Senior .NET Backend Developer | C#, ASP.NET Core, APIs, EF Core & Azure
istanbul, Türkiye
#OpenToWorkSoftware architect and senior full-stack engineer focused on modernizing legacy . NET systems and building secure multi-tenant products. Recent work includes running WCF-era and . NET 8 services side by side during phased migrations, designing identity flows with OpenIddict, and building configurable onboarding platforms for financial services. Comfortable moving between architecture, backend delivery, Angular applications, data migration, and production troubleshooting in distributed teams. Available for fully remote full-time, contract, and freelance work.
I’m looking for a remote Senior .NET Backend Developer role, preferably long-term or contract-based. My core stack is C#, ASP.NET Core, Web APIs, EF Core, SQL/PostgreSQL and Azure, with Angular experience when full-stack work is needed. I’m particularly interested in API development, SaaS platforms, integrations, legacy modernization and scalable backend systems. Open to international remote teams and B2B contracts.
• Designed a Facade API that lets legacy WCF components and newer . NET 8 services operate together during controlled migration. • Built services with Minimal APIs, EF Core, DDD, Clean Architecture, PostgreSQL, Redis, OpenIddict, OAuth 2.0, SSO, scopes, and RBAC. • Extended Elsa Workflow with custom activities, connected n8n automation, and built an Angular operations dashboard for migration control and workflow visibility.
Siecom IT-Systemhaus GmbH
• Build configurable onboarding and back-office infrastructure for multi-tenant financial platforms. • Integrated Form.io and Elsa Workflow so teams can change forms, verification steps, and status flows without conventional frontend release cycles. • Designed shared- and dedicated-database tenant models, white-label domains, RBAC, audit logging, account locking, and password recovery.
FYNXT
• Maintained Upwork Top Rated Plus status with a 100% Job Success Score while delivering . NET and Angular systems for international clients. • Worked on legacy-to-microservices migration, API gateways, identity, workflow automation, caching, PostgreSQL, and automated testing.
Freelance and Upwork Contracts
• Built and maintained loyalty, gift-card, and customer-care software for chain-store operations. • Worked across ASP.NET MVC, APIs, SQL Server, SharePoint integration, smart-card workflows, and operational support.
RibbonId
• Developed passenger-service workflows covering reservations, agency bookings, transfers, driver assignments, flight tracking, reception, and lounge operations. • Implemented role-based access across reception, back-office, B2B portals, CRM, reporting, and accounting integrations. • Built transactional booking, cancellation, and agency-credit workflows with . NET, Angular, and SQL Server.
CIP IKIA
• Delivered backend services in C# and a microservices environment for a financial technology platform.
FinanzaPro
• Led full-stack development of aviation operations software for passenger logistics, terminal check-in, flight tracking, and accounting integration. • Delivered . NET services, SQL Server data workflows, and responsive operational dashboards used in time-sensitive airport environments.
Technology Idea
Udemy
Coursera
Coursera
