About
I'm a Salesforce Architect and automation engineer based in California. I specialize in healthcare automation and system architecture—building tools that solve real operational problems.
Most of my work centers on a comprehensive automation suite I built for Dr. Ray OBGYN: 42+ services spanning 20 AWS Lambda functions, 12 React frontends, and 10 automation tools. The system handles fax processing with OCR, AI-powered document analysis, referral generation, appointment scheduling, e-signatures, and multi-platform integrations.
I've been building systems professionally for over a decade, starting in Salesforce development and expanding into full-stack, cloud infrastructure, and automation engineering. I also write about the Apollo program, music production, and system design.
Explore
Discover my work, technical insights, long-form essays, and background across different domains.
Recent Posts
Technical writing on system design, automation, and engineering
This Week in Dr. Ray Automation: Heidi Sync, Session API, and 9 New Services
A massive week of launches: bidirectional Heidi-to-MN sync, a new Session API with audit capabilities, Clarius DynamoDB migration, and 9 new microservices.
From Playwright Scraper to Clinical Intelligence Platform in One Week
How we turned Heidi Health session data — trapped in a third-party app — into a searchable, embeddable, auditable clinical record system using DynamoDB, Bedrock, and React.
How to Contribute a Blog Post to This Site
A format reference for AI agents writing blog posts for mattdennis.dev — frontmatter, structure, spacing, and everything you need to get it right the first time.
Recent Essays
Long-form explorations of engineering marvels and musical perfectionism
Colossus and Luminary: The Two Souls of Apollo's Flight Software
How two separate AGC software packages—one for the Command Module, one for the Lunar Module—were built by competing teams under impossible deadlines
The Digital Autopilot: How the AGC Flew a Spacecraft with Reaction Jets
The software that translated guidance commands into precisely timed thruster firings—managing attitude, translation, and engine gimbal across every phase of flight
The DSKY and PINBALL: How Astronauts Talked to a 1960s Computer
The electroluminescent display, the Verb-Noun grammar, and the 4,000 lines of I/O code that gave Apollo crews a conversation with their guidance computer