Senior Engineer - Developer Experience

• Be responsible for a developer tool which provides critical capabilities for Fastly’s customers
• Ensure that the tool provides faithful emulation of the production environment while also offering controls to influence the behavior of the emulated environment
• Work closely with Fastly’s product and engineering management teams to develop a roadmap for the emulation tool and ensure that the roadmap stays aligned with the production environment
• Work directly with customers who use the tool to support their usage and learn what additional functionality would be beneficial for them
• Contribute to the Rust and WebAssembly open source ecosystems

• You have at least 5 years of software development experience, with at least 3 of those in high-reliability systems programming, ideally in Rust, alternately in C/C++, and some knowledge of functional programming
• You have a minimum of 2 years of experience with distributed or cloud systems
• Comfortable writing asynchronous, concurrent code

We’ll be super impressed if you have experience in any of these:

• Experience with Rust or other systems languages
• Experience with API design
• Experience with WebAssembly and its ecosystem
• Experience with and interest in technical writing
• Experience with and interest in public speaking
• History of open source contribution

Work Hours:

• This position will require you to be available during core business hours, with a strong preference for US Eastern and Central time zones.

Pulled from the full job description

• Employee stock purchase plan
• Health insurance
• 401(k) matching
• Vision insurance
• Dental insurance
• Paid sick time
• Life insurance, The estimated salary range for this position is $181,220 to $217,464., 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 match) and an Employee Stock Purchase Program. For 2026, we offer 11 paid local holidays, 121 paid company wellness days.

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., This team is responsible for a wide variety of tools that are used by Fastly’s customers to create, manage, and operate their resources on the Fastly platform. One of these tools is a ‘local emulator’ for the Fastly Compute product, which allows developers building Compute services to test the behavior of their service code in a wide variety of scenarios.

We are looking for a Senior Software Engineer to join this team and become the primary maintainer of the tool, collaborating with other members of the team and a number of other teams within Fastly Engineering to ensure that the tool supports all of the functionality and testing capability that Fastly’s customers expect. This role will involve extensive cross-team collaboration, designing high-quality interfaces for developers who use the emulation tool, and significant involvement in a variety of open source projects which are incorporated in the tool (or used in its development and support)., 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.