ESBI-Mutabakat — Account Reconciliation SaaS

Problem

Account reconciliation was a slow, legally required process where accounting teams manually emailed hundreds of counterparties every month and tracked replies in Excel. Handing out the ERP database password was also a security risk.

Solution

I built a multi-tenant SaaS with ASP.NET Core 8 and Clean Architecture. Companies email balance/statement reconciliations to their counterparties, who approve or dispute via a tokenized page. ERP data is accessed through an allow-listed relay agent that never lets the database password leave the company.

Highlights

• LOGO and Bay.t support behind a single IErpDataSource abstraction
• Allow-list based relay (ESBI-Connect) security architecture
• One-click customer provisioning, role-based access, audit logging
• WYSIWYG mail template designer with Outlook-compatible HTML output
• Statement PDFs via QuestPDF, Excel via ClosedXML, bulk-send progress over SignalR
• Zero-touch deploys to IIS via a GitHub Actions self-hosted runner