diff --git a/.gitignore b/.gitignore
new file mode 100644
index 000000000..bef6c532f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,148 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional stylelint cache
+.stylelintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variable files
+.env
+.env.*
+!.env.example
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+.output
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# vuepress v2.x temp directory
+.temp
+
+# Sveltekit cache directory
+.svelte-kit/
+
+# vitepress build output
+**/.vitepress/dist
+
+# vitepress cache directory
+**/.vitepress/cache
+
+# Docusaurus cache and generated files
+.docusaurus
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# Firebase cache directory
+.firebase/
+
+# TernJS port file
+.tern-port
+
+# Stores Visual Studio Code versions used for testing Visual Studio Code extensions
+.vscode-test
+
+# pnpm
+.pnpm-store
+
+# yarn v3
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions
+
+# Vite files
+vite.config.js.timestamp-*
+vite.config.ts.timestamp-*
+.vite/
+
+CORS_ORIGINS
+
+#VS Code
+.vscode
\ No newline at end of file
diff --git a/chat-app/backend/.dockerignore b/chat-app/backend/.dockerignore
new file mode 100644
index 000000000..6718f89d0
--- /dev/null
+++ b/chat-app/backend/.dockerignore
@@ -0,0 +1,5 @@
+.env
+.env.*
+.git
+node_modules
+npm-debug.log
\ No newline at end of file
diff --git a/chat-app/backend/Dockerfile b/chat-app/backend/Dockerfile
new file mode 100644
index 000000000..cf03226b3
--- /dev/null
+++ b/chat-app/backend/Dockerfile
@@ -0,0 +1,7 @@
+FROM node:26.7.0-alpine
+ENV NODE_ENV=production
+WORKDIR /app
+COPY . .
+RUN npm ci --omit=dev
+USER node
+ENTRYPOINT ["node", "pollingApp.js"]
\ No newline at end of file
diff --git a/chat-app/backend/EventStream.js b/chat-app/backend/EventStream.js
new file mode 100644
index 000000000..4b7012bba
--- /dev/null
+++ b/chat-app/backend/EventStream.js
@@ -0,0 +1,125 @@
+class EventStream {
+    constructor() {
+        this.events = [];
+        this.sequence = 0;
+
+        // waiters are HTTP polling requests
+        this.waiters = new Set();
+
+        // subscribers are websocket connections.
+        this.subscribers = new Set();
+    }
+
+    /**
+     * Adds an event to the event stream. {sequnce, type, timestamp, data}.
+     *
+     * @param {"message.liked" | "message.disliked" | "message.created"} type - The type of event (e.g. "like").
+     * @param {*} data - The message that was added or changed, and the changed fields.
+     * @returns The event object, with a sequence number
+     */
+    append(type, data) {
+        const event = {
+            sequence: ++this.sequence,
+            type,
+            timestamp: Date.now(),
+            data,
+        };
+
+        this.events.push(event);
+        this.notifyWaiters();
+        this.notifySubscribers();
+        return event;
+    }
+
+    /**
+     *
+     * @param {number} sequence - returns events with sequence number > given sequence number.
+     * @returns list of events.
+     */
+    getAfter(sequence) {
+        return this.events.filter((event) => event.sequence > sequence);
+    }
+
+    // websocket subscriber
+    subscribe(callback) {
+        const subscriber = {
+            cursor: null,
+            callback: callback,
+        };
+        this.subscribers.add(subscriber);
+        return subscriber;
+    }
+
+    unsubscribe(subscriber) {
+        this.subscribers.delete(subscriber);
+    }
+
+    // WebSocket subscribers
+    notifySubscribers() {
+        for (const subscriber of this.subscribers) {
+            if (subscriber.cursor === null) {
+                continue;
+            }
+
+            const events = this.getAfter(subscriber.cursor);
+
+            if (events.length === 0) {
+                continue;
+            }
+
+            try {
+                subscriber.callback(events);
+            } catch (err) {
+                console.error("subscriber failed", err);
+            }
+        }
+    }
+
+    /**
+     * Polling (HTTP) connections waiting for new events
+     * If no new events are available, keeps connection open for specified time.
+     * @param {number} after - returns events after this sequence number.
+     * @param {*} timeout - How long to wait for a new event before closing the connection.
+     * @returns A promise which resolves with a list of new events or empty list
+     * if timer expires.
+     */
+    waitForEvents(after, timeout = 30_000) {
+        const existing = this.getAfter(after);
+
+        if (existing.length > 0) {
+            return Promise.resolve(existing);
+        }
+
+        return new Promise((resolve) => {
+            const waiter = {
+                after,
+                resolve,
+                timer: setTimeout(() => {
+                    this.waiters.delete(waiter);
+                    resolve([]);
+                }, timeout),
+            };
+
+            this.waiters.add(waiter);
+        });
+    }
+
+    /**
+     * Sends new events for waiting HTTP requests, if there are any events to send.
