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Guillem Climent

Technical Founder & Systems Architect

I build the production infrastructure that runs a real, growing e-commerce business.

guillemclim@gmail.com github.com/AspiranteD linkedin.com/in/gcliment Spain · Working worldwide

Profile

Founder and sole technical architect of REUSALIA, a profitable and growing e-commerce company. I designed and built 100% of the platform — backend, automation and a custom ERP — that runs real inventory and real money. Pragmatic, production-first and self-taught: I founded the company at 25 and today I lead a five-person team while still writing the core code myself.

Key Impact

+50%
Revenue growth, year over year
40,000+
Product references managed
~100/day
Orders processed & automated
~40h/wk
Manual work eliminated

Experience

Founder & Technical Lead · REUSALIA
2023 — Present

Sole architect of the entire platform — I built the backend, all automation and a custom ERP single-handedly.

  • Backend & ERP: FastAPI/Python services and async pipelines on a PostgreSQL single source of truth, plus a custom Retool ERP for daily operations.
  • Marketplace & AI: automated 12 Wallapop accounts + eBay (reverse-engineered private APIs, resilient rate-limited extraction) and an LLM enrichment pipeline that removed ~40h/week of manual work.
  • Leadership & resilience: lead and train a 5-person team; rebuilt the whole operation after a catastrophic 2024 flood.

Earlier · 2020 – 2023

Senior Software Engineer · LittleBig ConnectionBackend services & REST APIs
Software Engineer · Sopra Steriaclient: Airbus — Java / Spring Boot, aerospace
Software Engineer · Capgeminiclient: Mercadona — Oracle SQL, retail at scale

Skills

★ AI
LLM pipelines (GPT-4o), agentic tool-use & RAG, embeddings/vector search, GPT-Vision, prompt engineering
Backend
Python, FastAPI, Java, Spring Boot, SQLModel, Celery, REST
Data
PostgreSQL, MySQL, Oracle SQL, NeonDB, SQLite
Frontend
Angular, Vue.js, Retool, JavaScript / TypeScript
Special
API reverse-engineering, web scraping, rate-limited / resilient extraction, data migration, hardware integration
DevOps
Docker, Jenkins, OpenShift, GitHub Actions, CI/CD

Selected Projects

Cloud-Local Command Bridge

PostgreSQL command-queue bridging a cloud core to local warehouse printers, with a distributed lock + failover.

github.com/AspiranteD/cloud-local-command-bridge
AI Product Enrichment

Production LLM pipeline classifying & enriching thousands of SKUs/day with GPT-4o + GPT-Vision.

github.com/AspiranteD/ai-product-enrichment
AI Ops Agent

Agentic assistant: LLM tool-use loop + RAG over the catalog, with an offline fallback.

github.com/AspiranteD/ai-ops-agent

Languages

Spanish — Native
English — Professional
French — Conversational
Portuguese — Conversational