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1<link rel="preload" as="image" href="/images/jobboards/expo-jobboard.jpg"/><link rel="preload" as="image" href="/images/jobboards/giftee-jobboard.jpg"/><link rel="preload" as="image" href="/images/jobboards/kakehahi-jobboard.jpg"/><link rel="preload" as="image" href="/images/jobboards/tebiki-jobboard.jpg"/><link rel="preload" as="image" href="/images/jobboards/levtech-jobboard.jpg"/><link rel="preload" as="image" href="/images/jobboards/miidas-jobboard.jpg"/><link rel="preload" as="image" href="/images/jobboards/avita-jobboard.jpg"/><link rel="preload" as="image" href="/images/jobboards/lineyahoo-jobboard.jpg"/><link rel="preload" as="image" href="/images/jobboards/gemcook-jobboard.jpg"/><link rel="preload" as="image" href="/images/jobboards/kubell-jobboard.jpg"/><link rel="preload" as="image" href="/images/jobboards/gaji-labo-jobboard.jpg"/><link rel="preload" as="image" href="/images/jobboards/magicpod-jobboard.jpg"/><link rel="preload" as="image" href="/images/jobboards/chot-jobboard.jpg"/><link rel="preload" as="image" href="/images/jobboards/forcia-jobboard.jpg"/><meta name="generator" content="Waku"/><title>React Tokyo フェス2026</title><meta name="description" content="2026年2月28日 港区浜松町にて開催決定!"/><link rel="icon" type="image/png" href="/images/favicon.png"/><meta property="og:title" content="React Tokyo フェス2026"/><meta property="og:description" content="2026年2月28日 港区浜松町にて開催決定!"/><meta property="og:image" content="https://react-tokyo.vercel.app/images/react-tokyo-logo-opg.png"/><meta property="og:url" content="https://react-tokyo.vercel.app"/><meta name="twitter:card" content="summary_large_image"/><meta name="twitter:site" content="@ReactTokyo"/><meta name="twitter:title" content="React Tokyo フェス2026"/><meta name="twitter:description" content="2026年2月28日 港区浜松町にて開催決定!"/><meta name="twitter:image" content="https://react-tokyo.vercel.app/images/react-tokyo-logo-opg.png"/><meta name="robots" content="max-image-preview:none"/></head><body><div class="overflow-hidden font-[&#x27;Nunito&#x27;]">
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15<header class="relative z-10 flex w-full items-start justify-between p-6 sm:items-center lg:fixed lg:top-0 lg:left-0"><div aria-hidden="true" class="absolute top-0 left-0 h-screen w-screen cursor-default bg-black/80 transition-opacity duration-200 lg:hidden pointer-events-none opacity-0"></div><div class="absolute top-0 left-0 h-full w-full bg-white lg:bg-white/80 lg:backdrop-blur-md"></div><div class="relative flex flex-col gap-2 sm:flex-row sm:items-end sm:gap-4"><a href="/"><img class="h-8" src="/images/react-tokyo-logo-with-title.png" alt="React Tokyo"/></a></div><div class="relative flex items-center gap-8"><nav class="hidden lg:block"><ul class="flex gap-6"><li><a class="text-xl" href="/fes2026">フェス2026</a></li><li><a class="text-xl" href="/about">About</a></li><li><a class="text-xl" href="/blogs">Blogs</a></li><li><a class="text-xl" href="/members">Members</a></li><li><a class="text-xl" href="/sponsors">Sponsors</a></li></ul></nav><a class="flex items-center gap-4 rounded-md bg-[#5865F2] px-4 py-2" href="https://discord.gg/5B9jYpABUy" target="_blank" rel="noreferrer"><img