+     */
+    notifyWaiters() {
+        for (const waiter of this.waiters) {
+            const events = this.getAfter(waiter.after);
+
+            if (events.length === 0) {
+                continue;
+            }
+
+            clearTimeout(waiter.timer);
+            this.waiters.delete(waiter);
+            waiter.resolve(events);
+        }
+    }
+}
+
+export { EventStream };
diff --git a/chat-app/backend/Message.js b/chat-app/backend/Message.js
new file mode 100644
index 000000000..a2f98877d
--- /dev/null
+++ b/chat-app/backend/Message.js
@@ -0,0 +1,17 @@
+export class Message {
+    static #nextId = 0;
+
+    /**
+     *
+     * @param {string} username the message sender
+     * @param {*} msg_body text content of the message
+     */
+    constructor(username, msg_body, likes = 0, dislikes = 0) {
+        this.id = Message.#nextId++;
+        this.username = username;
+        this.msg_body = msg_body;
+        this.createdAt = new Date();
+        this.likes = likes;
+        this.dislikes = dislikes;
+    }
+}
diff --git a/chat-app/backend/errorClasses.js b/chat-app/backend/errorClasses.js
new file mode 100644
index 000000000..4db8e4662
--- /dev/null
+++ b/chat-app/backend/errorClasses.js
@@ -0,0 +1,15 @@
+class ValidationError extends Error {
+    constructor(message) {
+        super(message);
+        this.name = "ValidationError";
+    }
+}
+
+class NotFoundError extends Error {
+    constructor(message) {
+        super(message);
+        this.name = "NotFoundError";
+    }
+}
+
+export { ValidationError, NotFoundError };
diff --git a/chat-app/backend/expressApp.js b/chat-app/backend/expressApp.js
new file mode 100644
index 000000000..a765f9070
--- /dev/null
+++ b/chat-app/backend/expressApp.js
@@ -0,0 +1,80 @@
+import express from "express";
+import cors from "cors";
+
+import { addMessage, getMessages, addReaction, eventStream } from "./model.js";
+import { NotFoundError, ValidationError } from "./errorClasses.js";
+const app = express();
+
+app.use(cors());
+app.use(express.json());
+const PORT = process.env.PORT || 3000;
+
+app.get("/messages", (req, res) => {
+    res.json(getMessages());
+});
+
+app.post("/messages", (req, res) => {
+    const message = addMessage(req.body.username, req.body.msg_body);
+
+    res.status(201).json(message);
+});
+
+app.post("/reactions", (req, res) => {
+    const id = toInteger(req.body.id);
+    if (id === null) {
+        throw new ValidationError("id must be a non-negative integer");
+    }
+    res.json(addReaction(id, req.body.action));
+});
+
+/**
+ * Event streaming endpoint. Sends a list of events (new message, like, dislike) and
+ * a cursor to the most recently sent event.
+ * if request contains "after" query, sends events with sequence number higher than this.
+ * if wait is supplied, does short polling, otherwise long polling that waits for the specified
+ * amount of time in seconds.
+ */
+app.get("/events", async (req, res) => {
+    const after = toInteger(req.query.after) ?? 0;
+    const wait = toInteger(req.query.wait) ?? 0;
+
+    if (wait === 0) {
+        const events = eventStream.getAfter(after);
+        const cursor =
+            events.length > 0 ? events[events.length - 1].sequence : after;
+
+        return res.json({ cursor, events });
+    }
+
+    const events = await eventStream.waitForEvents(after, wait * 1000);
+    const cursor =
+        events.length > 0 ? events[events.length - 1].sequence : after;
+
+    res.json({ cursor, events });
+});
+
+app.get("/snapshot", (req, res) => {
+    res.json({ cursor: eventStream.sequence, messages: getMessages() });
+});
+
+app.use((err, req, res, next) => {
+    if (err instanceof ValidationError) {
+        return res.status(400).json({ error: err.message });
+    }
+
+    if (err instanceof NotFoundError) {
+        return res.status(404).json({ error: err.message });
+    }
+
+    return res.status(500).json({ error: "Internal server error" });
+});
+
+function toInteger(value) {
+    if (typeof value !== "string" || !/^\d+$/.test(value)) {
+        return null;
+    }
+    const n = Number(value);
+    return Number.isSafeInteger(n) ? n : null;
+}
+
+export { app };
diff --git a/chat-app/backend/model.js b/chat-app/backend/model.js
new file mode 100644
index 000000000..f8b7d2068
--- /dev/null
+++ b/chat-app/backend/model.js
@@ -0,0 +1,136 @@
+import { NotFoundError, ValidationError } from "./errorClasses.js";
+import { Message } from "./Message.js";
+import { EventStream } from "./EventStream.js";
+
+const messages = [];
+const eventStream = new EventStream();
+
+const MAX_USERNAME = 100;
+const MAX_BODY = 500;
+
+const dummyData = [];
+dummyData.push({ username: "user1", msg_body: "abcd" });
+dummyData.push({ username: "user2", msg_body: "xyz" });
+dummyData.push({ username: "user3", msg_body: "lmno" });
+dummyData.push({ username: "user4", msg_body: "pqrst" });
+dummyData.push({ username: "user4", msg_body: "aaaargh" });
+
+dummyData.forEach(({ username, msg_body }) => {
+    addMessage(username, msg_body);
+});
+
+/**
+ * Creates a message, stores it, and returns it.
