Marcellino Ornelas
Staff Software Engineer at Slack
San Francisco, California, United States
Summary
🤩
Rockstar🎓
Top SchoolMarcellino Ornelas is a Staff Software Engineer in San Francisco with eight years of hands-on experience building full-stack web applications and evolving into a technical leader at Slack. He rose through multiple engineering levels at Slack since 2018, combining front-end finesse with practical DevOps sensibilities to deliver responsive, user-centered features at scale. Trained at immersive programs like Hack Reactor and General Assembly, he pairs formal bootcamp rigor with real-world product delivery and mentoring experience from his tutor roles. Outside of core work he contributes open-source templates and stays current on web trends, bringing a tinkerer’s mindset—whether refining UI interactions or experimenting on cars—to solve complex problems. Colleagues know him for translating design intent into clean, maintainable code and for steadily expanding scope from implementation to architecture.
8 years of coding experience
8 years of employment as a software developer
Advanced Software Engineering Immersive Computer Software Engineering, Advanced Software Engineering Immersive Computer Software Engineering at Hack ReactorComputer Software Engineering, Computer Software Engineering at General Assembly
Stackoverflow
84reputation
11kreached
10answers
0questions
Github Skills (181)
datetime10
visual-studio-code-extension10
hierarchy10
reporter10
org-chart10
webextension10
timepicker10
d3-tree10
datepicker10
datetimepicker10
daterange10
typescript10
dev-server10
daterangepicker10
organization-chart10
Programming languages (7)
Github contributions (5)
marcellino-ornelas/create-components-react
Mar 2018 - Feb 2019
Contributions:50 commits, 5 PRs, 69 pushes in 11 months
marcellino-ornelas/templates
Feb 2019 - Aug 2025
Templates is a powerful filesystem generator that aims to simplify the process of getting started with and maintaining code applications.
Contributions:44 releases, 486 PRs, 1367 pushes in 6 years 7 months
filesystembuild-toolsgeneratortemplatetemplates
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