class="h-4" src="/images/discord-logo-white.svg" alt="Discord logo"/><span class="text-white hidden text-sm sm:block">Join Discord Server</span></a><button type="button" aria-label="メニューを開く" aria-expanded="false" class="flex h-6 w-6 flex-col justify-between lg:hidden"><span class="block h-0.5 w-full origin-right rounded bg-black transition-transform duration-200"></span><span class="block h-0.5 w-full rounded bg-black transition-opacity"></span><span class="block h-0.5 w-full origin-right rounded bg-black transition-transform duration-200"></span></button></div><nav class="absolute top-full left-0 w-full bg-white px-6 pb-6 transition-opacity duration-200 lg:hidden invisible opacity-0"><ul><li><a class="block py-4 text-xl font-bold" href="/fes2026">フェス2026</a></li><li><a class="block py-4 text-xl font-bold" href="/about">About</a></li><li><a class="block py-4 text-xl font-bold" href="/blogs">Blogs</a></li><li><a class="block py-4 text-xl font-bold" href="/members">Members</a></li><li><a class="block py-4 text-xl font-bold" href="/sponsors">Sponsors</a></li></ul></nav></header><main class="lg:min-h-svh lg:pb-20"><section class="bg-gray-50 text-[#324c54] lg:pt-20"><section class="edge-box min-h-[800px] w-full md:min-h-[870px]"><div class="pt-20 text-center md:pt-36"><h1 class="text-4xl font-bold text-[#324c54] md:text-6xl">React Tokyo<br class="md:hidden"/>フェス2026</h1><p class="mt-16 text-lg text-gray-600 md:text-3xl">2026年2月28日 港区浜松町にて開催<br/>React Tokyoコミュニティの冬の大縁日</p></div><div class="main-description text-ld m-auto mt-2 w-[calc(100vw-60px)] pt-16 text-gray-600 md:max-w-[60%] md:pt-24"><div class="backdrop-blur-x md:text-md rounded-xl border-1 border-gray-200/50 bg-linear-to-br from-gray-200/70 via-gray-50/50 to-gray-200/50 px-8 py-10 shadow-2xl md:p-16"><p>ご来場頂きありがとうございました!<br/>React Tokyoフェス2026は、2026年2月28日に東京都港区の浜松町で無事開催することができました。</p><p>浜松町の街を舞台に、React好きが一堂に会する&quot;お祭り型&quot;イベント。<br/>発表をただ「聴く」のではなく、会場を回遊しながらまるでお祭りのように朝から晩までワイワイガヤガヤ。<br/>毎月開催のミートアップが、特別な冬の縁日として開催されました。</p><p class="mt-4 md:mt-8">デイフェスでは、ポスター発表・アナログワークショップ・Fishbowl・AIライブコーディングなどさまざまな企画が実施され、ナイトフェスでは参加者同士が飲食を楽しみながら交流できる時間を過ごしました。</p><p class="mt-4 md:mt-8">当日の様子は、運営スタッフによる<a class="text-blue-500 underline" href="https://zenn.dev/react_tokyo/articles/2026-02-28-fest-report" target="_blank" rel="noreferrer">レポート記事</a>を是非ご覧ください!</p></div></div></section><section class="py-16"><div class="mx-auto grid w-[calc(100vw-60px)] grid-cols-1 gap-12 md:w-[calc(100vw-240px)] md:grid-cols-2"><div class="rounded-lg border-1 border-gray-200 bg-gray-50/30 p-8 shadow-lg backdrop-blur-xs"><h3 class="text-xl font-bold text-[#324c54]">ポスターセッション</h3><div class="mt-4"><p class="text-md leading-relaxed text-gray-600">多彩なテーマについて40件のポスターを会場全体に配置します。<br/>ポスター発表者との交流を是非楽しんでください。</p><div class="mt-6 flex flex-row items-center justify-between"><p class="font-bold text-[#005978]">多数のご応募ありがとうございました!</p></div></div></div><div class="rounded-lg border-1 border-gray-200 bg-gray-50/30 p-8 shadow-lg backdrop-blur-xs"><h3 class="text-xl font-bold text-[#324c54]">交流・相談ブース</h3><div class="mt-4"><p class="text-md leading-relaxed text-gray-600">参加者同士で交流できるスペースを設けます。<br/>Reactについてのあれこれを存分に語り合ってください。<br/>皆さんが存分に交流できるような&quot;仕掛け&quot;をコミュニティスタッフ内で鋭意検討中!