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Senior Full Stack Developer

Leobaldo Alcantara Neto

Building reliable systems with precision. From backend architecture to AI integrations, I deliver software that works at scale.

7+

years experience

20+

projects delivered

6+

AI integrations

About

Leobaldo Alcantara Neto

I'm a full stack developer with 7+ years of experience building systems that solve real business problems. My sweet spot is combining backend architecture, AI, and messaging platforms like WhatsApp to create products that actually get used. Most of my recent work involves NestJS, React, and integrating LLMs into production workflows.

Tech Stack

Backend

  • NestJS NestJS
  • Node.js Node.js
  • TypeScript TypeScript
  • Python Python
  • Prisma Prisma
  • PostgreSQL PostgreSQL

Frontend

  • React React
  • Next.js Next.js
  • Tailwind CSS Tailwind CSS
  • Astro Astro
  • Vite Vite
  • SH Shadcn/ui

Infra / DevOps

  • Docker Docker
  • AWS AWS
  • Google Cloud Google Cloud
  • Cloudflare Cloudflare
  • Traefik Traefik
  • Redis Redis

AI & Automation

  • VAPI VAPI
  • OpenAI OpenAI
  • MA Mastra
  • Gemini Gemini
  • Vercel AI SDK Vercel AI SDK
  • n8n n8n
Also work with: ElevenLabs Zod oRPC BullMQ Socket.io Express TanStack Query Nginx Hetzner Vultr DigitalOcean Fly.io GitHub Actions Docker Swarm Turborepo OAuth / JWT Clean Architecture DDD Repository Pattern Automated Testing

Projects

Zumma

2025-2026

Full-stack CRM platform with integrated WhatsApp messaging and AI agents for customer service teams.

NestJS Next.js React Tailwind Prisma OpenAI BullMQ PostgreSQL Mastra WhatsApp API Socket.io

5k+

conversations/mo

62%

AI resolution rate

7

companies using

AI Sales Recovery Platform

2024-2026

SaaS platform that automates sales recovery and customer engagement through AI-powered WhatsApp conversations with configurable assistants.

NestJS Next.js OpenAI BullMQ Socket.io WhatsApp API Redis

6%

recovery rate

50k+

messages/mo

9

job queues

Legal Case Intelligence

2025-2026

AI-powered pipeline that extracts, classifies, and analyzes data from legal case documents, turning unstructured files into queryable insights with a dashboard.

Gemini BullMQ Prisma React Express PostgreSQL

5k+

cases processed

80%+

extraction accuracy

20+

extraction fields

Voice AI Integration Platform

2024-2026

Suite of voice AI solutions combining Vapi, Twilio, and workflow automation for automated call handling, lead qualification, and business process orchestration.

VAPI Twilio Windmill OpenAI Express PostgreSQL

6k+

call minutes/mo

70%

qualification rate

5

clients in production

Cacau 500@

2023-2026

Complete digital infrastructure for Brazil's largest technical cacao farming movement — ticket e-commerce, conversion landing pages, WhatsApp automation, and post-event data analysis.

WordPress n8n React Tailwind Python WhatsApp API

30k+

producers reached

3

sold-out editions

249

NPS responses

Developer Portfolio

2026

This site — a bilingual, theme-aware portfolio built with Astro and deployed on Cloudflare Pages.

Astro React Tailwind Cloudflare

100

lighthouse

2

themes

2

languages

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