About
Hello!! I am Marcello Ronald!
// Who am I?
Full-Stack & AI Software Engineer (UFG) focused on turning complex business problems into scalable web applications and production LLM workflows. With hands-on experience building multi-tenant AI platforms at CognX and public-sector systems for the State Government of Goiás (SEAD), I work end to end — from requirements and hexagonal back-end architecture (.NET, Python/FastAPI) to modern front ends (React, Next.js, Angular) and cloud deployment on GCP.
Software Engineering is the discipline of designing, building, and maintaining reliable, scalable systems — from data models, distributed messaging, and LLM orchestration pipelines to the interfaces real users touch. I work across the stack: C#/.NET and Python/FastAPI back ends in clean/hexagonal architecture, React, Next.js, and Angular front ends, and the architectural decisions (ADRs, TDD, CI/CD) that keep systems maintainable in production.
Beyond building production AI agents and RAG pipelines for clients, I use coding agents as active collaborators for research, code review, and rapid prototyping — with TDD, Testcontainers, and strict architecture boundaries as guardrails.
- Experience · ContractMay 2026 → Oct 2026 · Aparecida de Goiânia, GO (6 mos)
Full-Stack & AI Software Engineer · CognX
Engineered and evolved AI-driven products from concept to production at CognX, an AI orchestration startup. Key deliveries:- Lead developer of the company's multi-product AI agent platform in production at a large enterprise client: .NET 10 back end (hexagonal architecture, MongoDB) and Next.js 16 / React 19 monorepo on Google Cloud Run.
- Architected and built the recruiting and multi-tenant administration modules (users, groups, and per-company permissions via Clerk), integrated with WhatsApp, Langflow, and Senior HCM — authoring 7 of the module’s 8 Architecture Decision Records (ADRs).
- Built the API and dashboard for an AI recruiting SaaS MVP in ASP.NET Core with TDD (xUnit, Testcontainers), WhatsApp candidate screening with OpenAI audio transcription, and Asaas subscription billing (Pix, card, slip).
- Contributed to a client's production WhatsApp AI assistant (building the Chroma RAG document ingestion service) and overhauled their Node.js/Redis/PostgreSQL notification service — fixing a critical Meta token renewal failure, adding Slack alerts, and automating deploys with health checks and rollback.
- Experience · InternshipOct 2024 → May 2026 · On-site, Goiânia (1 yr 8 mos)
Software Developer · Goiás State Department of Administration (SEAD)
Part of the Systems Development Management department (GEDS), engineering and maintaining public-sector systems for the State Government of Goiás. Key deliveries:- Core front-end developer of Portal Reutilize, launched in June 2026: a statewide platform where public agencies list and reallocate idle assets without bureaucratic letters.
- Contributed from inception (requirements, user stories, and Figma prototypes) through the first 10 MVP sprints of Reutilize.
- Led the MVP of an internal web application for automated PDF comparison and data extraction.
- Built reusable components for the agency Design System and researched CI/CD automation, presenting a practical pipeline demo to the engineering team.
- Education2023 → 2028 (expected) · 7th semester (GPA 8.5/10)
B.S. in Software Engineering · Federal University of Goiás (UFG)
Studying Software Engineering at UFG, focusing on software architecture patterns, distributed event-driven microservices, automated testing, databases, and algorithm design.