diff --git a/web/Dockerfile b/web/Dockerfile
new file mode 100644
index 0000000..7a08584
--- /dev/null
+++ b/web/Dockerfile
@@ -0,0 +1,13 @@
+FROM node:18-alpine AS web-build
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci --silent
+COPY . .
+RUN npm run build
+
+FROM node:18-alpine AS web-runtime
+WORKDIR /app
+ENV NODE_ENV=production
+COPY --from=web-build /app/ .
+EXPOSE 3000
+CMD ["npm", "run", "start"]
diff --git a/web/components/Editor.tsx b/web/components/Editor.tsx
new file mode 100644
index 0000000..688a757
--- /dev/null
+++ b/web/components/Editor.tsx
@@ -0,0 +1,24 @@
+import dynamic from 'next/dynamic'
+import React from 'react'
+
+const Monaco = dynamic(() => import('@monaco-editor/react'), { ssr: false })
+
+type Props = {
+  value: string
+  language?: string
+  onChange?: (v: string | undefined) => void
+  height?: string | number
+}
+
+export default function Editor({ value, language = 'yaml', onChange, height = '60vh' }: Props) {
+  return (
+    // @ts-ignore - dynamic import types
+    <Monaco
+      value={value}
+      language={language}
+      height={height}
+      onChange={onChange}
+      options={{ automaticLayout: true, tabSize: 2 }}
+    />
+  )
+}
diff --git a/web/lib/ws.ts b/web/lib/ws.ts
new file mode 100644
index 0000000..7944c7f
--- /dev/null
+++ b/web/lib/ws.ts
@@ -0,0 +1,15 @@
+export function connectWS(room: string, onMessage: (m: string) => void) {
+  const backend = process.env.NEXT_PUBLIC_BACKEND_URL || process.env.BACKEND_URL || 'http://localhost:8080'
+  const url = backend.replace(/^http/, 'ws') + `/ws?room=${encodeURIComponent(room)}`
+  try {
+    const ws = new WebSocket(url)
+    ws.addEventListener('message', (ev) => onMessage(ev.data))
+    ws.addEventListener('open', () => onMessage('[ws] connected'))
+    ws.addEventListener('close', () => onMessage('[ws] disconnected'))
+    ws.addEventListener('error', () => onMessage('[ws] error'))
+    return ws
+  } catch (err) {
+    onMessage('[ws] connection failed')
+    return null
+  }
+}
diff --git a/web/next.config.js b/web/next.config.js
new file mode 100644
index 0000000..a843cbe
--- /dev/null
+++ b/web/next.config.js
@@ -0,0 +1,6 @@
+/** @type {import('next').NextConfig} */
+const nextConfig = {
+  reactStrictMode: true,
+}
+
+module.exports = nextConfig
diff --git a/web/package.json b/web/package.json
new file mode 100644
index 0000000..c7d107c
--- /dev/null
+++ b/web/package.json
@@ -0,0 +1,19 @@
+{
+  "name": "nexus-web",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start -p $PORT"
+  },
+  "dependencies": {
+    "next": "14.0.0",
+    "react": "18.2.0",
+    "react-dom": "18.2.0",
+    "@monaco-editor/react": "^5.0.1"
+  },
+  "devDependencies": {
+    "typescript": "5.5.0"
+  }
+}
diff --git a/web/pages/_app.tsx b/web/pages/_app.tsx
new file mode 100644
index 0000000..c055f25
--- /dev/null
+++ b/web/pages/_app.tsx
@@ -0,0 +1,6 @@
+import '../styles/globals.css'
+import type { AppProps } from 'next/app'
+
+export default function App({ Component, pageProps }: AppProps) {
+  return <Component {...pageProps} />
+}
diff --git a/web/pages/collections/[name].tsx b/web/pages/collections/[name].tsx
new file mode 100644
index 0000000..7637ed3
--- /dev/null
+++ b/web/pages/collections/[name].tsx
@@ -0,0 +1,83 @@
+import React, { useEffect, useState } from 'react'
+import { useRouter } from 'next/router'
+import { connectWS } from '../../lib/ws'
+import Editor from '../../components/Editor'
+
+export default function CollectionPage() {
+  const router = useRouter()
+  const name = Array.isArray(router.query.name) ? router.query.name[0] : router.query.name || ''
+
+  const [content, setContent] = useState('')
+  const [status, setStatus] = useState<string | null>(null)
+  const [wsLog, setWsLog] = useState<string[]>([])
+  const [ws, setWs] = useState<WebSocket | null>(null)
+
+  useEffect(() => {
+    if (!name) return
+    const backend = process.env.NEXT_PUBLIC_BACKEND_URL || process.env.BACKEND_URL || 'http://localhost:8080'
+    fetch(`${backend}/api/collections/get?name=${encodeURIComponent(name)}`)
+      .then((r) => r.json())
+      .then((data) => {
+        setContent(JSON.stringify(data, null, 2))
+      })
+      .catch((e) => setStatus(String(e)))
+
+    const socket = connectWS(name, (m) => setWsLog((s) => [...s, m]))
+    setWs(socket)
+    return () => {
+      try {
+        socket?.close()
+      } catch {}
+    }
+  }, [name])
+
+  function save() {
+    const backend = process.env.NEXT_PUBLIC_BACKEND_URL || process.env.BACKEND_URL || 'http://localhost:8080'
