John Meyer
I work in security engineering, mostly with Microsoft Security and Azure. This is where I share scripts, project notes, and AI experiments.
RAG Drift Monitor
Compare retrieval distances before and after changing a small document corpus.
Model Routing Middleware
Notes on a FastAPI router that selects a model and records fallback requests.
Code repair loop
Notes on running generated code, returning test failures, and limiting repair attempts.
Hybrid retrieval pipeline
Notes on combining keyword and vector candidates before reranking search results.
Investigate repeated sign-in failures
Group failed Entra sign-ins by user, with IP addresses, applications, and result codes.
Make a file integrity manifest
List relative paths, file sizes, and SHA-256 hashes for a directory.
Summarize retrieval drift
Recalculate query states from the distances in a saved retrieval report.
Review MFA registration events in Defender XDR
Find authentication-method events in CloudAppEvents and collect the account, IP, and audit details needed for review.
Keep Defender XDR custom detections in Git
A mail-volume query and a review process for changing custom detections without losing the query, settings, or rollback record.
Assign owners to Defender for Cloud findings
Use Resource Graph to join unhealthy assessments to resource owners and keep remediation and exceptions in a trackable backlog.
Check Intune configuration drift with Microsoft365DSC
A read-only Azure Pipeline pattern for testing a compiled DSC configuration and saving the results for review.