Bruno R.

I write and fix the SQL behind business systems. Every day I support a SQL Server ERP used by 20-40 client companies: stored procedures, slow queries, data sync between branches and production issues. How I can help you: - Slow queries and reports: I find why they're slow and fix them without breaking what already works. - Stored procedures and T-SQL: new ones, fixes, or a clear explanation of what an old one actually does. - Data migrations and reconciliation: moving data between databases and proving the totals match. - Python automation: Excel/CSV processing, ETL, scraping and API integrations that remove hours of manual work. - Argentina e-invoicing (ARCA): I built a pipeline that imports fiscal printer data into SQL Server, reconciled to the cent against the daily Z report. My Upwork history: 20 jobs in data verification, web data collection and app/game testing, with several repeat clients (one contract ran for over a year). Different tools, same habit: checking data carefully at volume and reporting problems clearly. I also build and maintain my own apps: a gym booking app (React + Node + SQL) live since July 2026 with 300+ active members, and a FastAPI + PostgreSQL app with 288 automated tests. I use Claude Code every day, with rules in every repo (never touch production data, never expose credentials), and I review and test every change myself. Top Rated. Based in Buenos Aires (UTC-3), overlapping US Eastern hours. Native Spanish, working English. Send me the query, the error or the task, and I'll reply with a concrete plan.