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Şahin User

@ahinuser

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I build backend systems and RESTful APIs with Java, Spring Boot, PostgreSQL, and Redis.

Turkey

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What I'm looking for

I'm looking for a software engineering role where I can build maintainable backend systems, work on APIs and database-driven applications, solve real problems, and continue learning.

I've built production-oriented backend systems with Java 21 and Spring Boot, including an e-commerce platform with JWT authentication, role-based authorization, payment workflows, Redis caching, Docker, and pessimistic locking.

During internships at EPSİLON ARGE Yazılım and CSF Yazılım Siber Güvenlik Teknolojileri, I contributed to backend development, RESTful APIs, database integration, debugging, and end-to-end issue analysis across frontend, backend, database, and cache layers in an enterprise ERP project.

I've also developed a Python-based stock analysis platform and a ROS2-based autonomous construction layout robot, and I led the web team as a founding member of Sınır Tanımayan Mühendisler.

Experience

Work history, roles, and key accomplishments

Software Development Intern

Epsilon Arge Yazılım

Jul 2025 - Aug 2025 (1 month)

Contributed to backend development using Java and Spring Boot, focusing on RESTful API development, CRUD operations, database integration, and layered architecture. Participated in Git-based workflows, code analysis, feature development, and debugging.

Java Spring Boot PostgreSQL Hibernate Git