Yosevu Kilonzo - Full Stack Engineer at Primum

Yosevu Kilonzo

Full Stack Engineer at Primum

Sioux Falls, South Dakota, United States

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Summary

🤩

Rockstar

🎓

Top School

Yosevu Kilonzo is a full-stack engineer with a decade of experience building web and cross-platform mobile apps using React Native, Next.js, Tailwind CSS and AWS. Based in Sioux Falls, he has contributed to design-system work at scale, including migrating Spectrum CSS components to core tokens on Adobe’s spectrum-css repository. His background spans startups and consultancies where he’s led responsive frontend builds, enrollment and patient portals, and prototype AI chat integrations using LangChain and OpenAI. At Sparkbox he balanced hands-on engineering with mentoring, accessibility, testing, and DevOps-heavy projects, developing a pragmatic consultant mindset. Trained in linguistics and English, he brings strong communication and curriculum-style clarity to product-focused engineering. He’s as comfortable shipping UI components as he is shaping integrations that turn research proofs-of-concept into production-ready features.

10 years of coding experience

5 years of employment as a software developer

Bachelor of Arts - BA, English Language and Literature/Letters, 3.641, Bachelor of Arts - BA, English Language and Literature/Letters, 3.641 at Northern State University

Master of Arts (M.A.), Linguistics for TESOL, 3.87, Master of Arts (M.A.), Linguistics for TESOL, 3.87 at University of Colorado Boulder

English, Swahili, Korean

Github Skills (7)

css10

system10

system-design10

carbon-design-system10

sys10

tokenizer9

tokenize9

Programming languages (14)

CSSRustGoHTMLReasonTypeScriptDockerfileShell

Github contributions (5)

adobe/spectrum-css

Jun 2022 - Dec 2022

The standard CSS implementation of the Spectrum design language.

Role in this project:

Front-end Developer

Contributions:100 reviews, 149 commits, 17 PRs in 5 months

Contributions summary:Yosevu primarily contributed to the migration of various CSS components within the `spectrum-css` repository to core tokens. Their work involved updating the styling of components such as `closebutton`, `statuslight`, `toast`, `buttongroup`, `checkbox`, `tabs`, `swatch`, `swatchgroup`, `inlinealert`, `pickerbutton`, `link`, and `progressbar`. This included updating existing styles and incorporating new features, modifiers and removing existing ones.

csslanguage-designspectrumdesign-systemthe-standard

bantuist/bloc-jams

Aug 2016 - Jun 2017

Contributions:7 PRs, 126 pushes, 29 branches in 9 months

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