Marcelo Ceryno Plaza

AI Systems & Workflow Architect • Agentic Application Builder • Systems Analyst
EU Citizen (Italian Passport) • Remote (CET / EST Overlap) • marcelocplaza@gmail.com • linkedin.com/in/marceloplaza • Live Platform: app.mcpdigital.site

Professional Summary

Systems Analyst, AI Workflow Architect, and Agentic Application Builder. Background spans 18 years in technical account and infrastructure management in the financial sector (IBM, Sun Microsystems, HP) and 15+ years as an independent IT consultant and digital forensics expert for the Brazilian judicial system. Specializes in designing and shipping production web platforms, relational databases, and automation pipelines by orchestrating AI coding agents (Cursor, Claude Code) under Spec-Driven Development rules (SKILL.md playbooks, schema contracts, tsc --noEmit verification), alongside n8n, local LLM inference, and Next.js/Supabase architectures.

Technical Stack & Core Competencies

Agentic & Spec-Driven Dev: Spec-Driven AI Development (SPDD), Cursor, Claude Code, SKILL.md Playbooks, Context Governance
AI Systems & Orchestration: Multi-Agent Workflows (ReAct/Supervisor), MCP, RAG, Structured JSON, PromptOps, HITL, Gemini Live API
Local AI & Automation: n8n, Ollama, LM Studio, ComfyUI (Node Workflows & API), WordPress REST API, Webhooks
Architecture, Data & Ops: Next.js (App Router), TypeScript, Python, PostgreSQL, Supabase (Auth & RLS), PostGIS, Docker, Linux VPS

Professional Experience

AI Systems Architect, Agentic Builder & Judicial Forensic Expert | MCP Digital
2008–Present
Delivering judicial digital forensics, IT consulting, and production AI/SaaS systems via Spec-Driven Agentic Development.
  • Spec-Driven Application Building: Architected and shipped modular multi-tenant web applications (Next.js App Router, TypeScript, Tailwind CSS, Supabase PostgreSQL) by orchestrating AI coding agents governed via domain playbooks (SKILL.md), strict database truth contracts, Row-Level Security (RLS), and automated TypeScript verification.
  • Multi-Agent & Voice Architecture: Designed supervisor/specialist LLM workflows for legal and due-diligence document analysis (clause extraction, risk scoring) and real-time bidirectional voice agents with human-in-the-loop (HITL) escalation gates.
  • Local AI & Workflow Automation: Built automated content and data pipelines integrating n8n, local LLMs (Ollama, LM Studio) for prompt refinement, ComfyUI for local image generation, and automated publishing via the WordPress REST API.
  • Judicial Digital Forensics: Executed technical investigations, data analysis, and expert evidence reports for judicial proceedings in Brazil, enforcing strict audit trails and chain-of-custody compliance.
Enterprise Technical Account Manager & Solution Lead | IBM | Sun Microsystems | HP
1990–2008
Managed enterprise infrastructure delivery, systems integration, and technical operations for major financial institutions.
  • Systems Integration & Delivery: Coordinated pre-sales, engineering, and support teams to deploy high-availability server and storage architectures for national banking clients.
  • Technical Governance & Compliance: Aligned enterprise IT rollouts with financial sector security standards, regulatory compliance, and operational SLAs.
  • Partner & Vendor Management: Developed technical channel ecosystems, evaluated third-party solutions, and managed stakeholder alignment.

Applied Architecture & Live Proof-of-Work

MCP Digital Multi-App AI Platform & Geospatial Tooling | app.mcpdigital.site
Production Systems
  • Architected a modular multi-tenant SaaS environment hosting 20+ specialized AI micro-applications across 6 canonical relational database archetypes with role-based access control (RBAC), Supabase RLS isolation, and metered token usage ledgers.
  • Self-hosted and maintained the production stack on Linux VPS utilizing Docker containers, Coolify orchestration, Nginx reverse-proxy routing, and PostGIS spatial pipelines (WayLine).

Education & Certifications

IBM Data Science Professional Certificate — IBM
2023
Bachelor's Degree in Systems Analysis — PUCC Campinas

Languages

Portuguese: Native • English: Fluent • Spanish: Fluent