Staff software engineer — fintech risk & fraud. I spent five years at Chipper Cash (2020 → Oct 2025), senior → lead → staff, always at the intersection of engineering and risk & compliance: KYC/AML onboarding, identity and document verification, transaction monitoring.
Now building under HaruoDev:
- Tamperlens — a Document Trust API that answers one specific question: was this document edited after it was issued? A deterministic engine (no ML, no third-party calls) with 36 signal families across PDFs, images and Office documents, running in production. Its public stance is "risk signals, not verdicts", and its numbers are measured and published — including the unflattering ones. The free checker on the homepage runs without signup.
- tamperlens-mcp — MCP server for Tamperlens, on npm and the MCP Registry (source).
- n8n-nodes-tamperlens — n8n community node for Tamperlens, on npm (source).
Available for part-time / fractional work — 20 hours a week maximum, by choice, because I keep shipping my own products. Remote from Brazil (UTC-3), full overlap with US business hours.
More at haruo.dev.