Leon Matsui Strømsvik

About Me

Web developer and cloud infrastructure engineer based in Tokyo. Student in the Department of Mathematical and Computing Science School of Computing, Institute of Science Tokyo. Member of traP. Lead of the IT / Network Bureau for the 2026 University Festival, managing servers, DNS, Cloudflare systems, CI/CD, and internal web services. Core developer of the Koudaisai Portal, the unified digital platform for the festival.

I focus on building small, fast, and maintainable web applications.

Services

• Small web applications and internal tools
• Cloudflare Workers APIs (D1 / KV / R2)
• Bug fixes and code improvements
• Automation scripts
• Front-end features (Astro / Next.js)
• Infrastructure setup (DNS, CI/CD, Cloudflare)

Tech Stack

• Cloudflare Workers / D1 / KV / R2
• TypeScript / JavaScript
• Astro / Next.js
• Rust (API)
• SQL

Projects

• Koudaisai Portal: Full-stack platform managing internal systems, authentication, and festival data. https://portal.koudaisai.jp
• Koudaisai Plans Info API: API service for festival schedules and plans, built with Cloudflare Workers + KV. https://github.com/jizi-isct/koudaisai-plans-info-api
• Jomon: Accounting and expense management system used inside traP. https://github.com/traPtitech/Jomon

Contact

• GitHub: https://github.com/pasmophobia
• Email: contact@leonmatsuistroemsvik.com