Applied AI engineer in St. George, Utah. At Buzz Financial / ExpiTrans I build payment systems that never charge a card twice, and AI agents that only do what they are allowed to. Rust, Go, and Python.
Site: jadenmacielshapiro.dev
- Payment service rebuild (Rust): card sales, voids, and refunds moving off a legacy PHP gateway in seven stages, built so it can never charge a card twice.
- Internal AI agents (Rust, OpenAI Agents API): agents in production for risk review, account changes, and partner support, each limited to the tools it is allowed to use.
- MCP server for the gateway (PHP): lets agents in editors and internal assistants read and act on gateway data without seeing what they should not.
- Fulfillment and shipping (Go): multi-tenant carriers, live rates, labels, returns, and tracking behind merchant storefronts.
The code is private. The case studies are on the site and in the AI engineering portfolio.
- gauntlet: scores every changed function's risk and fails the build when risky code lands. Go, Python, Rust, TypeScript, PHP.
- symphony-rs: a Rust implementation of the OpenAI Symphony orchestration draft. Linear issues in, isolated workspaces and Codex sessions out.
- transcript: turns YouTube, TikTok, and Instagram links into text. Captions first, local Whisper when there are none.
- jstack: a skills pack for Cursor IDE and Cursor Cloud Agents.
- prompt-improver: an offline macOS app for tightening prompts without an API key.
- Purely: an iOS ingredient scanner for cosmetics. SwiftUI, barcode and label capture, on the App Store.
Open to applied AI roles and contract work. LinkedIn or the site.