How do you know your authorization model is correct?
An adversarial testing pattern for relationship-based authorization models using real OpenFGA infrastructure and isolated stores.
📅 June 2026⚙️ .NET 10, OpenFGA v1.15.1, xUnit, Testcontainers
EST. 1986. 40 YEARS OF BUILDING WITH A COMMITMENT TO QUALITY AND CRAFTSMANSHIP.
O'Brien & Son
Craftsmanship doesn't change. The materials do. A workshop for building production systems to the same standard that earned forty years of trust in exterior remodeling.
In 1986, my mother founded O'Brien & Son to build quality into every project. For four decades, that meant windows, siding, gutters, shutters, and lasting craftsmanship. Today, I carry the name forward with different materials. This is where I design, build, and refine backend architecture, security patterns, and production systems.
Workshop Philosophy
Security as Architecture
Authentication, authorization, and data protection are design decisions, not afterthoughts. Built in from the foundation.
Backend-First Development
Business logic lives in services, not scattered across UI components. Complete APIs before frontend work begins.
Time for Quality
Every hour in design saves five in refactoring. Proper upfront work prevents architectural debt that cripples projects later.
Featured Work
View AllThe Uncertainty Principle Has a Sharpe Ratio: Quantum Portfolio Optimization in C++
Can quantum optimization be integrated into production financial infrastructure without rewriting the infrastructure itself?
📅 May 2026⚙️ C++17, Qiskit, IBM Quantum, Python 3.8+
Project ARES: A Demonstration in Backend-First Architecture
A production-ready, multi-tenant athlete management platform demonstrating backend-first architecture.
📅 January 2026⚙️ .NET 10, Azure SQL, Blazor WebAssembly
Active Workshop
This site is a hard hat area. New demonstrations, refinements to existing work, and additional architectural examples are added as they reach production quality.
The Same Standards. Different Materials.
O'Brien & Son built its reputation on quality that lasts. That commitment continues, now applied to software architecture, security-conscious design, and production systems.
Liam O'Brien — Senior Solutions Architect for Security
Backend-first architecture · Security as design · Systems built to last