Security researcher & founding engineer

Jeremyah Joel.

In my small personal lab, I research AI and security. As a founding engineer at VigilX, our side project, I turn that research into tools for investigating complex software.

I write about the decisions behind that work: what evidence a model missed, which assumption broke a system, and when changing the question led to a better design.

With the GovTech Edu team, I helped investigate a Google Cloud Armor flaw that led to a global patch. More recently, my research has found high-impact issues in heavily audited open-source systems.

Research & engineering

VigilX · Founding engineer

A plausible answer is only the beginning.

The hard part of my AI research has become deciding where the next model call will help: supplying missing evidence, retrying an interrupted investigation, or challenging a surviving claim. The article follows the system behind those decisions, where it still falls short, and why findings need human review.

The harness is the economics

SHADOW · Data engineering

Why repeat the work on every search?

SHADOW began with a narrower question: which two lookups did the system actually need? That decision shaped a design for 4.19 billion canonical credential records—records of exposed login details—on a 16 GB Mac Mini. One warm, single-threaded domain lookup took 0.38 seconds. The article follows the design, the mistakes it exposed, and the limits that remain.

Precompute, Don’t Search

Google Cloud Armor · Security investigation

A Google Cloud Armor firewall flaw, fixed worldwide.

Cloud Armor’s logs made blocked and allowed requests look identical. After months of investigation, our team at GovTech Edu produced a reproducible report. Google confirmed the issue affecting Classic Application Load Balancers and released a global patch.

Read the Cloud Armor investigation

My October 2026 research summary covers 15+ reported security findings over six months, including high-impact issues in heavily audited open-source codebases.

Other writing

Elsewhere.

Find my writing on Medium, projects on GitHub, or get in touch through LinkedIn.