Available to hire
Hi, I’m Johann Lee, a highly motivated full-stack engineer with 6 years of experience building scalable web and mobile solutions using React.js, Node.js, AWS, and Android Studio. I love turning complex requirements into robust, user-friendly software and delivering measurable impact for customers.
I value collaboration, continuous learning, and engineering excellence, and I’m excited to contribute to ambitious products and grow with a great team.
Skills
Language
English
Fluent
Work Experience
Software Engineer at JB Mobility
December 31, 2025 - October 6, 2025Optimized Android apps for leading auto brands (Hyundai, Genesis); developed and optimized apps with Kotlin/Java; delivered new features including an in-app charging system for EVs; integrated Google Analytics 4 for comprehensive insights; led GA4 integration enabling data-driven app improvements.
Full-Stack Software Engineer at Center Stage Hobby
December 31, 2024 - October 6, 2025Built a scalable sports card trading platform (React.js, Node.js, AWS). Developed data curation tools in React.js, improving ML accuracy to 89%. Delivered a robust back-end on AWS with Python/Node.js for a seamless user experience. Implemented unit tests with Docker for high code quality. Owned Android development (Java, Kotlin) delivering an app with 50,000+ downloads; led feature development and ongoing maintenance. Enhanced UX with deep-link profile sharing and integrated Stripe for in-app payments; implemented a seamless subscription model.
Front-End Software Engineer at VictorSoft Co. Ltd
January 1, 2019 - October 6, 2025Built user-centric web experiences; improved UI for Se-Jong Government Complex site; designed a custom, user-friendly site for JTO PFOOD Co. Ltd using Bootstrap; led UI/UX design for CSS Solar Co. Ltd's admin dashboard with real-time solar power insights.
Software Engineer at JB Mobility
January 1, 2025 - October 6, 2025Tech stacks include Android Studio (Java, Kotlin), React.js, Firebase, and Google Analytics. Optimized Android apps for leading automobile brands (Hyundai, Genesis). Implemented features such as an in-app charging system for EVs. Led GA4 integration for data-driven insights and improved app performance.
Full-Stack Software Engineer at Center Stage Hobby
January 1, 2024 - October 6, 2025Built a scalable sports card trading platform (React.js, Node.js, AWS). Created data-curation tooling in React.js to boost machine learning accuracy to 89%. Delivered a robust AWS-backed backend with Python/Node.js for a seamless user experience. Implemented unit tests with Docker and led Android development (Java/Kotlin) with 50,000+ downloads. Improved user experience with DeepLink-powered profiles and Stripe in-app payments; implemented a subscription model.
Front-End Software Engineer at Victoria Soft Co. Ltd
January 1, 2019 - October 6, 2025Built user-centric web experiences; improved UI for the Se-Jong Government Complex website. Designed a custom, user-friendly site for JTOFOOD Co. Ltd. Led UI/UX design for CSS Solar Co. Ltd's admin dashboard with real-time solar power insights.
Education
Bachelor of Science - Biotechnology at University of California, Davis
January 1, 2010 - January 1, 2014Bachelor of Science - Biotechnology at University of California, Davis
January 1, 2014 - January 1, 2014Digital Convergence (UI/UX Engineering, Front End) at Green Computer Academy - Gangnam
January 1, 2018 - January 1, 2018Immersive Software Engineering Program at Hack Reactor / Galvanize
January 1, 2020 - January 1, 2020Qualifications
Industry Experience
Software & Internet, Media & Entertainment, Professional Services
Skills
Hire a Full Stack Developer
We have the best full stack developer experts on Twine. Hire a full stack developer in Gardena today.