Senior Engineer Developer Experience

Fastly helps people stay better connected with the things they love. Fastlys 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. Fastlys customers include many of the worlds most prominent companies including GitHub Yelp Paramount and JetBlue.

Were building a more trustworthy Internet. Come join us.

Senior Software Engineer Developer Experience

Posting Open Date: 06/08/2026

Anticipated Posting Close Date*: 08/17/2026

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

Senior Software Engineer Developer Experience

This team is responsible for a wide variety of tools that are used by Fastlys 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 Fastlys 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).

What Youll Do:

• Be responsible for a developer tool which provides critical capabilities for Fastlys 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 Fastlys 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

What Were Looking For:

• 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

Well 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.

Work Location(s) & Travel Requirements:

This position is open to the following preferred office locations:

• New York City

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

Salary:

The estimated salary range for this position is $181220 to $217464.

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 Fastlys equity and discretionary bonus programs.

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 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.

Why Fastly

• We have a huge impact.Fastly is a small company with a big reach. Not only doour customershave a tremendous user base but we also support a growing number ofopen source projects and 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 were 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.

Were 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 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 @ or @ 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 or .

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