Queues & Workers
Async, decoupled processing for heavy workloads.
BullMQVercel CronWorkers
Available for projects
Juan Ignacio Veltri
Product Engineer specialized in fintech, automation and scalable systems.
7+ years building software
Fintech & cybersecurity · MercadoPago · Pomelo · Strike
Millions of requests processed
Apps used by thousands of users
Buenos Aires, Argentina
About Me
Get to know me better
Senior Full Stack Engineer with extensive experience in fintech and payment platforms. Expert in architecting scalable applications using React, TypeScript and Node.js. Proven track record leading critical projects, implementing advanced monitoring solutions and optimizing developer experiences. Passionate about building robust, secure and high-performance applications.
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Location
Buenos Aires, Argentina
Experience
7+ Years
Technologies
50+ Tech Stack
Experience
My professional journey
Sr Software Engineer
Strike
Jan 2025 - Mar 2026
Led full-stack development initiatives at Strike, a cybersecurity company focused on offensive security and continuous pentesting. Architected robust platforms with strong security-first principles, integrating threat intelligence flows and high-performance services.
Software Development Sr
Pomelo Fintech
Feb 2024 - Dec 2024
Advanced to Senior Developer role, leading complex technical initiatives and mentoring junior developers. Specialized in ReactJS, NodeJS, Frontend/Backend development, Git, NextJS, NestJS and GraphQL. Delivered high-impact solutions for fintech platform development.
Software Development SSr
Pomelo Fintech
Feb 2022 - Jan 2024
Developed and maintained critical fintech applications using ReactJS, NodeJS, NextJS, NestJS and GraphQL. Focused on frontend and backend development, implementing scalable solutions and improving developer experience across the platform.
Software Development SSr Analyst
MercadoLibre - MercadoPago
Feb 2021 - Jan 2022
Led development of payment integration tools using React, NodeJS and MySQL. Implemented advanced monitoring solutions with Datadog, Kibana, New Relic, StatusPage and Tableau. Specialized in vulnerability assessment and functional programming practices.
IT Analyst
MercadoLibre - MercadoPago
Aug 2019 - Feb 2021
Developed payment service applications using React, NodeJS and MySQL. Contributed to frontend/backend development while implementing monitoring solutions and maintaining platform stability through comprehensive data analysis.
IT Assistant
MercadoLibre - MercadoPago
Oct 2018 - Jul 2019
Started career in software development, gaining foundational experience in React, NodeJS, MySQL and Git. Collaborated on platform monitoring using Datadog and Kibana, contributing to system stability and learning industry best practices.
BackOffice
MercadoLibre - MercadoPago
Apr 2018 - Oct 2018
Provided operational support and gained initial exposure to fintech operations, laying the foundation for transition into software development roles.
Customer Experience (CX)
MercadoLibre - MercadoPago
Oct 2017 - Apr 2018
Delivered exceptional customer service while gaining deep understanding of payment platforms and user experience requirements, providing valuable insights for future development work.
How I build systems
Engineering decisions that scale products
Caching
Multi-user shared cache, response dedup, response caching.
Redisin-memoryshared cache
Retries & Backoff
Exponential backoff + jitter and bot-block detection.
CloudFlare-awarelong backoffjitter
Observability
Audit logs, run metrics, error tracking and dashboards.
DatadogSentryOpenTelemetry
Rate Limiting
Stagger jitter, anti-burst, per-user quotas.
per-IPper-usertoken bucket
Cron Jobs
Sub-minute loops inside the Vercel function budget.
every-minute280s loopsVercel Cron
Encryption
Credentials at rest with AES-256-GCM, secret scoping.
AES-GCMKMSenv scoping
Infra & Deploy
Serverless functions, monorepos and OTA updates.
