— Full Stack Developer —Nº 0003Buenos Aires Edition
Juan/Giupponi
Full Stack Developer · TS · Node · LLMsSan Nicolás, AR · GMT-3● Available for work
— Leader / 00
I build production systems that don't fall over. Fiscal integrations, LLM agents, legacy migrations. I write TypeScript and Node as native languages, and use Claude Code with custom skills and subagents as a daily tool.
01
Work experience
From legacy ERP migrations to LLM agent orchestration in municipal systems.
W/01
Municipalidad de San Nicolás
Full Stack Semi Senior
- Node.js/TypeScript REST APIs for municipal revenue management with AFIP/RAFAM (SOAP/REST) integration and automated fiscal validation via cron jobs.
- Citizen assistant over WhatsApp: LangGraph deterministic flows for known intents, LLM for open-ended cases, Vision/OCR for documents; media on S3.
Oct 2024 —
TypeScriptNode.jsLangGraphPostgreSQLSOAP/REST
W/02
EDISAN Constructora
Full Stack — Freelance
- Commercial CRM with WhatsApp Business API and LLM agents (LangGraph) for inquiry classification and support flow automation.
Jun — Sep 2025
Node.jsTypeScriptReactDocker
W/03
Inmobiliaria RICCI
Full Stack — Freelance
- Real-estate CRM: LangGraph + WhatsApp Business API for lead classification and hand-off to human agents; media via S3/PostgreSQL.
Mar — Aug 2025
Node.jsTypeScriptPrismaReact
W/04
LeandroDapello — Microcom ERP
Full Stack
- Legacy ERP migration (Visual FoxPro → Express.js + SQL): business logic rewrite and architecture modernization.
Nov 2022 — Oct 2024
Express.jsSQLJavaScript
02
Selected projects
Index on the left, active case on the right. Click through.
Gov — San Nicolás · 2025 to 2026
Santia WhatsApp
Citizen-facing WhatsApp bot for San Nicolás municipality. Residents handle paperwork 24/7 without visiting an office, over the channel they already use daily.
- Stack
- TypeScript ·Node.js ·BuilderBot ·PostgreSQL ·Gupshup ·OpenAI ·Vision/OCR ·AWS S3 ·Puppeteer ·n8n
03
Technical stack
What I use in production — not what I tried once.
S/01LanguagesTypeScriptJavaScriptGoJava
S/02FrontendReact 18/19ViteTailwindshadcn/uiReact Flow
S/03BackendNode.jsExpressNestJSPrismaBullMQWebSocketsSocket.io
S/04DatabasesPostgreSQLMySQLRedisQdrant
S/05AILangGraphOpenAIGeminiOpenRouterReplicateVision/OCR
S/06IntegrationsMercado PagoWhatsApp BusinessMeta AdsAFIP/RAFAMStripeS3/MinIO
S/07DevOpsDockerCI/CDPlaywrightSSL/TLSZodJWT
S/08AI-assistedClaude CodeCustom SkillsSubagentsOpenCoden8n
04
Education
Formal and ongoing.
E/012025 —AI EngineeringUniversidad de PalermoACTIVE
E/022022 — 2024Programming Technical DegreeU.T.N.—
05
Writing
Notes on architecture, LLMs, and integrations. Ongoing.
R/012026-04-08From monolith to microservices: how to migrate without breaking everything12 min readREAD →R/022026-03-26Workers and queues: how we moved heavy processes out of the main app14 min readREAD →R/032026-03-06Integrating AI into development15 min readREAD →R/042026-04-28Santia: architecture of a citizen WhatsApp bot in production12 min readREAD →