George Guimarães
Member Of Technical Staff at New Generation
São Paulo, Brazil
Summary
🤩
Rockstar🎓
Top SchoolGeorge Guimarães is a hands-on tech leader and repeat founder with 17+ years of experience building scalable products, companies, and engineering teams from São Paulo. He co-founded Plataformatec (the company behind Elixir) and SourceLevel, blending deep Elixir/BEAM expertise with product and GTM ownership to ship Engineering Ops and developer-focused platforms. Most recently he architected sub-100ms LLM agents, in-memory RAG pipelines, and ISO8583-enabled payment systems that support millions of merchants across Brazil and the US. He operates at the intersection of engineering, product, and GTM—leading cross-functional squads, recruiting senior talent, and turning data streams into live delivery metrics. An active open-source contributor, he has contributed documentation and clarity improvements to widely used Ruby projects like Devise, reflecting a pragmatic focus on developer experience. He’s now shaping “Agentic Commerce,” bringing founder’s bias for action to next-generation e-commerce systems.
17 years of coding experience
20 years of employment as a software developer
Master of Business Administration (M.B.A.) Finance, Master of Business Administration (M.B.A.) Finance at Insper Instituto de Ensino e PesquisaBachelor of Engineering - BE Automation and Control Engineering, Bachelor of Engineering - BE Automation and Control Engineering at Escola Politécnica da USPFellow Entrepreneurship/Entrepreneurial Studies, Fellow Entrepreneurship/Entrepreneurial Studies at Latitud
English, Portuguese
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (8)
ruby-rails10
user-authentication10
authentication10
devise10
rails10
ruby10
documentation9
bcrypt9
Programming languages (16)
Github contributions (5)
heartcombo/devise
Oct 2009 - Feb 2017
Flexible authentication solution for Rails with Warden.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:19 commits, 11 PRs, 10 pushes in 7 years 4 months
Contributions summary:George primarily contributed to the codebase by addressing typos, whitespace issues, and improving the documentation of the Devise gem. They corrected comments within the initializer, ensuring the examples accurately reflected the default options. They also refactored the documentation to consistently use "hashing" terminology instead of "encryption", enhancing clarity. Furthermore, the user fixed minor issues and rebased merged commits.
wardenrailsrails-engineauthenticationruby
plataformatec/linters
Nov 2016 - Jul 2019
Linters and static analysis configuration files
Contributions:9 commits, 5 PRs, 7 pushes in 2 years 8 months
linterlintlinterslintingconfiguration-files
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