tools
• Ability to implement security policies without compromising developer experience
• Experience communicating complex security changes and requirements to engineering teams
• Proficiency in one or more general-purpose programming languages (Rust, Ruby, Go, or Python)
• Familiarity with security testing tools, such as Burp Suite and nmap
• Strong networking fundamentals and knowledge of cloud-native environments and Kubernetes

Nice to Have

• In-depth knowledge of Linux/Kernel internals, including analyzing AMD and Intel vulnerabilities
• Proficiency in Rust and Terraform
• Experience with offensive security, including penetration testing or red teaming

Work Hours

• This is a full-time position that requires availability during core business hours. You may participate in an on-call rotation to advise on security incidents outside of business hours (approximately one week per quarter).

Work Location(s) & Travel Requirements

This position is open to the following preferred office locations:

• New York, NY
• San Francisco, CA
• Denver, CO

Fastly embraces a largely hybrid model for most roles, allowing flexibility to split time between the office and home. This position may require travel as required by your role or requested by your manager.

Fair Chance Statement

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

Salary

The estimated salary range for this position is $181,220 to $217,464. Starting salary may vary based on permissible factors such as experience, skills, qualifications, and location. This role may be eligible to participate in Fastly's equity and discretionary bonus programs.

Benefits

We offer a comprehensive benefits package including medical, dental, and vision insurance. We also provide family planning, mental health support, Employee Assistance Program, life/disability/accident insurance, Flexible Vacation, up to 18 days of accrued paid sick leave, 401(k) with company match, and an Employee Stock Purchase Program. For 2025, we offer 11 paid local holidays and 11 paid company wellness days.

Why Fastly?

• We have a huge impact. Fastly is a small company with a big reach.
• We love distributed teams and support a global workforce.
• We value diversity and strive to create an inclusive environment.
• We are passionate and collaborative, with a culture that values authentic interests and contributions.

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 during the application process.

EEO and Accommodations

Fastly is committed to ensuring equal employment opportunity and to providing employees with a safe and welcoming work environment free of discrimination and harassment. We will provide reasonable accommodations for applicants and employees with disabilities as needed for the application process and job duties. For accommodations, please contact our Recruiter or the Fastly Employee Relations team.