diff --git a/backend/config/index.js b/backend/config/index.js
index bbd6904..629eea8 100644
--- a/backend/config/index.js
+++ b/backend/config/index.js
@@ -1,10 +1,5 @@
-import dotenv from 'dotenv';
-
-dotenv.config({ path: '.secrets' });
-
 const config = {
   port: process.env.PORT || 3001,
-  openaiApiKey: process.env.OPENAI_API_KEY,
 };
 
 export default config;
diff --git a/backend/routes/notes.routes.js b/backend/routes/notes.routes.js
index 659b989..13e8247 100644
--- a/backend/routes/notes.routes.js
+++ b/backend/routes/notes.routes.js
@@ -2,6 +2,7 @@ import { Router } from 'express';
 import { readFile } from 'fs/promises';
 import { fileURLToPath } from 'url';
 import { dirname, join } from 'path';
+import { clusterNotes } from '../services/clustering.service.js';
 
 const router = Router();
 
@@ -9,14 +10,28 @@ const __filename = fileURLToPath(import.meta.url);
 const __dirname = dirname(__filename);
 const DATA_PATH = join(__dirname, '..', 'data', 'notes.json');
 
+const loadNotes = async () => {
+  const raw = await readFile(DATA_PATH, 'utf-8');
+  return JSON.parse(raw);
+};
+
 router.get('/', async (req, res) => {
   try {
-    const raw = await readFile(DATA_PATH, 'utf-8');
-    const notes = JSON.parse(raw);
+    const notes = await loadNotes();
     res.json(notes);
   } catch (err) {
     res.status(500).json({ error: 'Failed to load notes' });
   }
 });
 
+router.post('/cluster', async (req, res) => {
+  try {
+    const notes = await loadNotes();
+    const clusters = await clusterNotes(notes);
+    res.json(clusters);
+  } catch (err) {
+    res.status(500).json({ error: 'Clustering failed' });
+  }
+});
+
 export default router;
diff --git a/backend/services/clustering.service.js b/backend/services/clustering.service.js
index 30db22f..40ffd17 100644
--- a/backend/services/clustering.service.js
+++ b/backend/services/clustering.service.js
@@ -1,19 +1,46 @@
 import Anthropic from "@anthropic-ai/sdk";
-import anthropicApiKey from "../.secrets";
+import { anthropicApiKey } from "../.secrets.js";
 
 const client = new Anthropic({
-  apiKey: anthropicApiKey 
+  apiKey: anthropicApiKey,
 });
 
-const prompt = `You are a helpful assistant that analyzes notes for semantic similarity. Each note is a json object with the 
-various attributes. For clustering purposes, the relvant attribute is "text". Analze the text attributes of the notes and return a json object with the following structure: {{$notes}}`;
+const buildPrompt = (notes) => {
+  const notesJson = JSON.stringify(notes, null, 2);
+
+  return `You are an expert at analyzing text for semantic similarity and thematic patterns.
+
+Below is a JSON array of sticky notes. Each note has an "id" and a "text" field. Analyze the "text" field of every note and group them into meaningful thematic clusters.
+
+Return ONLY a valid JSON array with this exact structure — no markdown, no explanation, no extra text:
+
+[
+  {
+    "label": "Short descriptive theme name",
+    "noteIds": ["note_001", "note_002"]
+  }
+]
+
+Rules:
+- Every note must appear in exactly one cluster
+- Each cluster must have a concise, descriptive label
+- Group by semantic meaning, not by keywords
+- Aim for the most natural number of groups given the data
+
+Here are the notes:
+
+${notesJson}`;
+};
 
