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Seungyong Oh
@dona_jason
Full Stack Web and Mobile App Developer, Korean Localization and Market Research
Corea del Sur
Coreano
Sobre mí
I’m a web developer and independent product builder based in South Korea. I build and maintain full-stack web applications using React, Next.js, TypeScript, APIs, and databases. I independently built and launched DoNa, a web and mobile date-course recommendation service, and developed QuoteCrate, a Shopify B2B quoting app. I also help international clients with Korean localization, supplier research, competitor research, local business research, and Korea market research. I focus on clear communication, practical solutions, reliable delivery, and organized results clients can use immediately.
Habilidades
Seungyong Oh
desconectado •
Revisa mis servicios
Adquisición y gestión de proveedores
I will find korean suppliers and manufacturers
Edición de contenido de IA
I will localize ai translated korean for apps and websites
Porfolio
Experiencia laboral
Shopify Web App Developer
Freelancer • Freelance
Aug 2026 - Present • 1 mo
Built QuoteCrate, a Shopify B2B quoting web app for wholesale merchants. Developed the full workflow from customer quote requests to merchant pricing, quote approval, and Shopify Checkout. Integrated Shopify APIs, billing, webhooks, authentication, PostgreSQL, email verification, and deployment using Remix, Railway, and Resend. Completed end-to-end testing with successful test orders and prepared the app for Shopify App Store review.
Founder and Full Stack Developer
Self-Employed / Freelancer • Tiempo completo
Oct 2025 - Present • 11 mos
Built, launched, and currently operate DoNa, a date-course recommendation web and mobile service in South Korea. Independently handled product planning, responsive frontend development, backend APIs, database integration, authentication, payments, location-based features, recommendation logic, admin tools, deployment, and ongoing maintenance. Released the service across web, iOS, and Android and continue improving it based on real usage and user needs.
Data Quality Assurance Freelancer
Quantum • Freelance
Jul 2024 - Jan 2025 • 6 mos
Reviewed and validated OCR-extracted text for AI training datasets. Identified extraction errors, checked data accuracy, and followed structured quality guidelines to ensure consistent and reliable results.
