Business Informatics · Costa Rica
Hey there,I'm Alejandro Arias.
I build backend-heavy business systems that companies actually run day to day — ERPs, POS platforms and scheduling software. Two of the systems on this site were sold as freelance work and are live in production right now.
Focus
Backend
Building
ERPs & POS
Learning
Cloud
What I Do
Software built around how your business actually runs.
Not templates. Systems designed from your real workflow, with the data and audit trail to back it up.
Custom business systems
Businesses running a critical part of their operation on spreadsheets, paper, or an old system nobody maintains anymore.
- A system modeled around how your business actually operates, not a generic template with your logo on it.
- An audit trail on every operation that changes money or stock, so you can answer 'who did what, when' without guessing.
- Your existing historical data migrated in, validated, instead of starting from a blank database.
- Documentation someone else could pick up without having to ask me first.
Point of sale & e-commerce
Retail businesses that need in-store sales and an online storefront working off the same inventory.
- One inventory shared between the register and the online store, so stock never drifts between channels.
- Cash handling that matches how a physical register actually closes at the end of the day.
- Credit accounts for regular customers, tracked separately from cash sales.
- A public storefront with a real checkout, not just a product catalog.
Legacy system migration
Businesses stuck on an old system (DBF files, spreadsheets, a tool the original vendor stopped supporting) who are worried about losing years of history if they switch.
- A migration plan with staging and validation steps, not a raw data dump into a new schema.
- Reconciliation between the old and new numbers before your team ever stops using the old system.
- A clear, documented cutover, so there's a point where everyone knows the old system is retired for good.
Real Systems, Real Problems
Software I've built beyond classroom exercises.
The systems below run real operations — inventory that has to reconcile, appointments that can't double-book, cash drawers that have to close clean.
LICS — ERP for Laboratorio de Inyección Castro Solís
Offline-first ERP that replaced a legacy DBF system for a real fuel-injector lab. Live in production today.
Jewelry Management Platform — Cuero&Perla
Point of sale, inventory and public storefront for a real jewelry retailer. In production for 9+ months with active support.
EsteticaPro — Appointment Management Prototype
API-first scheduling platform for beauty salons, built to prove out a SaaS idea end to end. Prototype, not yet deployed to a paying customer.
Stack
What I build with.
The full breakdown, with versions, lives on each project's page.
Languages
Backend
Frontend
Databases
Cloud & Infrastructure
About Me
I like building software that actually gets used.
I build production-grade business systems: an offline-first ERP with 600+ automated tests for a real diesel and gasoline fuel-injector lab, and a POS and e-commerce platform live for a real jewelry retailer.
My work combines software engineering with business process thinking — I'm finishing a Bachelor's in Business Informatics at Universidad de Costa Rica (2027).
Have a system that needs building?
Tell me what you're running today and what's breaking. I'll tell you honestly whether I can help.