John Bucy
Software Engineer at Koukan (Cloud-Native Email stack)
San Francisco, California, United States
Summary
🤩
Rockstar🎓
Top SchoolJohn Bucy is a systems-focused software engineer in San Francisco who builds resilient storage, networking, API and middleware for distributed systems. He has deep experience modernizing legacy infrastructure—at Google he led the Gmail delivery stack's shift from build-out to long-term maintainability, rearchitecting queueing, memory management and threading to dramatically reduce complexity and improve scalability. He built a Bigtable-based client IP reputation signal that enabled Gmail open signups, developed a JSON codec for RFC822/MIME and prototyped an Envoy SMTP STARTTLS filter while exploring decoupled email delivery. Now at Koukan he is tackling email gateway challenges for cloud-native environments, replacing UNIX mailers and SMTP patterns with REST-friendly, k8s-native alternatives. A Carnegie Mellon alumnus, he has a knack for turning messy, unmaintainable systems into stable, observable platforms and often surfaces correctness issues in underlying storage through pragmatic consistency checks.
6 years of coding experience
18 years of employment as a software developer
Master of Science - MS, Computer Engineering, Master of Science - MS, Computer Engineering at Carnegie Mellon University
Github Skills (25)
kubernetes10
proxy10
accelerator10
containers10
golang10
high-performance10
cloud-native10
programming-language9
smtp-server9
python9
smtp9
lmtp9
smtpd9
mta9
reimplementation9
Programming languages (2)
Github contributions (5)
jsbucy/envoy
Feb 2020 - Aug 2023
Cloud-native high-performance edge/middle/service proxy
Contributions:2 PRs, 31 pushes, 2 branches in 3 years 6 months
golangproxyedgeload-balancingperformance
jsbucy/koukan
Sep 2024 - Apr 2025
Contributions:19 pushes, 1 branch, 2 comments in 6 months
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