Problem
A Korean fintech had a legacy Web3 wallet Flutter app that had ballooned to 80MB with no coding standards, no CI, and patchwork architecture. The team was shipping slowly and users were dropping off at install. Leadership needed the codebase restructured and the team's velocity restored.
What I built
- Overhauled the legacy codebase and cut app size from 80MB to 11MB — ~86% reduction — by auditing dependencies, removing dead code, and restructuring asset pipelines.
- Established coding standards and architectural patterns (MVVM + DI) that were adopted company-wide.
- Introduced TDD and CI/CD automation — tests + multi-environment deploy pipelines on what had been a manual, ad-hoc release process.
- As Project Leader, drove product planning and system architecture. Translated feature descriptions into technical specs and managed the engineering team.
Outcome
Installable, maintainable Web3 wallet app at a fraction of the original size. Team velocity recovered, release cadence stabilized, and the architecture I introduced became the company standard.
Stack
Flutter Web3 MVVM TDD CI/CD Team leadership
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