伊藤 ショーン (Sean Carino Ito)
Native Mobile & Full-Stack Software Engineer
Personal Information
| Full Name | Sean Carino Ito (伊藤 ショーン) |
| Date of Birth | 1995 |
| Location | Shibuya, Tokyo, Japan |
| Nationality | Japanese citizen |
| seanito93@gmail.com | |
| Website | xybersean.com |
Professional Summary
Full-stack software engineer based in Tokyo with deep experience across native mobile development (iOS and Android), modern web frameworks, cloud infrastructure, and AI/ML systems. I build production-grade applications from the ground up -- from low-level platform APIs and native UI frameworks to backend services, CI/CD pipelines, and cloud deployments.
My primary focus is native mobile app development. On the Apple side, I work directly with Swift, SwiftUI, AppKit, AVFoundation, ARKit, Vision, and Metal. On Android, I build with Kotlin, Jetpack Compose, Material3, Firebase, and the Android SDK. As a full-stack developer, I own every layer of the product -- frontend, backend, infrastructure, and deployment.
Work Experience
XYBERSEAN -- Tokyo, Japan
- Founded and lead a software studio focused on building digital products with precision and purpose for clients and internal ventures
- Architected and deployed the company website on Cloudflare Pages with Workers-based edge functions, CSP hardening, i18n (EN/JP), and SPA routing for the internal portal
- Built the Always-On Council -- a multi-agent AI orchestration platform running across Mac mini M4, ThinkPad X250, and Arch iMac, coordinating Claude, Gemini, Mistral, and local Ollama instances
- Developed Project Lente -- a professional-grade native macOS camera app using iPhone Pro as primary sensor via AVFoundation, ARKit, Vision, and Metal
- Designed and implemented Project Roots, a family tree editor with free-canvas drag UI for genealogy visualization
- Manage a team of co-founders covering engineering, design, finance, and game development
Canonical / Ubuntu Community -- Remote
- Contributed to UbuntuGNOME as an official developer, working on desktop integration and packaging
- Served as a StartUbuntu Ambassador, promoting Ubuntu adoption and supporting new contributors
Technical Skills
| iOS / macOS | Swift, SwiftUI, UIKit, AppKit, AVFoundation, ARKit, Vision, Metal, Core Data, Xcode, Instruments |
| Android | Kotlin, Jetpack Compose, Material3, Android SDK, CameraX, Firebase, RevenueCat, LINE Messaging API |
| Web Frontend | Next.js 16, React 19, TypeScript, Tailwind v4, shadcn/ui, Vanilla JS, HTML/CSS, Vite |
| Backend | Cloudflare Workers, Vercel, Firebase Cloud Functions, Node.js, Python, REST APIs, WebSocket |
| AI / ML | Ollama, Mistral, Claude, OpenAI, Gemini, DeepSeek, ElevenLabs, OpenRouter, LoRA fine-tuning, multi-agent orchestration, Wandb |
| Cloud | Cloudflare Pages + Workers, GCP Vertex AI, Oracle Cloud (ARM Ampere A1), Firebase, Vercel |
| Linux | Arch Linux, Ubuntu, Bash, systemd, Docker, Barrier, tmux, SSH, SMB |
| Game / Sim | Godot 4.6, GDScript, GDShader |
| Design | Figma, design-to-code handoff, component systems, responsive layouts, accessibility |
| Languages | Swift, Kotlin, TypeScript, JavaScript, Python, Go, GDScript, PHP, Bash |
Selected Projects
doorcam Kotlin / Android
Ring-style door camera from an old Android phone. CameraX for continuous capture, on-device motion detection, ring-buffer pre-roll recording, scrcpy live feed. Designed to run 24/7 as a headless background service.
LiquidTerm Swift / SwiftUI / AppKit
Native macOS terminal emulator with Liquid Glass aesthetic. Full POSIX PTY layer, multi-window pane splitting, custom text rendering, terminal escape sequence parsing. Demonstrates deep macOS platform knowledge.
haku-health Swift (SwiftUI) + React (Vite)
Parallel iOS and web clients from a shared Figma design system. Native SwiftUI app with platform-appropriate navigation and gestures alongside a React + Vite web client on Vercel. Handoff assets versioned in-repo.
BirdStone Kotlin / Android / Firebase
Android class enlistment system for educational institutions without digital enrollment tooling. Kotlin + Android SDK + Firebase for real-time data, authentication, and cloud functions. CS thesis project, designed, developed, and deployed to a real institution (2020-2022).
Mars-Protocol Godot 4.6 / GDScript
Voice-activated open-world Mars exploration simulation using real USGS Mars 2020 terrain data. Agentic AI Mission Commander manages colony operations, Starship logistics, and in-situ resource utilization.
MistralMario Python / Mistral
Mistral-powered agent experiments from the Mistral AI Hackathon -- Tokyo Edition (Feb 2026). Tool use patterns, multi-turn reasoning chains, and creative agent behavior. Reference implementation for Mistral agent systems.
finetuning-mistral-x Python
End-to-end Mistral model fine-tuning pipeline. Dataset preparation, training scripts with configurable hyperparameters, LoRA adapter training, and published adapter weights.
ThinkPadReconnect Python (stdlib only)
macOS dock utility that monitors and auto-reconnects Barrier, SSH tunnel, and SMB to a remote ThinkPad. Pure Python, no dependencies. Handles network drops, sleep/wake cycles, and service restarts silently.
projectflow-website Vanilla JS / CSS
Glassmorphic local-first Kanban PM tool from Mistral Worldwide Hacks. Zero dependencies, no build step, no framework. Runs from a single HTML file with localStorage persistence.
Education
Kalayaan College, Philippines
- Thesis: BirdStone -- Android-based class enlistment system (Kotlin + Firebase), designed and deployed for a real institution
- Extended timeline reflects concurrent professional work and relocation to Tokyo
Languages
| English | Native |
| Tagalog | Native |
| Japanese | Business level |
Hackathons & Events
- Built MistralMario (agent experiments with tool use and multi-turn reasoning) and finetuning-mistral-x (LoRA fine-tuning pipeline with published adapters)
- Built projectflow-website -- a zero-dependency glassmorphic Kanban PM tool with offline-first localStorage persistence
Affiliations
- Member, Computer Professionals' Union (CPU), Root Access Committee -- 2022 to present
- Former UbuntuGNOME Contributing Developer & StartUbuntu Ambassador -- 2013 to 2014
Open to senior developer roles and selective contract work -- Tokyo or remote.