Frontend Developer · Benefit Silo / Ads Platform Team

2022.12 - current

Joined early as a core frontend developer for both B2C ad-tech services and the B2B self-serve advertising platform (Toss Ads), driving 100+ product iterations that boosted MAU, sustained ad revenue, and played a critical role in the company’s EBITDA turnaround. • Spearheaded the development and maintenance of reward-based B2C ad-tech products—such as Step Counter, Lucky Draw, Offerwall, Lucky Quiz, and Money Alarm—driving strong user engagement and retention within the Benefit Tab. • Launched high-impact incentive ad formats like Live Commerce and Weekly Visit Mission, scaling the active user base from 0 to 2.2M and generating ~KRW 4B in monthly recurring revenue. • Contributed to the growth of Benefit Tab MAU from 4.92M to over 7M by running over 200 product iterations using an in-house A/B testing framework, building a highly engaging and retention-focused experience through continuous experimentation. • Served as a core frontend engineer on the Toss Ads DSP platform, redesigning authentication logic to support the Business Group model, building campaign performance dashboards, and contributing to B2B platform integration across Ads, Pay, and Commerce. • Led major UX overhauls across both advertiser-facing and admin-side workflows, applying consistent design systems and real-time validation to reduce user errors and streamline campaign creation. • Rebuilt and modernized the Toss Ads marketing site, integrating lead capture, analytics, and sales pipeline—resulting in a 2x increase in advertiser leads and a more efficient acquisition funnel.

Software Engineer · Crypto-X team

2021.08 - 2022.12

Developed a blockchain-based SNS platform (afan), integrating decentralized technology and generative AI to enhance personalized creator-fan interactions. Led the end-to-end design and development of an interactive NFT event-sharing system, increasing user engagement through a scalable web infrastructure. • aFan - SNS Platform for artist and fans using blockchain • afan Tiniverse - building metaverse platform with AI NFT & integrate on afan(SNS) service. Working as a product owner and designed overall architecture. • Ainize web renewal - frontend develop, develop a design system(using storybook) • Soul Fiction Project - Generate 15,000 NFTs(SoulLink) using Generative Art, develop event web page and participate marketing in ETHDenver2022 • Moderate dev study(clean code, programmatic programmer)

Software Engineer Intern · Maps Mobile

2021.03 - 2021.08

• Mobile-Based Personal Preference Modeling projects • Naver Maps log data with EDA (Exploration Data Analysis) • Develop a POI(Point Of Interest) recommendation model based on user click & search log

Undergraduate Research Intern

2020.09 - 2021.02

• Designing Human-AI Interaction Guidelines for Supporting Designer-Developer Communication (with Samsung Research) • Samsung Research Industry-University Cooperation Project Final Presentation Presenter

DLab(Startup Team)

Developer

2020.08 - 2020.10

A startup team started by two medical students, designer, and developers to solve the discomfort felt from the practical experience in the medical school. • Build the app for ASD(Autism Spectrum Disorder) children "mon-ami" using Java + XML + Google Firebase as a lead developer • Samsung Digital Health Hackathon 2020 Awarded Business track Grand Prize(대상)

Korea Advanced Institute of Science and Technology (KAIST)

Undergraduate Student · Computer Science

2018.03 - current

Hansung Sci. HighSchool

2015.03 - 2018.02