02 Product Works

What we have built.

01
AI-Driven Dev

Sumaho Kakari

Family Tech Support
A LINE-based service that supports elderly parents living apart with their smartphone troubles, on behalf of their family. Watches for "suspicious warnings," diagnoses screenshots, and answers questions any number of times — handing off to the family when an issue can't be resolved. Built entirely in-house from concept to launch.
Next.jsTypeScriptClaude API LINE APIStripeReleased
2026.07 —
02
AI-Driven Dev

Nochi no Koto

After-Life Procedures Navigator
A service that answers "Where do I even begin?" for people who have lost a family member. Answer just four questions and AI selects the relevant procedures from a verified master list, generating a checklist with deadlines, filing destinations, and required documents. Built entirely in-house from concept to launch.
Next.jsReact 19Claude API SupabaseVitestReleased
2026.05 —
03
AI-Driven Dev

Tabi no Ito

Private Guide Tour — Urabandai
Our own private guided-tour business in the Urabandai area of Fukushima. We handle the entire operation — from the booking website and reservation system to social media marketing. A business we run ourselves, using technology to amplify the appeal of the region.
AstroTailwindSNS Marketing Regional DXTourism
Live
04
AI-Driven Dev

Tabi no Ito Admin

Tour Operations Console
The operations console that powers Tabi no Ito. Manage bookings, customers, courses, articles, coupons, and email campaigns in one place — with Stripe billing, Google login, and access analytics all built in. We develop the back office behind our public site entirely in-house.
React 18ViteTypeScript GoPostgreSQLStripe Business System
In Operation
05
AI-Driven Dev

BizCardAI

AI Business Card Manager
A management service that uses AI to read accumulated business cards and convert them into structured data automatically. Eliminates manual entry and enables teams to share and utilise contact information. Solves the problem of cards gathering dust in desk drawers.
Next.jsTypeScript Claude APIAWSAI / OCR
Limited
06
AI-Driven Dev

Philoz

Engineer × Company Matching
A matching service that reduces post-hire mismatches in engineering recruitment. We visualise compatibility not just by skills but by values and mindset, helping companies find people who truly fit their culture. Fully owned from concept through development and operations.
ReactTypeScriptGo DynamoDBAWSStripe SaaS
2025.11 —
07
AI-Driven Dev

Qnagu

Travel Guide Chat Service
A service that connects tour guides and international visitors on the spot, bridging the language barrier. Simply scan a QR code for automatic translation into 10 languages — no app installation required, conversations start immediately.
ReactViteTypeScript AWSStripeTourism DX
2025.11 —
08
AI-Driven Dev

CodeFence

AI-Proof Coding Test System
A dedicated desktop app that prevents covert AI assistance during online technical assessments. It detects and logs screen switching and use of other tools, keeping hiring tests fair. Built to ensure candidate ability is measured accurately.
SvelteElectronNode.js Monaco EditorEdTech
2025.11 —
09
AI-Driven Dev

Patron Register

AI-Driven POS for Restaurant
An end-to-end POS system covering ordering and checkout for restaurants. QR ordering from guests' smartphones, automatic kitchen routing, and tablet-based payment — all in one package, developed entirely in-house including the marketing site.
FlutterAstroGCP Claude CodeGeminiAI-Driven Dev
2025.08 —
03 Individual Works

Between the two of us, we've been part of more than 50 projects. Here are 27 representative career highlights.

Philoz — Engineer × Company Matching Platform Development [In-house / Qurated Lab]

PM / TL / QM2 people
2025.11 — Present
Led the full cycle of a platform matching engineers and companies at the level of values and mindset — from concept and requirements definition through development and infrastructure build-out. Designed a matching logic based on 16 persona types and established a quality assurance process featuring automated code review by 30+ specialised AI agents integrated with JIRA. Targeting a 2026 release.
Next.jsReactTypeScriptGoDynamoDBAWSTerraformStripe
Built QA foundation compliant with ISO 25010 / JSTQB with coverage above 85%

Public Racing Betting Service — Mobile App Development Tech Lead

TL~10 people
2025.11 — 2026.06
Joined as Flutter Tech Lead on a consumer-facing betting service handling high-volume transactions. Led architecture design, library selection, and code review, including authoring a shared-processing policy document. Also designed and maintained an AI-first documentation framework accounting for RAG/ReAct, establishing the foundation for AI-driven development.
Flutter / DartClaude CodeGeminiBacklog

Restaurant AI-Driven POS System — Full Scratch Development [In-house]

PM1 person (full scope)
2025.08 — Present
Built from scratch — tablet app, web version, QR ordering, KDS, and landing page — using AI-driven development. Handled all phases solo: Claude Code and Gemini cross-review, specialised agent configuration, and JIRA scrum management.
Flutter / DartAstroGCPClaude CodeGemini

