Jakub Warmuz
Senior Software Engineer at Google
Zurich, Zurich, Switzerland
Summary
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Rockstar🎓
Top SchoolJakub Warmuz is a Senior Software Engineer based in Zurich with 16 years of experience building reliable, secure infrastructure and backend systems. He has deep SRE and backend expertise from a long tenure at Google and contributed core ACME and challenge-handling work to Let's Encrypt and Certbot, addressing security vulnerabilities and protocol-compliance in widely used open-source tooling. Comfortable across Python, Go, and systems-level networking, he blends hands-on implementation with protocol design and automation at scale. Early roles rebuilding enterprise networks and running college IT services give him practical ops instincts that complement his production-grade software craftsmanship. He’s the kind of engineer who moves between shipping robust cloud services and quietly hardening the open-source foundations that power web security.
16 years of coding experience
10 years of employment as a software developer
25th Bilingual Junior High School in SosnowiecMCompSci Computer Science, MCompSci Computer Science at University of OxfordMaths Physics IT, Maths Physics IT at Stanisław Staszic 4th High School in Sosnowiec
Polish, English, Russian, German
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (14)
mtls10
acme-protocol10
go10
tls1210
certificate-authority10
python10
tls1310
openssl10
cryptography10
acme10
libtls10
security10
testing9
rfc8
Programming languages (4)
Github contributions (5)
certbot/certbot
Nov 2014 - Apr 2016
Certbot is EFF's tool to obtain certs from Let's Encrypt and (optionally) auto-enable HTTPS on your server. It can also act as a client for any other CA that uses the ACME protocol.
Role in this project:
Back-end Developer & Security Engineer
Back-end Developer & Security EngineerContributions:1197 commits, 267 PRs, 7 pushes in 1 year 4 months
Contributions summary:Jakub primarily addressed security vulnerabilities and refined the ACME client, specifically within the context of certificate issuance. The user was also involved in the development of HTTP/TLS-SNI-01 challenge handling, which involved designing the code and API to create, sign, and verify new challenges. The user made changes to the manual plugin for use cases that needed to run without root. The user also created and maintained the directory structure for the tool.
actletsencryptpythonsslcertbot
letsencrypt/boulder
Jan 2015 - Apr 2016
An ACME-based certificate authority, written in Go.
Role in this project:Backend Developer
Backend DeveloperContributions:23 commits, 14 PRs, 117 comments in 1 year 2 months
Contributions summary:Jakub primarily contributed to the backend of the Boulder project, specifically focusing on the ACME protocol implementation. Their work included modifying challenge handling, adding and refining features related to the "Location" and "up" links for challenges, and updating the web front end. They also added tests for the challenge functionality and fixed build issues. This indicates a focus on the core logic and ACME protocol compliance within the certificate authority.
golangcertificate-authorityletsencryptpkilets-encrypt
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