Tokyo-based product designer and engineer working across product design, UI/UX, AI products, and engineering — from design to production.https://mactokyo.com/en-ushttps://mactokyo.com/journal/rebuilding-this-site-with-astro/https://mactokyo.com/journal/rebuilding-this-site-with-astro/Why I moved my portfolio off Adobe Portfolio onto Astro, Tailwind, and a Notion CMS — the architecture and the trade-offs.Sun, 02 Aug 2026 00:00:00 GMTastronotionmetawebhttps://mactokyo.com/journal/notes-on-designing-ai-products/https://mactokyo.com/journal/notes-on-designing-ai-products/What changes when the product's core behavior is probabilistic: designing for uncertainty, latency, and trust in AI features.Mon, 01 Jun 2026 00:00:00 GMTaiproduct-designessayhttps://mactokyo.com/journal/a-brand-new-vacuum-robot/https://mactokyo.com/journal/a-brand-new-vacuum-robot/Product research on the robot-vacuum category: mapping the competitive landscape and where a new entrant could still differentiate.Sun, 01 May 2022 00:00:00 GMTproduct-researchhardwareconsumerhttps://mactokyo.com/journal/airchain-business-proposal/https://mactokyo.com/journal/airchain-business-proposal/A business proposal exploring blockchain-based logistics tracking — what the technology genuinely solves and where it doesn't.Mon, 01 Nov 2021 00:00:00 GMTblockchainlogisticsbusinesshttps://mactokyo.com/journal/design-research-of-jd-health/https://mactokyo.com/journal/design-research-of-jd-health/UX research on JD Health's telemedicine flows — appointment, consultation, and pharmacy — benchmarked against patient anxiety at each step.Sun, 01 Aug 2021 00:00:00 GMThealthtechux-researchchinahttps://mactokyo.com/journal/electric-car-research-proposal-for-byd/https://mactokyo.com/journal/electric-car-research-proposal-for-byd/A research proposal for BYD's EV lineup: charging anxiety, in-car software, and the digital touchpoints that shape ownership.Tue, 01 Jun 2021 00:00:00 GMTautomotiveevresearchhttps://mactokyo.com/journal/eventflow/https://mactokyo.com/journal/eventflow/Concept and research for an event-management product: from discovery and ticketing to day-of check-in.Thu, 01 Apr 2021 00:00:00 GMTeventsproduct-concepthttps://mactokyo.com/journal/first-blockchain-assignment/https://mactokyo.com/journal/first-blockchain-assignment/Notes from my first hands-on blockchain assignment: smart contracts, gas, and what 'trustless' means in practice.Mon, 01 Feb 2021 00:00:00 GMTblockchainethereumlearninghttps://mactokyo.com/journal/future-marketing-strategy/https://mactokyo.com/journal/future-marketing-strategy/How privacy regulation and AI-generated content reshape marketing strategy — and what durable advantage looks like after both.Sun, 01 Nov 2020 00:00:00 GMTmarketingstrategyaihttps://mactokyo.com/journal/nike-vs-lululemon-marketing-strategy/https://mactokyo.com/journal/nike-vs-lululemon-marketing-strategy/A comparative analysis of two athletic brands with opposite strategies: mass aspiration versus community-led growth.Tue, 01 Sep 2020 00:00:00 GMTmarketingbrandinganalysishttps://mactokyo.com/journal/research-report-of-bilibili-following-network/https://mactokyo.com/journal/research-report-of-bilibili-following-network/A network analysis of Bilibili's follow graph: how content communities cluster and how creators bridge between them.Mon, 01 Jun 2020 00:00:00 GMTnetwork-analysissocialdatahttps://mactokyo.com/journal/snack-token/https://mactokyo.com/journal/snack-token/A token-design exercise: modeling incentives for a snack-brand loyalty token without the usual crypto wishful thinking.Wed, 01 Apr 2020 00:00:00 GMTtokenomicsloyaltyconcepthttps://mactokyo.com/journal/the-hong-kong-jockey-club/https://mactokyo.com/journal/the-hong-kong-jockey-club/Service-design research on the Hong Kong Jockey Club's digital experience across racing, membership, and charity.Sat, 01 Feb 2020 00:00:00 GMTservice-designhong-konghttps://mactokyo.com/journal/trend-micro-authenticator-design-walkthrough/https://mactokyo.com/journal/trend-micro-authenticator-design-walkthrough/A screen-by-screen design walkthrough of Trend Micro's authenticator app: enrollment, daily use, and recovery flows.Sun, 01 Dec 2019 00:00:00 GMTsecuritywalkthroughmobile