diff --git a/src/backend/src/modules/puterexec/Judge0Client.js b/src/backend/src/modules/puterexec/Judge0Client.js
index 23ad4f66..15c2c556 100644
--- a/src/backend/src/modules/puterexec/Judge0Client.js
+++ b/src/backend/src/modules/puterexec/Judge0Client.js
@@ -12,6 +12,17 @@ class Judge0Client {
         return await this.get_('/about');
     }
 
+    async create_submission ({ lang_id, code }) {
+        return await this.post_('/submissions', {
+            language_id: lang_id,
+            source_code: code,
+        });
+    }
+
+    async get_submission (id) {
+        return await this.get_(`/submissions/${id}`);
+    }
+
     async get_ (path) {
         if ( ! path.startsWith('/') ) {
             path = `/${path}`;
@@ -27,6 +38,24 @@ class Judge0Client {
 
         return resp.data;
     }
+
+    async post_ (path, data) {
+        if ( ! path.startsWith('/') ) {
+            path = `/${path}`;
+        }
+
+        const resp = await axios.request({
+            method: 'POST',
+            url: `${this.baseURL}${path}`,
+            headers: {
+                Authorization: `Bearer ${this.token}`,
+                'Content-Type': 'application/json',
+            },
+            data,
+        });
+
+        return resp.data;
+    }
 }
 
 module.exports = { Judge0Client };
\ No newline at end of file
diff --git a/src/backend/src/modules/puterexec/Judge0Service.js b/src/backend/src/modules/puterexec/Judge0Service.js
index 872449d1..bbe0bc9f 100644
--- a/src/backend/src/modules/puterexec/Judge0Service.js
+++ b/src/backend/src/modules/puterexec/Judge0Service.js
@@ -1,33 +1,90 @@
+const putility = require("@heyputer/putility");
 const BaseService = require("../../services/BaseService");
 const { Judge0Client } = require("./Judge0Client");
+const { Context } = require("../../util/context");
 
 class Judge0Service extends BaseService {
     _construct () {
         this.about_ = {};
     }
 
+    async _init () {
+        this.languages = require('./languages/languages');
+        this.client = new Judge0Client({
+            token: this.config.token,
+        });
+
+        // this.submissions_ = {};
+    }
+
     static IMPLEMENTS = {
         ['puter-exec']: {
             async about () {
                 return this.about ?? (this.about = await this.client.about());
             },
             async supported () {
-                return require('./languages/languages');
             },
             async exec ({ runtime, code }) {
-                return await this.exec_(runtime, code);
+                return await this.exec_({ runtime, code });
             }
         }
     }
 
-    async _init () {
-        this.client = new Judge0Client({
-            token: this.config.token,
-        });
-    }
+    async exec_ ({ runtime, code }) {
+        const lang_id = (() => {
+            if ( runtime.startsWith('j0-') ) {
+                return runtime.slice(3);
+            }
+            let lang = this.languages.find((lang) => lang.language === runtime);
+            if ( lang ) {
+                return lang.judge0_id;
+            }
+        })();
 
-    async exec_ (runtime, code) {
-        //
+        if ( !lang_id ) {
+            throw new Error(`Language or runtime not found: ${runtime}`);
+        }
+
+        const result = await this.client.create_submission({
+            lang_id,
+            code,
+        });
+
+        const submission_done = new putility.libs.promise.TeePromise();
+        (async () => {
+            // Need to poll the submission until it's done
+            let poll = setInterval(async () => {
+                const submission = await this.client.get_submission(result.token);
+                if ( submission.status.id >= 3 ) {
+                    clearInterval(poll);
+                    // this.submissions_[result.id] = submission;
+                    submission_done.resolve(submission);
+                }
+            });
+
+            // Wait for the submission to be done
+            const submission = await submission_done;
+
+            this.log.noticeme('Submission done', submission);
+            
+            // Send event
+            const svc_event = this.services.get('event');
+            svc_event.emit('puter-exec.submission.done', {
+                id: submission.token,
+                actor: Context.get('actor'),
+                output: submission.stdout,
+                summary: submission.message,
+                measures: {
+                    time: submission.time,
+                    memory: submission.memory,
+                },
+                aux_outputs: {
+                    compile: submission.compile_output,
+                },
+            });
+        })();
+
+        return result;
     }
 }
 
diff --git a/src/backend/src/modules/puterexec/PuterExecModule.js b/src/backend/src/modules/puterexec/PuterExecModule.js
index bd00eae3..3730a027 100644
--- a/src/backend/src/modules/puterexec/PuterExecModule.js
+++ b/src/backend/src/modules/puterexec/PuterExecModule.js
@@ -8,6 +8,11 @@ class PuterExecModule extends AdvancedBase {
 
         const ExecInterfaceService = require('./ExecInterfaceService');
         services.registerService('__exec-interfaces', ExecInterfaceService);
+
+        if ( !! config?.services?.['judge0'] ) {
+            const Judge0Service = require('./Judge0Service');
+            services.registerService('judge0', Judge0Service);
+        }
     }
 }