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merve birsin

@mervebirsin

Full Stack Software Engineer at Garanti BBVA Teknoloji who developed payment systems and merchant onboarding modules with Java 17 and Spring Boot.

Turkey

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At Garanti BBVA Teknoloji, I developed payment systems and merchant onboarding modules using Java 17 and Spring Boot, with gRPC communication between internal microservices. I also developed cross-selling interfaces with React, TypeScript, and Redux, and implemented authentication and authorization flows using Spring Security.

At Yapı Kredi Technology, I reverse-engineered undocumented .NET applications for migration to Java microservices and worked on financial applications and APIs. Earlier, at Garanti Technology, I developed automated tests for core banking payment systems including EFT, FAST, and SWIFT.

Experience

Work history, roles, and key accomplishments

Full Stack Software Engineer

Garanti BBVA Teknoloji

May 2025 - Oct 2025 (5 months)

Developed high-availability payment systems and merchant onboarding modules using Java 17 and Spring Boot, leveraging gRPC for low-latency communication. Implemented secure authentication with Spring Security and optimized GitLab CI/CD pipelines.

Java Spring Boot gRPC React TypeScript Redux Spring Security GitLab CI CD

Expert Software Engineer

Yapı Kredi Technology

Jun 2022 - May 2025 (2 years 11 months)

Executed a legacy migration project by reverse-engineering .NET applications into a modern Java-based microservices architecture. Engineered high-scale enterprise web applications using ReactJS and Redux, and optimized mission-critical APIs.

Java Microservices React Redux Spring Data JPA Hibernate RabbitMQ REST APIs

Software Engineer

Garanti Technology

Oct 2020 - May 2022 (1 year 7 months)

Developed comprehensive automated test suites using Selenium and WebDriverIO for core banking payment systems including EFT, FAST, and SWIFT protocols. Optimized CI/CD pipelines by integrating end-to-end automated tests.

Selenium WebdriverIO CI CD Testing Automation Banking Systems