Hi, I'm Daisuke Adachi 👋

I ship complete products solo — native iOS, native Android, and the Rails backend behind them.
20+ years writing software · AI-driven development with Claude Code & the Claude Agent SDK

Open to full-time & contract roles — get in touch ↓

I'm a full-stack mobile engineer who designs, ships, and operates iOS (Swift / SwiftUI / SwiftData), Android (Kotlin / Jetpack Compose), and Ruby on Rails — all three layers — as a single developer. I've been shipping to the App Store and Google Play for over a decade. Based in Japan 🇯🇵, working in Japanese and English.

Since 2025 my focus has been AI-driven development with Claude Code and the Claude Agent SDK.

🚀 Recent work

• Printora — iOS app that auto-detects people in photos and arranges them into A4-optimized print layouts. Swift / SwiftUI / SwiftData / Vision Framework · RevenueCat freemium · 491 unit tests (Swift Testing) · on the App Store since Dec 2025.
• CommitJobs — a job board where every participant writes code (GitHub login is the only sign-in), and one account toggles between hiring and looking — no non-technical middleman. Rails 8.1 / Hotwire / TailwindCSS v4 · Solid Queue/Cache/Cable (no Redis) · Stripe one-off listing fee (no subscriptions) · Kamal 2 → Hetzner · kept deliberately solo-maintainable.
• My Texas Method — Strength-training program generator based on the Texas Method. Swift 6 / Swift Charts / SwiftData + an Apple Watch companion via WatchConnectivity · 973 unit tests · #23 on Product Hunt (74 upvotes).
• NativeAppTemplate — open-source, production-ready app-template suite plus an AI generator:
  • iOS (SwiftUI, 98★) and Android (Jetpack Compose, 16★) — native templates with user authentication.
  • API — Rails 8.1 backend (Solid Queue / Cable / Cache, no Redis). Listed on Awesome Rails.
  • agent — Claude Agent SDK CLI that turns a natural-language spec into a coherent three-platform SaaS (Rails API + SwiftUI iOS + Jetpack Compose Android) with structural, runtime, and vision-based validation. Built at Cerebral Valley's "Built with Opus" hackathon.

Contract highlight: an XCFramework that reads Japanese Residence Cards (在留カード) over NFC, based on the Ministry of Justice public spec, validated with real test cards at the Immigration Services Agency · 96% unit-test coverage.

📫 Get in touch

I'm actively open to new opportunities — full-time or contract. I prefer environments where I can use Claude Code as my coding assistant.

• 📧 Email: [email protected]
• 💼 LinkedIn: daisuke-adachi
• 𝕏 X: @AdachiDaisuke

Thanks for stopping by!