Berkay Özay

Frontend Developer at Meta Data Bilişim Teknoloji Sanayi Ticaret A.Ş.

Frontend developer working on the QNB Finansbank mobile application project as an outsourced developer; implemented features for multi-user types; focused on delivering a mobile-friendly, responsive UI; identified and resolved bugs and crash reports; collaborated with cross-functional teams to improve UX and performance.

Frontend Developer at Migros

Worked on a scalable, event-driven distributed system for Migros (Virtual Market, Yemek, Ekstra, and related platforms) with around 600 software engineers; built responsive web interfaces and contributed to architecture, performance, and maintainability across products.

Senior Frontend Developer (Freelancer) at Migros

Built Migros Yemek, Migros Mion, and Petimo platforms from the ground up; designed scalable frontend architecture and reusable UI component systems; led migration from Angular Material to a new design system; modernized the UI layer, improved performance, and mentored juniors; collaborated with UI/UX teams to ensure brand consistency.

Frontend Developer at Kavak

Frontend development for Kavak (Turkey) in Bursa; joined as one of the founding engineers and managed the entire frontend lifecycle from recruitment to project planning and delivery; designed an in-house scalable frontend architecture and contributed to multiple product lines within a unicorn-scale operation.

Senior Frontend Developer (Freelancer) at Migros (Migros Yemek, Mion, Petimo platforms)

Built Migros Yemek, Mion, and Petimo platforms from the ground up, designing scalable frontend architecture and reusable UI component systems. Architected and led the development of Paket Taxi Back Office, an internal tool, using modern frontend practices. Implemented advanced performance optimizations (lazy loading, code splitting, asset compression) to improve Lighthouse scores and user experience across web apps. Integrated DataDog for performance monitoring and real-time error tracking. Mentored junior developers, reviewed code, and optimized CI/CD workflows. Led migration from Angular Material to a new design system, modernizing the UI layer and reducing third-party dependency. Collaborated with the UI/UX team to design and develop Migros’ in-house design system for consistency and reusability across products.

Frontend Developer at Carvak Turkey

Built e-commerce and seller portal applications from scratch using Next.js and TypeScript, focusing on scalability, performance, and maintainable architecture. Developed a modular frontend architecture and reusable UI components, working closely with product and backend teams to ensure a cohesive user experience.

Frontend Developer at Istanbul-based Tech Company

Worked on a scalable, distributed system based on event-driven architecture with a large engineering team. Built responsive web and mobile experiences, performed daily maintenance, debugging, and feature work, and translated user requirements into scalable code. Participated in agile ceremonies with weekly stand-ups, tracked user stories and bugs, and led a migration toward a modern UI approach to improve reliability and delivery speed.

Frontend Developer at FinTech Company (Izmir)

Experience working for a financial technology company used by millions of people. Focused on delivering high-quality frontend experiences, improving performance, and implementing features to meet rapidly evolving customer needs.

Frontend Developer at Metadata Bilişim Teknoloji Sanayi ve Ticaret A.Ş.

Outsourced developer on the QNB Finansbank Mobile Application Project. Worked in Izmir with a tech stack including Kotlin/Android and supporting frontend work as needed, emphasizing reliable delivery and collaboration with a financial services client.

Senior Frontend Developer (Freelancer) at Visneport

Architected scalable frontend architecture and reusable UI components; led migration from Angular Material to a new design system; implemented performance optimizations to improve Lighthouse scores; integrated DataDog for real-time error tracking; mentored junior developers; collaborated with UI/UX to ensure brand consistency across products.

Front End Developer at Carvak

Built ecommerce and seller portal apps from scratch using Next.js and TypeScript; focused on scalability and performance; added new features for millions of users; maintained codebase; worked in an agile environment with weekly stand-ups and sprint planning.

Frontend Developer at Carvak

Worked on a scalable, distributed system with 600 software engineers; built ecommerce and seller portal apps from scratch using Next.js and TypeScript; maintained code, added features, and tracked user stories/bugs in GitLab; established coding standards and helped shape a design system across products.

Software Developer at Metadata Bilisim Teknoloji Sanayi ve Ticaret A.S.

Outsourced developer on a QNB Bank mobile application project; focused on delivering a high-quality user experience, customizing features for multiple user types, and debugging/investigating crash reports.

Frontend Developer at Metadata Bilisim Teknoloji Sanayi ve Ticaret A.S.

Worked for a fintech technology company used by millions; focused on creating a high-quality user experience and making the app easy to use; customized user features for multiple user types; identified and solved bugs and investigated crash reports.

Frontend Developer at Migros Digital Platforms

Built microservice-based e-commerce and seller portal front-ends from scratch using Next.js and TypeScript, focusing on scalability, performance, and maintainable architecture. Led frontend modernization and created reusable UI components.

Founding Frontend Engineer at Migros Turkey – Sanal Market (Digital Platforms)

Joined as a founding engineer, managed the entire frontend lifecycle from recruitment to project planning and delivery. Designed a layered, modular architecture with reusable UI components, led migration from Angular Material to a modern design system, and collaborated with UI/UX teams to ensure brand consistency and scalable UI across Migros' digital platforms (Sanal Market, Hemen, Yemek, Ekstra, Macro Center, Mion, Petimo, and Tazedirekt). Built Jira extensions with Atlassian Forge to automate tasks and improve issue tracking. Implemented performance optimizations, dataDog integration for monitoring, and mentored junior developers.

Senior Front End Developer (Freelancer) at Visneport

Built high-quality frontend for Visneport projects using Next.js, TypeScript, Tailwind CSS, and Shadcn/UI. Led design system usage, built scalable UI, and collaborated with cross-functional teams to deliver robust web apps. Maintained and added features for millions of users.

Frontend Developer at Carvak Turkey

Developed frontend for Carvak's online automobile marketplace. Worked with JavaScript, TypeScript, ReactJS, Angular, SASS, Docker, and AWS to deliver scalable web experiences for a unicorn operating in Latin America.