Skilled ERP
ERP for payroll, employees, inventory and tools: a Flask JSON API with 216 endpoints and a React/Vite SPA, with real-time notifications over Socket.IO.
Puebla, Mexico
Juan Daniel Rivera Pérez
Backend Developer Systems Engineer
I build the systems a business runs on: APIs, ERPs, payroll and inventory, integration with biometric readers and hardware, and the Linux infrastructure it all runs on.
What I do
I work in modules: the whole system, or just the piece you need — the API, the database, the reader integration, the server.
01 BACKEND Systems and APIs Complete management systems and the APIs behind them: payroll, employees, inventory, point of sale and internal operations, on Spring Boot or FastAPI. DURATION 5 to 12 months View details 02 WEB Websites Corporate and presentation sites: fast, indexable and free of generic templates, with their domain, certificate and deployment. DURATION ≈ 1 month View details 03 IOT Hardware integration Biometric and card readers (Hikvision, ZKTeco, Suprema), Mercado Pago and BBVA payment terminals, NFC/RFID, serial communication, ESC/POS thermal printers and ESP32 boards. View details 06 NET Networks Network design and installation with Ubiquiti (UniFi) gear: switches, access points, VLANs, segmentation, cabling and link monitoring. View details
Projects
Systems in production: payroll, access control, point of sale and full platform migrations.
Biblioteca Maxipet
Corporate platform migrated from Flask to Spring Boot 3 (Java 17) keeping the database intact: document management, KPIs, complaints, corrective actions, safety alerts, questionnaires and audit log.
Ya lávame — Punto de venta
Touch point of sale in kiosk mode for a car wash, running in production: service charging, thermal-printer tickets, cash-drawer opening, end-of-day count, debtor tracking and management of prices and workers.