I build things people actually use.

I'm Josue — a full-stack engineer who went from junior iOS engineer to Senior Software Engineer in three years. As the sole iOS engineer at a healthcare startup since day one, I owned the native app — now serving 16,000+ users. Then I kept going — picked up Rails, drove AI adoption across the org, shipped a BI platform nobody asked me to build, contributed to open source, and started doing independent AI consulting — building RAG systems and autonomous agents from scratch.

Always building, always learning.

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The story so far

2023

The Beginning

I joined CloseKnit Health as a junior iOS engineer with something to prove. From day one I was the only person working on iOS — the app is built on Hotwire Native with Rails powering the views, and I owned everything on the native side end-to-end. Eight months in, the app was live — a month ahead of deadline.

Sole engineer on a live healthcare app from day one. No playbook — just shipped it.

2024

Going Deeper

Led the development of chat on the mobile side and drove the web-mobile UX patterns to make it feel seamless across platforms. Led the deprecation of the original React Native app and the full transition to the Hotwire Native V2 — the platform I built from day one. Started learning Rails because I wanted to understand the full picture — not just my corner of it.

Always at the forefront of mobile — first to build, first to ship, setting the pattern for how features got done. That earned a promotion to mid-level.

2025

Full Stack, Full Send

iOS. Android. Rails. AI. I wanted all of it. Engineered a zero-footprint security architecture for HIPAA compliance — neutralizing data-leakage vulnerabilities in the mobile-web bridge — built features for the Athena EHR integration, and contributed to Hotwire Native open source with merged PRs. Then I turned to AI — formalized Copilot standards in the repo, gave a company-wide prompt engineering talk, and built an internal AI chatbot demo for the whole team. My manager rated me Above Target for driving AI adoption across the entire org. I didn't just use AI. I made the team better at it.

No stack off limits. No problem too unfamiliar. That's not a skill — it's a mindset.

2025

Building on the Side

While still at CloseKnit, I started doing independent AI consulting. Built a full RAG platform from scratch using PostgreSQL and pgvector for semantic search, engineered an 8-state conversational AI agent on GPT-4o, and developed a multi-provider vision pipeline that analyzes design intent to generate photorealistic room renderings. Real production systems, zero hand-holding.

The day job was never enough. It never has been.

2026

Senior Software Engineer

Three years after walking in as a junior, I was promoted to Senior Software Engineer at CloseKnit Health. Now authoring ADRs to standardize analytics, leading implementation strategy for complex Rails/EHR integrations, and still finding gaps nobody else filled — like championing and shipping Metabase to give non-technical stakeholders their first live window into app data.

Junior to Senior in three years. Still climbing.

When I close the laptop

I'm obsessed with growing — professionally and in every other direction. I train week in and week out for mountaineering trips because the discipline it takes to summit a mountain is the same discipline it takes to ship great software: show up, do the work, don't quit when it gets steep.

When I'm not moving, I'm deep in a technical book or down a rabbit hole learning something new. I don't do idle. The person I am at work is the same person on the mountain — relentless, curious, and always climbing. That's just how I'm wired.