I build practical web apps for real business operations.
I'm Shunta, a Japanese, Sydney-based full-stack engineer (frontend-focused) with 6+ years building business web apps for clients in Japan and worldwide. I focus on operations dashboards, workflow tools, and AI/OCR-assisted systems in React, TypeScript and Next.js.
Software that fits how your team actually works
I build the operational tools businesses run on every day, not marketing sites. Every engagement starts from a real workflow problem and ends with something your team can actually use.
Operational Dashboards
One live view for staff, managers and owners: status, tasks, bookings, guests and daily operations in one place, so nothing slips through.
- Status & task tracking
- Search, filters & roles
- Reporting views
Workflow Automation
Web apps that replace repetitive manual work, spreadsheets and scattered email threads with one clear, trackable process.
- Replace spreadsheets
- Trackable steps
- Fewer manual checks
AI / OCR Integration
Practical AI and OCR for document extraction, verification and reporting: automated where it helps, with human review where it matters.
- Document extraction
- Human-in-the-loop review
- AI-assisted reporting
React / Next.js Web Apps
Maintainable admin tools, internal systems and client-facing portals in React, TypeScript and Next.js, designed to be extended later, not rewritten.
- Admin & internal tools
- Client-facing portals
- Type-safe & maintainable
Legacy UI Modernization
Older, hard-to-maintain business screens rebuilt as clean, reliable React interfaces, keeping the business logic your team depends on.
- Legacy → React
- Shared components
- Maintainability gains
Selected case studies
A closer look at the business web applications I've built: operations dashboards, workflow tools, and AI/OCR-assisted systems. Client and company names are anonymized.
I clarify the messy parts before writing code
The expensive mistakes come from building the wrong thing quickly. My process catches that early, especially now that AI makes it easy to build fast in the wrong direction.
I don't just code screens
I clarify messy requirements before building. AI writes code fast, but it builds the wrong thing just as fast. The value is the human judgement around it: workflow understanding, the spec, the architecture, the testing and the review.
Understand the workflow
I start from how the work actually happens today, the spreadsheets, manual checks and email threads, not an idealized version.
Clarify business rules & edge cases
I pin down the rules that break naive assumptions, like “one reservation = one guest”, before any code is written.
Design the system flow
I map the data, states and screens so the build has a clear shape, sensible data ownership and room to grow.
Build the MVP
I build the smallest version that delivers real value, using a structured AI-assisted workflow to move fast without losing control of quality.
Test with real scenarios
I test against messy reality, multiple guests, failed scans, odd sessions, not just the happy path.
Improve & stabilize
I handle production issues, edge cases and the explaining, so the system keeps working well after launch.
Tools chosen for the job
My core is React, TypeScript and Next.js. Around that, I use whatever fits the workflow, and I keep AI-assisted development structured rather than uncontrolled.
Frontend
Backend / API
Data
Cloud / Deploy
AI / OCR
Integration
Engineering, business sense, and a bias for things that get used
I'm a Japanese software engineer based in Sydney. Over 6+ years, first across enterprise systems in Japan, now with clients in Japan and worldwide, I've focused on one thing: building business web applications people rely on every day.
My strength is the combination: solid React and TypeScript engineering, a genuine grasp of business workflows, and real experience wiring in AI and OCR where they actually help. I'm especially drawn to tools that cut manual work and make daily operations easier to run.
I work the way a good freelance partner should: clarifying the messy parts before building, handling the testing and production issues, and explaining things in plain language. I use AI-assisted development to move fast, but keep the architecture, review and judgement firmly in human hands.
- Based in
- Sydney · available worldwide
- Experience
- 6+ years
- Focus
- React · TypeScript · Next.js
- Languages
- English & Japanese (native)
- Engagement
- Freelance · contract · project
- Strength
- Workflow to working software
More than someone who can code
Plenty of engineers can build screens. The difference is what happens around the code: the understanding, the judgement and the follow-through.
Business workflow first
I start from how your team actually works, then choose the technology, not the reverse.
Strong React & TypeScript foundation
6+ years of real business UIs: dashboards, tables, forms and status flows, built to last and easy to extend.
Enterprise rigor, freelance flexibility
The discipline of long-running enterprise systems, delivered with the speed of an independent engineer.
AI & OCR that's actually practical
I integrate AI and OCR into real workflows, reporting, document extraction, verification, with human review where it counts.
Clear with non-technical clients
I explain trade-offs, issues and progress in plain language, with clear written updates in English.
End-to-end ownership
From requirements to implementation, testing, troubleshooting and explanation: one accountable person.
Let's build something that actually gets used.
Whether you've got a rough idea or a finished spec, I'd like to hear what you're trying to fix.