Remote — USA / EU / LatAm · Full-time · Contract · Freelance
Available Sep 2026 · GMT-3 (ART) · US/EU overlap
6 years of experience
Francisco Toyos
Senior Full Stack Engineer
React / Node.js · Mission-critical fintech & healthtech systems
Rosario, Argentina (GMT-3)
6+ years across banking, fintech, healthtech, and ERP · team leadership · AI-native workflow.
6+
Years exp.
5
Devs led
8+
Integrations
4
Industries
About me
Senior Full Stack Engineer specialized in scalable, user-centered web applications.
Senior Full Stack Engineer with 6+ years architecting mission-critical systems across banking, fintech, healthtech, and ERP. Track record leading teams (up to 5), shipping measurable gains (−62% page loads, −40% production bugs), and delivering platform initiatives ahead of scope. AI-native workflow with Cursor, GitHub Copilot, and Claude as a core part of development. Fluent English (C1) with international team experience. Available from Sep 2026.
6+ years in production. Led 5 frontend devs, cut production bugs by ~40% at Extendeal, optimized Santander performance (4s → 1.5s), and evolved an ERP across 2 markets. C1 English. Focus on CI/CD, TDD, and scalable architecture.
Education
B.S. in Systems Engineering
Universidad Abierta Interamericana (UAI)
In Progress
Undergraduate degree in information systems engineering.
Associate Degree in Software Development
Instituto Belgrano
2020 — 2023
Programming, software engineering, databases, algorithms, data structures, and software lifecycle management.
Full Stack Node.js
Digital House
2020
Final project Pick and Play: musical instruments e-commerce with React, Node.js, Express, MySQL, and Sequelize in a Scrum team.
React.js Course
Udemy
2020
Component architecture, hooks, state management, routing, and API integration.
Node.js Course
Udemy
2020
Backend with Express, REST APIs, middleware, routing, and database integration.
Featured work
Production case studies and prototypes with role, stack, and outcomes.
Case studies · Production
FeaturedPharma smart shopping SaaS
2023 — 2026Senior Frontend Developer · Team Lead
B2B platform connecting pharmacies with distributors. Purchasing workflows, supplier integrations, order management, and analytics in production.
Outcome: 5 devs · −40% bugs · 5→3 year roadmap · CI/CD on AWS
Internal banking platforms · Performance
Jul 2025 — Sep 2026Senior Frontend Engineer
React/Next.js apps for insurance, assistance, and banking systems at Santander Consumer. 600+ daily operations with a focus on performance and quality in a regulated environment.
Outcome: 600+ ops/day · −62% load time · React/Next.js · JWT/OAuth
Multi-country ERP for property management
Jul 2024 — Oct 2025Software Engineer
ERP platform evolution for ConsorcioAbierto (Argentina) and Properix (Colombia). Full stack, APIs, and admin/financial integrations.
Outcome: 2 markets · 15 months · per-market config, no fork
Prototypes
PrototypeStockFlow
2025 — PresentFull Stack Developer
Sales-tracking e-commerce: metrics dashboard, liters sold per product, and Gemini AI analysis on market trends, weak spots, and improvement actions.
Outcome: Backoffice deployed · storefront in development · Gemini AI insights
PrototypeHardware store comparator
2025 — PresentFull Stack Developer
Price and product comparison tool for the hardware store (corralones) sector. Prototype in development with direct client feedback to iterate features.
Outcome: Prototype · client feedback · continuous iteration
PrototypeHotel management system
2025 — PresentFull Stack Developer
Hotel management system: bookings, operations, and reports. Prototype in development with direct validation from hospitality clients.
Outcome: Prototype · client consultations · evolving
NetView
Full Stack Developer
Netflix-like streaming platform with separate frontend and backend. REST architecture and API consumption from React.
Outcome: Decoupled frontend and backend with independent deployment
Experience
6+ years across banking, ERP, healthcare/pharma, e-commerce, and freelance development.
- Current
- Full-time contract · Independent contractor
- Contract
- Freelance / Independent04
Full Stack Developer
Self-employed
Argentina
End-to-end web solutions for multiple clients: e-commerce platforms, corporate sites, and appointment-scheduling systems. Frontend, backend, ongoing maintenance, and performance tuning.
- Stack: Node.js, JavaScript, SQL/NoSQL databases
Impact
- Multiple clients with full stack end-to-end delivery
Node.jsJavaScriptReactSQL/NoSQL - Full-time
- Full-time
- Full-time
- Self-employed
- Freelance09
Full Stack Engineer
Workana / Freelancer
Argentina (Remote)
Early projects as an independent web developer, formalizing work via Workana and Freelancer with end-to-end delivery.
HTMLCSSJavaScriptREST APIsGit
Skills
Production stack — what I use to lead teams and ship product.
Frontend
Backend
DevOps & Cloud
Architecture & Security
Testing & Quality
AI & Automation
Usability & UX
Soft Skills
Languages
Communication in local and international teams.
Spanish
Native
English
C1 — Fluent · daily technical calls with international teams
Technical notes
Architecture and leadership learnings from production — banking, SaaS, and ERP.
From 4s to 1.5s on internal banking apps
What we measured and changed at Santander Consumer to cut load times ~62% on React/Next.js apps handling 600+ daily operations.
Recommendations
What colleagues I've worked with have to say.
“I worked with Francisco as Head of Engineering at Extendeal and as Project/Delivery Manager at Consorcio Abierto, and in both roles he stood out the same way: technical depth and genuine team leadership. As frontend lead at Extendeal, he showed uncommon architectural vision — scaling React/Next.js/TypeScript solutions without sacrificing maintainability, and delivering a platform initiative originally estimated at 5 years in just 3. His technical decision-making was always aligned with the business, not just what looks "correct" on paper. Beyond the technical side, he is someone you genuinely enjoy working with: he communicates clearly, mentors his team with patience, and takes real ownership of problems instead of waiting for someone else to solve them. I recommend him without hesitation for any senior engineering role.”
“I worked with Francisco at Santander Consumer, where I was his Tech Lead during his full-time role as Senior Frontend Engineer. He is a solid frontend developer: he delivered concrete performance improvements (cut platform load times by ~62%) and always maintained a careful architectural focus, thinking about scalability rather than just closing the day's ticket. He works well in Agile, contributes to technical grooming, and his code goes through review smoothly because it already follows good practices. Beyond the technical side, he is reliable and easy to have on the team — he collaborates well across product, design, and backend, and takes initiative when needed. I recommend him without hesitation.”
“Francisco is an excellent professional and a great teammate. He always shows commitment to objectives, contributing ideas and improvements. He has a strong focus on quality, promoting best practices and building sustainable, scalable solutions. Beyond his technical skills, I highlight his positive attitude, willingness to collaborate, and strong sense of ownership.”
“His frontend development skills, attention to detail, and focus on user experience make him stand out. A great professional!”
Let's work together
I'm open to new opportunities, collaborations, and interesting projects.
Typical response within 24 hours