Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

I'm a product-focused frontend developer with 4+ years of end-to-end development experience, delivering production-ready apps using React, Next.js, and TypeScript. I thrive in pivot-heavy startup environments, taking ownership from concept to launch and iterating quickly to ship value. I love learning from diverse environments and people, and I enjoy bridging technical and creative teams to craft intuitive UI/UX and robust interfaces. I stay curious, adaptable, and solutions-driven, ready to tackle new tools and challenges.…I'm a product-focused frontend developer with 4+ years of end-to-end development experience, delivering production-ready apps using React, Next.js, and TypeScript. I thrive in pivot-heavy startup environments, taking ownership from concept to launch and iterating quickly to ship value. I love learning from diverse environments and people, and I enjoy bridging technical and creative teams to craft intuitive UI/UX and robust interfaces. I stay curious, adaptable, and solutions-driven, ready to tackle new tools and challenges.

Jaeho Chang

Front-End Developer, Web Developer, UI Designer, +2





I'm a product-focused frontend developer with 4+ years of end-to-end development experience, delivering production-ready apps using React, Next.js, and TypeScript. I thrive in pivot-heavy startup environments, taking ownership from concept to launch and iterating quickly to ship value. I love learning from diverse environments and people, and I enjoy bridging technical and creative teams to craft intuitive UI/UX and robust interfaces. I stay curious, adaptable, and solutions-driven, ready to tackle new tools and challenges.…I'm a product-focused frontend developer with 4+ years of end-to-end development experience, delivering production-ready apps using React, Next.js, and TypeScript. I thrive in pivot-heavy startup environments, taking ownership from concept to launch and iterating quickly to ship value. I love learning from diverse environments and people, and I enjoy bridging technical and creative teams to craft intuitive UI/UX and robust interfaces. I stay curious, adaptable, and solutions-driven, ready to tackle new tools and challenges.

Available to hire

I’m a product-focused frontend developer with 4+ years of end-to-end development experience, delivering production-ready apps using React, Next.js, and TypeScript. I thrive in pivot-heavy startup environments, taking ownership from concept to launch and iterating quickly to ship value.

I love learning from diverse environments and people, and I enjoy bridging technical and creative teams to craft intuitive UI/UX and robust interfaces. I stay curious, adaptable, and solutions-driven, ready to tackle new tools and challenges.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

Korean

Fluent

English

Advanced

Spanish; Castilian

Intermediate

French

Intermediate

Work Experience

Product-Focused Frontend Developer & Co-Founder at Humaner AI

October 1, 2023 - July 1, 2025

Built and shipped a production-ready AI kiosk system using Next.js and Electron, optimizing performance, reliability, and real-time rendering in live environments. Led end-to-end feature implementation and resolved time-critical issues in collaboration with design and operations teams, improving real-world usability. Rapidly adopted new AI tools (ComfyUI, Stable Diffusion) and integrated them into the product pipeline.

Project Manager & Frontend Developer at ChexCar

April 1, 2023 - August 1, 2023

Contributed to deployment workflows and QA pipelines for KIA’s fleet management platform, enhancing software stability and iteration efficiency. Worked cross-functionally with QA engineers and business teams to prioritize technical challenges, refine sprints, and streamline development–test feedback loops.

Full-Stack Developer at RF Camp - Mimicle

September 1, 2022 - April 1, 2023

Developed and released multi-language mobile app using vanilla JavaScript, optimizing for compatibility and international users (Spanish/French). Managed production deployment and bug resolution across development environments.

Frontend Developer at CLA Corporation

May 1, 2023 - August 1, 2023

Built and maintained responsive web and mobile applications using React and React Native, ensuring seamless API integration and scalable UI implementation. Collaborated with designers, backend developers, and product stakeholders to deliver features with high UI accuracy and consistent UX alignment.

Community Manager - Tech Meetup at Meetup Lab

May 1, 2023 - August 1, 2023

Organized developer–designer collaboration meetups, including events featuring industry leaders, improving communication between technical and creative teams and promoting practical UI/UX process alignment.

Product-Focused Frontend Developer at Humaner AI

October 1, 2023 - July 1, 2025

Designed and developed multiple prototype and demo-focused frontends (AI Search, Creator AI, AI Companion, AI Photo Kiosk) using React, Next.js, and Electron, supporting rapid iteration in pivot-heavy startup environments. Built and shipped a kiosk-based AI photo system from prototype to production, improving real-time performance and user experience at live events. Quickly adopted and integrated emerging AI technologies (e.g., ComfyUI, Stable Diffusion) into demo features, showcasing adaptability and problem-solving under pressure.

Project Manager & Frontend Developer at ChexCar

September 1, 2022 - April 1, 2023

Supported deployment processes and participated in QA workflows and test automation for KIA Corporation's fleet management platform, helping detect issues and improve development-test feedback loops. Worked cross-functionally with QA engineers and business teams to surface recurring issues, prioritize QA engineering tasks, and strengthen development-to-test QA Automation.

Full-Stack Developer at RF Camp - Mimicle

October 1, 2021 - August 1, 2022

Developed core community and UI features for an illustration-sharing mobile app, including artwork upload and content browsing, integrating with Vanilla JS and PHP backend and MySQL-based content systems. Owned the Spanish and French app versions, building reusable features across regions and integrating shared functionality developed by other engineers.