diff --git a/apps/e2e/tests/fixtures.ts b/apps/e2e/tests/fixtures.ts
index 6dc1c72..d043cc1 100644
--- a/apps/e2e/tests/fixtures.ts
+++ b/apps/e2e/tests/fixtures.ts
@@ -10,12 +10,27 @@ import { test as base } from "@playwright/test";
  *
  * This ensures E2E tests render pages directly without the login redirect.
  */
+const MOCK_DEV_USERS = {
+  staff: [
+    { id: "staff-1", name: "Alice Groomer", email: "alice@groombook.dev", role: "groomer" },
+    { id: "staff-2", name: "Bob Manager", email: "bob@groombook.dev", role: "manager" },
+  ],
+  clients: [
+    { id: "client-1", name: "Carol Client", email: "carol@example.com", petCount: 2 },
+    { id: "client-2", name: "Dave Client", email: null, petCount: 1 },
+  ],
+};
+
 export const test = base.extend({
   page: async ({ page }, use) => {
     // Mock the dev config endpoint so the app skips the auth-disabled redirect
     await page.route("**/api/dev/config", (route) =>
       route.fulfill({ json: { authDisabled: false } })
     );
+    // Mock the dev users endpoint for login selector tests
+    await page.route("**/api/dev/users", (route) =>
+      route.fulfill({ json: MOCK_DEV_USERS })
+    );
     // Mock the branding endpoint so BrandingProvider resolves immediately
     await page.route("**/api/branding", (route) =>
       route.fulfill({
diff --git a/apps/e2e/tests/impersonation.spec.ts b/apps/e2e/tests/impersonation.spec.ts
new file mode 100644
index 0000000..ac246d8
--- /dev/null
+++ b/apps/e2e/tests/impersonation.spec.ts
@@ -0,0 +1,85 @@
+import { test, expect } from "./fixtures.js";
+
+/**
+ * E2E tests for customer portal impersonation flow.
+ * Tests ImpersonationBanner display, actions, and session management.
+ */
+
+const MOCK_SESSION = {
+  id: "session-1",
+  staffId: "staff-1",
+  clientId: "client-1",
+  reason: "Testing customer booking flow",
+  status: "active",
+  startedAt: new Date().toISOString(),
+  endedAt: null,
+  expiresAt: new Date(Date.now() + 30 * 60 * 1000).toISOString(),
+  createdAt: new Date().toISOString(),
+};
+
+test.describe("ImpersonationBanner", () => {
+  test.beforeEach(async ({ page }) => {
+    await page.route("**/api/impersonation/sessions/session-1", (route) =>
+      route.fulfill({ json: MOCK_SESSION })
+    );
+    await page.route("**/api/impersonation/sessions/session-1/end", (route) =>
+      route.fulfill({ json: { status: "ended" } })
+    );
+    await page.route("**/api/impersonation/sessions/session-1/extend", (route) =>
+      route.fulfill({ json: { ...MOCK_SESSION, expiresAt: new Date(Date.now() + 60 * 60 * 1000).toISOString() } })
+    );
+    await page.route("**/api/impersonation/sessions/session-1/audit-log", (route) =>
+      route.fulfill({ json: { logs: [] } })
+    );
+  });
+
+  test("banner displays when session is active", async ({ page }) => {
+    await page.goto("/?sessionId=session-1");
+    await expect(page.locator("[data-testid=\"impersonation-banner\"]")).toBeVisible();
+    await expect(page.getByTestId("impersonation-banner").getByText("STAFF VIEW")).toBeVisible();
+  });
+
+  test("banner shows reason when session has reason", async ({ page }) => {
+    await page.goto("/?sessionId=session-1");
+    await expect(page.getByText(/Reason: Testing customer booking flow/)).toBeVisible();
+  });
+
+  test("banner shows started time", async ({ page }) => {
+    await page.goto("/?sessionId=session-1");
+    await expect(page.getByText(/Started/)).toBeVisible();
+  });
+
+  test("End Session button is visible", async ({ page }) => {
+    await page.goto("/?sessionId=session-1");
+    await expect(page.getByRole("button", { name: /End Session/ })).toBeVisible();
+  });
+
+  test("Audit button is visible", async ({ page }) => {
+    await page.goto("/?sessionId=session-1");
+    await expect(page.getByRole("button", { name: /Audit/ })).toBeVisible();
+  });
+
+  test("clicking End Session calls API and redirects", async ({ page }) => {
+    await page.goto("/?sessionId=session-1");
+    await page.getByRole("button", { name: /End Session/ }).click();
+    await expect(page.getByText("STAFF VIEW")).not.toBeVisible();
+  });
+
+  test("Extend button appears when time is low and not extended", async ({ page }) => {
+    const lowTimeSession = {
+      ...MOCK_SESSION,
+      expiresAt: new Date(Date.now() + 3 * 60 * 1000).toISOString(),
+    };
+    await page.route("**/api/impersonation/sessions/session-1", (route) =>
+      route.fulfill({ json: lowTimeSession })
+    );
+    await page.goto("/?sessionId=session-1");
+    await expect(page.getByRole("button", { name: /Extend/ })).toBeVisible();
+  });
+
+  test("URL is cleaned when session ends", async ({ page }) => {
+    await page.goto("/?sessionId=session-1");
+    await page.getByRole("button", { name: /End Session/ }).click();
+    await expect(page).not.toHaveURL(/sessionId=session-1/);
+  });
+});
diff --git a/apps/e2e/tests/login.spec.ts b/apps/e2e/tests/login.spec.ts
new file mode 100644
index 0000000..6081f45
--- /dev/null
+++ b/apps/e2e/tests/login.spec.ts
@@ -0,0 +1,74 @@
+import { test, expect } from "./fixtures.js";
+
+/**
+ * E2E tests for the DevLoginSelector page (/login).
