Hasan Y.

I’m a Senior .NET Backend Engineer with 11+ years of experience building scalable, secure, high-traffic backend systems for fintech, enterprise, and data-intensive products. I specialize in Clean Architecture, Domain-Driven Design (DDD), and microservices, focusing on systems that must be reliable under load, easy to evolve, and safe to operate in production. I don’t just “make it work” I design backend systems that teams can confidently run and extend for years. What I bring to your project • Backend-first thinking: clear domain models, predictable APIs, and maintainable codebases • Production mindset: logging, error handling, performance, observability, and failure scenarios are not afterthoughts • Scalability & integration experience: payment systems, external APIs, SAP-like enterprise integrations, message queues, and async workflows • Clean communication: clear technical decisions, documented trade-offs, and no unnecessary complexity Core Technical Skills • .NET / C# (.NET Core, .NET 6–9) • Clean Architecture & DDD • Microservices & Modular Monoliths • RESTful APIs & API Versioning • Message Queues (RabbitMQ, MassTransit) • Databases: PostgreSQL, SQL Server • Authentication & Authorization (JWT, role/permission-based systems) • Resilience Patterns: Circuit Breaker, Retry, Outbox/Inbox • Docker & CI/CD basics • High-traffic & mission-critical systems Typical Projects I Work On • Designing or refactoring enterprise backend architectures • Building secure, high-performance APIs • Breaking down legacy systems into clean, modular structures • Payment, order, inventory, or workflow-heavy systems • Improving code quality, performance, and maintainability in existing projects How I work I ask the right questions early, design with intent, and deliver incrementally. I care about why a system exists, not just how it’s implemented. If you want: • a backend that doesn’t collapse under real traffic • code that new developers can understand • architectural decisions you won’t regret in 6 months then we’ll work well together. Let’s build something solid.