I design and build the systems businesses actually run on — ERP customisation, commerce platforms, integrations and data infrastructure — and carry them through to the web and mobile apps people use every day.
Based in Zaragoza. Working with clients in Spain, Mexico and the United States.
Six areas that come up again and again. Most projects combine three or four of them.
Custom Odoo modules, migrations off legacy in-house ERPs, and the sales, purchasing, helpdesk and reporting flows a business runs on. Delivered through a feature → dev → main release flow with client UAT before anything reaches production.
Strapi-backed APIs with Nuxt storefronts, and customisation of existing WooCommerce estates. Catalogue import tooling, variant and attribute logic, shipping rules by postal code, and payment gateway integration.
REST and GraphQL services, webhook pipelines, and the unglamorous connective work between systems that were never designed to talk to each other — payment providers, logistics, public data sources, legacy ERPs over XML-RPC.
Schema design, multi-tenant isolation enforced with row-level security at the database rather than in application code, migrations with reconciliation, and semantic search built on pgvector embeddings alongside your relational data.
Infrastructure as code across OCI, AWS and GCP: containerised deployments, per-tenant storage and key management, network and policy gates, and the boring reliability work that decides whether a system survives its second year.
Embedding pipelines, retrieval and classification wired into systems you already have — not a chatbot bolted onto the side. Including the harder question of what data is allowed near a model, and how to prove it never got there.
Client names are withheld. The technical detail is accurate.
Mexico
Replaced a legacy in-house ERP with Odoo 18, building roughly nineteen custom modules across helpdesk, sales, purchasing and market intelligence. Released through a gated branch flow with client acceptance testing at each block. Data migration ran under a strict no-exposure protocol: real records stayed quarantined outside the development environment and only synthetic fixtures were used in code.
In development
A document platform for board directors where the server never needs plaintext. End-to-end encrypted document vault, append-only hash-chained audit log, cryptographic resolution voting, and an opt-in searchable tier using vector embeddings. Tenant isolation is enforced by the database with row-level security, not by application logic.
Mexico
Strapi API and Nuxt storefront for a distributor, with catalogue import tooling, shipping-zone resolution by postal code across multiple carriers, and payment gateway integration. Included the migration and clean-up of an inherited product and pricing dataset.
Mexico
A standalone collector that pulls public trade and regulatory sources — news feeds, the US Federal Register, Census trade data, Banxico and FRED indicators — classifies and summarises them in Spanish with an LLM, and pushes the results into the client ERP over XML-RPC. Python standard library only, no dependencies.
The data model and the security boundaries get settled before anything is drawn. Most of the expensive problems in a project are decided in the first week, in the schema.
No feature without a failing test first. Small commits, gated releases, and acceptance testing with you before anything reaches production.
My background is backend. Assisted tooling is what lets me carry a project across the whole stack — architecture through to web and mobile front ends — but everything that ships has been read and understood.
I am a backend engineer working independently from Zaragoza, with clients across Spain, Mexico and the United States. Most of my work is with established businesses that have a system doing something important and need it extended, replaced or connected to something else.
That means I spend more time on data models, integration boundaries and deployment than on greenfield product design. When a project does need a front end — an admin panel, a storefront, a mobile app — assisted tooling lets me take it there myself rather than handing off half a system.
A short description of the system and the problem is enough to start. I reply to everything within two working days.
hola@raulceron.es