I'm a Junior Full Stack Developer with a strong frontend focus, building web applications with React, Next.js, TypeScript and Node.js.
I enjoy turning real-world problems into functional software, working across the stack — from database design and REST APIs to frontend architecture, authentication, payments and deployment.
My main project is UruFix, a multi-tenant SaaS platform that I designed and developed from a real operational need. It is currently in production and actively used by a company in Uruguay.
I also have experience working directly with external development teams in requirements gathering, functional QA/UAT, bug reporting, feature prioritization and validation.
Currently, I'm:
- 🚀 Building and improving SaaS products
- 🧠 Strengthening my software architecture and backend fundamentals
- 🤖 Exploring AI-assisted development, coding agents, MCP and agent skills
- 💼 Looking for a Junior Developer opportunity where I can grow while contributing to real products
📫 Contact: leandromartinez.dev@gmail.com
Frontend
React · Next.js · Vite · TypeScript · JavaScript · TailwindCSS
Backend
Node.js · Express · NestJS · REST APIs · JWT
Databases
PostgreSQL · MongoDB · MongoDB Atlas · MySQL
Payments & Testing
Mercado Pago · PayPal · Webhooks · Functional QA/UAT · k6
Cloud & Tools
Git · Docker · Vercel · Railway · Render · AWS · Supabase
AI & Developer Tooling
AI coding agents · OpenCode · Claude Code · GitHub Copilot · MCP · Agent Skills
Production SaaS · Independent Project · Client in production
UruFix is a multi-tenant SaaS platform for managing technical service businesses.
I originally identified the problem while working at a company that managed its technical service operations using spreadsheets. I proposed building a dedicated system and developed the initial version independently, later evolving it into a multi-tenant SaaS product.
- Multi-tenant architecture with tenant-level data isolation
- Authentication and role-based access control (RBAC)
- REST API with Node.js and Express
- MongoDB data layer with tenant isolation
- Recurring subscriptions and payment processing with Mercado Pago
- Secure webhook validation using HMAC
- Analytics and reporting
- Excel/PDF exports
- SMS and email notifications
- Load testing with k6
- Production monitoring with New Relic
- Deployment with Vercel and Railway
Tech stack
React · Vite · TypeScript · TanStack Query · Zustand · TailwindCSS · Node.js · Express · MongoDB Atlas · Redis · JWT · Mercado Pago · Resend · k6 · New Relic · Vercel · Railway
🔗 Live: https://urufix.com/
Full Stack · Personal Project · Open Source
A full-stack platform connecting users with service technicians through location-based search, bookings, ratings and profiles.
- Full-stack application using a monorepo architecture
- Technician dashboards and profiles
- Authentication with JWT and Google OAuth
- Memberships and subscription flows
- Geolocation-based features
- Booking and rating functionality
- Mercado Pago integration
Tech stack
React · Vite · TypeScript · TailwindCSS · NestJS · TypeORM · PostgreSQL · JWT · Google OAuth · Mercado Pago · Cloudinary
🔗 Live: https://tutecnico-webapp-frontend.vercel.app/
Collaborative work simulations · Remote
Participated in collaborative software development projects following SCRUM-inspired workflows and working with frontend, backend and design teams.
- Built frontend features with React and TypeScript
- Developed a real-time auction platform using STOMP
- Contributed to a HealthTech project with React and Express
- Integrated REST APIs and authentication flows
- Collaborated through GitHub Issues, Slack and Trello
- Worked with feature-based development and team workflows
Tech stack
React · TypeScript · Node.js · Express · STOMP · Zustand · Zod · Git · GitHub
My portfolio includes additional projects, technical experiments and information about my experience.
🔗 https://www.leandromartinez.com.uy/
I'm looking for my first professional role as a Junior Developer, where I can work alongside experienced developers, receive feedback, strengthen my engineering fundamentals and contribute to real products.
I'm especially interested in frontend and full-stack development, SaaS products and teams that value continuous learning and good engineering practices.