Fatih Kayacı

Backend developer building C# / ASP.NET Core REST APIs and event-driven microservices with Clean Architecture and CQRS.

Built

RestaurantBill, a POS and kitchen display system (.NET 9, SignalR, PostgreSQL, React 19) running as a live demo and load-tested with k6 at 100 concurrent users with 0% errors. Also built a four-service microservice backend with RabbitMQ, Redis and a YARP gateway. B.Sc. in Computer Engineering (2024), currently enrolled in an M.Sc. programme. Open to .NET / C# backend and full stack roles in Istanbul, remote or abroad (visa sponsorship needed).

Freelance Backend Developer (2026 – Present): E-commerce and corporate web projects with.NET 10, Clean Architecture, CQRS, PostgreSQL, Docker and Next.js. Developing an e-commerce platform end to end (.NET API, Next.js storefront and admin panel, iyzico payment, SMS and Bunny CDN integrations) and a corporate website for a construction company. Both in development.

Co-founder & Backend Developer – Cyftech / Katsis (2023 – Present): Building management web application (PHP, MySQL, Linux). Owned the backend end to end: REST API design, relational data model and multi-tenant structure; set up and administered the Linux server and deployments.

Software Developer Intern – IAS (Industrial Application Software), Istanbul (Oct – Nov 2023): Completed a structured training programme on the company's in-house platform and contributed to enterprise ERP modules; reviewed real customer requests and defect reports and took part in resolving them.

M.Sc. in Computer Engineering – Sivas Cumhuriyet University (Sep 2025 – Present)

B.Sc. in Computer Engineering – Sivas Cumhuriyet University (2018 – 2024). Final-year project: a real-time mobile messaging application built with React Native.

Languages: Turkish (native), English (B2 – professional working proficiency)