Freelancer profile translated to English.
Back to original languageAbout Yang
CIO and Full-Stack Developer, Industrial Engineer (Master's UPC). I manage all the technology of a company: software and hardware infrastructure, ERP management, and custom tool creation. Specialized in CRM/ERP platforms and integrating real AI within them. Stack: Angular, TypeScript, Node.js/Express, and MySQL.
HIGHLIGHTED PROJECTS
▸ AI Intranet in production (self-hosted)
I designed and implemented an AI platform integrated with the ERP: ~30 AI "skills" in 9 business areas. Chat with agents that query the ERP and execute actions with safe limits; AI-generated reports with automatic sending (5 scheduled, +100 in history); confidence-level email responder; and document and email indexing with RAG (Retrieval-Augmented Generation). All on LLM models on my own server with NVIDIA GPU: data does not leave the cloud.
▸ Multi-tenant CRM/ERP Platform
Management system with +70 tables and isolation per organization. Advanced quoting tool (price/margin/cost), electronic invoicing (TicketBAI / Verifactu / FacturaE), and integration of offers, orders, delivery notes, and sales commissions.
▸ Hybrid IT Infrastructure
I manage my own server room (racks): on-premise domain + cloud in a hybrid architecture, and NVIDIA GPU server for local LLM. Automations with PDF/Excel, OCR, and desktop apps (Electron).
WHAT I CAN DO FOR YOU
• Integrate AI (LLM, chatbots, agents, RAG) into your apps or processes
• Self-hosted AI when data privacy is critical
• Custom full-stack platforms (CRM/ERP, dashboards, quoting tools)
• Electronic invoicing and process automation
• IT technical leadership and hybrid infrastructure (on-premise + cloud)
Remote. Native Chinese and Catalan, fluent Spanish, B2 English.
Chinese
Native or bilingual
English
Conversational
Spanish
Native or bilingual
Catalan
Native or bilingual
Remote only
Primarily works remotely
Experience
- EterEnergia S.LIT Consultant & Full-Stack DeveloperENERGY AND UTILITIESMarch 2024 - Today (2 years and 5 months)I developed a multi-tenant CRM platform for an energy (electricity and gas) trading company: backend, frontend, and AI integration.• Built a REST API (Node.js/Express, MySQL) with over 35 modules: contracts, quotes, price comparisons, commissions, payments, and real-time dashboard (SSE).• Implemented an AI OCR pipeline (Claude) that extracts data from PDF invoices and automatically feeds the CRM.• Developed the SPA frontend in Angular 20 (ag-Grid, Highcharts) with over 20 modules: contracts, quotes, comparisons, and statistics.• Created a desktop application (Electron) for batch processing of PDF invoices to Excel, used by the sales team.• Integrated energy market and regulator data (CNMC, ESIOS, MIBGAS) for price comparisons and electricity/gas tariff calculation.Stack: Node.js/Express, Angular, MySQL, Claude SDK, Electron, Python.
- Gestion Global Print S.L.IT Leader / Full-Stack DeveloperSOFTWARE PUBLISHINGJanuary 2025 - Today (1 year and 7 months)Barcelona, SpainI lead the architecture and development of a multi-tenant SaaS comprehensive management platform (ERP + CRM) for the printing and graphic arts sector, from start to finish: frontend, backend, and database.• Designed the multi-tenant architecture (Angular 21 + Node.js/Express, MySQL, +70 tables) with 3 applications: management, administration, and client portal.• Developed an automatic quoting engine with dynamic margin based on volume and imposition of layouts, validated with regression tests.• Integrated multi-regime electronic invoicing (TicketBAI, Verifactu, FacturaE) with workflows and webhooks.• Implemented a conversational AI assistant (Claude, OpenAI) that creates and modifies records with prior confirmation, plus content and FAQ generation.• Built the complete sales flow: quote → order → delivery note → invoice, commissions, SEPA direct debits, and CRM with integration to Microsoft Teams.Stack: Angular, TypeScript, Node.js/Express, MySQL, LLM integration.
- Zarca SLFull-Stack ERP ProgrammerTRANSPORTATIONFebruary 2024 - April 2025 (1 year and 2 months)Barcelona, SpainResponsible for the IT support area and active participation in the development of the new corporate ERP, built with Angular. My role combines technical incident support and resolution with continuous improvement of internal systems, supporting users and ensuring the proper functioning of the technological infrastructure.Furthermore, I am part of the development and evolution of the new ERP, collaborating in the creation of modules, interfaces, and functionalities aimed at optimizing company processes. This role has allowed me to combine the operational vision of technical support with direct participation in product development, providing solutions at both functional and technical levels.
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Education
- Master of EngineeringESEIAAT-UPC2022Master of Engineering - MEng, Ingeniería industrial
- Bachelor of EngineeringESEIAAT-UPC2020Bachelor of Engineering - BE, Ingeniería industrial