Antonio Marcedone
Principal Security Architect, Cryptography at Zoom
New York, New York, United States
Summary
🤩
Rockstar🎓
Top SchoolAntonio Marcedone is a senior secure software engineering leader with 11 years of hands-on cryptography and security experience, currently scaling cryptography teams and programs at Zoom. He holds a PhD in cryptography from Cornell and has practical experience implementing and hardening real-world crypto systems at Keybase—contributing to widely used projects like Saltpack and the Keybase client. Antonio blends academic rigor with production focus, having designed secure messaging primitives, improved decoding robustness, and implemented team encryption and audit features. His background includes privacy-preserving machine learning prototypes at Google and Key Transparency work at Snap, reflecting a strong intersection of applied crypto, secure systems, and privacy. Colleagues describe him as a manager who still ships code and drives technical correctness across complex distributed systems.
11 years of coding experience
11 years of employment as a software developer
Diploma di Licenza Magistrale, Diploma di Licenza Magistrale at Scuola Superiore di CataniaDoctor of Philosophy (PhD), Computer Science, Doctor of Philosophy (PhD), Computer Science at Cornell UniversityMaster's degree, Mathematics, Master's degree, Mathematics at Università di Catania
English, Italian
Github Skills (12)
team-management10
error-handling10
go10
cryptography10
security10
encryption9
microsoft-teams9
api8
audit8
apidoc8
auditing8
distributed-systems7
Programming languages (8)
Github contributions (5)
keybase/client
May 2018 - May 2020
Keybase Go Library, Client, Service, OS X, iOS, Android, Electron
Role in this project:
Back-end Developer
Back-end DeveloperContributions:4 reviews, 85 commits, 126 PRs in 1 year 11 months
Contributions summary:Antonio primarily worked on improving the Keybase client, focusing on features related to team encryption, auditing, and handling invite links. Their work involved modifying server-side logic and related code. They implemented changes to manage and verify these interactions in the team context. Additionally, they addressed some core issues with the existing codebase.
androidelectrongoioskeybase
keybase/saltpack
May 2018 - Aug 2018
a modern crypto messaging format
Role in this project:Back-end Developer
Back-end DeveloperContributions:11 commits, 4 PRs, 8 pushes in 2 months
Contributions summary:Antonio primarily focused on improving the `saltpack` library, a crypto messaging format. Their contributions include fixing misleading comments, enhancing error handling during decoding by allowing initial blocks to decode even if the full message is invalid, and automatically implementing frame checking, thereby improving the robustness of the decoding process. They also introduced length limits for frames and brands and expanded message classification logic.
crypto
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