Skip to content

Frontend engineer building production-grade web apps.

I design and ship interfaces that scale — accessible, fast, type-safe. Currently shipping four projects that show how I tackle real-world product problems end-to-end.

-> What I do

Focus Areas

Performance

Building interfaces that load fast and stay fast — optimizing bundles, images, and rendering paths to meet real user expectations.

Accessibility

Writing semantic HTML, maintaining keyboard navigation, and testing with screen readers so products work for everyone.

Real-time UX

Designing optimistic updates, live sync, and responsive interactions that make collaborative tools feel instant.

AI Integration

Connecting LLMs to product workflows — streaming responses, RAG pipelines, and patterns that keep users in control of the model.

-> Where I've worked

Industry Expertise

United States

Real Estate

-> Designing and developing scalable Microfrontend, enterprise-level platforms for managing real estate agent ecosystems, following strict Agile practices (Kanban/SCRUM).

United States

Pharmacy Benefit Management (PBM) and Reimbursement Systems

-> Designing and developing scalable platforms for PBM and reimbursement systems. Managing complex healthcare ecosystems using Agile/SCRUM methodologies.

El Salvador

Financial Services

-> Designing, developing, and deploying Digital Banking platforms for a new financial institution. Integration of diverse government and private payment gateways across multiple channels, defining technical architecture scope, and championing Agile/SCRUM methodologies for project implementation.

El Salvador

Insurance Technology

-> Managed the implementation of core banking and insurance platforms, focusing on achieving regulatory compliance (Compliance) and robust transactional security protocols. Expertise in end-to-end claims and claims lifecycle management.

-> Featured work

Projects

Live

Aurora Product Page

Premium product page focused on UI craft and performance.

ReactViteTypeScriptTailwind
  • Lighthouse 100s across all categories
  • Motion that respects prefers-reduced-motion
  • axe-clean — zero accessibility violations
Live

Habit Tracker

Offline-first habit tracker with a hand-rolled D3 heatmap.

Next.jsDexieD3
  • PWA with full offline support
  • Heatmap built with raw D3 — no chart libraries
  • IndexedDB sync with Dexie
In Progress

Mini Linear

Realtime Kanban with optimistic UI and full keyboard control.

Next.jsSupabasednd-kit
  • Realtime board sync via Supabase
  • Optimistic mutations with rollback
  • Command palette and full keyboard navigation

// links coming soon

Coming Soon

DocAI

Chat with your documents — bring your own Anthropic key.

Next.jsNestJSPostgres + pgvector
  • BYOK pattern — users supply their own API key
  • Streaming responses via Claude API
  • RAG pipeline with pgvector

// status: not yet shipped

-> Let's connect

Contact & Collaboration

Interested in working together or just want to chat about frontend architecture? I'm always open to new opportunities and interesting projects.

jcortesdev@gmail.com