Looking for a job

João Batista Ferreira

@joobatistaferreira

Message

I build production AI-agent, RAG, and full-stack web platforms.

Brazil

Message

What I'm looking for

I'm looking to build production AI/LLM and RAG-powered web products, contributing across frontend and backend architecture while mentoring distributed teams and maintaining strong engineering standards.

I've spent 18+ years shipping product-driven web platforms used by millions, recently focusing on production AI/LLM products, RAG, and agentic systems.

At Dappier, I built and owned the frontend for an AI-agent platform, contributed to its Go API, hardened an embeddable AI-agent widget for third-party sites, and integrated OpenAI into product workflows. I also helped define API contracts for usage tracking and billing.

I've delivered LLM- and RAG-based applications for startups including Pump and Arancia, working across React, TypeScript, Node.js, Go, MongoDB, and AWS. At GoDaddy, I contributed generative-AI assistance to the merchant editing flow for a website builder and e-commerce platform used by millions.

I've led frontend development at Ender, mentored globally distributed teams, and set technical standards through architecture and code-quality reviews. My background spans React and frontend architecture as well as full-stack delivery with Node.js, Go, Java, and Ruby on Rails.

Experience

Work history, roles, and key accomplishments

Current

Freelance Full Stack Engineer / AI Consultant

Current

Self Employed

Sep 2025 - Present (1 year 1 month)

Design and build AI-powered web applications and LLM-based solutions for startups, from architecture through production. Shipped LLM- and RAG-backed features for clients including Pump and Arancia.

React TypeScript Go MongoDB AWS LLM RAG AI Agents Prompt Engineering Architecture Reviews

Full Stack Engineer (AI Platform)

Dappier

Aug 2024 - Sep 2025 (1 year 1 month)

Built and owned the frontend of a production AI-agent platform, letting users create, deploy, and monetize AI agents/RAG pipelines. Worked closely with founders in a fast-paced startup environment, shipping features end-to-end with React, TypeScript, and Node.js.

Software Engineer

GoDaddy

Apr 2024 - Aug 2024 (4 months)

Built frontend features for GoDaddy's website builder and e-commerce platform, used by millions of merchants worldwide. Delivered responsive, accessible (WCAG), and localized interfaces with React and TypeScript.