 export const clusterNotes = async (notes) => {
   const response = await client.messages.create({
-  model: "claude-opus-4-6",
+    model: "claude-sonnet-4-20250514",
+    max_tokens: 4096,
     messages: [
-      { role: "user", content: `${prompt}`}
-    ]
+      { role: "user", content: buildPrompt(notes) },
+    ],
   });
-  return response.content[0].text;
-};
\ No newline at end of file
+
+  const raw = response.content[0].text;
+  return JSON.parse(raw);
+};
diff --git a/frontend/index.html b/frontend/index.html
index fc3a2ba..de74e7a 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -4,7 +4,7 @@
     <meta charset="UTF-8" />
     <link rel="icon" type="image/svg+xml" href="/vite.svg" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>my-react-app</title>
+    <title>Resias</title>
   </head>
   <body>
     <div id="root"></div>
diff --git a/frontend/src/App.css b/frontend/src/App.css
index f5d69d5..902778b 100644
--- a/frontend/src/App.css
+++ b/frontend/src/App.css
@@ -4,8 +4,3 @@
   padding: 2rem;
   text-align: center;
 }
-
-.card {
-  padding: 2em;
-}
-
diff --git a/frontend/src/api/api.tsx b/frontend/src/api/api.tsx
index d9da4cc..a123466 100644
--- a/frontend/src/api/api.tsx
+++ b/frontend/src/api/api.tsx
@@ -1,17 +1,35 @@
-import { useQuery } from '@tanstack/react-query';
-import type { Sticky } from '../types/types';
+import { useQuery, useMutation } from '@tanstack/react-query';
+import type { Sticky, Cluster } from '../types/types';
+
+const API_BASE = 'http://localhost:3001/v1/notes';
 
 const fetchStickies = async (): Promise<Sticky[]> => {
-  const response = await fetch('http://localhost:3001/v1/notes');
+  const response = await fetch(API_BASE);
   if (!response.ok) {
     throw new Error('Failed to fetch stickies');
   }
   return response.json();
 };
 
+const fetchClusters = async (): Promise<Cluster[]> => {
+  const response = await fetch(`${API_BASE}/cluster`, {
+    method: 'POST',
+  });
+  if (!response.ok) {
+    throw new Error('Failed to cluster stickies');
+  }
+  return response.json();
+};
+
 export const useGetStickies = () => {
   return useQuery<Sticky[]>({
     queryKey: ['stickies'],
     queryFn: fetchStickies,
   });
 };
+
+export const useClusterStickies = () => {
+  return useMutation<Cluster[]>({
+    mutationFn: fetchClusters,
+  });
+};
diff --git a/frontend/src/components/button.tsx b/frontend/src/components/button.tsx
index 0e52e55..13691ab 100644
--- a/frontend/src/components/button.tsx
+++ b/frontend/src/components/button.tsx
@@ -1,11 +1,14 @@
-import { useState } from 'react';
-
-const Button = () => {
-    return (
-        <button>
-            Click me
-        </button>
-    );
+type ClusterButtonProps = {
+  onClick: () => void;
+  isLoading: boolean;
 };
 
-export default Button;
\ No newline at end of file
+const ClusterButton = ({ onClick, isLoading }: ClusterButtonProps) => {
+  return (
+    <button onClick={onClick} disabled={isLoading}>
+      {isLoading ? 'Clustering...' : 'Run Clustering'}
+    </button>
+  );
+};
+
+export default ClusterButton;
diff --git a/frontend/src/components/stickies.css b/frontend/src/components/stickies.css
index 20f30d6..a6d0094 100644
--- a/frontend/src/components/stickies.css
+++ b/frontend/src/components/stickies.css
@@ -5,3 +5,22 @@
   justify-content: center;
   padding: 24px;
 }
+
+.clusters-container {
+  display: flex;
+  flex-direction: column;
+  gap: 32px;
+  padding: 24px 0;
+}
+
+.cluster-group {
+  border: 1px solid rgba(255, 255, 255, 0.1);
+  border-radius: 8px;
+  padding: 16px;
+}
+
+.cluster-label {
+  margin: 0 0 16px 0;
+  font-size: 1.2em;
+  font-weight: 600;
+}
diff --git a/frontend/src/components/stickies.tsx b/frontend/src/components/stickies.tsx
index 5c7bed4..383dd41 100644
--- a/frontend/src/components/stickies.tsx
+++ b/frontend/src/components/stickies.tsx
@@ -1,18 +1,57 @@
-import { useGetStickies } from '../api/api';
+import { useGetStickies, useClusterStickies } from '../api/api';
+import type { Sticky as StickyType } from '../types/types';
 import Sticky from './sticky';
+import ClusterButton from './button';
 import './stickies.css';
 
