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Hi, I’m Sage Lee Seung, a multidisciplinary designer and AI-focused professional with a track record of shipping user-centered products across B2B SaaS, design systems, and data-driven AI projects. I enjoy turning complex problems into elegant, scalable solutions by blending design thinking with front-end development and hands-on AI evaluation work. I’ve led onboarding redesigns, built token-based design systems, conducted user research, and trained AI data pipelines for real-world applications in Korea and abroad. I thrive in collaborative environments, value feedback, and am passionate about creating delightful experiences that empower teams and users.…Hi, I’m Sage Lee Seung, a multidisciplinary designer and AI-focused professional with a track record of shipping user-centered products across B2B SaaS, design systems, and data-driven AI projects. I enjoy turning complex problems into elegant, scalable solutions by blending design thinking with front-end development and hands-on AI evaluation work. I’ve led onboarding redesigns, built token-based design systems, conducted user research, and trained AI data pipelines for real-world applications in Korea and abroad. I thrive in collaborative environments, value feedback, and am passionate about creating delightful experiences that empower teams and users.

Sage Lee

Product Designer, UX Designer, Front-End Developer, +2

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Hi, I’m Sage Lee Seung, a multidisciplinary designer and AI-focused professional with a track record of shipping user-centered products across B2B SaaS, design systems, and data-driven AI projects. I enjoy turning complex problems into elegant, scalable solutions by blending design thinking with front-end development and hands-on AI evaluation work. I’ve led onboarding redesigns, built token-based design systems, conducted user research, and trained AI data pipelines for real-world applications in Korea and abroad. I thrive in collaborative environments, value feedback, and am passionate about creating delightful experiences that empower teams and users.…Hi, I’m Sage Lee Seung, a multidisciplinary designer and AI-focused professional with a track record of shipping user-centered products across B2B SaaS, design systems, and data-driven AI projects. I enjoy turning complex problems into elegant, scalable solutions by blending design thinking with front-end development and hands-on AI evaluation work. I’ve led onboarding redesigns, built token-based design systems, conducted user research, and trained AI data pipelines for real-world applications in Korea and abroad. I thrive in collaborative environments, value feedback, and am passionate about creating delightful experiences that empower teams and users.

Available to hire

Hi, I’m Sage Lee Seung, a multidisciplinary designer and AI-focused professional with a track record of shipping user-centered products across B2B SaaS, design systems, and data-driven AI projects. I enjoy turning complex problems into elegant, scalable solutions by blending design thinking with front-end development and hands-on AI evaluation work.

I’ve led onboarding redesigns, built token-based design systems, conducted user research, and trained AI data pipelines for real-world applications in Korea and abroad. I thrive in collaborative environments, value feedback, and am passionate about creating delightful experiences that empower teams and users.

Skills

Experience Level

Expert

Expert

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Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

Work Experience

Product Designer (Design System) at Dale UI

September 1, 2025 - Present

Remote designing token-based components (3+) and guidelines for an open-source library optimized for Korean typography.

Frontend Bootcamp Participant at Code It Front-End Boot Camp

April 1, 2025 - November 30, 2025

Completed 900+ hours of front-end coursework, building and deploying 3 full-stack web apps with React and TypeScript.

Advanced AI Data Trainer at Invisible Technologies

April 1, 2024 - April 30, 2025

Authored and refined 6,000+ Korean-language conversational turns through a full-cycle LLM evaluation process, building 'golden set' training data that scored 4.5/5.0 on quality control.

Product Designer at Atta Systems

June 1, 2023 - November 30, 2023

Redesigned onboarding and team-setup flows for a medical imaging B2B SaaS, cutting onboarding to 8 clicks from 12 and halving duplicate-workspace issues; delivered full web and mobile designs. Redesigned the e-book platform’s purchasing journey, halving clicks-to-purchase and removing interim pages.

UI/UX Researcher at Hanok Research

May 1, 2022 - November 30, 2022

Conducted generative research for a client’s new food-delivery strategy; surfaced 5 high-value market opportunities through qualitative and quantitative findings. Conducted 1:2 in-depth interviews and analyzed survey data across a mixed-methods study (16 interviews, 2,096 respondents, 5 Korean cities); audited conversational flows of Samsung Bixby, Google Assistant, and Amazon Alexa, plus usability and UX-writing audits of the Samsung Card app.

Project Manager at Gabia

May 1, 2021 - May 31, 2022

Drove feature strategy for a Korean groupware B2B SaaS serving 130,000+ companies through competitive analysis and Voice-of-Customer research; led rigorous pre-release QA and reported 20+ bugs before release.