Brianna Marshinew
About
Building the infrastructure layer for agentic software development
ATHEORY.AI is a love letter to software development as a craft, and to the joy of building. The goal is not to replace the craft, but to make AI-assisted work more rigorous, visible, reviewable, and creatively useful.
We're exploring the infrastructure needed for reliable AI-assisted software development: portable skills, durable project context, programmable memory, explicit constraints, distributed coordination, verification, and human-legible control.
Models can generate code. Software teams still need control. The work here is a practical attempt to build the missing system around coding agents: a project-native harness where capabilities, memory, interfaces, and boundaries can be inspected, extended, and governed.
The perspective comes from 30 years of building software across web agencies and enterprise SaaS, from small applications to platforms serving millions and moving billions of dollars, and from frontend design systems and frameworks to complex systems architecture. By day, I help lead AI platform development, transformation, and enablement across the business side of one of Silicon Valley's most recognisable names, as a deployed Staff Developer with Rare Days.
Contributors
ATHEORY.AI is my vision and architecture, but ideas get better in discussion, and work gets better in collaboration. This is an open workbench for developers, researchers, designers, and platform teams thinking seriously about agentic software development.
Most of what we're building is public and open source as infrastructure for agentic software development. The goal is to make the harness layer visible, inspectable, extensible, and useful to people working with the next generation of coding agents.