Shiloh Heurich
Principal Security Engineer at Fastly
San Francisco, California, United States
Summary
👤
Senior🎓
Top SchoolShiloh Heurich is a Principal Security Engineer in San Francisco with 11 years of focused experience building cryptographic and identity systems at internet scale. He co-founded and led a publicly trusted Certification Authority integrated into major root stores, driving HSM selection, physical and logical site security, and operational policy for key material protection and cryptographic log integrity. Comfortable taking greenfield projects from concept to production, he blends hands-on Go and Python development with systems architecture, incident response, and cross-functional vendor integration. His contributions to the widely used Boulder ACME codebase and upstream PKI toolchains reflect a practical open-source mindset that improved CA stability and certificate handling. Shiloh’s background spans commercial and government work—from NASA systems architecture to cloud security at Fastly, Cloudflare, Twitter and Salesforce—giving him rare depth in authentication, authorization and high-availability design. He combines rigorous operational discipline with an engineer’s attention to detail, evidenced by bug fixes, test-race remediation, and clear documentation in critical security software.
11 years of coding experience
23 years of employment as a software developer
Master of Engineering - ME (incomplete) Systems Engineering, Master of Engineering - ME (incomplete) Systems Engineering at University of Maryland
Stackoverflow
31reputation
8kreached
1answer
0questions
Github Skills (16)
testing10
mtls10
go10
tls1210
certificate-authority10
acme10
tls1310
pki10
libtls10
cryptography9
debugging9
git8
dockers7
docker7
google-cloud-storage6
Programming languages (11)
Github contributions (5)
letsencrypt/boulder
Jun 2018 - Jun 2020
An ACME-based certificate authority, written in Go.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:25 reviews, 3 commits, 21 PRs in 1 year 11 months
Contributions summary:Shiloh focused on enhancing the `boulder` project's certificate authority functionality. They implemented features related to certificate profiles, ensuring correct handling of OCSP and CRL URLs for intermediate certificates. Their work included fixing output formatting in certificate generation and addressing data races in the test server, improving the stability and reliability of the system. The user also corrected comments, and fixed typos, demonstrating attention to detail in both code and documentation.
certificate-authoritygoboulderacmetls
sheurich/sheurich.github.io
May 2022 - Jan 2026
Contributions:1 PR, 6 pushes, 1 branch in 3 years 8 months
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