Senior Full Stack Engineer · Buenos Aires, Argentina 🇦🇷

I build scalable products for fintech, cybersecurity and millions of users.

7+ years shipping software across fintech (MercadoPago, Pomelo) and cybersecurity (Strike). I architect scalable systems, payment infrastructure, automation pipelines and high-performance apps using TypeScript, Next.js, NestJS and Node.js. Track record leading critical projects, implementing observability, and shipping products used by thousands of users.

• 💼 Just wrapped up at Strike (cybersecurity · offensive security · pentesting)
• 📊 Previously Sr Developer at Pomelo Fintech and MercadoLibre / MercadoPago
• 🎯 Product Engineer mindset · backend, frontend, infra, automation, UI, performance
• 🔭 Currently building Guerras Políticas, Indicia, Barrial and automation tools
• 🌐 Portfolio: jveltri.com.ar

Global polo community platform. Filterable player directory (handicap, rank, country, club), unified services marketplace (horses, farriers, vets, saddlery), news feed, community chat, surveys with reward credits and admin payment workflows. Bilingual ES/EN.

Next.js 16 · React 19 · tRPC · Hono · Drizzle · PostgreSQL · Neon · Clerk · Ably · Cloudflare R2 · Turborepo · Sentry

🌐 polopage.net

Social-commerce platform for gated neighborhoods. Algorithmic feed, reviews, stories, announcements, QR visits, lost pets. iOS & Android coming soon.

Next.js · React Native · Expo · tRPC · Prisma · PostgreSQL · Hono · Clerk · Better-Auth · Turborepo · AWS S3 · Sentry · Resend

🌐 barrial.com.ar · 📢 socios.barrial.com.ar

Browser-based PvP strategy game (Tribal Wars-style) wrapped in Argentine political satire — "strategy is the skeleton, satire is the skin." Real-time combat resolution, a procedurally generated world map (Voronoi + PostGIS), queues/workers for battle resolution and crons, and dual card + crypto payments. Full monorepo: game + landing, realtime API, worker, admin panel, public wiki and a mobile bootstrap.

Next.js 16 · Fastify · tRPC · Socket.IO · BullMQ · Drizzle · PostgreSQL + PostGIS · Redis · Clerk · MercadoPago · NOWPayments · React Email · Resend · Expo · Railway · Neon · Turborepo

🌐 guerraspoliticas.com · 📖 wiki · 📱 iOS

Logic-deduction puzzle game (Murdoku-style) — instead of catching the murderer, you catch the jewel thief. 100% logic, no luck: unique-solution N×N grids, a technique-graded solver that scales difficulty, a level "path", and a daily case with streaks and shareable spoiler-free result cards. One Hono backend powers web and native, with server-authoritative leaderboards, native achievements (Game Center / Play Games) and cross-platform premium entitlements.

Next.js 16 · React 19 · Expo · React Native · Hono · Drizzle · PostgreSQL · RevenueCat · MercadoPago · Paddle · NOWPayments · Tailwind 4 · Turborepo · EAS

🌐 indiciagame.com · 📱 iOS

See who an Instagram account starts or stops following, over time. Snapshots a target's following list from your own browser session and diffs it — added vs. removed, matched by account id so renames don't lie. Ships three ways from one shared core: a Chrome MV3 side-panel extension, a zero-install bookmarklet / console script, and a two-file compare tool. Human-like anti-ban pacing, x-ig-www-claim bootstrap, 100% local — nothing leaves your browser. Open source.

TypeScript · Turborepo · WXT (MV3) · Next.js 16 · React 19 · Tailwind 4 · Zod · Vitest · esbuild · Vercel

🌐 igstalker.jveltri.com.ar · 💻 GitHub

Smart auto-enrollment for SIU Guaraní. Supports 28 universities and 148+ careers. Sub-minute cron blasts credentials in parallel with Promise.any, AES-256-GCM encryption, exponential backoff with CloudFlare/captcha detection, anti-rate-limit stagger jitter, persistent cookie jar for auto re-login, multi-user shared cache and audit-log observability.

Next.js · TypeScript · Drizzle · PostgreSQL · Neon · Clerk · Axios · Cheerio · Resend · Vercel Cron · AES-256-GCM

🌐 siu-bot.jveltri.com.ar

AI-powered application generator that creates complete mobile and web apps. Advanced prompt engineering for development, deployment automation and code generation.

React · Next.js · TypeScript · OpenAI API · Tailwind

🌐 appmaker.jveltri.com.ar · 💻 GitHub

Intentionally vulnerable web app for cybersecurity education and pentesting. SQL injection, XSS labs, interactive web security assessment.

Next.js · TypeScript · SQLite · Tailwind · Cybersecurity

🌐 vulns-expose.jveltri.com.ar · 💻 GitHub

All-in-one pet platform using AI to reunite lost pets with their families. Connects shelters with adopters, pet health management and community ecosystem.

Next.js · Drizzle ORM · Google Vertex AI · Clerk · Pusher · Tailwind

🌐 bepawly.app

Mobile app for tracking game scores across multiple players and game types. Score history, player stats, multi-format support.

React Native · Expo · TypeScript · iOS · Android

📱 iOS · 🤖 Android

Premium website for Argentine construction company with 30+ years of experience. Real estate in Vaca Muerta energy region with 3D renders, smooth animations, bilingual support.

Next.js · TypeScript · Tailwind · Framer Motion · GSAP · Three.js · next-intl

🌐 tmsconstrucciones.com.ar

Modern web app to explore The Simpsons universe. 1182+ characters, 768+ episodes, 477+ locations with advanced search, filters, favorites and statistics.

Next.js · TypeScript · Tailwind · TanStack Query · Framer Motion · shadcn/ui

🌐 simpsons.jveltri.com.ar · 💻 GitHub

I'm open to new opportunities — Product Engineer / Senior Full Stack Engineer roles, especially around fintech, cybersecurity, scalable systems and automation. Remote-first, based in Argentina.

• 📧 juanii.veltri@gmail.com
• 💼 linkedin.com/in/juan-ignacio-veltri
• 🌐 jveltri.com.ar