 const Stickies = () => {
-  const { data, isLoading, error } = useGetStickies();
+  const { data: stickies, isLoading, error } = useGetStickies();
+  const { mutate: cluster, data: clusters, isPending } = useClusterStickies();
 
   if (isLoading) return <div>Loading...</div>;
   if (error) return <div>Error: {error.message}</div>;
 
+  const handleCluster = () => {
+    cluster();
+  };
+
+  const buildStickyMap = (): Map<string, StickyType> => {
+    const map = new Map<string, StickyType>();
+    stickies?.forEach((s) => map.set(s.id, s));
+    return map;
+  };
+
+  if (clusters) {
+    const stickyMap = buildStickyMap();
+
+    return (
+      <div>
+        <ClusterButton onClick={handleCluster} isLoading={isPending} />
+        <div className="clusters-container">
+          {clusters.map((group) => (
+            <div key={group.label} className="cluster-group">
+              <h3 className="cluster-label">{group.label}</h3>
+              <div className="stickies-grid">
+                {group.noteIds.map((id) => {
+                  const sticky = stickyMap.get(id);
+                  return sticky ? <Sticky key={sticky.id} sticky={sticky} /> : null;
+                })}
+              </div>
+            </div>
+          ))}
+        </div>
+      </div>
+    );
+  }
+
   return (
-    <div className="stickies-grid">
-      {data?.map((sticky) => (
-        <Sticky key={sticky.id} sticky={sticky} />
-      ))}
+    <div>
+      <ClusterButton onClick={handleCluster} isLoading={isPending} />
+      <div className="stickies-grid">
+        {stickies?.map((sticky) => (
+          <Sticky key={sticky.id} sticky={sticky} />
+        ))}
+      </div>
     </div>
   );
 };
diff --git a/frontend/src/index.css b/frontend/src/index.css
index 08a3ac9..c68032a 100644
--- a/frontend/src/index.css
+++ b/frontend/src/index.css
@@ -2,30 +2,17 @@
   font-family: system-ui, Avenir, Helvetica, Arial, sans-serif;
   line-height: 1.5;
   font-weight: 400;
-
   color-scheme: light dark;
   color: rgba(255, 255, 255, 0.87);
   background-color: #242424;
-
   font-synthesis: none;
   text-rendering: optimizeLegibility;
   -webkit-font-smoothing: antialiased;
   -moz-osx-font-smoothing: grayscale;
 }
 
-a {
-  font-weight: 500;
-  color: #646cff;
-  text-decoration: inherit;
-}
-a:hover {
-  color: #535bf2;
-}
-
 body {
   margin: 0;
-  display: flex;
-  place-items: center;
   min-width: 320px;
   min-height: 100vh;
 }
@@ -46,22 +33,26 @@ button {
   cursor: pointer;
   transition: border-color 0.25s;
 }
+
 button:hover {
   border-color: #646cff;
 }
+
 button:focus,
 button:focus-visible {
   outline: 4px auto -webkit-focus-ring-color;
 }
 
+button:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
 @media (prefers-color-scheme: light) {
   :root {
     color: #213547;
     background-color: #ffffff;
   }
-  a:hover {
-    color: #747bff;
-  }
   button {
     background-color: #f9f9f9;
   }
diff --git a/frontend/src/types/types.tsx b/frontend/src/types/types.tsx
index dab29dd..b4cf319 100644
--- a/frontend/src/types/types.tsx
+++ b/frontend/src/types/types.tsx
@@ -6,3 +6,8 @@ export type Sticky = {
   author: string;
   color: string;
 };
+
+export type Cluster = {
+  label: string;
+  noteIds: string[];
+};