</p></div></div><div class="rounded-lg border-1 border-gray-200 bg-gray-50/30 p-8 shadow-lg backdrop-blur-xs"><h3 class="text-xl font-bold text-[#324c54]">スポンサーブース</h3><div class="mt-4"><p class="text-md leading-relaxed text-gray-600">フェスを支えてくださるスポンサーブースを設けます。<br/>Reactのプロダクト開発について直接質問できるチャンス!</p><div class="mt-6 flex flex-row items-center justify-between"><p class="font-bold text-[#005978]">多数のご応募ありがとうございました!</p></div></div></div><div class="rounded-lg border-1 border-gray-200 bg-gray-50/30 p-8 shadow-lg backdrop-blur-xs"><h3 class="text-xl font-bold text-[#324c54]">ライブコーディングセッション</h3><div class="mt-4"><p class="text-md leading-relaxed text-gray-600">他に例を見ない、お祭りとライブコーディング。<br/>あの有名OSS作者の開発風景を見られる!?飛び入り参加!?一緒にコーディング!?バイブコーディングレース!?<br/>一体どんな内容になるかは当日までのお楽しみ・・・?</p></div></div></div></section><section><div class="flex h-64 items-center justify-center bg-[url(/images/fes2026/particles.svg)] bg-repeat"><img src="/images/fes2026/fes-logo.png" alt="fes2026 logo" class="w-1/4 md:w-1/8"/></div></section><section id="poster-session" class="bg-[#292929] bg-cover bg-center py-16 text-gray-200"><div class="mx-auto w-[calc(100vw-60px)] md:w-[calc(100vw-240px)]"><h3 class="text-2xl font-bold">ポスターセッション発表者</h3><p class="text-md mt-4 leading-relaxed">React Tokyoフェス2026では、会場全体を彩る<span class="font-bold">ポスターセッション発表者(40件)</span>が決定しました!</p><div class="mt-8 grid grid-cols-1 gap-4 sm:grid-cols-2 md:grid-cols-3 lg:grid-cols-4"><button type="button" class="flex w-full cursor-pointer flex-col items-center gap-3 rounded-lg bg-white p-5 text-gray-700 shadow-md transition hover:shadow-lg"><img class="h-16 w-16 rounded-full object-cover" src="/images/fes2026/poster-presenter/yz_iori.png" alt="IORI"/><h4 class="text-center text-sm font-bold break-keep">IORI</h4><p class="text-center text-xs leading-relaxed font-semibold text-gray-800">
15RSCの仕組みをNext.jsとTanStack Startの比較から理解したい</p><div class="mt-1 text-xs text-gray-400">詳細を見る</div></button><button type="button" class="flex w-full cursor-pointer flex-col items-center gap-3 rounded-lg bg-white p-5 text-gray-700 shadow-md transition hover:shadow-lg"><img class="h-16 w-16 rounded-full object-cover" src="/images/fes2026/poster-presenter/tmkst.png" alt="さとう"/><h4 class="text-center text-sm font-bold break-keep">さとう</h4><p class="text-center text-xs leading-relaxed font-semibold text-gray-800">チームでReactを書くための“ちょうどいい共通化”を考える</p><div class="mt-1 text-xs text-gray-400">詳細を見る</div></button><button type="button" class="flex w-full cursor-pointer flex-col items-center gap-3 rounded-lg bg-white p-5 text-gray-700 shadow-md transition hover:shadow-lg"><img class="h-16 w-16 rounded-full object-cover" src="/images/fes2026/poster-presenter/bicstone.png" alt="おおいし (bicstone)"/><h4 class="text-center text-sm font-bold break-keep">おおいし (bicstone)</h4><p class="text-center text-xs leading-relaxed font-semibold text-gray-800">TypeScriptのmoduleオプションを改めて整理する (TS 5.9)</p><div class="mt-1 text-xs text-gray-400">詳細を見る</div></button><button type="button" class="flex w-full cursor-pointer flex-col items-center gap-3 rounded-lg bg-white p-5 text-gray-700 shadow-md transition hover:shadow-lg"><img class="h-16 w-16 rounded-full object-cover" src="/images/fes2026/poster-presenter/rimltempest.png" alt="高橋大貴"/><h4 