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Juan Rangel
About

I build things that have to keep working.

I am the CTO and co-inventor at Nemedic, a healthcare technology company. For most of the last decade I have been the only engineer on the stack — which means I designed the architecture, wrote the code, set up the infrastructure, and answered for it when something broke. The title came from doing the work, not the other way around.

I did not come to this through a degree. I left formal school early and learned by building, badly at first, then less badly. What I have instead of credentials is about ten years of production systems I have had to live with, and a fairly unsentimental view of which decisions actually matter.

My deepest expertise is Laravel, PHP, MySQL and AWS. Day to day now that also means Next.js, React, Tailwind, Docker, ECS and Fargate, Lambda, queues, and a lot of AI-assisted development. But I am wary of being described by a framework list. The useful thing is not that I know Laravel; it is that I can take a business problem that nobody has written down properly, work out what the system needs to be, build it, run it, and keep changing it while it stays up.

Healthcare is a good place to do that, because you cannot get away with much. Reliability, privacy and consent are not features you add at the end — they decide the data model. Working inside those constraints has made me a better engineer than any greenfield project would have.

Lately I have been spending as much time on the non-engineering half of the job: strategy, pricing, go-to-market, being an actual partner to my CEO rather than the person who builds what he asks for. I am also thinking hard about what stays valuable for engineers as coding agents get good. My current answer is architectural judgment, knowing how to orchestrate AI rather than just prompt it, and domain expertise you cannot look up.

I live in the Dallas–Fort Worth area. Outside of work I shoot photography — mostly wildlife and the moon, on a Sony mirrorless body — cook for my family, usually on a smoker, and play more PC games than I strictly have time for.

Juan Rangel

Dallas–Fort Worth, Texas


What I actually do

Architecture

  • System design
  • Data modelling
  • API contracts
  • Queue topology

Build

  • Laravel / PHP
  • Next.js / React
  • MySQL / Aurora
  • TypeScript

Operate

  • AWS
  • ECS / Fargate
  • Lambda / SQS
  • Observability

Domain

  • HIPAA
  • TCPA consent
  • 10DLC messaging
  • Clinical workflow