+ * The id and timestamp are generated here; callers only supply content.
+ *
+
+ * @param {string} username - usrname of message creator. 1-100 characters.
+ * @param {string} input.msg_body - Body of the message. 1-500 characters.
+ * @returns {Message} The stored message.
+ * @throws {ValidationError} If username or body is missing, not a string, or out of range.
+ */
+function addMessage(username, msg_body) {
+    if (!username) {
+        throw new ValidationError("username is required");
+    }
+
+    if (!msg_body) {
+        throw new ValidationError("msg_body is required");
+    }
+
+    if (typeof username !== "string" || typeof msg_body !== "string") {
+        throw new ValidationError("username and body must be strings");
+    }
+
+    username = username?.trim();
+    msg_body = msg_body?.trim();
+
+    if (!username || username.length > MAX_USERNAME) {
+        throw new ValidationError(
+            `username must be 1-${MAX_USERNAME} characters`,
+        );
+    }
+    if (!msg_body || msg_body.length > MAX_BODY) {
+        throw new ValidationError(`body must be 1-${MAX_BODY} characters`);
+    }
+
+    const message = new Message(username, msg_body);
+
+    messages.push(message);
+    eventStream.append("message.created", message);
+    return message;
+}
+
+/**
+ * Returns all messages in system.
+ *
+ * @returns {Message[]} An array of Message objects.
+ */
+function getMessages() {
+    return messages;
+}
+
+/**
+ * Return the message with the provided ID.
+ *
+ * @param {number} id - ID of message to return.
+ * @returns {Message} The requested message.
+ * @throws {ValidationError}  If id is invalid.
+ * @throws {NotFoundError} If no messages exists with given ID.
+ */
+function getMessage(id) {
+    validateId(id);
+
+    const message = messages.find((message) => message.id === id);
+    if (!message) {
+        throw new NotFoundError("could not find message");
+    }
+    return message;
+}
+
+function validateId(id) {
+    if (!Number.isInteger(id) || id < 0) {
+        throw new ValidationError("id must be a non-negative number");
+    }
+}
+
+const REACTIONS = {
+    like: { reactionField: "likes", event: "message.liked" },
+    dislike: { reactionField: "dislikes", event: "message.disliked" },
+};
+
+/**
+ * Adds a reaction (like or dislike) to a message.
+ *
+ * @param {number} messageId ID of the message to react to.
+ * @param {"like" | "dislike"} action The reaction to add.
+ * @returns {{ id: number, likes?: number, dislikes?: number }}
+ *   The message id and its updated count for the given reaction.
+ * @throws {ValidationError} if `action` is not a known reaction.
+ * @throws {NotFoundError} if no message exists with the given ID.
+ */
+function addReaction(messageId, action) {
+    if (typeof action !== "string" || !Object.hasOwn(REACTIONS, action)) {
+        throw new ValidationError(
+            `Unknown reaction type: ${String(action).slice(0, 50)}`,
+        );
+    }
+
+    const { reactionField, event } = REACTIONS[action];
+
+    const message = getMessage(messageId);
+    message[reactionField] = (message[reactionField] ?? 0) + 1;
+
+    const data = { id: message.id, [reactionField]: message[reactionField] };
+    eventStream.append(event, data);
+    return data;
+}
+
+export {
+    addMessage,
+    getMessage,
+    getMessages,
+    addReaction,
+    eventStream,
+    REACTIONS,
+};
diff --git a/chat-app/backend/package-lock.json b/chat-app/backend/package-lock.json
new file mode 100644
index 000000000..b1f818814
--- /dev/null
+++ b/chat-app/backend/package-lock.json
@@ -0,0 +1,933 @@
+{
+    "name": "chat-app",
+    "version": "1.0.0",
+    "lockfileVersion": 3,
+    "requires": true,
+    "packages": {
+        "": {
+            "name": "chat-app",
+            "version": "1.0.0",
+            "license": "ISC",
+            "dependencies": {
+                "cors": "^2.8.6",
+                "dotenv": "^18.0.1",
+                "express": "^5.2.1"
+            }
+        },
+        "node_modules/accepts": {
+            "version": "2.0.0",
+            "resolved": "https://registry.npmjs.org/accepts/-/accepts-2.0.0.tgz",
+            "integrity": "sha512-5cvg6CtKwfgdmVqY1WIiXKc3Q1bkRqGLi+2W/6ao+6Y7gu/RCwRuAhGEzh5B4KlszSuTLgZYuqFqo5bImjNKng==",
+            "license": "MIT",
+            "dependencies": {
+                "mime-types": "^3.0.0",
+                "negotiator": "^1.0.0"
+            },
+            "engines": {
+                "node": ">= 0.6"
