$ AbonmanHesap

A public platform for calculating the financial efficiency of public transport passes.

→Built a calculation engine that determines how many trips are needed for a transport pass to break even, and compares the cost difference between using or not using a pass — based on the selected route, ticket type (student/full), and travel frequency.
→Developed and deployed the entire backend solo using Spring Boot. Designed secure and scalable REST APIs from scratch.
→Configured Nginx as a reverse proxy on the server side. IP-based request limiting at the Nginx level serves as the first line of defense against brute force attacks.
→Added application-layer rate limiting with Resilience4j. IP-based access restrictions protect the system against potential DDoS attacks.
→Monitored production issues in real time through log analysis. Identified and resolved problems by tracing log output.
→Managed the entire process solo — including server setup, deployment, security configuration, and continuous availability.

JavaSpring BootNginxResilience4jDevOps