Cixtor _
Senior Security Software Engineer (IC5) at Microsoft
Seattle, Washington, United States
Summary
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RockstarCixtor is a Senior Security Software Engineer (IC5) based in Seattle with 15 years in industry and over a decade focused on building secure, reliable, and scalable distributed systems. Currently conducting AI research for cybersecurity products at Microsoft, he blends low-level systems expertise with cloud infrastructure and ML interests. His extensive open-source contributions to flagship Go repositories (golang/go, net, crypto, sys) show deep familiarity with OS internals, networking, and cryptography—fixing syscalls, socket options, and subtle networking bugs. Prior roles span SRE and systems engineering at Yelp, Apple, GoDaddy, and game studio Klei, reflecting a pattern of solving production reliability challenges across diverse environments. Colleagues would note his uncommon combination of hands-on systems debugging at the OS level and strategic work on security and cloud-scale architectures.
15 years of coding experience
9 years of employment as a software developer
Spanish, English
Github Skills (24)
socket-io10
testing10
network-programming10
networking10
system-calls10
socket10
go10
sys10
ipv410
cryptography10
ssh10
operating-system10
assembly9
b2b9
assemble9
Programming languages (20)
Github contributions (5)
golang/net
Sep 2015 - Oct 2018
[mirror] Go supplementary network libraries
Role in this project:
Back-end Developer
Back-end DeveloperContributions:177 commits in 3 years
Contributions summary:Cixtor primarily contributed to the implementation of core network library functionalities within the Go language. They introduced a new package for IPv4 socket options, including methods for raw IP socket access, and they worked on adding and adjusting existing socket option handling such as the IP_STRIPHDR option for better performance on some platforms. The user made improvements to existing code, fixed bugs, and generally maintained the network libraries.
golangospfnetworkingbgpsdn
golang/crypto
Dec 2012 - Dec 2016
[mirror] Go supplementary cryptography libraries
Role in this project:Back-end Developer
Back-end DeveloperContributions:7 commits in 4 years
Contributions summary:Cixtor primarily focused on making code improvements and fixing typos within the `golang/crypto` repository. They addressed issues in the ssh, chacha20poly1305 and blake2b packages, with the most prominent being in the ssh package. They also added BSD variant support in the ssh/terminal package.
golangcryptographyencryptionaes-gcm
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