Emir Karatekin

Employee management system rebuilt from a Java Swing desktop app into a Spring Boot REST API with a React dashboard — JWT auth, bcrypt password hashing, role-scoped access.

A random prize-draw tool rebuilt from a Java Swing app that could freeze on small entry lists. The new version validates the winner count server-side and reveals winners one at a time with a confetti animation.

A three-role hospital appointment system (chief physician, doctor, patient), rebuilt from a Java Swing app that stored passwords in plain text and built SQL with string concatenation. Now: bcrypt, JPA parameter binding, and role-based access control on every endpoint.

A vehicle service-tracking platform for a motorcycle workshop, built as one codebase with two experiences: a JWT-protected admin dashboard where staff log categorized maintenance — parts, inspections, photos — and a login-free customer portal where owners look up full service history by license plate, request appointments and browse vehicles for sale.

An AI-driven health and fitness ecosystem: a generative-AI diet and workout planner tuned to your biometrics and goals, plus a computer-vision food scanner that turns a camera photo into calories, macros and a 1–10 health score — with a BMI/BMR/TDEE dashboard, hydration tracking, a 175+ item grocery catalog, and full EN/TR/PL localization.