I build production-ready | scalable | secure web applications for startups | SMEs | enterprises — including SaaS platforms | B2B portals | CRM | ERP | dashboards | complex multi-tenant systems. Architecture: Clean Architecture | DDD | REST API | API-First | Modular | Microservices | RBAC | Multi-Tenant Backend: C# | .NET 8/9/10 | ASP.NET Core | Web API | MVC | EF Core | LINQ | SignalR | Identity | JWT | OAuth 2.0 | Swagger/OpenAPI Frontend: React | Angular | Vue.js | Blazor | TypeScript | JavaScript | HTML5 | CSS3 | Bootstrap | Tailwind | jQuery | AJAX | DataTables | Select2 Database: SQL Server | PostgreSQL | MySQL | EF Core | Migrations | Stored Procedures | Query & Index Optimization Libraries: AutoMapper | FluentValidation | MediatR | Serilog | Hangfire | Quartz | Polly | Refit | EPPlus | QuestPDF DevOps & Cloud: Docker | CI/CD | Azure | AWS | GCP | Deployment | Monitoring Version Control: Git | GitHub | GitLab | Bitbucket | Branching | Pull Requests Integrations: Payment Gateways | Email/SMS | AI APIs | REST/SOAP APIs | Webhooks | OAuth | E-Signature | PDF | Third-Party Systems Clean code | security | performance | scalability | maintainability | long-term support