Will Childs-klein
Software Development Engineer III at Amazon Web Services (AWS)
Boston, Massachusetts, United States
Summary
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Rockstar🎓
Top SchoolWill Childs-klein is a Software Development Engineer III with 12 years of experience building secure, production-grade systems at AWS, currently focused on cryptography and TLS work in AWS Cryptography. He has deep hands-on experience integrating post-quantum KEMs (Kyber family) into the s2n-tls library and hardening Python's ssl module to work with OpenSSL forks like AWS-LC and BoringSSL. Will’s background spans storage and data-transfer services (DataSync, Storage Gateway, EFS) as well as applied cryptography education as a TA at NYU Tandon, reflecting both practical system design and teaching ability. He combines rigorous security engineering and QA skills with open-source contributions to high-profile projects, bringing a pragmatic approach to compatibility and API migration challenges.
12 years of coding experience
8 years of employment as a software developer
Master of Science - MS Cybersecurity, Master of Science - MS Cybersecurity at NYU Tandon School of EngineeringBachelor of Science (B.S.) Computer Science, Bachelor of Science (B.S.) Computer Science at Yale University
French, English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (20)
ssl10
tls1210
python10
it-security10
c1110
tls1310
security10
c1710
post-quantum-cryptography10
mtls10
security-testing10
openssl10
cryptography10
libtls10
encryption10
Programming languages (9)
Github contributions (5)
aws/s2n-tls
Feb 2023 - Jun 2024
An implementation of the TLS/SSL protocols
Role in this project:
Security Engineer
Security EngineerContributions:104 reviews, 3 PRs, 106 comments in 1 year 4 months
Contributions summary:Will primarily worked on integrating and improving Post-Quantum (PQ) cryptography within the s2n-tls library. Their commits involved migrating and refactoring code to utilize the EVP KEM API, specifically focusing on Kyber512, Kyber768, and Kyber1024. They also addressed issues related to AWS-LC versions and API compatibility, ensuring the correct detection and support for PQ KEMs at runtime. Furthermore, the user added tests and security policies related to Kyber implementations.
cryptographysslc99tlscrypto
python/cpython
Aug 2023 - Mar 2025
The Python programming language
Role in this project:Security Engineer & QA Engineer
Security Engineer & QA EngineerContributions:12 reviews, 8 PRs, 23 comments in 1 year 8 months
Contributions summary:Will's contributions primarily focused on enhancing the security and robustness of the Python `ssl` module within the CPython repository. They made significant changes to the test suite, specifically targeting SSL-related tests to accommodate OpenSSL forks like AWS-LC and BoringSSL, and added checks for TLSv1.3 post-handshake authentication support. They also implemented tests to verify the behavior of the ssl module under various conditions, including verifying certificate verification failures.
python-programmingprogramming-languagepythonpython-programming-language
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