Ahmet Özçelik

Java Developer

Istanbul, Türkiye

About

Java Backend Developer with 4 years of experience in banking and enterprise environments, building scalable backend services using Spring Boot microservices and distributed caching. Skilled in system modernization and designing high-availability architectures within Agile teams.

Experience

  • Java Developer at Şekerbank T.A.Ş.
    Aug 2024 - Jan 2026 · 1 yr 6 mos

    Modernized core banking modules by migrating legacy services from Java 6 to Spring Boot, improving maintainability and scalability. Developed and maintained backend functionalities for account lifecycle and investment-related services in digital banking. Contributed to mobile gateway integrations and cross-functional collaboration using Bitbucket workflows.

  • Junior Java Developer at Evatro
    May 2022 - Feb 2024 · 1 yr 10 mos

    Delivered Java backend solutions for the Eti–Eczacıbaşı and BSH (MIP) projects, improving backend workflows and optimizing SQL procedures for greater system stability and maintainability. Automated Excel-driven business rules through optimized SQL scripts, reducing manual processes, and supported mobile service integrations.

  • Junior Java Developer at SahaBT Yazılım
    Dec 2021 - Apr 2022 · 5 mos

    Built the Book Service for a group-based online book sales platform within a microservice architecture, implementing RESTful APIs and CRUD operations. Applied RabbitMQ for asynchronous messaging, Redis caching for performance optimization, and configured Eureka Service Discovery with API Gateway routing. Simulated horizontal scaling using multiple service instances and validated load balancing behavior during an intensive Java backend training program.

  • Intern at TCI Aircraft Interiors
    Nov 2020 - Dec 2020 · 2 mos

    Developed an employee reservation system for managing after-hours access to workplace social facilities, including swimming pools and fitness centers. Implemented backend functionalities for reservation management, availability tracking, and user-based access control, improving the efficiency of facility scheduling and reducing manual coordination.

  • Intern at THY Do&Co
    Jul 2017 - Aug 2017 · 2 mos