Senior Engineer - Developer Experience

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.

We're 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 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).

What You'll Do:

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

What We're 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

We’ll be super impressed if you have expe