+ * Tests staff/client selection, skip login, and navigation redirects.
+ */
+
+test.describe("DevLoginSelector", () => {
+  test("renders login page with staff and clients sections", async ({ page }) => {
+    await page.goto("/login");
+    await expect(page.getByText("Dev Login Selector")).toBeVisible();
+    await expect(page.getByText("Staff")).toBeVisible();
+    await expect(page.getByText("Clients")).toBeVisible();
+  });
+
+  test("shows loading state while fetching users", async ({ page }) => {
+    await page.unroute("**/api/dev/users");
+    await page.route("**/api/dev/users", async (route) => {
+      await new Promise((r) => setTimeout(r, 200));
+      await route.fulfill({ json: { staff: [], clients: [] } });
+    });
+    await page.goto("/login");
+    await expect(page.getByText("Loading users...")).toBeVisible();
+  });
+
+  test("displays staff users with role and email", async ({ page }) => {
+    await page.goto("/login");
+    await expect(page.getByText("Alice Groomer")).toBeVisible();
+    await expect(page.getByText("groomer · alice@groombook.dev")).toBeVisible();
+    await expect(page.getByText("Bob Manager")).toBeVisible();
+    await expect(page.getByText("manager · bob@groombook.dev")).toBeVisible();
+  });
+
+  test("displays client users with pet count", async ({ page }) => {
+    await page.goto("/login");
+    await expect(page.getByText("Carol Client")).toBeVisible();
+    await expect(page.getByText("2 pets · carol@example.com")).toBeVisible();
+    await expect(page.getByText("Dave Client")).toBeVisible();
+    await expect(page.getByText("1 pet")).toBeVisible();
+  });
+
+  test("clicking staff user navigates to /admin and stores dev-user", async ({ page }) => {
+    await page.goto("/login");
+    await page.getByText("Alice Groomer").click();
+    await expect(page).toHaveURL("/admin");
+    const devUser = await page.evaluate(() => localStorage.getItem("dev-user"));
+    expect(JSON.parse(devUser!)).toMatchObject({ type: "staff", id: "staff-1", name: "Alice Groomer" });
+  });
+
+  test("clicking client user navigates to / and stores dev-user", async ({ page }) => {
+    await page.goto("/login");
+    await page.getByText("Carol Client").click();
+    await expect(page).toHaveURL("/");
+    const devUser = await page.evaluate(() => localStorage.getItem("dev-user"));
+    expect(JSON.parse(devUser!)).toMatchObject({ type: "client", id: "client-1", name: "Carol Client" });
+  });
+
+  test("skip login removes dev-user and navigates to /admin", async ({ page }) => {
+    await page.goto("/login");
+    await page.getByText("Continue as default dev user").click();
+    await expect(page).toHaveURL("/admin");
+    const devUser = await page.evaluate(() => localStorage.getItem("dev-user"));
+    expect(devUser).toBeNull();
+  });
+
+  test("no users available shows empty sections", async ({ page }) => {
+    await page.route("**/api/dev/users", (route) =>
+      route.fulfill({ json: { staff: [], clients: [] } })
+    );
+    await page.goto("/login");
+    await expect(page.getByText("Staff")).toBeVisible();
+    await expect(page.getByText("Clients")).toBeVisible();
+  });
+});
diff --git a/apps/web/src/portal/ImpersonationBanner.tsx b/apps/web/src/portal/ImpersonationBanner.tsx
index a019330..65259a0 100644
--- a/apps/web/src/portal/ImpersonationBanner.tsx
+++ b/apps/web/src/portal/ImpersonationBanner.tsx
@@ -35,7 +35,7 @@ export function ImpersonationBanner({ session, isExtended, onEnd, onExtend, onSh
   }, [session.expiresAt, onEnd]);
 
   return (
-    <div className="sticky top-0 z-40 bg-amber-500 text-amber-950 px-4 py-2.5 flex flex-wrap items-center gap-x-4 gap-y-1 text-sm font-medium shadow-md">
+    <div data-testid="impersonation-banner" className="sticky top-0 z-40 bg-amber-500 text-amber-950 px-4 py-2.5 flex flex-wrap items-center gap-x-4 gap-y-1 text-sm font-medium shadow-md">
       <span className="flex items-center gap-1.5">
         <Eye size={16} />
         STAFF VIEW