Jobs for Developers

Principal Software Engineer, Edge Delivery

FastlyFull-time$110k - $270k*New York City, New YorkMay 21, 2024
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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 Vimeo, Pinterest, The New York Times, and GitHub.

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

Principal Software Engineer, Edge Delivery

The Edge Delivery team maintains Varnish, Fastly’s core caching platform. Leveraging C and Rust standards and toolchains, the team develops a high-scale daemon and supporting services that execute customer configurations and connects to a large and growing variety of Fastly back-end services. 

We are looking for a Principal Software Engineer to join this crucial team and help scale our hosting infrastructure. In addition to nuts-and-bolts networking and systems-level work, this role will involve extensive cross-team collaboration as well as the design of high quality APIs to enable our customers to utilize services developed by other teams at Fastly.

What You'll Do:

  • Lead and facilitate collaboration with other teams at Fastly on interfaces to Varnish and related technologies like VCL
  • Design and implement both low- and high-level APIs for interacting with edge services
  • Write C and Rust code that handles host concerns like back pressure, resource limits, and interactions with other services
  • Analyze and address performance and stability issues to meet high scale requirements
  • Participate in and help coordinate incident response and mitigation

What We're Looking For: 

  • You have at least 7 years of production experience as a software engineer with at least 2 of those working on networking/distributed/cloud systems
  • You have been a principal contributor or a tech lead with the ability to influence the direction of a customer facing product
  • You have at least 3 years of experience with either C or Rust 
  • Formal CS education is not required; demonstrable experience is sufficient

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

  • Experience with API design in functional languages
  • Understanding of security concerns in multi-tenant systems
  • Experience with and interest in technical writing
  • Interest in open source contribution

Work Hours:

  • This position will require you to be available during core business hours. 

Work Location(s) & Travel Requirements: 

This position is open to the following preferred office locations:

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

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


The estimated salary range for this position is $195,720 to $244,640.

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 match) and an Employee Stock Purchase Program. For 2024, we offer 10 paid local holidays, 11 paid company wellness days. 

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 love distributed teams. Fastly’s home-base is in San Francisco, but we have multiple offices and employees sprinkled around the globe. As a new hire, you will be able to attend our IN-PERSON new hire orientation in our San Francisco office! It is an exciting week-long experience that we offer to new employees to build connections with colleagues across Fastly, participate in hands-on learning opportunities, and immerse yourself in our culture firsthand. 

  • 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.

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.

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 [email protected] or 501-287-4901. 

Fastly collects and processes personal data submitted by job applicants in accordance with our Privacy Policy. Please see our privacy notice for job applicants.


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