Ian Duggan
Independent Engineer at Twitch Interactive, Inc.
San Francisco, California, United States
Summary
👤
Senior🎓
Top SchoolIan Duggan is an independent engineer and founder with 17 years of experience building high-scale distributed systems, ML platforms, search, and recommendation engines—most notably leading rearchitecture and ML platform efforts at Twitch for a 15M DAU product. He combines hands-on IC work with systems architecture, people leadership, and company building through AnythingSocial and consulting, and has run a profitable restaurant business that honed his cost-aware, failure-tolerant design instincts. Currently focused on AI agent quality, Ian is researching formal specifications, multi-agent orchestration, and a "Software Agent Constitution" to encode staff/principal-level engineering judgment for LLM coding agents. Technically fluent across Go, Elixir, Ruby, Nix and infrastructure tooling, he has reimplemented production Rails apps in Elixir and contributed to Ruby tooling like annotate_models. He gravitates toward foundational problems where thoughtful design reduces long-term operational risk and enjoys applying formal methods (TLA+, Quint) to emergent AI systems. Based in San Francisco with MIT degrees in EECS, he’s equally likely to be found playing hockey or tuning a guitar when not shipping systems.
17 years of coding experience
23 years of employment as a software developer
S.M. Engineering, Electrical Engineering and Computer Science, S.M. Engineering, Electrical Engineering and Computer Science at Massachusetts Institute of Technology
Spanish
Github Skills (6)
activerecord10
ruby-rails10
rails10
ruby10
rake8
factory-bot7
Programming languages (15)
Github contributions (5)
ctran/annotate_models
Dec 2011 - Dec 2011
Annotate Rails classes with schema and routes info
Role in this project:
Back-end Developer
Back-end DeveloperContributions:6 commits in 1 day
Contributions summary:Ian primarily focused on enhancing the `annotate_models` gem. Their work included adding support for Fabrication fabricators, fixing options parsing to correctly handle boolean values and changing the annotation to use the options hash. The user also merged branches and integrated new features such as allowing task loading from a Rakefile and adding an option to skip database migrations. The contributions indicate enhancements to the core functionality of the gem.
railsannotaterubyroutesactiverecord
ijcd/ragel_playground
Nov 2015 - May 2021
Volt app for messing around with Ragel.
Contributions:23 commits, 3 PRs, 7 pushes in 5 years 7 months
voltragel
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