Senior Software Engineer
Heeyun Lee
I build mobile apps
Software engineer building mobile experiences with Flutter and Swift — currently at dub, the US's first copy-trading platform.
About
I'm a software engineer who cares about the details — the kind of mobile experiences that feel fast, considered, and a little delightful. These days I build at dub, the US's first copy-trading platform, helping people invest alongside investors they trust.
Before dub, I was on the mobile team at Tonal, the world's smartest home gym — a good fit, since I'm as serious about training as I am about shipping. Before tech, I served two years in the Republic of Korea Marine Corps as a Signal Corpsman, and I studied Business Analytics and Finance at Pace University. Markets, fitness, and software keep showing up in everything I make.
The path so far
Tap an entry for the details.
- Double major in Business Analytics and Finance; graduated summa cum laude.
- Learned to think in models and spreadsheets before thinking in code.
AnalyticsFinance- Maintained communications equipment and infrastructure for two years of service.
- Served as a Sergeant and Squad Leader, responsible for an 8-member squad.
- Took away a lasting respect for systems that have to work the first time.
CommunicationsLeadership- Migrated the mobile app's networking from REST to GraphQL, cutting payload sizes by 99% and making key screens 50% faster.
- Drove a 400% increase in App Store reviews by analyzing user behavior to find the right moments to ask.
- Spearheaded the launch of dub's app on the App Store from scratch, coordinating across engineering, compliance, design, and operations.
- Built the leaderboard that helped validate the copy-trading marketplace.
- Implemented KYC and identity verification, partnering with compliance and operations teams.
- Promoted to Senior Software Engineer in 2026.
Toolbox
Featured projects
All projectsHave an idea, or just want to talk shop?
I'm always up for a good conversation about apps, markets, or training.