Sullivan
Two Sigma
Third-party WCAG 2.1 AA audit remediation · site-wide animation control · Three.js hero
Hailey (Heayeon) Yoon
UX Engineer • Accessibility • Front-End
I build the front end of agency work — taking designers’ files into production interfaces. Everything shown here is work I built. These are agency projects — the design came from the studio’s designers, and other developers worked on the same sites — so each project here covers my components, not the entire site.
Selected Work
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SullivanPantheon
Keyboard-operable global navigation · Vue post filtering · GSAP scroll sections
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SullivanMade for This, Duke
Built on my starter theme
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SullivanCrown Castle ESG Charts
A JSON-driven chart component family — bar, donut, donut-with-table
More Work
Client sites shipped at Sanborn, Rauxa, and Sullivan.
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SullivanMillenium
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SullivanWorldQuant
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SullivanUnstoppable SBU
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SullivanWorldquant Millennium Advisors
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RauxaBristol-Myers Squibb
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SanbornOprah Magazine
OMag Insider -
SanbornIBM Security
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SanbornDKNY MYNY
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SanbornMLS Works
Community MVP Contest -
SanbornMacallan + Wired Brand Lab
Two Worlds -
SanbornDrug Free
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SanbornGirl Scouts
Be the Video Game Developer -
SanbornLA Galaxy
3rd Jersey Kit Contest -
SanbornAsics
Treadmill Game -
SanbornConde Nast Traveler
Shorties -
SanbornInnovid
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SanbornTeen Vogue Summit
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SanbornGirl Scouts
Eco Dream House -
SanbornDKNY Be Creative
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SanbornDonnaKaran
Her Scent