VercelAWSGCPTurborepo
Skills & Technologies
Technologies I work with
Programming Languages
TypeScript
JavaScript
Node.js
Bun
SQL
Python
Frontend
React
React Native
Next.js
Expo
Redux
Jotai
Zustand
TanStack Query
React Hook Form
Framer Motion
GSAP
Three.js
Tailwind CSS
shadcn/ui
HeroUI
Styled Components
Vite
Webpack
Metro Bundler
Frontend Testing
Backend
NestJS
Express.js
Hono
tRPC
REST APIs
GraphQL
Microservices
PostgreSQL
MySQL
Redis
Prisma
Drizzle ORM
BullMQ
Cheerio
Puppeteer
Resend
Clerk
Better-Auth
Webhooks (Svix)
AES-256-GCM
JWT
API Security
Tools & Others
Git
GitHub Actions
Docker
Turborepo
pnpm
AWS
Google Cloud
Vercel
Vercel Cron
Neon
Cloudflare
Sentry
Datadog
OpenTelemetry
Kibana
New Relic
StatusPage
Tableau
n8n Automation
Xcode
Android Studio
EAS Build
App Store Connect
Google Play Console
Jira
Performance Metrics
Projects
Some of my featured work
Polopage
Featured
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. Turborepo monorepo with Next.js 16 + React 19 + Hono/tRPC API, Drizzle + Neon Postgres, Clerk auth, Ably realtime pub/sub, Cloudflare R2 storage and Sentry observability.
Next.js 16React 19TypeScripttRPCHonoDrizzle ORMPostgreSQLNeonClerkAblyCloudflare R2AWS S3 SDKTurborepopnpmTailwind CSSshadcn/uiSentryPino
Barrial
Coming soon · iOS · Android
Social-commerce platform for gated neighborhoods. Connects residents with local businesses through an algorithmic feed, reviews, stories, announcements, QR visits and lost pets. Turborepo monorepo with Expo + Next.js, end-to-end type-safe tRPC, Prisma + Neon Postgres, Clerk + Better-Auth, AWS S3, Sentry and native + web push notifications. iOS & Android coming soon.
Next.jsReact NativeExpoTypeScripttRPCPrismaPostgreSQLHonoClerkBetter-AuthTurborepopnpmAWS S3SentryResendshadcn/uiHeroUI
SIU Bot
Featured
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.jsTypeScriptReactDrizzle ORMPostgreSQLNeonClerkAxiosCheerioResendGSAPTailwind CSSshadcn/uiVercel CronAES-256-GCM
All Things App
Featured
AI-powered application generator that creates complete mobile and web applications. Features advanced prompt engineering for app development, deployment automation and code generation.
ReactNext.jsTypeScriptAI/MLOpenAI APITailwind CSSApp Generation
VulnSite
Featured
Intentionally vulnerable web application designed for cybersecurity education and penetration testing. Features SQL injection, XSS vulnerabilities, and interactive laboratories for practicing web security assessment techniques.
Next.jsTypeScriptSQLiteTailwind CSSCybersecurityPenetration Testing
Puntify - Game Score Tracker
Featured
Mobile application for tracking scores and game results across multiple players and game types. Features intuitive score keeping, game history, player statistics, and support for various game formats.
React NativeExpoTypeScriptMobile DevelopmentiOSAndroid
Be Pawly
Featured
All-in-one platform for pets that uses AI to reunite lost pets with their families. Connects shelters with adopters, provides pet health management, and creates a community ecosystem for pet services.
Next.jsReactTypeScriptTailwind CSSDrizzle ORMGoogle Vertex AIClerkPusher
TMS Construcciones
Featured
Premium website for an Argentine construction company with over 30 years of experience. Showcases real estate developments in the Vaca Muerta energy region with 3D renders, smooth animations, and bilingual support.
Next.jsReactTypeScriptTailwind CSSFramer MotionGSAPThree.jsnext-intl
The Simpsons Explorer
Featured
Modern web application to explore The Simpsons universe. Browse 1182+ characters, 768+ episodes, and 477+ locations from Springfield with advanced search, filters, favorites, and statistics.
Next.jsReactTypeScriptTailwind CSSReact QueryFramer Motionshadcn/ui
