Crafting Comfort
Through Technology.
Freelance Backend Engineer & Mobile App Developer. Leveraging 20+ years of IT engineering experience, providing end-to-end support for web systems and mobile apps from architecture to operation.
Not just building, but operating and continuously refining.
Majored in Computer Science through College of Technology, University, and Graduate School. Over 20 years of experience as an IT engineer specializing in backend (Python, TypeScript, AWS), frontend, and infrastructure.
Proven track record spanning from startup launches to leading engineering teams for large-scale production maintenance.
As an independent developer, I design, build, and operate several mobile applications. Dogfooding my own products drives daily UI/UX improvements and growth focused on user experience.
Our Applications
Mobile applications in active operation. View all apps →
MoneyFollow money-follow
Organize income, expenses, and life events to simulate your future asset trends.
Continuously update assumptions as your life changes while tracking monthly assets. Transform future money anxiety into clear, visible plans.
Mainichi Patch eye-patch
Record daily eye patch training sessions on a calendar to support goal achievement.
A support app designed to make children's vision training (occlusion therapy) enjoyable. Features timers, calendars, and customizable reward stamps.
What We Offer
01Web & Mobile App Development
API & batch system implementation in Python & TypeScript. Cross-platform iOS/Android app development using React Native (Expo).
02DX & In-house Development Support
Comprehensive support from rapid prototyping and AWS infrastructure design to production deployment, analytics, and iteration.
03Indie Developer Support
Assistance for developers who launched AI-generated apps and need help with bug fixes, app store submissions, and maintenance.
Tech Stack
Track Record
Ad Distribution System Launch from Scratch (3.5 years)
Handling high-volume real-time ad requests with strict latency and high availability requirements.
Built a scalable backend centered on Python. Practiced hands-on ad operation to continuously improve delivery efficiency models based on live data.
Autonomous Planning & Operation of Mobile Apps (9 years, ongoing)
Maintaining high quality across development, security, compliance, and user support with solo developer resources.
Adopted React Native Expo and Supabase. Automated CI/CD via GitHub Actions and leveraged generative AI to maintain multiple live apps independently.
Business Process DX & Automation (1 year, ongoing)
Eliminate manual Excel/paper workflows, reduce operational errors, and streamline business processing times.
Interviewed operational teams to design targeted software solutions. Managed design, release, and feedback-driven enhancements end-to-end.
Contact Us
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