class="text-center text-sm font-bold break-keep">高橋大貴</h4><p class="text-center text-xs leading-relaxed font-semibold text-gray-800">ReactにおけるデータUI改善×AIによる開発生産性の改善</p><div class="mt-1 text-xs text-gray-400">詳細を見る</div></button><button type="button" class="flex w-full cursor-pointer flex-col items-center gap-3 rounded-lg bg-white p-5 text-gray-700 shadow-md transition hover:shadow-lg"><img class="h-16 w-16 rounded-full object-cover" src="/images/fes2026/poster-presenter/seri111111111.png" alt="芹澤和也"/><h4 class="text-center text-sm font-bold break-keep">芹澤和也</h4><p class="text-center text-xs leading-relaxed font-semibold text-gray-800">Figmaで定義したデザイントークンを、そのままTailwindで使える仕組みを作った話</p><div class="mt-1 text-xs text-gray-400">詳細を見る</div></button><button type="button" class="flex w-full cursor-pointer flex-col items-center gap-3 rounded-lg bg-white p-5 text-gray-700 shadow-md transition hover:shadow-lg"><img class="h-16 w-16 rounded-full object-cover" src="/images/fes2026/poster-presenter/tonegawa07.png" alt="ふくすけ"/><h4 class="text-center text-sm font-bold break-keep">ふくすけ</h4><p class="text-center text-xs leading-relaxed font-semibold text-gray-800">OpenAPI TypeScriptで実現する型安全なスキーマ駆動開発</p><div class="mt-1 text-xs text-gray-400">詳細を見る</div></button><button type="button" class="flex w-full cursor-pointer flex-col items-center gap-3 rounded-lg bg-white p-5 text-gray-700 shadow-md transition hover:shadow-lg"><img class="h-16 w-16 rounded-full object-cover" src="/images/fes2026/poster-presenter/calloc134.png" alt="かろっく"/><h4 class="text-center text-sm font-bold break-keep">かろっく</h4><p class="text-center text-xs leading-relaxed font-semibold text-gray-800">目で見てサッと理解する! Reactの思想と内部実装入門</p><div class="mt-1 text-xs text-gray-400">詳細を見る</div></button><button type="button" class="flex w-full cursor-pointer flex-col items-center gap-3 rounded-lg bg-white p-5 text-gray-700 shadow-md transition hover:shadow-lg"><img class="h-16 w-16 rounded-full object-cover" src="/images/fes2026/poster-presenter/.mrtry.png" alt="React Native Japan"/><h4 class="text-center text-sm font-bold break-keep">React Native Japan</h4><p class="text-center text-xs leading-relaxed font-semibold text-gray-800">いらっしゃい!React Native!</p><div class="mt-1 text-xs text-gray-400">詳細を見る</div></button><button type="button" class="flex w-full cursor-pointer flex-col items-center gap-3 rounded-lg bg-white p-5 text-gray-700 shadow-md transition hover:shadow-lg"><img class="h-16 w-16 rounded-full object-cover" src="/images/fes2026/poster-presenter/itojum.png" alt="いとじゅん"/><h4 class="text-center text-sm font-bold break-keep">いとじゅん</h4><p class="text-center text-xs leading-relaxed font-semibold text-gray-800">Mastra ScorerでAIエージェントの評価をしてみた!!</p><div class="mt-1 text-xs text-gray-400">詳細を見る</div></button><button type="button" class="flex w-full cursor-pointer flex-col items-center gap-3 rounded-lg bg-white p-5 text-gray-700 shadow-md transition hover:shadow-lg"><img class="h-16 w-16 rounded-full object-cover" src="/images/fes2026/poster-presenter/baba1001.png" alt="馬場一樹"/><h4 class="text-center text-sm font-bold break-keep">馬場一樹</h4><p class="text-center text-xs leading-relaxed font-semibold text-gray-800">
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