Guillermo Trueba
Co-Founder, CTO at Tandem
Ecatepec de Morelos, State of Mexico
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.
13 years of coding experience
10 years of employment as a software developer
Graphic Design, Graphic Design at Universidad de Guanajuato
French, English, Spanish
Github Skills (80)
rails-engines10
vision-api10
rails-admin10
github-app9
html9
ruby9
mvc9
rails9
activerecord8
ruby-on-rails8
python8
deep-learning8
machine-learning8
epub7
rspec7
Programming languages (11)
Github contributions (5)
grillermo/labs
Jan 2021 - May 2026
Contributions:20 pushes, 1 branch in 5 years 4 months
grillermo/.vim
Oct 2020 - Feb 2022
Contributions:32 commits, 13 pushes, 1 branch in 1 year 4 months
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