Problems into tools. Days into entertainment.

Video playback and ad monetization

• Work on player features for both live and on-demand streaming, including the ad integration layer around playback
• Replaced playback-related code with The Composable Architecture, improving maintainability and testability

Large-scale live event delivery

• Delivered the streaming experience for the Milano Cortina 2026 Winter Olympics, including a dedicated top screen and event UI
• Built reusable player modules covering both live and VOD playback under a hard, externally fixed deadline

CI with Xcode Cloud

• Tests existed but there was no CI. Introduced Xcode Cloud so every pull request runs automated tests and build verification
• Stabilized the development cycle for the whole iOS team

Onboarding redesign

• Rebuilt the walkthrough flow so new users understand the app immediately

In-housing development and rebuilding code quality

• The app had been outsourced since the company's founding, had no unit tests, and relied on manual QA to catch bugs
• Introduced a multi-module architecture and reached 80%+ test coverage on new modules
• Drove incremental refactoring with four iOS/Android engineers without pausing feature work, cutting post-release bug reports by about 40%

Collaborative recording

• Designed and built a feature that lets creators record together remotely
• Introduced agile practices, reviewing increments weekly with the PdM and running mid-development validation with five creators
• 100+ creators adopted collaborative recording after launch

Live broadcasting

• Implemented real-time audio broadcasting on both iOS and Android using Agora
• Built the creation, start and scheduling screens from scratch, including pre-broadcast checks for network state and permissions
• Enabled low-latency delivery and listener participation for two-way communication

Backend (Go) API development

• Designed and implemented the session API for collaborative recording with OpenAPI
• Built the live broadcasting database and its APIs around Agora
• Developed the APIs for room admission, rejection and exit flows

Android work

• Designed and implemented creator-only comment display and control, including broadcast-type detection
• Migrated the Android recording app's UI components to Material 3

Hiring

• Ran first-round engineering interviews, assessing both technical skill and culture fit
• Contributed to three hires that strengthened the team

Team lead on the SmaRyuTruck launch

• Volunteered to take over as team lead partway through the project
• Coordinated development priorities and bridged stakeholders while the CEO acted as product owner
• Visited customers directly to understand real logistics operations and fed those findings into product requirements
• Built the freight delivery request page

Rebuilding the PickGo team

• After a wave of departures I was the only remaining developer on the product
• Got up to speed on the existing codebase and business flows quickly enough to keep shipping
• Delivered the JAL air freight integration alone, from requirements to release
• Implemented dynamic delivery pricing that responds to seasonal demand

Hiring

• Ran first-round engineering interviews

• Improved existing features and UI/UX to grow the user base
• Designed and implemented a community feature connecting sports enthusiasts

• Operated and maintained a network authentication system for a major Japanese enterprise
• Joined a large-scale system replacement project, handling infrastructure setup through migration
• After moving to the development division, maintained and replaced systems for education and entertainment businesses