What I can build for you
AI agents & MCP
LLM agents with tool use, MCP servers that give agents scoped access to your systems, and RAG that cites its sources instead of guessing.
Process automation
WhatsApp and SMS flows (WhatsApp Cloud API, Twilio), lead follow-up, reminders, reports and back-office jobs that run without anyone pushing buttons.
Integrations & legacy systems
ERPs, internal databases and third-party APIs connected through safe gateways, webhooks and idempotent pipelines.
Payments & identity
Payment APIs with mTLS, webhooks and refunds; authentication services with token rotation, rate limits and instant revocation.
Shipped in production
Recent work as the first engineer of a retail and distribution group.
Pix at the POS · Grupo JAC
In-house Pix (instant payments) at every checkout without touching the POS software: a pure C proxy DLL that intercepts only Pix and forwards card payments to the original payment-terminal library, backed by a payments microservice with mTLS, bank webhooks, and idempotent refunds. Validated with real money before rollout.
Knowledge Base for AI Agents · Grupo JAC
The company's official memory, consumed by agents over MCP: semantic search that always returns the literal record, provenance and expiry date for every fact, superseded versions instead of deletes, and an append-only audit trail.
AI Gateway for a Legacy ERP · Grupo JAC
Read-only access to an Oracle ERP for services and for Claude: AST-based SQL validation (single statement, SELECT only, WHERE required on large tables), enforced pagination, and one core serving both REST and MCP.
How we can work together
~20 h/week
Fractional
A senior engineer on your team part-time: ideal for shipping an AI or automation roadmap without a full hire.
~40 h/week
Full-time contractor
Embedded in your team, your tools and your rituals, with US Eastern business-hours overlap.
Defined deliverable
Fixed-scope project
A clear scope, a price and a deadline: an agent, an integration or an automation shipped to production.
Rates in USD, invoiced monthly. Email me with what you need and I will reply with a proposal.
Why work with me
Your time zone
Based in Brazil, 1–2 hours ahead of New York: real-time collaboration during your workday.
Senior ownership
As a first engineer I took a company from low-code to 12 production services in five months, from design to production.
A fraction of the cost
Senior output for significantly less than a US-based senior hire, with no recruiting or benefits overhead.
Simple contracts
Monthly invoices in USD from my company, or through your EOR (Deel, Remote). Fluent English (C1).
Tell me what you need to ship
A short email with the problem is enough. I usually reply within one business day.