+    fetch(`${backend}/api/collections/save`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ name, content }),
+    })
+      .then((r) => r.json())
+      .then(() => setStatus('saved'))
+      .catch((e) => setStatus(String(e)))
+  }
+
+  function run() {
+    const backend = process.env.NEXT_PUBLIC_BACKEND_URL || process.env.BACKEND_URL || 'http://localhost:8080'
+    setStatus('running')
+    fetch(`${backend}/api/run`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ name }),
+    })
+      .then((r) => r.json())
+      .then((data) => setStatus(JSON.stringify(data)))
+      .catch((e) => setStatus(String(e)))
+  }
+
+  return (
+    <main style={{ padding: 24 }}>
+      <h1>Collection: {name}</h1>
+      <div style={{ marginBottom: 8 }}>
+        <button onClick={save} style={{ marginRight: 8 }}>Save</button>
+        <button onClick={run}>Run</button>
+      </div>
+
+      <Editor value={content} onChange={(v) => setContent(v ?? '')} height="60vh" />
+
+      <div style={{ marginTop: 12 }}>
+        <strong>Status:</strong> {status}
+      </div>
+
+      <div style={{ marginTop: 12 }}>
+        <strong>WS log:</strong>
+        <div style={{ maxHeight: 200, overflow: 'auto', border: '1px solid #eee', padding: 8 }}>
+          {wsLog.map((l, i) => (
+            <div key={i}>{l}</div>
+          ))}
+        </div>
+      </div>
+    </main>
+  )
+}
diff --git a/web/pages/collections/index.tsx b/web/pages/collections/index.tsx
new file mode 100644
index 0000000..7d02ac7
--- /dev/null
+++ b/web/pages/collections/index.tsx
@@ -0,0 +1,31 @@
+import React from 'react'
+import Link from 'next/link'
+import type { GetServerSideProps } from 'next'
+
+type Props = { collections: string[] }
+
+export default function Collections({ collections }: Props) {
+  return (
+    <main style={{ padding: 24 }}>
+      <h1>Collections</h1>
+      <ul>
+        {collections.map((c) => (
+          <li key={c}>
+            <Link href={`/collections/${encodeURIComponent(c)}`}>{c}</Link>
+          </li>
+        ))}
+      </ul>
+    </main>
+  )
+}
+
+export const getServerSideProps: GetServerSideProps<Props> = async () => {
+  const backend = process.env.BACKEND_URL || 'http://localhost:8080'
+  try {
+    const res = await fetch(`${backend}/api/collections`)
+    const data = await res.json()
+    return { props: { collections: data.collections || [] } }
+  } catch (err) {
+    return { props: { collections: [] } }
+  }
+}
diff --git a/web/pages/index.tsx b/web/pages/index.tsx
new file mode 100644
index 0000000..0faaef3
--- /dev/null
+++ b/web/pages/index.tsx
@@ -0,0 +1,37 @@
+import React from 'react'
+import type { GetServerSideProps } from 'next'
+
+type Props = {
+  collections: string[]
+  error?: string
+}
+
+export default function Home({ collections, error }: Props) {
+  if (error) return <div>Error: {error}</div>
+
+  return (
+    <main style={{ padding: 24, fontFamily: 'Inter, system-ui' }}>
+      <h1>Nexus — Collections</h1>
+      <p>Collections stored in repository</p>
+      <ul>
+        {collections.map((c) => (
+          <li key={c}>{c}</li>
+        ))}
+      </ul>
+    </main>
+  )
+}
+
+export const getServerSideProps: GetServerSideProps<Props> = async (context) => {
+  const backend = process.env.BACKEND_URL || 'http://localhost:8080'
+  try {
+    const res = await fetch(`${backend}/api/collections`)
+    if (!res.ok) {
+      return { props: { collections: [], error: `backend responded ${res.status}` } }
+    }
+    const data = await res.json()
+    return { props: { collections: data.collections || [] } }
+  } catch (err: any) {
+    return { props: { collections: [], error: err.message } }
+  }
+}
diff --git a/web/styles/globals.css b/web/styles/globals.css
new file mode 100644
index 0000000..e997c4b
--- /dev/null
+++ b/web/styles/globals.css
@@ -0,0 +1,7 @@
+html, body, #__next {
+  height: 100%;
+}
+body {
+  margin: 0;
+  font-family: Inter, system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial;
+}
diff --git a/web/tsconfig.json b/web/tsconfig.json
new file mode 100644
index 0000000..b657a4a
--- /dev/null
+++ b/web/tsconfig.json
@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "lib": ["dom", "dom.iterable", "esnext"],
+    "allowJs": true,
+    "skipLibCheck": true,
+    "strict": true,
+    "forceConsistentCasingInFileNames": true,
+    "noEmit": true,
+    "esModuleInterop": true,
+    "module": "esnext",
+    "moduleResolution": "node",
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "jsx": "preserve"
+  },
+  "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx"],
+  "exclude": ["node_modules"]
+}