John Maguire
Staff Software Engineer at Defined Networking
Detroit Metropolitan Area United States
Summary
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Rockstar🎓
Top SchoolJohn Maguire is a Staff Software Engineer with 13 years of experience building secure, production-grade distributed systems and networking software from the Detroit area. He specializes in backend and security engineering, with hands-on experience across Go, Python, mobile (Swift/Kotlin/Flutter), and AWS infrastructure automation. At Defined Networking he designs mesh overlay VPNs and builds APIs and mobile clients, and his open-source contributions to the widely used Nebula project demonstrate deep attention to key management, cross-platform compatibility, and hard-to-debug stability issues. Previously at Duo Security and Barracuda he delivered cloud-hosted and on-premise SSO and zero-trust solutions, often owning both feature development and SRE responsibilities. Colleagues know him for pragmatic security design, mentoring, and surfacing subtle platform bugs (e.g., Android build hangs and FreeBSD tun naming) that improve reliability for many users.
13 years of coding experience
10 years of employment as a software developer
Associate's degree, Liberal Arts Transfer, Associate's degree, Liberal Arts Transfer at Washtenaw Community College
Stackoverflow
2,244reputation
466kreached
40answers
19questions
Github Skills (19)
freebsd10
networking10
security10
go10
cryptography9
android9
ssh9
dns8
firewall8
dockers7
docker7
html6
socket6
php6
htaccess6
Programming languages (25)
Github contributions (5)
slackhq/nebula
Feb 2021 - Jan 2023
A scalable overlay networking tool with a focus on performance, simplicity and security
Role in this project:
Back-end & Security Engineer
Back-end & Security EngineerContributions:54 reviews, 15 commits, 84 PRs in 1 year 11 months
Contributions summary:John primarily contributed to the security and stability of the Nebula overlay network. Their work included fixing a hang issue in the Android build, making DNS queries case-insensitive, adding support for SSH CAs, and improving the handling of firewall rules. Moreover, the user implemented features to encrypt CA private keys, and added support for naming FreeBSD tun devices, reflecting a focus on secure key management and platform compatibility. They also addressed bugs related to certificate verification and network configuration.
networkingsecurity
JohnMaguire/pplugins
Jan 2016 - Jan 2021
Contributions:65 pushes, 9 branches, 7 tags in 5 years 1 month
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