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About the Role

Fastly's edge cloud platform enables customers to create great digital experiences quickly, securely, and reliably by processing, serving, and securing applications as close to end-users as possible. We are looking for a Compiler Engineer to join our Core Platform team to help shape, scale, and maintain the VCL Compiler (VCC) and Varnish Configuration Language (VCL). VCL is central to how customers configure and customize their edge logic at scale.

Responsibilities

Design and implement VCL language extensions, syntax updates, and new compiler features
Perform parsing and AST rework to improve long-term maintainability of the compiler
Refactor and modularize the existing compiler codebase to reduce complexity and improve stability
Own the testing and validation pipeline to ensure compiler changes do not break existing customer code
Collaborate with cross-functional teams to align on architecture and technical direction
Write clear technical documentation for internal teams and external users

Requirements

Significant domain-relevant engineering experience (at least 5 years)
Significant production experience writing C, with knowledge of POSIX/Linux environments
Solid understanding of compiler internals: parsing, AST design, intermediate representations, code generation
Experience simplifying and refactoring established codebases while maintaining backward compatibility
Track record of comprehensive testing practices, CI/CD, and treating the build pipeline as production infrastructure
Good written communication skills, with the ability to produce clear technical documentation
A collaborative mindset with experience working across cross-functional teams

Skills

C
POSIX/Linux environments
Compiler internals
Parsing
AST design
Intermediate representations
Code generation
Backward compatibility
Testing practices
CI/CD
Technical documentation
Cross-functional collaboration
Varnish
VCL
CDN/edge computing infrastructure
Domain-specific language (DSL) design

Location

New York, NY
Denver, CO
San Francisco, CA
US (Remote for exceptionally qualified candidates)

Work Type

Hybrid
Remote

Experience Level

Senior

Salary/Compensations

$181,220 to $217,464

Benefits

Medical, dental, and vision insurance
Family planning
Mental health support
Employee Assistance Program
Life, Disability, and Accident Insurance
Flexible Vacation policy
Up to 18 days of accrued paid sick leave
401(k) (including company match)
Employee Stock Purchase Program
11 paid local holidays
12 paid company wellness days

About the Company

Fastly helps people stay better connected with the things they love.
We're building a more trustworthy Internet.
We have a huge impact. Fastly is a small company with a big reach.
We support a growing number of open source projects and initiatives.
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.
We are passionate. Fastly is chock full of passionate people and we’re not ‘one size fits all’.

Equal Opportunity

Pursuant to the San Francisco Fair Chance Ordinance and the Los Angeles Fair Chance Initiative for Hiring Ordinance, we will consider for employment qualified applicants with arrest and conviction records.
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 candidateaccommodations@fastly.com or 501-287-4901.