Designed and built the backend architecture for Saytra, an enterprise field sales management platform, using ASP.NET Core 8 with Clean Architecture (Domain, Application, Infrastructure, API layers). Owned API design, database schema, and admin portal development for a system serving unit managers who create and assign journey plans to field salesmen, track visit execution, and monitor KPIs. Architected a 5-layer Clean Architecture solution (ASP.NET Core 8, EF Core, SQL Server) separating domain, application, infrastructure, API, and web concerns. Designed a delta-sync background service pulling from a legacy read-only source database into a new normalized schema, using timestamp-based change detection and per-table sync logging.