Guillermo Pérez
Senior Engineering Lead at Mattermost
Torrejón de Ardoz, Community of Madrid, Spain
Summary
🤩
Rockstar🎓
Top SchoolGuillermo Pérez is a Senior Engineering Lead with 14 years building and leading product-focused teams, currently managing hybrid engineering and customer support groups at Mattermost from Madrid. He blends hands-on full-stack and backend development with people leadership, having progressed from contributor roles to CTO-level responsibilities in startups and scale-ups. A prolific open-source contributor, Guillermo has shipped features across the Mattermost ecosystem—including session management, unread-channel APIs, desktop and mobile UX fixes—and contributed to language tooling like Hy. He excels at taking ambiguous problems through design to implementation, comfortable across databases, caches, APIs, and UI layers. His background includes founding/CTO duties at Ride On Consulting and a Master in Problem Solving, reflecting both technical depth and a methodical approach to complex systems. Unexpectedly, he also trained in animal-assisted therapy, a detail that hints at a pragmatic, empathetic leadership style.
14 years of coding experience
15 years of employment as a software developer
Programming Certificate Option, Programming Certificate Option at Montgomery CollegeMaster on Problem Solving, Master on Problem Solving at Universidad Internacional de La Rioja (UNIR)Técnico en Terapia Asistida con Animales, Zooterapia/Terapia asistida con animales, Técnico en Terapia Asistida con Animales, Zooterapia/Terapia asistida con animales at Fundación BocalánIngeniería, Computer Science, Ingeniería, Computer Science at Universidad Politécnica de Madrid
English
Stackoverflow
475reputation
48kreached
10answers
4questions
Github Skills (55)
markdown10
javascript10
ios10
restructuredtext10
react-native10
python10
apidoc10
back-end-development10
electron10
testing10
macros10
databases10
typescript10
rs10
user-interface10
Programming languages (14)
Github contributions (5)
mattermost/desktop
Aug 2019 - Aug 2022
Mattermost Desktop application for Windows, Mac and Linux
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:7 releases, 366 reviews, 397 commits in 3 years
Contributions summary:Guillermo's contributions primarily focused on enhancing the Mattermost Desktop application. They addressed issues related to window management, including allowing negative window positions and preventing known teams from opening new windows. Additionally, the user implemented features such as client certificate selection, and file extension selection during downloads. Their work also extended to improving the user interface, adding a back button and enhancing the context menu, and improving release process.
desktop-applicationelectronmattermost-desktopwindowslinux
mattermost/mattermost-webapp
Jul 2019 - Jul 2022
Archived web app of Mattermost. Moved to the monorepo: https://github.com/mattermost/mattermost
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:506 reviews, 76 commits, 179 PRs in 3 years
Contributions summary:Guillermo primarily contributed to the web application's frontend and backend, evidenced by changes across components, actions, reducers, and utilities within the Mattermost webapp repository. Their work included implementing features like session revocation, marking posts as unread, and enabling Latex rendering. The contributions also involved reordering and modifying dot menu items, and integrating websocket functionality, displaying a solid understanding of the application's architecture.
webapphttps-servermattermostmattermost-server
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