+            }
+        },
+        "node_modules/body-parser": {
+            "version": "2.3.0",
+            "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-2.3.0.tgz",
+            "integrity": "sha512-2cGmJupaNgg+QUwVLAucDuWuoMZ6EX9iHDRswZ5lsNYEmwPaRknMPCLZz07yTzVq/83p4o/wzbDZbBrTvGGTIw==",
+            "license": "MIT",
+            "dependencies": {
+                "bytes": "^3.1.2",
+                "content-type": "^2.0.0",
+                "debug": "^4.4.3",
+                "http-errors": "^2.0.1",
+                "iconv-lite": "^0.7.2",
+                "on-finished": "^2.4.1",
+                "qs": "^6.15.2",
+                "raw-body": "^3.0.2",
+                "type-is": "^2.1.0"
+            },
+            "engines": {
+                "node": ">=18"
+            },
+            "funding": {
+                "type": "opencollective",
+                "url": "https://opencollective.com/express"
+            }
+        },
+        "node_modules/body-parser/node_modules/content-type": {
+            "version": "2.1.0",
+            "resolved": "https://registry.npmjs.org/content-type/-/content-type-2.1.0.tgz",
+            "integrity": "sha512-mj7UPXE0jaqaOsukNZRUEfEi2AcL7C/vwmwcHV0O97eO1E1pxBZuyjlZrx5seTaNBg1U6+o35wpa35Qfcc+7ag==",
+            "license": "MIT",
+            "engines": {
+                "node": ">=18"
+            },
+            "funding": {
+                "type": "opencollective",
+                "url": "https://opencollective.com/express"
+            }
+        },
+        "node_modules/bytes": {
+            "version": "3.1.2",
+            "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.2.tgz",
+            "integrity": "sha512-/Nf7TyzTx6S3yRJObOAV7956r8cr2+Oj8AC5dt8wSP3BQAoeX58NoHyCU8P8zGkNXStjTSi6fzO6F0pBdcYbEg==",
+            "license": "MIT",
+            "engines": {
+                "node": ">= 0.8"
+            }
+        },
+        "node_modules/call-bind-apply-helpers": {
+            "version": "1.0.2",
+            "resolved": "https://registry.npmjs.org/call-bind-apply-helpers/-/call-bind-apply-helpers-1.0.2.tgz",
+            "integrity": "sha512-Sp1ablJ0ivDkSzjcaJdxEunN5/XvksFJ2sMBFfq6x0ryhQV/2b/KwFe21cMpmHtPOSij8K99/wSfoEuTObmuMQ==",
+            "license": "MIT",
+            "dependencies": {
+                "es-errors": "^1.3.0",
+                "function-bind": "^1.1.2"
+            },
+            "engines": {
+                "node": ">= 0.4"
+            }
+        },
+        "node_modules/call-bound": {
+            "version": "1.0.4",
+            "resolved": "https://registry.npmjs.org/call-bound/-/call-bound-1.0.4.tgz",
+            "integrity": "sha512-+ys997U96po4Kx/ABpBCqhA9EuxJaQWDQg7295H4hBphv3IZg0boBKuwYpt4YXp6MZ5AmZQnU/tyMTlRpaSejg==",
+            "license": "MIT",
+            "dependencies": {
+                "call-bind-apply-helpers": "^1.0.2",
+                "get-intrinsic": "^1.3.0"
+            },
+            "engines": {
+                "node": ">= 0.4"
+            },
+            "funding": {
+                "url": "https://github.com/sponsors/ljharb"
+            }
+        },
+        "node_modules/content-disposition": {
+            "version": "1.1.0",
+            "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-1.1.0.tgz",
+            "integrity": "sha512-5jRCH9Z/+DRP7rkvY83B+yGIGX96OYdJmzngqnw2SBSxqCFPd0w2km3s5iawpGX8krnwSGmF0FW5Nhr0Hfai3g==",
+            "license": "MIT",
+            "engines": {
+                "node": ">=18"
+            },
+            "funding": {
+                "type": "opencollective",
+                "url": "https://opencollective.com/express"
+            }
+        },
+        "node_modules/content-type": {
+            "version": "1.0.5",
+            "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.5.tgz",
+            "integrity": "sha512-nTjqfcBFEipKdXCv4YDQWCfmcLZKm81ldF0pAopTvyrFGVbcR6P/VAAd5G7N+0tTr8QqiU0tFadD6FK4NtJwOA==",
+            "license": "MIT",
+            "engines": {
+                "node": ">= 0.6"
+            }
+        },
+        "node_modules/cookie": {
+            "version": "0.7.2",
+            "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.7.2.tgz",
+            "integrity": "sha512-yki5XnKuf750l50uGTllt6kKILY4nQ1eNIQatoXEByZ5dWgnKqbnqmTrBE5B4N7lrMJKQ2ytWMiTO2o0v6Ew/w==",
+            "license": "MIT",
+            "engines": {
+                "node": ">= 0.6"
+            }
+        },
