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Nebula
Real-time collaborative document editor with conflict-free sync and presence.
About — Shinsaku Asada
Shinsaku Asada
Full-Stack Software Engineer
フルスタックエンジニア · Tokyo, Japan 東京
Available for new projects
I design and build fast, beautiful products end-to-end — from pixel-perfect interfaces to resilient backend systems. I care about performance, clean architecture, and the small details that make software feel effortless. Ten years shipping web apps, currently focused on real-time systems, AI-powered products, and developer experience.
Experience10+ years
FocusWeb · Real-time · AI
LocationTokyo 🇯🇵 (remote-friendly)
Languages日本語 · English
Projects
Selected work — a mix of products, tools, and experiments. (sample data — edit in index.html)
Ka
Kanso CMS
Minimalist headless CMS with a GraphQL API and instant preview.
Ha
Hayai Gateway
Edge-deployed API gateway with sub-millisecond routing at the edge.
Mi
Miru Analytics
Live analytics dashboard streaming millions of events with instant charts.
Ts
Tsumugi UI
Accessible design-system component library used across 20+ apps.
So
Sora Bot
AI code-review bot that comments on pull requests with actionable fixes.
Skills & Tools
Frontend
ReactNext.jsVueTypeScriptTailwindFramer MotionThree.js
Backend
Node.jsGoRustPostgreSQLRedisGraphQLgRPC
AI & Cloud
LLMs / RAGAWSGCPDockerKubernetesTerraform
Core strengths
Articles — Engineering Notes
Engineering Notes
Essays on full-stack development, AI, and building for the web.
Arcade
shinsaku@portfolio — zsh
shinsaku@portfolio ~ %
New Message
To:me@shinsaku.pro
Shinsaku_Asada_CV.pdf — Preview
Shinsaku Asada
Senior Full-Stack Software Engineer
I build fast, accessible, delightful web products — end to end.
- 📧 me@shinsaku.pro
- 📍 Tokyo, Japan (remote-friendly)
- 🔗 shinsaku.pro
- 💻 github.com/shinsaku
- in linkedin.com/in/shinsaku
Profile
Full-stack engineer with 10+ years building and scaling web products — from crafted, accessible front-ends to resilient distributed back-ends. I specialize in real-time systems, web performance, and AI-powered features, and I care as much about developer experience and clean architecture as the pixels users see. Comfortable owning a feature from database schema to production rollout, and mentoring the team along the way.
Core Competencies
Languages
TypeScript · JavaScript · Go · Rust · Python · SQL
Frontend
React · Next.js · Vue · Svelte · Tailwind · Three.js · Web Components
Backend
Node.js · Go · GraphQL · gRPC · REST · PostgreSQL · Redis · Kafka
Cloud & DevOps
AWS · GCP · Docker · Kubernetes · Terraform · CI/CD · Observability
AI / ML
LLM apps · RAG · vector search · prompt engineering · evals
Practices
System design · TDD · Accessibility (WCAG) · Performance · Mentoring
Experience
Senior Full-Stack Engineer · [Company Name]
2021 – Present · Tokyo- Led the rebuild of the core web platform (Next.js + Go), cutting p75 load time ~45% and lifting sign-up conversion.
- Architected a real-time collaboration service (WebSocket + CRDT) serving 1M+ monthly users at 99.95% uptime.
- Shipped an in-product AI assistant (RAG over internal docs) that deflected ~30% of support tickets.
- Mentored 6 engineers; established the design system and the front-end testing culture.
TypeScript · Next.js · Go · PostgreSQL · Redis · AWS
Full-Stack Engineer · [Previous Company]
2018 – 2021 · Tokyo- Grew the customer-facing app from prototype to 200k users, owning features across the stack.
- Introduced a component library and CI pipeline, halving release time and cutting UI bugs.
- Migrated a monolith to event-driven services, improving reliability and deploy independence.
React · Node.js · GraphQL · Kubernetes · GCP
Software Engineer · [Earlier Company]
2016 – 2018 · Remote- Delivered full-stack features for a B2B SaaS product and owned the analytics pipeline & dashboards.
- Improved API latency and test coverage across the core services.
Vue · Node.js · PostgreSQL
Junior Developer · [First Company]
2014 – 2016 · Tokyo- Built and maintained client websites and internal tools; learned the craft shipping to production weekly.
Education
B.S. Computer Science · [Your University]
2014Distributed Systems · Algorithms · HCI
Certifications
- AWS Certified Solutions Architect — Professional
- Google Cloud Professional Cloud Architect
- Certified Kubernetes Application Developer (CKAD)
Speaking & Writing
- Speaker, [Tech Conf] 2024 — "Real-time at Scale"
- Author of 15+ engineering essays (see the Articles app)
Languages
- 日本語 — Native
- English — Fluent (business)