Software and AI systems built to hold up.
Built with David Beltran.one principal from architecture through delivery.
Turns a repository into a live graph for impact analysis and agent context.
view →bc9 helps technical teams recover difficult builds, ship ai-enabled products, and design the infrastructure behind reliable agent workflows.
System Status
// systemctl --allSoftware you can inspect, install, and run
// ls ./open-systemsclient work is often private. these systems show the engineering in public: local-first infrastructure for code intelligence, agent coordination, evaluation, and institutional memory.
A live code graph for people and coding agents.
$ hayven impact <symbol> --depth 2view project →Benchmark AI agents on the code that actually matters—your own.
$ guignet mine && guignet gateview project →The local foreman for parallel coding agents.
$ sirius doctorview project →The Sothis ecosystem
// shared work, repository knowledge, documentationThe principal in the room
// whoamiDavid Beltran builds the work and stands behind it.
David is the principal engineer behind bc9 and the creator of Hayvenhurst, Guignet, Sirius Forester, Ametrite, and Catryna Wikinelli.
His work focuses on production software, local-first developer infrastructure, and the systems required to make AI-assisted engineering observable, testable, and accountable.
Clients work directly with him from architecture through delivery. Strategy does not disappear into a slide deck, and implementation is not handed to an anonymous bench.
How bc9 can help
// bring us the work that cannot stay fragilemodernization, process automation, and replacing rented SaaS are handled by our sister practice,Garnet Guidance →
Notes from the work
// tail -n 3 ./writing.logA Voice Agent Is Mostly Not the Model
What actually goes into shipping an AI voice and SMS platform for home services businesses, where the language model is one replaceable box inside a much larger system.
Grounded Answers Need Citations, Not Confidence
Building a question-answering system over the 2026 Florida Building Code, where every answer has to carry the exact section it came from, and where the GPU is an optional dependency in development.
A Database Per Tenant, and the Control Plane That Makes It Work
Why I keep reaching for database-per-tenant isolation on small B2B products, what it actually costs, and the piece nobody mentions until you are building it.
Bring us the build that needs senior attention.
tell david what is stuck, fragile, or ready to move from prototype to production.