+        "node_modules/cookie-signature": {
+            "version": "1.2.2",
+            "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.2.2.tgz",
+            "integrity": "sha512-D76uU73ulSXrD1UXF4KE2TMxVVwhsnCgfAyTg9k8P6KGZjlXKrOLe4dJQKI3Bxi5wjesZoFXJWElNWBjPZMbhg==",
+            "license": "MIT",
+            "engines": {
+                "node": ">=6.6.0"
+            }
+        },
+        "node_modules/cors": {
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+            "license": "ISC"
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+    }
+}
diff --git a/chat-app/backend/package.json b/chat-app/backend/package.json
new file mode 100644
index 000000000..558bbd2e8
--- /dev/null
+++ b/chat-app/backend/package.json
@@ -0,0 +1,20 @@
+{
+    "name": "chat-app",
+    "version": "1.0.0",
+    "description": "https://sdc.codeyourfuture.io/decomposition/sprints/2/prep/",
+    "main": "app.js",
+    "scripts": {
+        "dev": "node --watch app.js",
+        "start": "node pollingApp.js",
+        "test": "echo \"Error: no test specified\" && exit 1"
+    },
+    "keywords": [],
+    "author": "",
+    "license": "ISC",
+    "type": "module",
+    "dependencies": {
+        "cors": "^2.8.6",
+        "dotenv": "^18.0.1",
+        "express": "^5.2.1"
+    }
+}
diff --git a/chat-app/backend/pollingApp.js b/chat-app/backend/pollingApp.js
new file mode 100644
index 000000000..35cbc338e
--- /dev/null
+++ b/chat-app/backend/pollingApp.js
@@ -0,0 +1,10 @@
+import dotenv from "dotenv";
+dotenv.config({ path: `.env.${process.env.NODE_ENV || "development"}` });
+
+import { app } from "./expressApp.js";
+
+const PORT = process.env.PORT || 3000;
+
+app.listen(PORT, () => {
+    console.log(`Polling app listening on port ${PORT}`);
+});
diff --git a/chat-app/backend/websocketApp.js b/chat-app/backend/websocketApp.js
new file mode 100644
index 000000000..8ff8f9867
--- /dev/null
+++ b/chat-app/backend/websocketApp.js
@@ -0,0 +1,41 @@
+import dotenv from "dotenv";
+dotenv.config({ path: `.env.${process.env.NODE_ENV || "development"}` });
+
+import { server as WebSocketServer } from "websocket";
+import { eventStream } from "./model.js";
+import http from "http";
+
+const PORT = process.env.PORT || 3000;
+
+import { app } from "./expressApp.js";
+
+// express app handles http get requests for snapshots
+// post requests to create new messages or reactions
+// WebSocket used only for event streaming to the client
+// and acknowledgement from the client when event received.
+const server = http.createServer(app);
+
+const webSocketServer = new WebSocketServer({
+    httpServer: server,
+});
+
+webSocketServer.on("request", (request) => {
+    const connection = request.accept(null, request.origin);
+
+    const subscriber = eventStream.subscribe((events) => {
+        connection.sendUTF(JSON.stringify(events));
+    });
+
+    connection.on("message", (message) => {
+        const data = JSON.parse(message.utf8Data);
+        if (data.type === "ack") {
+            subscriber.cursor = data.cursor;
+        }
+    });
+
+    connection.on("close", () => eventStream.unsubscribe(subscriber));
+});
+
+server.listen(PORT, () => {
+    console.log(`chat app server listening on port ${PORT}`);
+});
diff --git a/chat-app/frontend/HttpError.js b/chat-app/frontend/HttpError.js
new file mode 100644
index 000000000..f17c9473a
--- /dev/null
+++ b/chat-app/frontend/HttpError.js
@@ -0,0 +1,9 @@
+class HttpError extends Error {
+    constructor(status, message) {
+        super(message);
+        this.name = "HttpError";
+        this.status = status;
+    }
+}
+
+export { HttpError };
diff --git a/chat-app/frontend/common.js b/chat-app/frontend/common.js
new file mode 100644
index 000000000..d960d13de
--- /dev/null
+++ b/chat-app/frontend/common.js
@@ -0,0 +1,185 @@
+import { HttpError } from "./HttpError.js";
+
+const chatStreamDiv = document.querySelector(".chat-stream");
+const form = document.querySelector(".chat-input");
+
+const BACKEND_URL =
+    "https://z4k2yzxetkpevkwf6zy9ea37.trainees.hosting.cyf.academy";
+// const BACKEND_URL = "http://localhost:3000";
+
+const WS_URL = "ws://localhost:3000";
+const state = {
+    messages: new Map(),
+    eventCursor: 0,
+};
+
+form.addEventListener("submit", (event) => {
+    event.preventDefault();
+    sendMessage();
+    form.reset();
+});
+
+/**
+ * Send a message and append it to the messages DOM.
+ * Does not update the messages state or cursor.
+ * That is done by the event polling.
