About
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2021
Founder Minjae Sung moved into college and saw the problem firsthand: third-party marketplaces were full of unverified profiles and scam posts. After being scammed himself, he set out to build a safer way for students to trade.
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2022
With no budget for outside developers, Minjae taught himself to code so classmates could trade confidently with verified school emails.
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2024
Engineer Milan Rona joined as co-founder, rebuilding the backend for speed, security, and effortless scaling.
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2025
Our five-person team launched Swap Door and attracted 598 students and 960 total listings in 90 days across the U.S colleges. We’re growing fast and still driven by the same mission: give every campus a trusted marketplace.
