Two years of solo iOS ownership at GRAP: keeping the legacy team-chat build shipping while rebuilding 4.0 from scratch in Swift, and continuing through a Kakao Enterprise acquisition.
I worked on GRAP from 2018 through 2020. The app was used across a range of industries — Heesung Catalysts, Amazing Brewery, Samsung Electronics, Lock&Lock, a major religious organization, and others. I had to maintain both versions: the old build had to keep shipping while the new one was constructed in parallel, with separate codebases and architectures for the same product.
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