Hi, I'm Rafael Rubenich.
I'm a senior full-stack engineer with 10+ years in TypeScript, React and Node.js, and lately a lot of Python and LLM agents. I build software that makes health care easier to deal with, for patients and for the staff on the other side of the screen.
Now: on a planned career break, going deeper into system design and AI agent engineering by building things in the open. I'm looking for my next hands-on Senior Software Engineer role.
Highlight
A virtual ER waiting room, cited by a health minister
CBC News · January 14, 2026
I led Luma's first Canadian go-live: an emergency-department queue at Sault Area Hospital in Ontario that lets non-urgent patients wait at home and get a text when it's time to come in. During the three-month pilot, overall wait times fell by more than 25% and the share of patients leaving without being seen nearly halved. New Brunswick's health minister, Dr. John Dornan, singled the project out as a model his province should look at.
Experience
Luma Health
US patient engagement platform used by 100M+ patients in the US, UK and Canada · San Francisco Bay Area · Remote
- Software Engineering Manager (hands-on)
- Senior Software Engineer
- Led Luma's first go-live in Canada: the ER Queue Manager at Sault Area Hospital, now the flagship Canadian reference.
- Migrated three high-traffic conversational agents to the new Agent Core platform with canary, per-account rollouts and CI voice tests.
- Architected the Luma Spark skills builder, where healthcare clients configure their own AI agents.
- Built a unified check-in platform (kiosk, QR code and URL) end to end in 4 days with AI-assisted development. The previous version took a team about two months.
- Took the real-time communication Hub from beta to GA, and cut a flagship page load from 4.4s to 0.6s.
- Took Insights Center, the patient-journey analytics product, from event model to public launch, and led the next-gen UI rollout across five product pods.
iFood
Brazil's largest food delivery platform · São Paulo · Remote
- Senior Software Engineer, Tech Lead
- Architected a CRM that gives 250,000 restaurant partners daily analytics about their business and customers.
- Built the front-end infrastructure behind 30 million targeted vouchers in a single year.
- Set up mentorship programs for junior and mid-level engineers.
Olist
One of Brazil's leading e-commerce ecosystems · Curitiba · Remote
- Senior Software Engineer
- Designed a micro-frontends architecture to let teams ship the Olist web platform independently.
TOTVS
Latin America's largest enterprise software company (joined via Wealth Systems) · Cascavel, Paraná
- Staff Engineer
- Senior Software Engineer
- Software Engineer
- Built a design system that cut development time by up to 90% on most application pages.
- Turned a 240,000-line JavaScript codebase into a modular framework that new products were built on.
- Shipped SPAs, Java microservices and offline-first React Native apps; mentored engineers through development plans.
Internships
Itaipu Binacional
The binational hydroelectric plant on the Brazil–Paraguay border · Foz do Iguaçu, Paraná
- Software Engineer Intern
- Developed and maintained internal administrative systems on IBM Lotus Notes and Java.
Itaipu Parquetec
Science and technology park at the Itaipu dam · Foz do Iguaçu, Paraná
- Software Researcher Intern
- Researched augmented reality for dam safety and tourism with Unioeste professors and the Center for Advanced Studies in Dam Safety (CEASB).
- Helped build SIGATI, a georeferenced information system for Itaipu tourism, with JavaScript, Wikitude, Ionic and AngularJS.
What I'm building
- platform-base: A multi-tenant foundation for AI products: auth, organizations and teams, an admin console, and an agents platform with streaming chat, background jobs and agent-to-agent delegation. NestJS · React 19 · Python · LangGraph
- genetic-dna: A small DNA language model trained from scratch, growing into an API and an MCP server over public genomics databases. Model on Hugging FacePython · Hugging Face · PyTorch
- blog: This site. Astro, deployed to Cloudflare Workers on every push. Astro · TypeScript · Cloudflare
Tools I reach for
Product
AI
Data & infra
Healthcare
Education
Universidade Estadual do Oeste do Paraná (Unioeste)
- B.Sc. in Computer Science
- Student representative for the Computer Science class of 2011.
- Member of the Computer Science Academic Center (CACC), 2012–2015.