Portfolio 制作実績
A storefront built for a contract employer, a Sumihara service, earlier freelance customer work, and public projects. Each entry explains my part in the work.
In use
Contract employment · 2026–present
A custom wallpaper storefront and backend built for Cossette Productions LLC. I developed the purchasing flow and the tools for managing content and orders.
Sumihara service
Daily collection of public pages with a written brief of observed text changes. Each brief includes source URLs and collection dates, and identifies pages that could not be collected.
The first collection sets the baseline. The service does not predict competitors' decisions or guarantee that every change is caught.
Read the service scopeProfessional background
These are accounts of my work, not endorsements. The organizations named here and above are contract employers, not a list of Sumihara customers.
Contract employment · April–July 2026
DevSecOps Engineer I
Developed an internal operations portal using Next.js and TypeScript, with MongoDB, Auth0 and Vercel. Led penetration testing of systems and applications, documented findings and supported remediation.
Implemented Azure controls and monitoring for SOC 2 readiness using Vanta. Automated device provisioning with Intune and Windows Autopilot, and resolved an AWS Step Functions issue affecting core services and integrations.
Freelance · 2023–2025
My earlier freelance consulting clients are not named here. This is a summary of the work, not a client endorsement.
I provided IT support, system administration and cybersecurity consulting for Windows, Linux and macOS systems. The work included repairs, scripting, network security configuration and operating system hardening.
For references on a relevant engagement, ask me first so I can confirm who is willing to be contacted.
Code & prototypes
Small tools and a hackathon project. Repository links let you inspect the implementation and its limits.
Team project · October 2024
Main developer on an emergency preparedness application built during a 48-hour hackathon. The project earned Crowd Favorite at PlutoHacks 2024.
A hackathon prototype, not a deployed emergency service.
Read the EMaps projectCommunity tool
A Discord bot that assigns active and inactive roles based on message activity over seven days. It uses Node.js and discord.js, with SQLite for persistent activity tracking.
Inspect ActivityBot on GitHubPersonal automation
A Python browser automation tool for Yahoo! Japan auctions through Neokyo. It supports a user-set bid limit and a test mode that stops before submitting a bid.
Live bids are binding. The repository documents account requirements and the risks of automated use.
Inspect PipperBot on GitHubSend an outline of what you need and what is already in place.