Curriculum Vitae (Summary)
| Full version (English) | 日本語（要約版） |
Basic Information
| key | value |
|---|---|
| Name | Shirow Ozawa |
| Date of Birth | 1972-10-10 |
| Residence | Tokyo, Japan |
| Highest Education | Faculty of Education, Yamanashi University |
Career Summary
Full-stack engineer with 15 years in software development, focused on TypeScript / React front ends and Node.js / Java / Ruby back ends. Currently development team leader on a logistics DX SaaS product, where AI-driven development with Claude Code is part of the daily workflow.
- AI-driven development as a daily practice: works in Claude Code every day and introduced it to the team, from parallel implementation to automated code review and self-healing E2E tests.
- Leading a 4-person team on “LogiGo,” a logistics DX SaaS (TypeScript + React / NestJS + Prisma / PostgreSQL / AWS), owning everything except infrastructure configuration.
- Built an E2E / VRT test platform from scratch with Playwright and led the full migration, including nightly runs, automatic issue filing on failure with AI-driven auto-fixes, and E2E coverage measurement.
- Drove measurable business results: +12% CVR from conversion-oriented UI work, +10% new customer inflow and +5-6% SEO score from content platform improvements.
- Delivered products at scale: PWA for a retail electricity provider with 500,000 users, WebRTC video lesson platform with 40,000 unique users.
- Modernizes legacy code bases into maintainable front ends, with unit testing, CI/CD, and developer tooling as a standing part of the work.
- Broad domain background: logistics, energy, finance, EC, public sector, and telecom, across both product companies and contract development.
AI-Driven Development (Claude Code)
Claude Code is my primary development environment, used daily for implementation, refactoring, review, and operational work. I introduced it to my current team and built the practices and tooling around it.
- Parallel development: run multiple Claude Code sessions against separate git worktrees so several features and fixes progress at once; my own work shifts toward specification, decomposition, and review.
- Custom skills as team assets: author reusable Claude Code skills that encode the team’s workflows — PR creation, test-first bug fixing with RED / GREEN commits, review-comment resolution, and specification Q&A grounded in the code base — so any member can repeat the same process.
- Agents in CI: combine Claude Code with GitHub Actions for automated code review, review requests, two-way sync with the ticket management system, and notifications.
- Self-healing tests: E2E failures automatically file issues and trigger AI-driven fixes, keeping the nightly suite actionable rather than noisy.
- Quality guardrails: AI output is treated as input to review, not as a shortcut — tests are written to fail first, lint / VRT gates run in CI, and every change goes through human review.
Core Skills
- Front-end development and design with JavaScript / TypeScript + React.js or Vue.js
- Refactoring legacy code into modern front-end solutions
- Establishing front-end foundations (test environments, initial framework setup, CI/CD)
- Maintainable, reusable code centered on unit testing
- Server-side development with NestJS, Ruby on Rails, express, and Spring Boot
- AI-driven development with Claude Code: parallel sessions, custom skills, and development process automation
- Agile / Scrum practice; team leadership, code review, guidance, and training
Technology Stack
Language
Frameworks and Others
Work Experience
SImount Inc. (2026/01 - Present) — Development Team Leader
Full-stack development of “LogiGo,” a logistics DX SaaS platform. Responsible for all aspects of development except infrastructure configuration: new features, performance optimization, API design, and test infrastructure. Team of 4. Introduced Claude Code to the team and established the parallel development method the team now works with.
Stack: TypeScript + React / NestJS + Prisma / PostgreSQL / AWS / Playwright / GitHub Actions
- Led feature development for billing and payment: ancillary charge entry and aggregation, report / CSV export, consumption tax support (tax category, tax-inclusive/exclusive pricing, rounding), and closing-date-based search and aggregation.
- Delivered extensive features for the dispatch planning board: forced assignment / swap / unassignment, vehicle inspection due-date alerts, enhanced search, and drag-and-drop defect fixes.
- Expanded master data management (vehicles, sites, customers; customer-site linking UI) with the underlying data model improvements.
- Built the E2E / VRT test platform with Playwright from scratch and led the full migration: visual regression testing, nightly automated runs, automatic issue filing on E2E failure with AI-driven auto-fixes, and E2E coverage measurement.
- Automated the development process with Claude Code skills and GitHub Actions: code review, review requests, two-way sync with the ticket management system, and notifications; ran multiple Claude Code sessions on git worktrees to develop features in parallel.
- Improved CI/CD and performance: faster runners for cost and time savings, migration drift detection, VRT stabilization, API response compression, monitoring alarms as IaC, and a permanent fix for a production incident caused by expired authentication tokens.
Server-Free Corporation (2024/02 - 2025/11) — Detailed Design, Implementation
Business system development for a major infrastructure company, covering backend API development, front-end modification, and cloud deployment. Two-person teams.
Stack: React + TypeScript / Spring Boot / MySQL / Azure
- Developed a data integration batch and a PDF generation REST API with Spring Boot.
- Modified the front end of a business system built with jQuery.
- Deployed the Spring Boot API to Azure App Service.
- Reason for leaving: personal reasons.
Zehitomo Co., Ltd. (2022/08 - 2023/08) — Detailed Design, Implementation, Testing, Code Review
Development of a matching service between small and medium-sized businesses and individual customers. Led design and implementation of features that improve user convenience, and led front-end improvement activities, including responsive design based on experience from smartphone app development. Scrum team of 3-5.
Stack: TypeScript + Next.js / Redux, AngularJS / express, MongoDB / AWS ECS, S3 / WordPress
- Implemented conversion-oriented UI, improving CVR by 12%.
