MARCTOPLU

Designed and implemented a high-performance backend architecture in C# (ASP.NET Core 8 Web API) utilizing OOP principles and PostgreSQL with Entity Framework Core 8. Built an asynchronous JobWorkerService with the Task Parallel Library (TPL) for background queue processing, virtual credit handling, and Docker containerization. Architected an end-to-end multi-platform cataloging ecosystem that transforms barcode scanning and bulk ISBN Excel lists into enriched MARC 21 (.mrc) records, featuring secure JWT authentication with Firebase, an IPC bridge to a Python synthesis engine, a Flutter cross-platform mobile app, and a Next.js 16 web portal served via Caddy.