Alexei Czeskis
Director Of Engineering at LinkedIn
Campbell, California, United States
Summary
🤩
Rockstar🎓
Top SchoolAlexei Czeskis is a Director of Engineering with 11 years of experience building and scaling security-first products, currently leading engineering at LinkedIn after recent senior leadership at ID.me. He specializes in user authentication, account recovery, and high-assurance identity systems, having driven products that doubled ARR and met NIST IAL2 requirements for large federal and commercial customers. At Google he led account security efforts including Advanced Protection and contributed to cross-industry standards like WebAuthn and U2F, with open-source cryptographic libraries and reference implementations under his belt. He has a strong academic foundation with a PhD in Computer Science focused on usable security and authentication from the University of Washington. Alexei combines hands-on backend engineering and specification work—fixing WebAuthn examples and maintaining U2F reference code—with executive experience scaling teams from 30 to 100+. Based in Campbell, CA, he pairs rigorous research background with practical operational discipline for regulated, high-traffic systems.
11 years of coding experience
14 years of employment as a software developer
Doctor of Philosophy (PhD) Computer Science, Doctor of Philosophy (PhD) Computer Science at University of WashingtonBachelor of Science (BS) Mathematics and Computer Science, Bachelor of Science (BS) Mathematics and Computer Science at Purdue University
Russian, English
Github Skills (9)
javas10
java10
documentation10
webauthn10
apidoc9
api9
security8
bouncy-castle7
javascript5
Programming languages (6)
Github contributions (5)
google/u2f-ref-code
Sep 2015 - Oct 2016
U2F reference implementations
Role in this project:
Back-end Developer
Back-end DeveloperContributions:79 commits, 69 PRs, 116 pushes in 1 year 2 months
Contributions summary:Alexei primarily focused on maintaining and updating the U2F reference implementation, making changes related to removing trailing whitespace, and synchronizing files. They contributed to refactoring the Java code, specifically within the `U2FServerReferenceImpl.java` file, ensuring code consistency. Additionally, the user updated test vectors.
implementationsu2f
w3c/webauthn
Mar 2016 - Mar 2019
Web Authentication: An API for accessing Public Key Credentials
Role in this project:Back-end Developer
Back-end DeveloperContributions:21 commits, 28 PRs, 46 pushes in 3 years
Contributions summary:Alexei primarily focused on modifying the WebAuthn specification documents. Their contributions include fixing syntax errors and updating examples. They updated the specification, clarifying usage of transport hints, and adding a FIDO appid extension. Additional changes included removing elements, and adding and clarifying authenticator options and attributes.
apipublic-keywebauthnweb-authenticationauthentication
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