Onur Y.

• Developed and optimized the backend application to meet evolving business needs.
• Enhanced the system architecture to support scalability and complex business requirements.
• Took a leading role in implementing software security and ensuring compliance with industry standards.
• Improved observability through advanced monitoring, alerting, and analytics tools.
• Provided support and upgrades for high availability and performance optimization.
• Expanded responsibilities by contributing to frontend development with React.js, working as a fullstack engineer to deliver end-to-end solutions.

• Developed and maintained the Java-based backend application to meet business requirements, excluding chat protocol functionality.
• Designed and implemented non-functional requirements:
• Centralized logging: Built a comprehensive logging system for better traceability.
• Observability: Integrated monitoring and alerting systems to maintain system health.
• Software security: Incorporated robust security measures to mitigate risk and maintain compliance.
• High availability: Developed fault-tolerant systems to ensure uptime and continuity.
• Contributed to the design and scalability of BLACKPIN’s backend architecture, focusing on security and system design.
• Collaborated with the client’s team to ensure seamless integration of new features and improvements.

• Led a full-stack development team consisting of ten developers.
• Took responsibility for all technical aspects of a software project, including design, development, deployment, and quality.
• Worked primarily on coding while also handling managerial tasks.
• Established the CI/CD process on top of GitLab.
• Developed a complete flight reservation system for a foreign tour operator, consisting of multiple modules including B2B (wholesale, retail) and B2C. Served as the lead developer, applying Microservices, DDD, and Hexagonal Architecture techniques.
• Built a digital logbook solution enabling aircraft technicians to manage their daily workloads in the field. Developed backend APIs for mobile clients from scratch using DDD techniques, along with a web-based admin panel using Thymeleaf and jQuery.

• Served as Technical Leader and Developer for the Ericsson Retail Management System (ERMS) project within the scope of Revenue Manager, a newly developed full-stack product for telecom companies.
• Delivered ERMS as a Stock Control Management System with additional Sales Organization and User Management functionalities.
• Led the DDD transformation, focusing on defining bounded contexts and refactoring them into independent OSGi bundles while applying DDD tactical patterns.

KKB is a financial institution responsible for Turkey's credit reporting, risk assessment, and consumer scoring services.

• Migrated legacy applications to cloud-native platforms using Spring Boot and supported DevOps transformation.

• Led internal migration from SVN to Git, including training, documentation, and case study.

• Designed Findeks.com, a consumer credit score portal for individuals and businesses.

• Initiated research into Cassandra and conducted POCs on scalable audit solutions.

AvivaSA (rebranded as AgeSA) is one of Turkey’s leading life insurance and pension companies and is part of a joint venture with Ageas and Sabancı Holding.

• Developed and architected the Bankasurans application, managing pre- and post-sale insurance workflows between Akbank and AvivaSA.

• Designed Haymer, a SOAP-based, multithreaded bulk data transfer tool.

• Led the use of design patterns, Java EE, and JSF 2.0 to modernize legacy applications.