diff --git a/README.md b/README.md
index 7714dff6d0..d59a2c817c 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,7 @@
 
 
 ### API Endpoints
+#### Question Service
 The question microservice exposes the following API endpoints:
 - ```questions/all``` - Returns all the questions available on the database.
 - ```questions/byId/[Question ID]``` - Returns a single question by ID number.
@@ -13,8 +14,49 @@ The question microservice exposes the following API endpoints:
 - ```questions/delete/[Question ID]``` - Deletes a question from the database by ID number.
 - ```questions/update/[Question ID]``` - Updates a question from the database by ID number.
 - ```questions/patch/[Question ID]``` - Patches a question from the database by ID number.
-The matching microservice exposes the following API endpoints:
-- ```matching/produce``` - Produce a message to Kafka.
+
+#### Matching Service
+The matching microservice exposes the following API endpoint (via a WebSocket connection):
+- ```/``` - Persistently opens a connection to the service.
+
+Message Protocol (JSON):
+
+**Note**: WebSocket only sends strings, so use ```JSON.stringify()``` to convert your JS request objects into strings (and ```JSON.parse()``` to parse responses) when communicating via WebSocket.<br>
+
+1. To enqueue a user:
+```
+{
+  event: "enqueue",
+  userId: <ID of the user>,
+  questions: [<Array containing question IDs.>]
+}
+```
+Replies with:
+
+- On successful match within 30s:
+```
+{
+  event: "match-success",
+  userId: <ID of this user>,
+  peerUserId: <ID of the other user>,
+  agreedQuestion: <The question that has been agreed upon by both users>
+}
+```
+- On timeout after 30s (no match found):
+```
+{
+   event: "match-timeout",
+   userId: <ID of this user>
+}
+```
+2. To dequeue a user:
+- Replies with an ```dequeue-success``` event.
+```
+{
+  "event": "dequeue",
+  "userId": <ID of this user>,
+}
+```
 
 ### Running PeerPrep
 In the root directory, run
diff --git a/backend/matching-service/controllers/matchingController.js b/backend/matching-service/controllers/matchingController.js
index d66cf42841..dfd79b485e 100644
--- a/backend/matching-service/controllers/matchingController.js
+++ b/backend/matching-service/controllers/matchingController.js
@@ -1,5 +1,8 @@
 // controllers/matchingController.js
 const { Kafka } = require('kafkajs');
+const EventEmitter = require('events');
+const QUEUE_TIME = 30000;
+const BATCH_INTERVAL = 10000;
 
 // Kafka setup
 const kafka = new Kafka({
@@ -7,55 +10,164 @@ const kafka = new Kafka({
     brokers: ['kafka:9092'],  // 'kafka' is the service name from docker-compose
 });
 
+process.on('SIGTERM', async () => {
+    console.log('Shutting down...');
+    await producer.disconnect();
+    await consumer.disconnect();
+    process.exit(0);
+  });
+
 const producer = kafka.producer();
 const consumer = kafka.consumer({ groupId: 'matching-group' });
 
-// Produce a message to Kafka (used in the POST /produce route)
-const produceMessage = async (req, res) => {
-    const { message } = req.body;
+(async () => {
     try {
         await producer.connect();
-        await producer.send({
-            topic: 'test-topic',
-            messages: [{ value: message }],
+        await consumer.connect();
+    } catch(error) {
+        console.error(error)
+    }
+})();
+
+const eventEmitter = new EventEmitter();
+let dequeued = new Map();
+
+const matchmakeUser = async (userId, questions) => {
+    return new Promise((resolve, reject) => {
+        produceMessage({
+            userId: userId,
+            questions: questions
+        }, false);
+        eventEmitter.once(`success-${userId}`, (peerUserId, question) => {
+            const res = {
+                event: "match-success",
+                userId: userId,
+                peerUserId: peerUserId,
+                agreedQuestion: question
+            }
+            resolve(JSON.stringify(res));
+            // resolve(`User ${userId} matched with User ${peerUserId}.`)
+        });
+        eventEmitter.once(`dequeue-${userId}`, () => {
+            dequeued.set(userId, true);
+            const res = {
+                event: "dequeued-success",
+                userId: userId
+            }
+            resolve(JSON.stringify(res));
+            // resolve(`User ${userId} dequeued from matchmaking.`)
+        })
+        setTimeout(() => {
+            const rejectionMsg = {
+                event: "match-timeout",
+                userId: userId
+            };
+            reject(JSON.stringify(rejectionMsg));
+            // reject(`No matches for ${userId}.`)
+        }, QUEUE_TIME);
+    })
+}
+
+const dequeueUser = async (userId) => {
+    eventEmitter.emit(`dequeue-${userId}`);
+}
+
+// Produce a message to Kafka (used in the POST /produce route)
