Yalçın Aktaş

Redesigned the FastyPay mobile app back end with +2 million users. I migrated a complex, monolithic SOA system into multiple microservices, improving performance, server cost, and availability. I also implemented CI/CD pipelines, automated unit tests, and code quality gates for the project. Finally, I developed a React management app for back-office users.

This startup was my first experience as an entrepreneur. The project aimed to develop a web application to help sell used cars. Instead of searching for vehicles, users post their requests or needs through the app, and dealerships present the most suitable offers. I developed the web application's front and back end using React, Spring, and Java with data collection capabilities from various car listing sites.

Led the team in redesigning a fraud infrastructure. We implemented new front-end applications with React while migrating monolith applications into smaller scalable microservices and a new messaging service with RabbitMQ that improved availability and response time.

This startup was my second experience as an entrepreneur. The project aimed to develop a web application to help sell driving courses online. I was the full-stack developer of the application building, working on both the user and seller sides using React and Spring. Beyond designing a scalable system, I also worked directly with customers, making polls and interviewing them to understand their needs and improve the app.

I created Java and Spring Boot APIs for fraud operations, ensuring they could handle heavy loads for our 22 million customers while being reliable and secure. I used various security testing tools, and we kept everything up to code with regular audits. Also, I developed several large-scale internal and customer-facing applications for the banks. While building two startups, I studied UI/UX (read several books such as Don't Make Me Think by Steve Krug). While building an app, UI/UX is a vital aspect, and I always try to take that into consideration.