Full-Stack Developer & AI Engineer
About
Full-stack developer with 6+ years building SaaS products, end to end: multi-tenant architecture, backend (Node.js/NestJS, PHP/Laminas, .NET), frontend (React/React Native), PostgreSQL and infrastructure (Docker, Proxmox, Nginx, AWS). Remote experience with international clients, billing in foreign currency.
I built and operate a multi-tenant B2B SaaS in production (payment integrations, WhatsApp automation, invoice issuance), plus a local LLM inference stack compiled and optimized for my own hardware — I like to tinker with my RTX 5090.
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How I work
Verification as discipline
I don't accept answers by authority — not from docs, not from AI. I measure, report and fix.
Full context
I describe and demonstrate the data, and when needed we decide together
Scope → test → minimal fix
Planning and execution: we don't have much time to waste, right?
Long term
Infrastructure built to last, not to impress.
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Skills
Scale 1–10 · 8+ = delivers with authority
Core stack
Backend & API
DevOps & Infra
AI & ML
Languages
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Experience
2025 — present
Spheria — Full-Stack Developer
Remote, Spain. Healthcare management software for nursing homes and day care centers (Ballesol HIS): built on OpenEMR, with custom modules for resident management, auxiliary tasks, transfers and readmissions. AI-powered internal documentation tool: reads Bitbucket PRs and YouTrack issues and generates plain-language summaries, translated into Spanish.
2025
Third-party client — Full-Stack Developer
.NET MVC + Vue 3 (Quasar PWA), SQL Server, Kafka, Redis, AWS. CI/CD with GitHub Actions + ArgoCD (GitOps) to Kubernetes (EKS).
2023 — 2024
Meisters / Digiu / Medikus — PHP Developer
Medical management system (OpenEMR): features and fixes in PHP/Laminas, Java Spring Boot, Angular and Vue.
2020 — 2023
SJP Info — PHP Developer
Freelance, then full-time: PHP/Node.js systems, 4 React Native apps on the Play Store, internal systems (time tracking, email backup, orders).
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Beyond the code
Strengths
- Breadth with depth — owns the application, the infrastructure and the AI layer, with real depth in each.
- Autonomy — own business, contractor agreement with an international client.
- Tolerance for technical friction — compiling llama.cpp for Blackwell, debugging video-generation kernels, running Proxmox: tasks most people outsource.
- Precise communication — translates complexity for non-technical clients without losing precision, in PT and EN.
- Coherence — open-source when aligned with sovereignty, vendor when aligned with deadlines.
Where I'm growing
- Team leadership — today a senior executor; people management is the next step.
- Model research — the stack is strong in model infrastructure, not model research.
- Public code showcase — repositories are being built (this site is the start).
In my own voice
The system, explained by the person who built it.
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Let's talk
Open to contractor agreements, software and AI projects, and remote partnerships.