Self-taught backend developer. I build APIs with Node.js, Express, and raw SQL — no ORMs when I need control over transactions and query performance.

My focus is data integrity and clarity: manual ACID transactions, reserved stock logic to prevent overselling, and OpenAPI documentation that frontend teams consume without asking me questions.

I'm looking for my first professional team where I can contribute to production systems and learn from code review.

📧 dario.zerobyte@gmail.com | 🔗 LinkedIn | 📜 English C2 Certificate

A playable indie RPG built entirely in React and TypeScript, with no game engine and no canvas. Inspired by classic browser MMORPGs like Tibia and Argentum Online, it evolved from a technical experiment into a living world with interconnected maps, combat, crafting, and progression systems.

• Architecture: Custom collision system, independent entity patrol loops, multi-tile entities, and dynamic map loading — all driven by React state.
• Systems: Real-time combat with Damage-over-Time, loot tables, equipment durability, crafting, status effects (poison/bleed/burn), enemy AI, and a progressive Bestiary unlock system.
• Recognition: Independently discovered and featured on DEAD.ARMY, a curated catalog of indie browser games.
• 🎮 Live Demo · 📦 Repo

B2B invoicing and inventory API solving the problem of overselling in wholesale transactions. Manual ACID transactions, a full invoice lifecycle, and 30+ documented endpoints.

• Core logic: START TRANSACTION / COMMIT / ROLLBACK handling for invoice state transitions and a reserved-stock system that prevents race conditions.
• Security: JWT authentication with role-based access control (admin/client), IDOR protection, and Fail Fast validation middleware.
• 📦 Repo

REST API built specifically to demonstrate production-grade OpenAPI 3.0 documentation. The code is clean, but the documentation is the point.

• Developer experience: Full spec with success examples, detailed error responses (400, 404, 409, 500), and query parameter dropdowns.
• Reliability: Currying-based query builders for reusability, explicit foreign key validation before insert, and a /demo/reset sandbox for instant testing.
• 🚀 Live Swagger UI · 📦 Repo

Full-stack e-commerce platform built for a real client, covering the complete purchase flow from browsing to payment to delivery.

• Integrations: MercadoPago payments with webhook verification, PUDO logistics, Cloudinary media management, and an admin dashboard with JWT auth.
• 📦 Repo

• Languages: JavaScript (ES6+), TypeScript
• Backend: Node.js, Express, REST APIs, JWT
• Databases: PostgreSQL, MySQL — raw SQL, no ORM
• Docs & testing: OpenAPI / Swagger, Postman, Jest
• Tools: Docker, Git, Vercel, Render

Backend or full stack role on a team where code quality and documentation are priorities. I'm early in my career, I've shipped production-quality systems on my own, and I'm ready to learn from code review.

Open to remote or hybrid work from Buenos Aires, Argentina. C2 English.