Joao Paulo

Design, build and maintain a portfolio of production SaaS products used by real businesses. Own the full cycle: product design, frontend + backend, third-party API integrations, deployment and maintenance. Ship with a modern stack (Next.js, PostgreSQL, tRPC) and AI-assisted workflows to deliver quickly. Specialize in e-commerce automation: cart recovery, WhatsApp campaigns and marketplace-to-store sync.

Marketplace integration hub (in production) that syncs products, stock and orders between Mercado Livre, Amazon and Shopee and the merchant's online store — all from a single dashboard. Keeps catalog and inventory consistent across channels and centralizes order management, removing the manual work of running multiple marketplaces in parallel. Built as a multi-tenant web app with resilient third-party API integrations and background sync jobs on edge infrastructure. Stack: Node.js, Next.js, TypeScript, Cloudflare Workers, PostgreSQL and marketplace / e-commerce APIs, deployed on self-managed infrastructure.

SaaS that puts a company's blog on autopilot (app.botpost.com.br), for any business with a website — local services, professionals, e-commerce. The customer connects their WordPress site and BotPost plans and publishes SEO-oriented posts automatically: it generates topic ideas (editorial calendar), writes full articles with AI and publishes them on schedule directly to the connected site. Per-customer AI model selection tunes cost × quality per account, with global and per-company overrides from an admin control plane. Credit-based Stripe billing (each published post consumes credits) with pay-as-you-go top-ups, trial flow, connection-health monitoring, multi-tenant architecture, role-based access and support impersonation. Evolved from an earlier no-code automation (Google Sheets + Apps Script + Make.com) into a full web product. Stack: Next.js, TypeScript, tRPC, Drizzle, PostgreSQL (Neon), Auth.js, Stripe, WordPress REST API, LLM APIs, self-managed VPS.