Highlights

I refused to ship a member-facing outcomes feature that used placeholder statistics. I held it dark instead, behind a hard, multi-part data-and-counsel threshold. (Medical Claim SaaS Platform)

I built the AI-facing payload as a whitelist-constructed object that holds only codes and IDs. Narrative text is structurally excluded before it can reach a prompt, not filtered out after the fact. (Medical Claim SaaS Platform, reasoning service's PHI firewall)

I found that a third-party SQL parser's traversal missed window specifications and DISTINCT ON clauses entirely, then added a second, unconditional sweep instead of trusting the library's documented API. (Payor Rate Data Platform, query-safety layer)

I root-caused a Terraform pipeline problem where an error-suppression flag combined with lost exit codes, letting failed plans report success and silently skip applies. Then I rebuilt the workflow to derive change counts straight from plan output. (Medical Claim SaaS Platform)

I named a failure mode specific to LLM-backed apps. Every backend layer correctly reflected a state change within seconds, but the model kept asserting the old state because it anchored on its own prior turns, invisible to every database-level guard and every test that only asserts on rows. (Payor Rate Data Platform)

I structurally retired a disk-exhaustion failure class by moving raw-volume staging out of the database into an on-task columnar pre-aggregation step, so database load scales with deduplicated volume instead of raw volume. (Payor Rate Data Platform, capture pipeline)

I commissioned an independent security review before any real protected health data entered the system. I kept the system restricted to synthetic data until its top-severity finding closed. (Medical Claim SaaS Platform)

I deliberately opened a locked-down service's public perimeter for roughly nine minutes to measure real traffic at the API level. I treated the clean result as proof the mechanism works, not as proof it's safe to leave open. (Payor Rate Data Platform)