Independent builder · Security + software
Building useful systems from the inside out.
I’m Harrison McCall. I build security tools and software platforms, from firmware research and operator workflows to products people use in the field.
01 / Selected work
Built, shipped,
put to use.
Ronuri
Construction marketplace connecting diaspora buyers with Liberian contractors and vendors.
ARK C2
Private command and control framework by Zypheron for authorized red-team operations.
Zypheron
AI-assisted security workflows for reconnaissance, assessment, and operator decisions.
02 / About
Curiosity with
follow-through.
I work across software and security, with a preference for systems that give people more visibility and control. That has taken me from firmware tooling to construction workflows and private research platforms.
My role changes with the project: product builder, engineer, or research collaborator. The standard stays practical—understand the problem, build the working system, and make its limits clear.
“Nothing is impossible to him who will try.”
Attributed to Alexander the Great
03 / Services
Where I can help.
Security engineering
Assessment workflows, threat modeling, hardening, and research tooling for authorized teams.
Product development
Responsive web platforms, complex workflows, and operational tools from first build to pilot.
Technical collaboration
Focused partnerships where the problem needs both engineering depth and a builder’s judgment.
04 / Contact
Have a hard problem
worth building?
Send a short note about the project, your timeline, and where you need help.
Harrison@zypheron.net