● systems online — full-stack mode
Full-Stack Product Engineer building cinematic SaaS experiences.
I build across React, TypeScript, NestJS, AWS, databases, and AI workflows — turning complex product systems into fast, beautiful, production-ready experiences.
Currently building enterprise SaaS workflows at Josys. Open to Japan/global full-stack engineering roles.
- Full-stack SaaS engineering
- Micro-frontends and design systems
- Backend APIs and cloud architecture
- AI-enabled workflow experiments
Current
Software Engineer at Josys
Focus
Full-stack SaaS, MFE, design systems
Backend
NestJS, Node.js, API design
Cloud
AWS, serverless, storage, CDN, queues, caching
Systems
Architecture, data flows, trade-offs
AI
Assistant workflows, automation, product intelligence
Selected Work
I do not just ship screens. I ship systems.
Selected work across interface, backend, cloud, and AI.
Audit Logs Micro-Frontend
Searchable and filterable audit experience for enterprise activity visibility.
Brahma Design System
Shared UI component and token system for consistent SaaS product delivery.
Dynamic Configuration Service
Database-backed configuration workflow for dynamic product forms and rules.
Admin Consent Assignment Workflow
Permission assignment workflow with clear states, validation, and safe submission.
Policy Anomaly Workflow
Workflow UI and system model for surfacing, tracking, and remediating policy anomalies.
AI Portfolio Assistant
AI assistant that helps recruiters explore experience, projects, and role fit.
System Thinking
I think in systems, not just screens.
A good interface is only one layer of the product. I care about the contract behind it, the latency users feel, the data model that supports it, and the operational path that keeps it reliable.
User Interface
React, TypeScript, accessible product surfaces with motion and polish.
Skills by Layer
Architecture is the invisible UX.
Skills organized by system layer — not random tags.
Interface Engineering
Polished, accessible, high-performance product interfaces.
→ Audit Logs MFE, e-commerce storefront, portfolio UI systems
Frontend Architecture
Reusable product surfaces, micro-frontends, design systems, testing, and state boundaries.
→ Brahma Design System, SaaS platform modernization
Backend and APIs
Service APIs, validation, workflow logic, and contracts that make complex UIs reliable.
→ Configuration services, internal workflow tools, AI assistant API
Data and Storage
Database-backed product behavior, read/write patterns, and performance-aware data access.
→ Dynamic configuration architecture and product workflow data models
Cloud and Infrastructure
Deployment-aware engineering using cloud primitives, storage, CDN, serverless, queues, and caching.
→ SaaS workflows, configuration runtime, portfolio deployment
AI Product Workflows
AI-powered user experiences, assistant flows, prompt rules, and workflow automation concepts.
→ AI Portfolio Assistant, Dataflow recommendations
Experience
Built for teams that care about speed, quality, and craft.
From frontend craft to full-stack ownership.
Software Engineer — Josys
Dec 2024 – Present
Building and modernizing enterprise SaaS workflows across frontend architecture, design systems, internal tools, and full-stack product surfaces.
Frontend Developer — Life Of Young
Jan 2022 – Jun 2024
Built high-performance e-commerce and marketing experiences with Next.js, React, SEO, admin workflows, and performance optimization.
Product Designer and Developer — Freelance
2020 – 2021
Designed dashboards, landing pages, and e-commerce interfaces from Figma to code.
Creative Engineering
Creative Engineering Lab
A playground for 3D interfaces, AI experiments, motion systems, and product interaction ideas.
3D Skill Galaxy
LiveInteractive constellation where each star represents a skill layer — drag to rotate, scroll to zoom through career phases.
Interactive Architecture Visualizer
PrototypeClick through system layers — UI, API, service, queue, database, cache — to explore full-stack experience.
AI Portfolio Assistant
In DevelopmentChat assistant that answers questions about experience, projects, and role fit using curated portfolio knowledge.
Looking for a full-stack engineer who can ship product, architecture, and design together?
Open to Japan-based, remote, relocation, and global product engineering roles.