- Developed APIs with express and MongoDB on AWS ECS and S3.
- Improved low-quality blog content, raising the SEO score by 5-6%, and built new content that increased new customer inflow by 10%.
- Reason for leaving: voluntary retirement due to the company’s declining performance.
2nd Community Co., Ltd. (2022/01 - 2022/07) — Lead Engineer, Video Streaming
Development of a WebRTC web application for online lessons, providing chat, video meetings, and drawing, on a site with 40,000 unique users. Two-person team.
Stack: Vue / Nuxt.js / Ruby on Rails / Docker / Amazon S3
- Implemented the video meeting screen, including core functionality and responsive design.
- Added file attachment and emoji support to the chat feature.
- Implemented Undo / Redo for the drawing feature using localStorage.
- Reason for leaving: the company suddenly required all employees to keep cameras on at all times during working hours.
GoodWorks Co., Ltd. (2021/02 - 2021/12) — Detailed Design, Implementation, Code Review, OJT
SES. Four projects, in teams of 1 to 5.
- Video streaming web app (2021/05 - 2021/11): front-end and batch design and implementation; specification changes and unit / integration testing for the billing report batch used in usage settlement; technical investigation for unicast delivery; built and deployed a web app that authenticates movie ticket numbers for home viewing.
- Log collection batch for a public transportation smartphone app (2021/10): solo development with Python, AWS Batch, and AWS SAM.
- Disaster information management system for government agencies (2021/04): front end with Vue + Amplify, Apollo Client, GraphQL, and AWS CodeCommit.
- IoT device coordination system (2021/02 - 2021/03): entrance / exit management for construction workers for COVID-19 prevention; front end with Vue3 / Vue, back end with express.
- Reason for leaving: wanted to work at a company doing in-house product development.
System I Co., Ltd. (2019/12 - 2020/12) — Requirement Definition through Integration Testing
Development of a PWA for a retail electricity provider’s contract users, 500,000 users. Team of 5-10.
- Prototyped the user authentication platform with Cognito.
- Developed a push notification creation batch with TypeScript.
- Dockerized an existing Node.js application.
- Reason for leaving: workplace harassment.
Mulodo Co., Ltd. (2019/03 - 2019/12) — Requirement Definition through Integration Testing
Outsourced development. Teams of 5-10 and solo work.
- Customization and maintenance of an EC platform for an EC site operator, with PHP / Laravel; also handled inventory management tooling.
- Designed and built a P2P chat app: authentication platform on Firebase (Realtime Database, Authentication), front end with React Native for Web, iOS, and Android.
- Reason for leaving: the company went bankrupt.
Koei System Co., Ltd. (2017/10 - 2019/02) — High-level Design through Testing
Development and service provision of a dispatch system. Solo development across four projects.
- Built a RESTful PDF generation web API in C#, generating PDFs from database records on POST.
- Built a web API for interfacing with Oracle.
- Developed the dispatch system front end: an interactive dispatch table for tank trucks with D3.js.
- Built a web app visualizing server operation records, with a batch converting log files into Google Charts JSON; deployed and operated an HTTP proxy on AWS EC2.
Delta Wing Co., Ltd. (2013/03 - 2017/09) — Design, Implementation, Testing
SES. 13 projects in waterfall and agile teams of 1-6, mainly in finance, public sector, telecom, and content.
| Period | Project | Technologies |
|---|---|---|
| 2017/07 - 2017/09 | International bank account information system | Java, HiRDB |
| 2017/02 - 2017/06 | EC web app and iOS app maintenance, content provider app | Objective-C, PHP / Smarty, MySQL |
| 2016/12 - 2017/01 | 4K set-top box for satellite broadcasting | VanillaJS |
| 2016/10 - 2016/11 | Mobile base station management system (basic design of disaster response features) | — |
| 2016/04 - 2016/09 | Report management system for a bank (PDF and SOAP API DLLs) | C++ |
| 2015/10 - 2016/03 | Maritime defense ship position system, GIS server product selection | JavaScript / D3.js, Java |
| 2015/03 - 2015/09 | BI operations for content business; customer management tool for insurance agents | Web app over mainframe data |
| 2014/08 - 2015/02 | Membership site renewal for Disney Japan (RESTful API) | Java / Apache Wink, jQuery |
| 2013/10 - 2014/07 | Parcel delivery support system; credit card merchant management system | Batch, stored procedures, JSP |
| 2013/03 - 2013/11 | Corporate internal SNS iOS app; iOS port of a pedestrian navigation app | Objective-C |
Earlier Career (1995 - 2013)
| Period | Company / Role | Summary |
|---|---|---|
| 2012/10 - 2013/02 | Pleasant Co., Ltd. | Middleware for financial institutions; printing and process launch DLLs for a bank merger (team of 3) |
| 2011/10 - 2012/03 | Frontier Co., Ltd. (internal SE) | Migrated a C# LAN application for logistics material management and ordering to a web app (Java, JSP, MSSQL) |
| 2010/04 - 2011/03 | Public servant | Elementary school teacher |
| 2007/11 - 2009/04 | Adecco Co., Ltd. | B Flets salesperson |
| 2003/02 - 2005/02 | Yamato Transport Co., Ltd. | Sales driver |
| 2002/07 - 2003/01 | Number Four Co., Ltd. | Contract development, solo: IC card automatic login (Visual C++), image extraction tool for real estate agents (VB6), mobile bulletin board CGI (Perl, HDML, cHTML) |
| 1995/04 - 2001/03 | Public servant | Elementary school teacher |
Extracurricular Activities
- OSS and personal development: backlog-tamer (CLI tool), and pull requests to OSS including MDN documentation translation.