Senior Full-Stack/API Engineer Needed

We’re looking for an experienced engineer to investigate, diagnose, and resolve reliability and scaling issues in our product catalog import system. The app is built on Base44 and processes product data from CSV files, APIs, and Google Sheets. The work includes reviewing the existing implementation, identifying root causes, delivering a reliable solution, and testing it with real catalog data. **Success means the import works reliably end to end.** We’re seeking someone who will solve the issues, not just provide a report or recommendations. Experience with large data imports, APIs, backend systems, and Base44 is preferred. Please share a relevant project and your approach to diagnosing and fixing production import systems.