Housing Business BtoBtoB / BtoBtoC App — Full Scratch Development

PM~7 people
2025.03 — Present
Full scratch development of a housing-sector application: web frontend (React), mobile (Flutter), backend (Node.js), and infrastructure (AWS). Contributed to planning support, design team coordination, and architecture selection. Leveraged Claude Code for AI-driven development to improve both efficiency and quality.
ReactFlutter / DartNode.jsAWSJIRAClaude Code

Legacy System Replacement — Rescuing a Troubled Project Through to Release

PM~5 people
2024.01 — 2025.04
Joined a stalled, at-risk project and led the recovery: situation analysis, service specification review, project plan restructuring, and requirements re-definition. Also automated progress reporting using GAS-powered RPA, significantly reducing reporting overhead.
ReactAWSJIRAGAS

Auction Mobile App — Product Management

PM~7 people
2023.05 — 2024.02
Full-cycle PM from project kick-off and planning support through design team assignment, requirements definition, development, and release. Completed delivery within a constrained budget while refining the development process throughout.
React NativeMonacaFirebaseJIRA

Telecommunications Carrier — Large-Scale E-Commerce Site PM / Quality Manager (Offshore)

PM / QM~30 people
2022.09 — 2023.04
PM for an e-commerce site built by a mixed offshore team. Drove quality improvements, cost reduction, and process enhancement. In the latter phase, served as QM responsible for unit and integration testing quality — re-scoping integration tests from the upper-level design to address gaps.
Vue.jsPythonDynamoDBAWSJIRA
Achieved 20% cost reduction · 30% reduction in annual incidents

Insurance Company Internal Systems — New Development & Maintenance PM (Up to 9 Projects in Parallel)

PM~30 people
2020.06 — 2022.09
New development and maintenance of internal systems for an insurance company. Managed up to 9 concurrent projects, starting from estimation and scheduling through environment setup. Also provided technical support for web infrastructure planning, language/framework selection, CI configuration, and vendor management.
JavaJSPVB.NETPythonOracleWebSphere

Automated PCR Testing Device — Embedded Firmware Development

M~4 people
2019.07 — 2020.05
New development of a high-performance successor device. Responsibilities spanned embedded firmware development, an acceptance-testing app, a control screen (C#), and a web server built on top of the board.
C / C++C#HTML5 / JSSQL ServerARM Cortex-M4

Drainage Station & Dam — Control PC Software Development

L~15 people
2018.10 — 2019.06
Led the development of control PC software interfacing with PLCs. Covered all phases from requirements definition through on-site delivery. Implemented both a Windows application and a web service component.
C#VC++JavaHTML5 / JSSQL Server

Space Station Satellite Robot Instruction Automation System Development

SL~4 people
2018.06 — 2018.09
Developed an automation system for issuing instructions from a space station to a satellite robot. Although a small project, handled virtually the entire scope from basic design through testing independently. Led the C# logic proposals.
C#

Securities Firm — Business-Support Windows Application Development

M~10 people
2017.10 — 2018.05
New development of a business-support desktop application for a securities company. Handled all phases from requirements definition through release. The project involved complex calculation processing and high-volume data handling via SQL, with additional web development support as needed.
C#SQL Server

Government Agency System — Maintenance & Operations

M~10 people
2016.10 — 2017.09
Maintenance development and operations for a government agency system. Responsible for detailed design through integration testing. Worked in an environment with rigorous testing and quality standards, practising a development approach that placed testing at the forefront.
C#JavaCOBOLSQL Server
04 Individual Works

Nochi no Koto — After-Death Procedures Navigator: Development & Launch [In-house]

TL1 person (solo)
2026.05
A web service for people who have lost a family member. Based on four input answers, AI selects applicable procedures from a verified master database of 61 items and generates a personalised checklist with days remaining, filing destinations, and required documents. Built and launched entirely solo: full-screen design in Figma, Next.js implementation, real-time family sync via Supabase Realtime, VPS infrastructure, and CI/CD pipeline.
Next.jsReact 19TypeScriptTailwind CSS v4Claude APISupabaseResendVitest
163 tests · coverage 93.72% / Semgrep security scan: 0 findings

Enterprise Inventory Allocation System — PoC Development (AI-First)

SL~20 people
2025.12 — 2026.03
Designed and implemented a modern web application using Next.js 15, Hono, and PostgreSQL. Built IaC with AWS CDK and GitHub Actions CI/CD. Implemented a 14-table DB schema designed with Salesforce migration in mind, Row Level Security for access control, and a maintainable architecture following DDD and onion architecture principles.
Next.js 15HonoTypeScriptPostgreSQLAWS CDKGitHub Actionsshadcn/uiDrizzle ORM
AI/LLM-first development achieved 3x the conventional development velocity