+const produceMessage = async (request, isRequeue = false) => {
+    const msg = {
+        userId: request.userId,
+        questions: request.questions,
+        enqueueTime: isRequeue ? request.enqueueTime : Date.now()
+    }
+    const stringifiedMsg = JSON.stringify(msg)
+    const message = {
+        topic: 'test-topic',
+        messages: [
+            {value: stringifiedMsg}
+        ],
+    }
+    try {
+        await producer.send(message).then(() => {
+            console.log(`Enqueued message: ${stringifiedMsg}`)
         });
-        await producer.disconnect();
-        res.status(200).send(`Message produced: ${message}`);
     } catch (error) {
         console.error('Error producing message:', error);
-        res.status(500).send('Failed to produce message');
     }
 };
 
 // Produce a startup message when the service starts
 const produceStartupMessage = async () => {
     try {
-        await producer.connect();
         const message = 'Hello from producer';
-        await producer.send({
-            topic: 'test-topic',
-            messages: [{ value: message }],
-        });
         console.log(`Produced startup message: ${message}`);
-        await producer.disconnect();
     } catch (error) {
         console.error('Error producing startup message:', error);
     }
 };
 
+let batch = [];
+
+const batchProcess = () => {
+    if (batch.length == 0) {
+        console.log("No messages to process in this batch cycle.");
+        return;
+    }
+    batch.sort((A, B) => A.questions.length - B.questions.length);
+    console.log(`sorted batch is`, batch);
+    let questionDict = new Map();
+    let unmatchedUsers = new Map();
+    batch.forEach((user) => {
+        if (!dequeued.has(user.userId)) {
+            unmatchedUsers.set(user.userId, user);
+        }
+    });
+    for (const user of batch) {
+        if (Date.now() - user.enqueueTime >= QUEUE_TIME) {
+            // User has timed out.
+            // TODO: send timeout event emitter.
+            unmatchedUsers.delete(user.userId);
+            continue;
+        }
+        if (!unmatchedUsers.has(user.userId)) {
+            // User has already been matched/dequeued.
+            continue;
+        }
+        
+        user.questions.forEach((question) => {
+            const peerUserId = questionDict.get(question);
+            // Note: UserId cannot be 0, 
+            // since 0 is falsy and would break this if-conditional.
+            if (peerUserId && unmatchedUsers.has(peerUserId)) {
+                // Found match!!
+                eventEmitter.emit(`success-${user.userId}`, peerUserId, question)
+                eventEmitter.emit(`success-${peerUserId}`, user.userId, question)
+                unmatchedUsers.delete(user.userId);
+                unmatchedUsers.delete(peerUserId);
+            } else {
+                // Else, keep looking
+                questionDict.set(question, user.userId)
+            }
+        })
+    }
+        for (const [key, user] of unmatchedUsers) {
+            produceMessage(user, true)
+            console.log(`User ${key} returned to queue.`)
+        }
+        batch = [];
+        dequeued.clear();
+};
+
 // Start consuming messages from Kafka
 const runConsumer = async () => {
     try {
-        await consumer.connect();
         await consumer.subscribe({ topic: 'test-topic', fromBeginning: true });
 
+        setInterval(batchProcess, BATCH_INTERVAL);
+
         await consumer.run({
             eachMessage: async ({ topic, partition, message }) => {
-                console.log({
-                    partition,
-                    offset: message.offset,
-                    value: message.value.toString(),
-                });
+                const parsedJsonMsg = JSON.parse(message.value);
+                batch.push(parsedJsonMsg);
             },
         });
     } catch (error) {
@@ -64,7 +176,7 @@ const runConsumer = async () => {
 };
 
 module.exports = {
-    produceMessage,
-    produceStartupMessage,
     runConsumer,
+    matchmakeUser,
+    dequeueUser
 };
diff --git a/backend/matching-service/index.js b/backend/matching-service/index.js
index f0357fb44c..d371d8e3d1 100644
--- a/backend/matching-service/index.js
+++ b/backend/matching-service/index.js
@@ -1,25 +1,35 @@
-// index.js
-const express = require('express');
-const kafkaRoutes = require('./routes/matchingRoutes');
-const { produceStartupMessage, runConsumer } = require('./controllers/matchingController');
+const WebSocket = require("ws");
 
-// Create an Express app
-const app = express();
-const port = process.env.PORT || 3002;
+const wss = new WebSocket.Server({port: 3002});
+const { matchmakeUser, runConsumer, dequeueUser} = require("./controllers/matchingController");
 
