Byeongjun Moon

Byeongjun Moon

Product Designer

18 y/o. Spent the past few years across community, product, design, and engineering roles. Currently working on Mainstream.



We raised $1.1m from world-class investors to reimagine the way people interact with decentralized governance.

Interested in working for us? Reach out at


Started a $500k internet experiment to alleviate financial barriers for thousands of students to attend blockchain conferences. Supported by Vitalik Buterin, Ameen Soleimani, and 3,000+ others.

Work Experience

2022 — Now
Los Angeles, CA

A modular, end-to-end decentralized governance platform.

Raised $1.1m+, backed by Lemniscap, Samsung NEXT, Larry Sukernik (Reverie), Linda Xie (Scalar Capital), Daryl Xu (Coinbase), & more.

2022 — 2022

Crypto-to-charity donation escrow service.

Left after a few months to start Mainstream Labs.

2022 — 2022
Product Designer & Engineer at Balance

The first-ever iOS-native Ethereum wallet.

Left high school & moved to San Francisco to lead design & frontend efforts in a 5-person team ahead of launch. Product showcased at ETHDenver 2022.

2020 — 2021

Built a novel Brain-Computer Interface (BCI) solution, Kinisi, to aid paralyzed patients with rehabilitation.

2020 — 2020
Consultant at UN Women

Delivered research & suggestions to increase female Syrian refugees’ participation in the Jordanian digital economy.

2020 — 2020

Built a machine learning-powered water quality sensing solution impacting 27k+ residents in Flint, MI and 12k+ residents in Newark, NY.

2020 — 2020
Design Intern at Talk Social
San Francisco, CA (Remote)

Side Projects


A 66-person internet prank to create New York's Best (Fake) Steakhouse. Featured on the New York Times, New York Post, The Guardian, abc7NY, and more.


Participated in weekend-long IRL rabbit-hole-athons for technologists: an intimate retreat/hackathon dedicated to reading, thinking deeply about a topic, and sharing your learnings with others.


The world's first decentralized toy drive.

Raised $50k from internet anons to deliver gifts to underserved children around the world.


Participated in the world's longest hackathon on land, on a train across America, alongside people like Tom Preston-Werner (founder of GitHub) onboard.


2020 — 2022
Cambridge, MA

I helped lead a community of 10k+ students at the Harvard Innovation Lab, hosting panels for educational discussions and public policy writing to initiating startup incubators and data science research projects related to the coronavirus.

I led the Coronavirus Visualization Team’s Design team, where we coordinated 350k+ articles of PPEs donated during the pandemic.

I also worked on a series of policy-writing events called Policy for the People at the Harvard Institute of Politics. We hosted 3,000+ participants, published 700+ policy brief submissions, and more.

2018 — 2020
Additional experiences
Vancouver, BC


2022 — Now
Los Angeles, CA

Sophomore at the Iovine and Young Academy (founded by Dr. Dre, <40 students/year) on Merit Scholarship.

I research AI (In Vivo Group), design (under Prof. Yihyun Lim), and crypto (Blockchain@SC). I started sundays@usc (a student collective to work on side projects every Sunday), and contribute to various student startup ecosystems on campus.