Qnagu — QR Chat Service for Tour Guides: Development [In-house]

TL1 person (full scope)
2025.11 — Present
Sole ownership of a web chat service — from concept to development to operations — featuring real-time translation in 10 languages, location sharing, and QR-based room creation. Runs entirely in the browser with no app required. Rebuilt with a quality-first approach; targeting a 2026 release through AI-driven development.
ReactViteTailwindTypeScriptAWSStripe

CodeFence — AI Cheating Prevention Coding Test System: Development [In-house]

TL1 person (full scope)
2025.11 — Present
Conceived, designed, and developed an Electron desktop app to prevent AI misuse in assessments. Implemented forced full-screen mode, shortcut key disabling, focus-loss detection, and activity logging. Planned for integration with Philoz's skill evaluation module.
SvelteSvelteKitElectronNode.jsMonaco Editor

Philoz — Engineer Matching SaaS: Development [In-house]

TL2 people
2025.11 — Present
End-to-end ownership of an engineer hiring matching SaaS built on a 16-persona system — from concept and design through development and operations. Rebuilt with a quality-first focus; targeting a 2026 release through AI-driven development. Also driving SNS marketing and referral programme initiatives.
ReactTypeScriptGoDynamoDBFirebase AuthStripeAWSPlaywright

Tabi no Ito — Travel Website Development & Operations [In-house]

PM~5 people
2025.07 — Present
Built from scratch: an Astro public website, a React + Vite admin dashboard, and a Go REST API (Stripe invoicing/webhooks, LINE notifications, email delivery). Set up two VPS environments (staging/production) with CI/CD. Led PM, PdM, marketing, and business development end-to-end — from service design compliant with Japanese Travel Agency Act to advertising operations, SEO, and partnership outreach.
AstroGoReactViteTypeScriptPostgreSQLStripe APILINE Messaging API

Large-Scale E-Commerce Site — Frontend Modernisation (Webpack → Vite Migration)

SL~20 people
2025.07 — 2026.03
Fully migrated a legacy development environment (Node v12 / Webpack) to Vite + Node v18, resolving complex dependency chains and cutting build time by 90%. Also standardised code quality via ESLint, Prettier, and Git Hooks, and optimised the CI/CD pipeline.
VueNuxtTypeScriptViteNode.jsGoAWS
Build time reduced by 90%

Form Builder & Lottery Management System Development (Google Forms-type)

M~5 people
2024.12 — Present
Consistently developed both the frontend (Vue) and backend API (Go) for a form builder and lottery management system. Handled Go performance tuning, architecture review, and version upgrade work. Also led onboarding support for new team members and organised internal study sessions.
VueGoDynamoDBElasticsearchDockerAWS

3D Chatbot AI Search System Development

TL~5 people
2024.12 — 2025.06
Implemented 3D animation effects using Three.js alongside a large-scale search feature. Defined the implementation approach balancing performance and UX. Contributed to PoC work and effort estimation from the requirements definition stage.
ReactNext.jsThree.jsGSAPTypeScriptGoAWS

CMS Admin Dashboard — Modern Migration (Vue 2 → Vue 3, 10,000-page scale)

TL~5 people
2024.04 — 2024.11
Built a CI/CD pipeline from scratch and completed the migration of a 10,000-page-scale system with zero incidents. Performed a phased migration from Options API to Composition API and enforced strict TypeScript type definitions throughout.
Vue 3TypeScriptSassGSAPkurocoCMS

SaaS Business System — Frontend Development

SL~15 people
2023.10 — 2024.04
Designed a scalable architecture with long-term maintainability in mind, establishing the project's technical foundation. Proactively investigated and resolved technical uncertainties upfront, providing the PM with the information needed to build an accurate schedule. Also led component design based on Atomic Design.
VueTypeScriptMySQLAWS

Education & Social Welfare Management System Development

M~10 people
2021.12 — 2023.09
Handled both Laravel backend and Vue.js frontend end-to-end — from API design through UI implementation. Participated in customer requirement interviews and technical specification drafting. Practised agile development in two-week sprints.
VueTypeScriptLaravelPHPMySQLAWS

Event Industry Management System Development

SL~10 people
2019.04 — 2021.11
Served as sub-leader on projects of 10–20 people, responsible for progress management and technical support. Established the foundations for quality and document management through test design, test execution, and creation of detailed design documents and test specifications.
VueTypeScriptLaravelPHPMySQLFirebase

Internal Asset Management System — New Build (Full-Cycle Development)

M (Intern)~3 people
2018.12 — 2019.03
Internship project with end-to-end ownership: concept, design, implementation, testing, release, and maintenance. Delivered an intuitive UI operable without a manual, and practised waterfall-style documentation management throughout.
JavaScriptLaravelPHPMySQL

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