# Jesiel Pfeifer — Fullstack Developer & Tech Lead

> Professional portfolio of Jesiel Viana Pfeifer (JesielPfeifer on GitHub).
> Fullstack developer and tech lead specialized in production systems, applied AI, integrations and self-hosted infrastructure.
> Main languages: English and Portuguese. Page: https://jesielpfeifer.com/ (EN: https://jesielpfeifer.com/en/)

## Profile
- Name: Jesiel Viana Pfeifer
- Role: Fullstack Developer and Tech Lead
- Summary: Builds and maintains production systems — from code to server. Expert in TypeScript, React, NestJS and applied AI, with self-hosted infrastructure.
- Education: Degree from UNINTER (Centro Universitário Internacional)
- Experience: SaquersTech; technical leadership of production systems

## Links
- GitHub: https://github.com/JesielPfeifer
- LinkedIn: https://www.linkedin.com/in/jesielpfeifer

## Stack & specialties
- Frontend: React, TypeScript, Tailwind CSS, Vite
- Backend: Node.js, NestJS, REST APIs
- Data: PostgreSQL, Prisma ORM, Redis
- Infrastructure: Docker, Nginx, Traefik, Cloudflare Tunnel, self-hosted
- AI: LLMs, autonomous agents, automated code review, AI usage dashboards
- SEO / GEO / AEO: visibility on traditional search engines and AI search
- Integrations: WhatsApp API, Stripe, document issuance, data protection (LGPD)

## Main projects
1. IAsConta — personal finance app with AI (open source). https://github.com/JesielPfeifer/IAsConta
2. Self-hosted homelab — personal infrastructure (Docker, Traefik, Cloudflare Tunnel, Pi-hole, Tailscale, Jellyfin, dashboards).
3. AI agents — autonomous development pipeline: issue creation, study, implementation and automated code review.
4. SEO/GEO/AEO — audits and optimization for search engines and AI (JSON-LD, llms.txt, citable content).

## FAQ (direct answers)
- Who is Jesiel Pfeifer? Fullstack developer and tech lead of production systems, specialized in TypeScript, React, Node.js, applied AI and self-hosted infrastructure.
- Which technologies does Jesiel master? TypeScript, React, NestJS, Prisma, PostgreSQL, Redis, Docker, Tailwind CSS, Python, WhatsApp API, Stripe, document issuance and AI agents.
- Does he have production system experience? Yes — builds and maintains complete production systems with authentication, payments, integrations and notifications at scale.
- How to hire? LinkedIn (linkedin.com/in/jesielpfeifer) or GitHub (github.com/JesielPfeifer).