Hiroki Komamiya

Independent Software Engineer

Tokyo, Japan

Your engineer on the ground in Japan.

Web apps, workflow automation, and development foundations for companies doing business in Japan — fitted to Japanese-language UIs, domestic services, and the way local teams work. From requirements to operations.

Available for selected projectsEmail me

Selected work

Client Work

  • 1.12026 — PresentFull-stack Engineer

    Feature development for an entertainment DX platform

    As a full-stack engineer at a company running a live-streaming platform and an audio-streaming app, I develop e-commerce, ticketing, and streaming features.

    • Developed e-commerce features
    • Developed ticketing features
    • Developed live-streaming features

    Next.js, Shopify, Google Cloud, PostgreSQL, AWS, Terraform

  • 1.22024 — 2026Full-stack Engineer

    Web development for a medical media company

    Built new web services, migrated existing sites, and set up internal development foundations for a company running medical media.

    • Built a hospital search site and a survey aggregation app
    • Migrated a media site to a new CMS and turned a WordPress site into a static site
    • Built an LP platform that lets marketers publish without engineers
    • Set up a GAS monorepo and internal Claude Code skills

    Next.js, Astro, Nuxt.js, AWS, Terraform, Datadog

  • 1.32023 — PresentDX Engineer

    DX for a sales company

    Embedded as the company’s only engineer, working forward-deployed: I take requests directly from executives and sales staff, set the priorities, and own everything from technology choices to operations — building business apps, automating workflows, and mentoring in-house DX talent.

    • Built a dashboard that automates email delivery
    • Developed a Microsoft Teams bot that supports phone inquiries
    • Built a monorepo that consolidates scattered GAS scripts
    • Mentored a non-engineer into a self-sufficient DX developer

    Next.js, Supabase, Cloudflare, Azure Functions, Terraform, GAS

Products

  • 2.1Liveabstria.app

    Abstria

    A goal app for people whose yearly goals never reach daily action, breaking each one into months, weeks, and days on a mandala chart.

    Next.js, Supabase, Stripe, Cloudflare Workers

  • 2.2Liveapsis-dx.com

    Apsis DX

    A tech media site on AI and DX, publishing technical articles and daily AI news digests.

    Next.js, Three.js, MDX, Cloudflare Workers

  • 2.3Open sourcegithub.com/Cloud-Xero/obsidian-background-slideshow

    Background Slideshow

    An Obsidian plugin that shows a background image slideshow with fade transitions, from vault images, web URLs, or random photos.

    TypeScript, Obsidian API

    community.obsidian.md/plugins/background-slideshow

All work