Stephen Alexander
Essays · Interactive systems · Technical work

Operational AI. Network Architecture. Distributed systems.

I build them, harden them, and reason about where they run, what they can reach, and what they are allowed to do.

Every agentic system eventually confronts three architectural decisions: the function, the placement, and the authority. Service decomposition, topology, access control. Old questions, but they land differently now. Function is chosen at runtime. Placement can mean the edge, where connectivity is intermittent. Authority is exercised at machine speed, often faster than a human can manage it.

An Applied Reasoning Essay

The Inference Control Plane

Part One: the placement contract. Where inference runs determines what it can know, what it can do, and whether it can be trusted.

Download PDF ↓ How it fits the series →
The placement contract
One function, one judgment — three places it could run.
Execution environment
Edge device
Decision qualityholds
Contextholds
Permitted effectsholds
Degraded modeholds
Capacity & costholds
Provide enough without allowing too much
An Applied Reasoning Essay

From SBOM to Decision BOM

How inventories create false confidence in AI decisions. A complete record shows how a decision was made — not whether the evidence was enough to justify it. The companion to Evidence Debt.

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The proof is in the record?
A model recommends a credit-line cut. A human approves it.
Reviewer identityauthenticated
Signaturevalid
Policy in forcev2.3
No missing fields
Who actedproven
Was it allowed?never logged
device · location · network · policy ALLOW — the Zero‑Trust check, unrecorded
Ground truth: a properly authorized reviewer
Same record either way.
An Applied Reasoning Essay

Evidence Debt

“The system was designed to operate, not to prove what it did.” Evidence debt compounds quietly until someone asks a question the system was never built to answer.

Download PDF ↓ How it fits the series →
Evidence Debt
What a function must prove vs. what the system can produce.
Built · what shipped
Collect Synth Report Act
↕ The gap
Not built · what it can’t prove
Reasoningon what basis?
Accesswas it permitted?
Actionwas it authorized?
§ Work
Spoken & Published
AWS re:Invent · re:Inforce · Splunk .conf · AWS Public Sector Summit DC
Plus: AWS whitepapers on Election Security and Intrusion Analysis.
Career

AWS. Principal Technical Business Developer for Mission Networking.

Worldwide Technical Leader for the National Security, Defense and Public Safety technical feedback community at AWS.

Before that, Principal Security Solutions Architect, then led the Enterprise Support team for Defense and National Security.

Before AWS, enterprise IT and distributed computing architecture.

Signals intelligence, Marine Corps. Ran a network operations center in Hawaii.

MBA, Boston University · BS Information Technology, UMass Lowell · Various AWS and other certs · Mentors veterans into cloud security