+ */
+async function sendMessage() {
+    const username = document.getElementById("username-input").value;
+    const msg_body = document.getElementById("message-input").value;
+
+    try {
+        await chatRequest(`${BACKEND_URL}/messages`, {
+            method: "POST",
+            headers: { "Content-Type": "application/json" },
+            body: JSON.stringify({ username, msg_body }),
+        });
+    } catch (e) {
+        alert(e.message);
+    }
+}
+
+function saveEventData(event) {
+    const message = event.data;
+    if (event.type === "message.created") {
+        state.messages.set(message.id, message);
+    }
+    if (event.type === "message.liked") {
+        if (message) {
+            const stateMsg = state.messages.get(message.id);
+            stateMsg.likes = message.likes;
+        }
+    }
+    if (event.type === "message.disliked") {
+        if (message) {
+            const stateMsg = state.messages.get(message.id);
+            stateMsg.dislikes = message.dislikes;
+        }
+    }
+    state.eventCursor = event.sequence;
+    return state.eventCursor;
+}
+
+// Render all messages.
+function render() {
+    const messages = state.messages.values();
+    const messageEntries = messages.map((message) => {
+        return createChatEntry(message);
+    });
+    chatStreamDiv.replaceChildren(...messageEntries);
+}
+
+/**
+ * Even listener to handle clicks of like/dislike buttons.
+ */
+chatStreamDiv.addEventListener("click", async (event) => {
+    const button = event.target.closest("[data-action]");
+    if (!button) return;
+    const { messageId, action } = button.dataset;
+
+    try {
+        await reactToMessage(messageId, action);
+    } catch (e) {
+        alert(e.message);
+    }
+});
+
+/**
+ * Sends the reaction type and the id of the message reacted to.
+ *
+ * @param {string} messageId message to like or dislike
+ * @param {string} action type of reaction (like or dislike initially)
+ * @returns {id, likes | dislikes} Returns the id and the value of the reaction field.
+ */
+async function reactToMessage(messageId, action) {
+    return await chatRequest(`${BACKEND_URL}/reactions`, {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ id: messageId, action: action }),
+    });
+}
+
+async function chatRequest(url, options) {
+    const response = await fetch(url, options);
+
+    let data;
+
+    try {
+        data = await response.json();
+    } catch {
+        data = null;
+    }
+
+    if (!response.ok) {
+        throw new HttpError(
+            response.status,
+            data?.error ?? "Something went wrong",
+        );
+    }
+    return data;
+}
+
+// Create a message card to display in DOM.
+function createChatEntry({
+    id,
+    username,
+    msg_body,
+    createdAt,
+    likes,
+    dislikes,
+}) {
+    const card = document.createElement("div");
+    card.className = "message-card";
+
+    const usernameElem = document.createElement("p");
+    usernameElem.textContent = `from: ${username}`;
+
+    const bodyElem = document.createElement("p");
+    bodyElem.textContent = `message: ${msg_body}`;
+
+    const timestampElem = document.createElement("p");
+    timestampElem.textContent = `sent: ${createdAt}`;
+
+    const likeBtn = document.createElement("button");
+    likeBtn.textContent = `likes: ${likes}`;
+    likeBtn.dataset.messageId = id;
+    likeBtn.dataset.action = "like";
+
+    const dislikeBtn = document.createElement("button");
+    dislikeBtn.textContent = `dislikes: ${dislikes}`;
+    dislikeBtn.dataset.messageId = id;
+    dislikeBtn.dataset.action = "dislike";
+
+    const btnContainer = document.createElement("div");
+    btnContainer.className = "msg-btn-container";
+    btnContainer.append(likeBtn, dislikeBtn);
+    card.appendChild(usernameElem);
+    card.appendChild(bodyElem);
+    card.appendChild(timestampElem);
+    card.appendChild(btnContainer);
+
+    return card;
+}
+
+/**
+ * Syncronises local state with server
+ * @returns the current client cursor
+ */
+async function geteventSnapshot() {
+    const response = await chatRequest(`${BACKEND_URL}/snapshot`);
+    const messages = response.messages;
+    messages.forEach((msg) => {
+        state.messages.set(msg.id, msg);
+    });
+    state.eventCursor = response.cursor;
+    return state.eventCursor;
+}
+
+export {
+    saveEventData,
+    sendMessage,
+    render,
+    chatRequest,
+    geteventSnapshot,
+    state,
+};
diff --git a/chat-app/frontend/index.html b/chat-app/frontend/index.html
new file mode 100644
index 000000000..6d5419641
--- /dev/null
+++ b/chat-app/frontend/index.html
@@ -0,0 +1,38 @@
+<!doctype html>
+<html lang="en">
+    <head>
+        <meta charset="UTF-8" />
+        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+        <script type="module" src="pollingScript.js"></script>
+        <link rel="stylesheet" href="style.css" />
+        <title>chat app</title>
+    </head>
+    <body>
+        <header>
+            <h1>Welcome to the chat app</h1>
+        </header>
+        <main>
+            <div class="chat-stream" role="log" aria-live="polite"></div>
+            <form class="chat-input">
+                <label for="username-input">Username: </label>
+                <input
+                    type="text"
+                    name="username"
+                    id="username-input"
+                    maxlength="100"
+                    minlenght="1"
+                    autocomplete="username"
+                    required />
+                <label for="message-input">Message: </label>
+                <textarea
+                    name="msg_body"
+                    id="message-input"
+                    maxlength="500"
+                    minlength="1"
+                    rows="3"
+                    required></textarea>
+                <button type="submit">Send</button>
+            </form>
+        </main>
+    </body>
+</html>
diff --git a/chat-app/frontend/pollingScript.js b/chat-app/frontend/pollingScript.js
new file mode 100644
index 000000000..32ed4c4e0
--- /dev/null
+++ b/chat-app/frontend/pollingScript.js
@@ -0,0 +1,55 @@
+import {
+    saveEventData,
+    render,
+    chatRequest,
+    geteventSnapshot,
+    state,
+} from "./common.js";
+
+// const BACKEND_URL = "http://localhost:3000";
+
+const BACKEND_URL =
+    "https://z4k2yzxetkpevkwf6zy9ea37.trainees.hosting.cyf.academy";
+
+/**
+ * Updates message state to match the data from events.
