Portrait of Theo Marsh
Shadow AI & Governance

Theo Marsh

Theo reports on the software employees build themselves and the risk it creates.

AI Tooling
Tauri vs. Tcl/Tk: Which Framework Should You Use for Internal Desktop Tools?
Theo Marsh · Sep 9, 2026 · 7 min read
Two contrasting modular hardware architectures side-by-side, one a compact core bridged to an external display pane, the other a dense monolithic block with integrated physical controls, representing Tauri and Tcl/Tk desktop frameworks.
Software Ownership
Self-Hosted AI vs Cloud AI: What the Triple Outage Proved
Theo Marsh · Sep 6, 2026 · 7 min read
Three sealed, disconnected spheres representing cloud AI services float above a single open modular framework with a connected local component, illustrating self-hosted AI's structural resilience compared to opaque cloud dependencies.
SaaS Economics
How to Reduce LLM API Costs in Development
Theo Marsh · Sep 6, 2026 · 7 min read
A sealed uniform intake box contrasted with a branching routing manifold that distributes tokens across differently sized processing chambers, illustrating tiered request routing for large language model calls.
AI Tooling
Claude Fable 5.1 vs OpenAI Astra: Which Should You Build On?
Theo Marsh · Sep 4, 2026 · 7 min read
A dual-slot hardware module where one bay contains a complex, active data cartridge representing an available API model, while the second bay is sealed by a featureless blank plate representing an unreleased product.
SaaS Economics
Verschlimmbesserung: Why SaaS Software Gets Worse Over Time
Theo Marsh · Sep 3, 2026 · 6 min read
A multi-layered topological model of a software stack, showing a simple foundation expanding vertically into a dense, over-engineered architecture representing feature bloat.
Shadow AI & Governance
How to Write an Internal AI-Generated Code Policy (Using Debian and Linux's Playbook)
Theo Marsh · Sep 2, 2026 · 6 min read
A mechanical sorting track routing open-lattice data plates into a primary queue while diverting an opaque sealed block, representing a policy framework classifying human and generated code.
Shadow AI & Governance
How to Review AI-Generated Code Before It Reaches Production
Theo Marsh · Sep 2, 2026 · 4 min read
A sequence of unlabelled rectangular plates passing through an automated structural scanning archway, representing a targeted code review pipeline and acceptance gate.
Shadow AI & Governance
Why Sandboxes Won't Save You From Shadow AI (And What Will)
Theo Marsh · Sep 1, 2026 · 7 min read
A structural diagram of a computational sandbox where rails radiating from a central hub pass through precise mechanical routing blocks, illustrating direct governance of agent actions over simple perimeter isolation.
Software Ownership
Hardware Lock-in: Why You Don't Own Software If You Don't Control the Device
Theo Marsh · Sep 1, 2026 · 5 min read
An isometric architectural model demonstrating a firmware pin-grid bridge selectively blocking standard software plates from seating into a hardware device base.
Software Ownership
The Sovereign Tech Fund: Why Owning Your Software Stack Is Now a Security Strategy
Theo Marsh · Aug 31, 2026 · 5 min read
An architectural model of a software stack and package dependency graph showing a strong structural foundation supporting higher layers.
Build vs Buy
Building Dashboards with AI: How Frontier Frontend Models Kill Niche SaaS
Theo Marsh · Aug 30, 2026 · 6 min read
An exploded-view mechanical diagram showing a single input token feeding into a processor that expands outward into a structured grid of physical dashboard panels.
AI Tooling
Building Internal Multimodal Tools: GPT-5.6 Sol vs Gemini 3.7 Flash for Developers
Theo Marsh · Aug 29, 2026 · 5 min read
A cross-section of an abstract hardware module routing blank data tokens into either a direct high-throughput chute or a denser, multi-stage processing chamber.
Build vs Buy
The Cloud Dev Stack Is Fragile: Why the GitHub Outage Broke Cursor Origin Too
Theo Marsh · Aug 28, 2026 · 5 min read
A stepped hardware stack where an upper computing module relies entirely on a single structural pillar rising from a foundational chassis, illustrating nested cloud infrastructure dependencies.
Shadow AI & Governance
The Shadow AI Tech Stack: 5 Tools Employees Are Using to Build Their Own Apps
Theo Marsh · Aug 28, 2026 · 6 min read
A cutaway view of a hardware enclosure where a stack of five local compute modules bypasses the primary routing interface via a dedicated, outward-facing structural conduit.
SaaS Economics
The Open-Source Pivot: Why Open Core SaaS Often Traps You in Enterprise Hell
Theo Marsh · Aug 27, 2026 · 5 min read
A spatial topological model of open-core software architecture showing an exposed inner network lattice enclosed by a heavy, opaque outer shell of proprietary enterprise modules.
Build vs Buy
The End of the Large Software Team
Theo Marsh · Aug 26, 2026 · 4 min read
An exploded hardware view of a centralized computing terminal routing a single input into a massive parallel array of automated AI agent processing bays.
Build vs Buy
Why Bloated Software Is Finally Becoming Unacceptable
Theo Marsh · Aug 26, 2026 · 5 min read
A side-by-side spatial comparison showing a massive, multi-layered porous framework next to a small, highly dense solid block, illustrating the memory footprint difference between high-overhead application runtimes and compiled native software.
Shadow AI & Governance
The 'Claudish' Code Base: Governing the Apps Your Employees Build
Theo Marsh · Aug 25, 2026 · 5 min read
A uniform open backplane standardizing and integrating a diverse array of irregularly shaped hardware modules.
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