I'm a frontend engineer with four years of experience building fast, accessible interfaces in React, Next.js and TypeScript. Originally from Kansas City, currently in Austin, and a former teacher before I moved into software.

• 🔭 Most recently I led frontend development at LIFO, an inventory SaaS for 105+ Square POS merchants, where I built the real-time dashboard and our Square catalog integration. Before that, two years at TrendyMinds, a digital agency, building marketing sites and reusable component libraries for 20+ enterprise clients.
• 🤖 I work with Claude Code and Cursor daily. I keep a pattern library in the repo that agents have to conform to, with linting plus unit and end-to-end tests as the guardrails, so the model extends existing patterns instead of inventing new ones.
• ♿ Accessibility is a default rather than a retrofit. WCAG 2.1 and ARIA from the start.
• 🌱 Currently going deeper on the Next.js App Router, React Server Components, and shipping LLM-backed features.
• 📫 Best reached by email: soreilly424@gmail.com
• 😄 Pronouns: He/Him/His
• ⚡ Fun fact: I've gone scuba diving in 7 different countries and counting.

Core: TypeScript, React, Next.js, Tailwind, React Query Data & APIs: REST/GraphQL, PostgreSQL, Supabase, Python/FastAPI Content: Sanity, Craft CMS, headless CMS workflows Testing: Jest, React Testing Library, Cypress Infra: Vercel, AWS, Digital Ocean, Git/GitHub Actions, CI/CD

VoyageAway — a wildlife discovery platform I designed and shipped solo. Next.js App Router and Supabase, with a relational model connecting species, destinations and community sightings, and the iNaturalist API integrated for live observation data alongside curated taxonomy, habitat and IUCN conservation status.

LIFO - a demo version of our LIFO startup.

Portfolio: https://sean-oreilly-portfolio.vercel.app/

LinkedIn: https://www.linkedin.com/in/sea-oreilly

Email: soreilly424@gmail.com