Guillermo Siliceo
Fractional CTO at Pilou
Mexico City
Summary
👤
Senior🎓
Top SchoolGuillermo Siliceo is a seasoned engineering leader and founder with 13–14 years building and scaling products across crowdfunding, e-commerce, marketplaces, B2B services, web3 security, and healthcare. He combines hands-on fullstack craftsmanship—especially Ruby on Rails, React and Next.js—with proven team-building as a Fractional CTO and former startup CTO/cofounder who shipped multiple initial product versions from scratch. At Immunefi he turned a distributed engineering organization into the company’s fastest delivery engine by introducing SDLC metrics, technical debt governance, and dynamic prioritization models that materially influenced business pivots. He has a track record of cost-saving integrations and rapid upgrades in legacy systems, and is comfortable moving between code, architecture, and executive strategy. Based in Mexico City, Guillermo blends entrepreneurial grit with operational discipline, often stepping into high-ambiguity situations to make product teams both faster and more predictable.
12 years of coding experience
17 years of employment as a software developer
Sistema de Información Administrativa, Sistema de Información Administrativa at Universidad de Guanajuato
Spanish, English, French
Github Skills (113)
vision-api10
activemodel10
spree9
html9
ruby9
python9
mvc9
deep-learning9
machine-learning9
rails9
api8
github-app8
todoist8
activerecord8
ruby-on-rails8
Programming languages (10)
Github contributions (5)
grillermo/.vim
Oct 2020 - Feb 2022
Contributions:32 commits, 10 pushes, 1 branch in 1 year 4 months
aliada-mx/rails_admin
Apr 2015 - Jan 2019
Contributions:1 PR, 19 pushes, 2 branches in 3 years 9 months
railsrails-enginerailsadminruby
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