-// Middleware to parse JSON bodies
-app.use(express.json());
+console.log("Started Websocket server!!!");
 
-// Use the Kafka routes
-app.use('/matching', kafkaRoutes);
+runConsumer().catch(console.error);
 
-// Start the Express server and Kafka consumer
-app.listen(port, async () => {
-    console.log(`Matching service running on port ${port}`);
+wss.on("connection", (ws) => {
+    console.log("New Client Connected");
+    ws.send("Welcome to websocket server");
 
-    // Produce a message on startup
-    await produceStartupMessage();
+    ws.on('message', async (msg) => {
+        msg = JSON.parse(msg)
+        if (msg.event == "enqueue") {
+            let res;
+            try {
+                res = await matchmakeUser(msg.userId, msg.questions)
+            } catch (failure) {
+                res = failure
+            }
+            ws.send(res)
+            ws.close()
+        } else if (msg.event == "dequeue") {
+            dequeueUser(msg.userId);
+            ws.close();
+            console.log("User has been dequeued")
+        }
+    });
 
-    // Start consuming messages
-    runConsumer().catch(console.error);
-});
+    ws.on("close", () => {
+        console.log("Client has disconnected")
+    });
+})
\ No newline at end of file
diff --git a/backend/matching-service/package-lock.json b/backend/matching-service/package-lock.json
new file mode 100644
index 0000000000..0cf37f8540
--- /dev/null
+++ b/backend/matching-service/package-lock.json
@@ -0,0 +1,1181 @@
+{
+  "name": "matching-service",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "matching-service",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "express": "^4.18.2",
+        "kafkajs": "^2.0.0",
+        "ws": "^8.18.0"
+      },
+      "devDependencies": {
+        "nodemon": "^3.1.7"
+      }
+    },
+    "node_modules/accepts": {
+      "version": "1.3.8",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "mime-types": "~2.1.34",
+        "negotiator": "0.6.3"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/anymatch": {
+      "version": "3.1.3",
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+      "dev": true,
+      "license": "ISC",
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+    "node_modules/array-flatten": {
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+      "license": "MIT"
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+    "node_modules/balanced-match": {
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+    },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/ws": {
+      "version": "8.18.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.18.0.tgz",
+      "integrity": "sha512-8VbfWfHLbbwu3+N6OKsOMpBdT4kXPDDB9cJk2bJ6mh9ucxdlnNvH1e+roYkKmN9Nxw2yjz7VzeO9oOz2zJ04Pw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    }
+  }
+}
diff --git a/backend/matching-service/package.json b/backend/matching-service/package.json
index 4bb3c68b82..4646800d69 100644
--- a/backend/matching-service/package.json
+++ b/backend/matching-service/package.json
@@ -3,14 +3,19 @@
   "version": "1.0.0",
   "main": "index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "dev": "nodemon index.js"
   },
   "dependencies": {
     "express": "^4.18.2",
-    "kafkajs": "^2.0.0"
+    "kafkajs": "^2.0.0",
+    "ws": "^8.18.0"
   },
   "keywords": [],
   "author": "",
   "license": "ISC",
-  "description": ""
-}
\ No newline at end of file
+  "description": "",
+  "devDependencies": {
+    "nodemon": "^3.1.7"
+  }
+}
diff --git a/backend/matching-service/routes/matchingRoutes.js b/backend/matching-service/routes/matchingRoutes.js
index f6ab1a0b0e..e69de29bb2 100644
--- a/backend/matching-service/routes/matchingRoutes.js
+++ b/backend/matching-service/routes/matchingRoutes.js
@@ -1,10 +0,0 @@
-// routes/matchingRoutes.js
-const express = require('express');
-const { produceMessage } = require('../controllers/matchingController');
-
-const router = express.Router();
-
-// Route for producing a message to Kafka
-router.post('/produce', produceMessage);
-
-module.exports = router;
diff --git a/docker-compose.yml b/docker-compose.yml
index fa036a4f4b..fa531baa2e 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -42,7 +42,7 @@ services:
     ports:
       - "2181:2181"
     healthcheck:
-      test: ["CMD", "echo", "ruok", "|", "nc", "localhost", "2181", "|", "grep", "imok"]
+      test: [ "CMD", "echo", "ruok", "|", "nc", "localhost", "2181", "|", "grep", "imok" ]
       interval: 10s
       timeout: 5s
       retries: 5
@@ -61,7 +61,7 @@ services:
       zookeeper:
         condition: service_healthy
     healthcheck:
-      test: ["CMD", "nc", "-z", "localhost", "9092"]
+      test: [ "CMD", "nc", "-z", "localhost", "9092" ]
       interval: 10s
       timeout: 5s
       retries: 10