+ * @param {List of events} events - the events to process.
+ */
+function handleEvents(events) {
+    events.forEach((event) => {
+        saveEventData(event);
+    });
+    render();
+}
+
+/**
+ * Continuously polls the event stream API for new messages or reactions.
+ * Stores new messages or reactions in state.
+ * If events fetched successfully, the event cursor state is updated.
+ * Retries after 100ms if a request fails.
+ *
+ * @param {number} wait how long to wait. no wait or 0 = short polling
+ */
+async function pollEvents(wait) {
+    let queryString = `?after=${state.eventCursor}`;
+    if (wait) {
+        queryString = queryString.concat(`&wait=${wait}`);
+    }
+
+    const url = `${BACKEND_URL}/events${queryString}`;
+    try {
+        const response = await chatRequest(url);
+        state.eventCursor = response.cursor;
+        handleEvents(response.events);
+    } catch (e) {
+        console.error("Polling failed: ", e);
+        await new Promise((resolve) => setTimeout(resolve, 100));
+        return pollEvents(wait);
+    }
+
+    pollEvents(wait);
+}
+
+geteventSnapshot();
+
+pollEvents(30);
diff --git a/chat-app/frontend/style.css b/chat-app/frontend/style.css
new file mode 100644
index 000000000..6d170908e
--- /dev/null
+++ b/chat-app/frontend/style.css
@@ -0,0 +1,121 @@
+/* 1. Use a more-intuitive box-sizing model */
+*,
+*::before,
+*::after {
+    box-sizing: border-box;
+}
+
+/* 2. Remove default margin */
+*:not(dialog) {
+    margin: 0;
+}
+
+/* 3. Enable keyword animations */
+@media (prefers-reduced-motion: no-preference) {
+    html {
+        interpolate-size: allow-keywords;
+    }
+}
+
+body {
+    /* 4. Increase line-height */
+    line-height: 1.5;
+    /* 5. Improve text rendering */
+    -webkit-font-smoothing: antialiased;
+}
+
+/* 6. Improve media defaults */
+img,
+picture,
+video,
+canvas,
+svg {
+    display: block;
+    max-width: 100%;
+}
+
+/* 7. Inherit fonts for form controls */
+input,
+button,
+textarea,
+select {
+    font: inherit;
+}
+
+/* 8. Avoid text overflows */
+p,
+h1,
+h2,
+h3,
+h4,
+h5,
+h6 {
+    overflow-wrap: break-word;
+}
+
+/* 9. Improve line wrapping */
+p {
+    text-wrap: pretty;
+}
+h1,
+h2,
+h3,
+h4,
+h5,
+h6 {
+    text-wrap: balance;
+}
+
+/*
+  10. Create a root stacking context
+*/
+#root,
+#__next {
+    isolation: isolate;
+}
+
+html,
+body {
+    height: 100%;
+    margin: 0;
+}
+
+body {
+    display: flex;
+    flex-direction: column;
+    height: 100dvh;
+}
+
+header {
+    flex: 0 0 auto;
+    padding: 0.5rem 1rem;
+}
+
+main {
+    flex: 1 1 auto;
+    min-height: 0;
+    display: flex;
+    flex-direction: column;
+}
+
+.chat-stream {
+    flex: 1 1 auto;
+    overflow-y: auto;
+    padding: 1rem;
+}
+
+.chat-input {
+    flex: 0 0 auto;
+    display: flex;
+    flex-direction: column;
+    flex-wrap: wrap;
+    gap: 0.5rem;
+    padding: 0.75rem 1rem;
+    border-top: 1px solid black;
+}
+
+.message-card {
+    padding: 1rem;
+    border: 1px solid black;
+    margin-top: 0.5rem;
+}
diff --git a/chat-app/frontend/websocketScript.js b/chat-app/frontend/websocketScript.js
new file mode 100644
index 000000000..81e31ed10
--- /dev/null
+++ b/chat-app/frontend/websocketScript.js
@@ -0,0 +1,49 @@
+import { saveEventData, render, geteventSnapshot } from "./common.js";
+
+const WS_URL = "ws://z4k2yzxetkpevkwf6zy9ea37.trainees.hosting.cyf.academy";
+// const WS_URL = "ws://localhost:3000";
+/**
+ * Updates message state to match the data from events.
