Senior Engineer - VCL Compiler

Fastly
New York, Denver, San Francisco
Workplace: HybridFull timeUSD 181,220 - 217,464 annuallyFunction: Solutions Engineering & Sales EngineeringExperience: 5+ yearsSkills: ["Written communication","Collaboration","Attention to detail"]

Build and evolve the VCL Compiler that powers how customers configure and customize edge logic. You’ll refactor and modularize a C-based compiler architecture, redesign parsing/AST components, and deliver new language features while preserving backward compatibility. Own the testing and validation pipeline to protect stability at extreme scale, collaborate on cross-functional architecture decisions, and produce clear technical documentation for internal teams and external users.

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FursaFursa
Fastly
Fastly
1 week ago

Senior Engineer - VCL Compiler

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Source: Company careers pageValidated by: Fursa AI
Last checked: 4 hours agoStatus: Live

Job Summary

Build and evolve the VCL Compiler that powers how customers configure and customize edge logic. You’ll refactor and modularize a C-based compiler architecture, redesign parsing/AST components, and deliver new language features while preserving backward compatibility. Own the testing and validation pipeline to protect stability at extreme scale, collaborate on cross-functional architecture decisions, and produce clear technical documentation for internal teams and external users.
Location: New York, Denver, San Francisco
Workplace: Hybrid
Employment Type: Full time
Job Function: Solutions Engineering & Sales Engineering
Seniority: Mid level

Key Responsibilities

  • •Design and implement VCL language extensions, syntax updates, and new compiler features.
  • •Rework parsing and AST components to improve long-term maintainability.
  • •Refactor and modularize the compiler codebase to reduce complexity and improve stability.
  • •Own testing and validation to ensure compiler changes don’t break existing customer code.
  • •Collaborate with cross-functional teams and write clear technical documentation for internal teams and external users.

Pay and Benefits

Salary: USD 181,220 - 217,464 annually
Perks:Health InsuranceDentalVision401kEquityEapPaid Leave

Key Requirements

  • •Significant production engineering experience writing C in POSIX/Linux environments.
  • •Strong compiler internals knowledge, including parsing, AST design, intermediate representations, and code generation.
  • •Experience refactoring and simplifying established codebases while maintaining backward compatibility.
  • •Track record of comprehensive testing practices and CI/CD with a stable, production-grade build pipeline.
  • •Ability to communicate clearly through technical documentation and collaborate across cross-functional teams.
Experience:5+ yearsEdge computingCDNCompiler technology
Skills:Written communicationCollaborationAttention to detail
Languages:English
Tech Stack:CPOSIXLinuxCI/CDVCLASTParsingCode generation

Company Brief

Fastly
Provides an edge cloud platform and content delivery network (CDN) that enables fast, secure, and scalable delivery of web and streaming content, APIs, and applications with real-time configurability and observability.
Industry: Cloud Computing
Company Size: Enterprise (1,001+ employees)
Revenue: USD 250M to 500M
Growth: Public Company
Valuation: Public Company (Market Cap in USD)
Funding: IPO / Publicly Listed
Headquarters: San Francisco, United States
Founded: 2011
WebsiteLinkedIn