I build web apps, mobile apps, AI agents, and MCP servers — and run them in production.
Founder @ R21 Digital · Arizona + Puerto Rico · US Citizen · Bilingual EN/ES
Open to Forward-Deployed, Applied-AI, and Solutions Engineering roles — remote.
- Agent infrastructure. A self-hosted fleet of autonomous agents, each on its own least-privilege identity, routed across Claude, GPT, Gemini, and Groq per task for cost and latency. Failed steps degrade instead of cascading.
- MCP servers. The tools that connect those agents to real systems — EHR data over FHIR, legislative records, game campaign state. Read-only by default, scoped by row-level security, audit-logged where the data is regulated.
- Mobile. A Flutter app on the App Store since December 2025, built for six targets off one codebase. When a store listing is the wrong answer, an installable PWA instead.
- Full-stack product. Next.js + Supabase + Vercel on the web, Make.com / n8n for automation, AWS where the compliance story requires it.
- AI-search visibility. Schema, llms.txt, citability, and crawler access tuned across production client sites, so the model answering a query can actually reach and cite them.
- Enterprise IT underneath. 15+ years, including HIPAA-regulated systems run under change control. It shapes how I design AI: for audit and real load, not for a demo.
| Project | What it is |
|---|---|
| practice-fusion-mcp | FHIR-first, read-only MCP server for the Practice Fusion EHR. Audit-logged and HIPAA-conscious — every tool call is scoped and recorded. TypeScript. |
| pr-legislative-x402 | Pay-per-call access to structured Puerto Rico legislative data over the x402 agent-payment standard. HTTP API + MCP server. TypeScript. |
| ftthelper-mcp | Connects Claude Desktop, Cursor, or Codex to Fantasy Tabletop Helper campaigns. Read-only, scoped by Postgres row-level security. Python. |
| hermes-agent_Video-Research-Ingest | Local-first pipeline turning videos and URLs into markdown notes, transcripts, metadata, and frames. Free-first by design — no paid transcription in the default path. Python. |
| ai-engineering-stack | The models, agent infra, RAG, voice, and app stack I actually build and ship with. Field notes, not a link dump. |
Client and product work I own end to end. The code isn't public, but the architecture is mine and I can walk anyone through it.
PRLTA angler platform — Flutter. On the App Store since December 2025, now at 2.5.8. Tournament standings, catch logging, and vessel records for Puerto Rico Light Tackle Anglers. 154 Dart files across 17 feature modules over a shared core: a dependency-injection container, 27 domain services, and a 12-widget component library. One codebase targets iOS, Android, web, macOS, Windows, and Linux; iOS is the one I ship. Crash reports carry a breadcrumb buffer, so a report arrives with the path that produced it, not just a stack trace. Account deletion is built in, because App Review requires it of anything with sign-in.
Fantasy Tabletop Helper — Next.js + Supabase. 1,128 TypeScript files with 390 test files, 116 migrations, three CI workflows. Installable as a PWA from a hand-written 81-line service worker instead of a plugin, because the caching rules are specific to campaign data. Its MCP server is public, above.
41 production sites on the books, 32 of them on Vercel, the rest mid-migration. Transactional mail on AWS SES. Uptime and platform drift come from a canary that measures the live response headers, so the registry can contradict me — and has. I learned most of what I know about designing for failure by being the one who gets paged.
Merged into Effect (#7154, #7166) and t3code (#7141, #6223), with #6228 open. Mostly Windows and WSL correctness — the paths that break when the maintainers are all on macOS.
Languages TypeScript · JavaScript · Python · Dart · SQL · PHP
Web Next.js · React · Tailwind · shadcn/ui
Mobile Flutter · PWA
Data & backend Supabase · PostgreSQL · Node.js · Laravel
Cloud & CI Vercel · AWS · GitHub Actions · GitLab CI
AI & automation Claude · OpenAI · MCP · Make.com · n8n
Website · LinkedIn · X · cjimenez@r21digital.com