+ * @param {List of events} events - the events to process.
+ */
+function handleEvents(events) {
+    events.forEach((event) => {
+        const cursor = saveEventData(event);
+        socket.send(JSON.stringify({ type: "ack", cursor }));
+    });
+    render();
+}
+let socket;
+
+function connectWebSocket() {
+    socket = new WebSocket(WS_URL);
+    socket.addEventListener("open", (event) => {
+        console.log("websocket connection opened...");
+    });
+
+    socket.addEventListener("message", (event) => {
+        const messages = JSON.parse(event.data);
+        handleEvents(messages);
+    });
+
+    socket.addEventListener("close", () => {
+        console.log("websocket connection closed");
+        setTimeout(() => {
+            connectWebSocket();
+        }, 1000);
+    });
+
+    socket.addEventListener("error", (error) => {
+        console.error("WebSocket error:", error);
+    });
+}
+
+connectWebSocket();
+
+async function getSnapshot() {
+    const cursor = await geteventSnapshot();
+    socket.send(JSON.stringify({ type: "ack", cursor }));
+    render();
+}
+
+getSnapshot();
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 000000000..66912f193
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,205 @@
+{
+  "name": "Module-Decomposition",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "dependencies": {
+        "websocket": "^1.0.35"
+      }
+    },
+    "node_modules/bufferutil": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/bufferutil/-/bufferutil-4.1.0.tgz",
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+      "hasInstallScript": true,
+      "license": "MIT",
+      "dependencies": {
+        "node-gyp-build": "^4.3.0"
+      },
+      "engines": {
+        "node": ">=6.14.2"
+      }
+    },
+    "node_modules/d": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/d/-/d-1.0.2.tgz",
+      "integrity": "sha512-MOqHvMWF9/9MX6nza0KgvFH4HpMU0EF5uUDXqX/BtxtU8NfB0QzRtJ8Oe/6SuS4kbhyzVJwjd97EA4PKrzJ8bw==",
+      "license": "ISC",
+      "dependencies": {
+        "es5-ext": "^0.10.64",
+        "type": "^2.7.2"
+      },
+      "engines": {
+        "node": ">=0.12"
+      }
+    },
+    "node_modules/debug": {
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "ms": "2.0.0"
+      }
+    },
+    "node_modules/es5-ext": {
+      "version": "0.10.64",
+      "resolved": "https://registry.npmjs.org/es5-ext/-/es5-ext-0.10.64.tgz",
+      "integrity": "sha512-p2snDhiLaXe6dahss1LddxqEm+SkuDvV8dnIQG0MWjyHpcMNfXKPE+/Cc0y+PhxJX3A4xGNeFCj5oc0BUh6deg==",
+      "hasInstallScript": true,
+      "license": "ISC",
+      "dependencies": {
+        "es6-iterator": "^2.0.3",
+        "es6-symbol": "^3.1.3",
+        "esniff": "^2.0.1",
+        "next-tick": "^1.1.0"
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+      "engines": {
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+      "license": "ISC",
+      "dependencies": {
+        "d": "^1.0.2",
+        "ext": "^1.7.0"
+      },
+      "engines": {
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+      "version": "2.0.1",
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+      }
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+    },
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+        "node-gyp-build-optional": "optional.js",
+        "node-gyp-build-test": "build-test.js"
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+      },
+      "engines": {
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+      "license": "Apache-2.0",
+      "dependencies": {
+        "bufferutil": "^4.0.1",
+        "debug": "^2.2.0",
+        "es5-ext": "^0.10.63",
+        "typedarray-to-buffer": "^3.1.5",
+        "utf-8-validate": "^5.0.2",
+        "yaeti": "^0.0.6"
+      },
+      "engines": {
+        "node": ">=4.0.0"
+      }
+    },
+    "node_modules/yaeti": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/yaeti/-/yaeti-0.0.6.tgz",
+      "integrity": "sha512-MvQa//+KcZCUkBTIC9blM+CU9J2GzuTytsOUwf2lidtvkx/6gnEp1QvJv34t9vdjhFmha/mUiNDbN0D0mJWdug==",
+      "deprecated": "Package no longer supported. Contact Support at https://www.npmjs.com/support for more info.",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.32"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 000000000..b580fb606
--- /dev/null
+++ b/package.json
@@ -0,0 +1,5 @@
+{
+  "dependencies": {
+    "websocket": "^1.0.35"
+  }
+}