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Tomás Pérez
From Argentina 07:11 AM (GMT-03:00)
$15/hr or $27,500/yr

Active 12 hours ago


Member since Nov 2026

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Fullstack Engineer

Full-Stack Engineer
Available for hire
Years of experience
3+ years
Experience level
Mid-level
Available from
18 Nov 2026
Download Resume / CV

I'm a Full Stack Developer with 3+ years shipping production software with Node.js, NestJS, React, Next.js and TypeScript. I care about solving the real problem, not just the ticket: I like understanding what the business needs and owning the work from architecture to delivery. At Zurich Santander I build internal platforms for the insurance business, and a big part of my work today is AI-native development. I designed a human-in-the-loop AI harness that migrates legacy Oracle reports to Node.js and React. The agent orchestrates, deterministic scripts do the execution, and a person approves the critical decisions. Automated pixel-by-pixel regression checks every migrated report against the original, and we reached identical outputs and zero production errors on legal documents. I'm now leading a second harness that scans the company's repositories with Semgrep and Python, detects vulnerabilities, writes the fixes and opens pull requests on GitHub, with status reports for each family of repositories. Before that, I resolved 44 security vulnerabilities in 3 days (work originally scoped at 700+ hours), cut a PDF reporting API's response time by 50%, and I'm contributing to the migration of 500 Oracle Forms screens to React and Node.js with micro-frontends. Outside my main role, I co-developed DJ Presskit, a multi-tenant SaaS and official SoundCloud partner with 60+ active artists. I've also delivered freelance projects for retail, e-commerce and real estate clients, where working directly with the client was part of the job. I'm looking for a full-time remote role as a Full Stack or Backend developer on a product team, ideally building real products that use AI well: agentic workflows, tool calling, MCP and RAG.

Employment History

Backend Developer at Tienda Lo Quiero Acá 2026 - 2026
Contract role building backend APIs for a retailer's service ecosystem, on a large NestJS and TypeScript codebase with hexagonal architecture and Clean Architecture. Business logic in the domain layer, ports as contracts and interchangeable adapters for persistence and external services. Applied SOLID with dependency injection through interfaces, ORM-decoupled repositories and single-responsibility services. Implemented Redis caching on high-traffic endpoints to cut response times and database load.
Full Stack Developer (Backend-oriented) at Zurich Santander Current 2025 - Now
Internal platforms for the insurance business. Designed a human-in-the-loop AI harness that migrates legacy Oracle Reports to Node.js and React, with pixel-by-pixel regression testing: identical outputs and zero production errors on legal documents. Leading a company-wide AI harness that detects vulnerabilities with Semgrep and opens fix PRs on GitHub. Resolved 44 security vulnerabilities in 3 days (scoped at 700+ hours), cut a PDF API's response time by 50%, and contributing to the migration of 500 Oracle Forms screens to React with micro-frontends.
Full Stack Developer (Co-developer) at DJ Presskit Current 2025 - Now
Co-developed a multi-tenant SaaS that generates professional press kit websites for DJs and music producers. Official SoundCloud partner with 60+ active artists. Multi-tenant architecture with a shared database and Next.js middleware that resolves each subdomain and injects the tenant context. Real-time dashboard where artists manage their bio, events, releases, media and technical rider. Capsule design system with exclusive themes limited to 25 DJs per edition. SoundCloud API and YouTube integrations, Stripe payments, custom subdomains and domains. Stack: Next.js, NestJS, TypeScript, PostgreSQL, Prisma, Docker, Vercel.
Frontend Developer at iPhone BRC (via Real Labs) 2025 - 2025
High-conversion e-commerce landing page for an Apple products retailer in Bariloche, Argentina. The site reached 13,000+ views in its first 90 days. Responsive Next.js landing with an animated video hero, product showcases and WhatsApp CTAs. Scroll animations, infinite logo carousels and dynamic product cards with Cloudflare image optimization. SEO and mobile-first performance, delivered on agency deadlines with the design and branding teams.
Freelance Full Stack Developer at Self-employed 2023 - 2024
Freelance projects for clients in real estate, manufacturing and e-commerce, owning client communication, architecture, development and deployment. Property Scraper: scraper for Mercado Libre and Zonaprop with Puppeteer, a React admin panel and backend PDF reports. Spotsline: e-commerce for a metallurgical company with high-volume stock management and a local database replicated to SQL Server. Hydrotek Store: e-commerce with NestJS, TypeScript and Prisma, learned in under 2 weeks; reverse-engineered and integrated an undocumented billing system. Myfotolibro: photo book platform with image compression for professional printing and Cloudinary.

Education

Full Stack Web Developer (Bootcamp) at Henry 2022 - 2022