Marcel Kooi
Senior Software Engineer at Jakib.AI
Columbus, Ohio, United States
Summary
👤
Senior🎓
Top SchoolMarcel Kooi is a Senior Software Engineer with a decade of experience building web applications across healthcare, AI, and logistics domains from Columbus, Ohio. He’s fluent in JavaScript/TypeScript, React, Node, GraphQL, Ruby on Rails, and PostgreSQL, and has moved up through roles from instrumentation engineering into senior product-facing engineering positions. Marcel has a track record of improving user experience and front-end polish—evidenced by contributions to the human-essentials open-source inventory app—while also delivering backend and full-stack features at startups like Uplift, Sidecar, and PatientIQ. Comfortable in fast-paced environments, he recently transitioned into AI-focused work at Jakib.AI after helping scale systems at PatientIQ. His chemical engineering background gives him a systems-oriented approach to debugging and optimization that complements his product sensibility.
10 years of coding experience
12 years of employment as a software developer
Bachelor of Science Chemical Engineering, Bachelor of Science Chemical Engineering at Ohio University
Spanish, English
Github Skills (9)
html10
css10
javascript10
ruby-on-rails10
ui-design9
rails9
open-source9
ruby-rails7
nom7
Programming languages (13)
Github contributions (5)
rubyforgood/human-essentials
Jun 2018 - Nov 2018
Human Essentials is an inventory management system for diaper, incontinence, and period-supply banks. It supports them in distributing to partners, tracking inventory, and reporting stats and analytics.
Role in this project:
Front-end Developer
Front-end DeveloperContributions:6 commits, 5 PRs, 4 pushes in 4 months
Contributions summary:Marcel primarily focused on front-end development tasks, specifically updating the user interface of the Human Essentials application. Their contributions involved modifying the layout and content of the landing page, including testimonials and the footer. They also fixed image paths and updated the logo, demonstrating a focus on visual elements and user experience. Additionally, the user made a change to the main Javascript file.
inventorymanagement-systemstatisticsinventory-management-systemflows
marcelkooi/MoreDrillsWithRSpec
Jan 2016 - Aug 2020
A beginner introduction to RSpec
Contributions:1 push, 2 branches in 4 years 8 months
rspecrailsruby
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