diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bfa3ec69..20304278 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -33,19 +33,22 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v6
 
-      - name: Install Dependencies
-        uses: ./.github/actions/install-dependencies
-        with:
-          node-version: ${{ matrix.node }}
-
       - name: Run vercel-preparation.sh
         run: |
           chmod +x ./vercel-preparation.sh
           ./vercel-preparation.sh
 
+      - name: Install Dependencies
+        uses: ./.github/actions/install-dependencies
+        with:
+          node-version: ${{ matrix.node }}
+
       - name: Build frontend
         run: pnpm --filter frontend run build
 
+      - name: Run backend tests
+        run: pnpm --filter github-readme-stats run test
+
   frontend-test-e2e:
     name: Frontend E2E test
 
diff --git a/apps/backend/src/common/constants.js b/apps/backend/src/common/constants.js
new file mode 100644
index 00000000..483a57b5
--- /dev/null
+++ b/apps/backend/src/common/constants.js
@@ -0,0 +1,9 @@
+// @ts-check
+
+/**
+ * Valid owner affiliations for GitHub API queries.
+ * @type {Array<string>}
+ */
+const OWNER_AFFILIATIONS = ["OWNER", "COLLABORATOR", "ORGANIZATION_MEMBER"];
+
+export { OWNER_AFFILIATIONS };
diff --git a/apps/backend/src/common/database.js b/apps/backend/src/common/database.js
index cf6c508a..42fc50e3 100644
--- a/apps/backend/src/common/database.js
+++ b/apps/backend/src/common/database.js
@@ -1,6 +1,8 @@
-import pkg from "pg";
-// eslint-disable-next-line import-x/no-named-as-default-member
-const { Pool } = pkg;
+/**
+ * In the browser this has to be mocked to avoid runtime errors
+ * @see apps/frontend/vite.config.ts
+ */
+import { Pool } from "pg";
 
 export const pool = process.env.POSTGRES_URL
   ? new Pool({
diff --git a/apps/backend/src/common/error.js b/apps/backend/src/common/error.js
index 2ff57b28..b838f36d 100644
--- a/apps/backend/src/common/error.js
+++ b/apps/backend/src/common/error.js
@@ -1,6 +1,6 @@
 // @ts-check
 
-import { OWNER_AFFILIATIONS } from "./ops.js";
+import { OWNER_AFFILIATIONS } from "./constants.js";
 
 /**
  * @type {string} A general message to ask user to try again later.
diff --git a/apps/backend/src/common/ops.js b/apps/backend/src/common/ops.js
index 692673df..2aad261e 100644
--- a/apps/backend/src/common/ops.js
+++ b/apps/backend/src/common/ops.js
@@ -2,10 +2,9 @@
 
 import toEmoji from "emoji-name-map";
 
+import { OWNER_AFFILIATIONS } from "./constants.js";
 import { CustomError } from "./error.js";
 
-const OWNER_AFFILIATIONS = ["OWNER", "COLLABORATOR", "ORGANIZATION_MEMBER"];
-
 /**
  * Returns boolean if value is either "true" or "false" else the value as it is.
  *
@@ -161,7 +160,6 @@ const buildSearchFilter = (repos = [], owners = []) => {
 };
 
 export {
-  OWNER_AFFILIATIONS,
   parseBoolean,
   parseArray,
   clampValue,
diff --git a/apps/backend/tests/pat-info.test.js b/apps/backend/tests/pat-info.test.js
index 866b0abb..16d86757 100644
--- a/apps/backend/tests/pat-info.test.js
+++ b/apps/backend/tests/pat-info.test.js
@@ -12,7 +12,7 @@ import {
 } from "@jest/globals";
 import axios from "axios";
 import MockAdapter from "axios-mock-adapter";
-import { dotenv } from "dotenv";
+import * as dotenv from "dotenv";
 
 import patInfo, { RATE_LIMIT_SECONDS } from "../api-renamed/status/pat-info.js";
 
diff --git a/apps/frontend/e2e/app.spec.ts b/apps/frontend/e2e/app.spec.ts
index 882c2130..e8def4cc 100644
--- a/apps/frontend/e2e/app.spec.ts
+++ b/apps/frontend/e2e/app.spec.ts
@@ -45,25 +45,25 @@ test("navigates between steps", async ({ page }) => {
   // We are at stage 1
   await expect(page.getByRole("heading", { level: 1 })).toContainText("Login");
 
-  // Go to to stage 2
+  // Go to stage 2
   await page.getByRole("button", { name: "Select card" }).click();
   await expect(page.getByRole("heading", { level: 1 })).toContainText(
     "Select a Card",
   );
 
-  // Go to to stage 3
+  // Go to stage 3
   await page.getByRole("button", { name: "Modify parameters" }).click();
   await expect(page.getByRole("heading", { level: 1 })).toContainText(
     "Modify Card Parameters",
   );
 
-  // Go to to stage 4
+  // Go to stage 4
   await page.getByRole("button", { name: "Select theme" }).click();
   await expect(page.getByRole("heading", { level: 1 })).toContainText(
     "Choose a Theme",
   );
 
-  // Go to to stage 5
+  // Go to stage 5
   await page.getByRole("button", { name: "Display card" }).click();
   await expect(page.getByRole("heading", { level: 1 })).toContainText(
     "Display your Card",
diff --git a/apps/frontend/vite.config.ts b/apps/frontend/vite.config.ts
index 71fbcb9d..4f7153a2 100644
--- a/apps/frontend/vite.config.ts
+++ b/apps/frontend/vite.config.ts
@@ -31,7 +31,10 @@ export default defineConfig({
 
     react(),
 
-    // mock pg (postgres) package in the browser to avoid runtime errors
+    /**
+     * mock pg (postgres) package in the browser to avoid runtime errors
+     * @see apps/backend/src/common/database.js
+     */
     {
       name: "empty-pg-package",
       resolveId(id) {
@@ -42,7 +45,7 @@ export default defineConfig({
       },
       load(id) {
         if (id === "pg") {
-          return "export default {}";
+          return "export class Pool { constructor(config) {} }";
         }
         return undefined;
       },