diff --git a/backend/tests/e2e/tier4.spec.ts b/backend/tests/e2e/tier4.spec.ts
new file mode 100644
index 0000000..2c86e33
--- /dev/null
+++ b/backend/tests/e2e/tier4.spec.ts
@@ -0,0 +1,184 @@
+import { describe, expect, it } from "vitest";
+import { apiFetch, clearCookieJar } from "./setup.js";
+import type { User, Website, Domain, DnsRecord } from "../../../src/api/contracts/models.js";
+
+describe("Tier 4 E2E - Workload Application Scenarios", () => {
+  it("should successfully execute a complete real-world lifecycle workload scenario", async () => {
+    const sessionId = "tier4_lifecycle_scenario";
+    clearCookieJar(sessionId);
+
+    // 1. LOGIN
+    const loginRes = await apiFetch<{ user: User }>(
+      "/api/auth/login",
+      {
+        method: "POST",
+        sessionId,
+        body: JSON.stringify({
+          email: "owner@example.com",
+          password: "correct-password",
+        }),
+      }
+    );
+    expect(loginRes.$status).toBe(200);
+    expect(loginRes.data?.user.role).toBe("owner");
+
+    // 2. CONFIRM USER CONTEXT
+    const meRes = await apiFetch<User>("/api/auth/me", {
+      method: "GET",
+      sessionId,
+    });
+    expect(meRes.$status).toBe(200);
+    expect(meRes.data?.email).toBe("owner@example.com");
+
+    // 3. CREATE DOMAIN
+    const domainName = "workload-lifecycle.com";
+    const createDomRes = await apiFetch<Domain>("/api/domains", {
+      method: "POST",
+      sessionId,
+      body: JSON.stringify({
+        name: domainName,
+        type: "primary",
+        documentRoot: `/home/coaxys/${domainName}`,
+      }),
+    });
+    expect(createDomRes.$status).toBe(201);
+    const domainId = createDomRes.data!.id;
+    expect(domainId).toBeDefined();
+
+    // 4. CONFIRM DOMAIN IN LIST
+    const listDomRes = await apiFetch<Domain[]>("/api/domains", {
+      method: "GET",
+      sessionId,
+    });
+    expect(listDomRes.$status).toBe(200);
+    const foundDom = listDomRes.data!.find((d) => d.id === domainId);
+    expect(foundDom).toBeDefined();
+    expect(foundDom?.name).toBe(domainName);
+
+    // 5. CREATE WEBSITE MAPPED TO DOMAIN
+    const siteName = "Workload Production App";
+    const createSiteRes = await apiFetch<Website>("/api/websites", {
+      method: "POST",
+      sessionId,
+      body: JSON.stringify({
+        name: siteName,
+        domain: domainName,
+        runtime: "Node.js",
+        environment: "production",
+      }),
+    });
+    expect(createSiteRes.$status).toBe(201);
+    const siteId = createSiteRes.data!.id;
+    expect(siteId).toBeDefined();
+
+    // 6. CONFIRM WEBSITE IN LIST
+    const listSiteRes = await apiFetch<Website[]>("/api/websites", {
+      method: "GET",
+      sessionId,
+    });
+    expect(listSiteRes.$status).toBe(200);
+    const foundSite = listSiteRes.data!.find((w) => w.id === siteId);
+    expect(foundSite).toBeDefined();
+    expect(foundSite?.name).toBe(siteName);
+    expect(foundSite?.domain).toBe(domainName);
+
+    // 7. GET WEBSITE DETAILS
+    const detailSiteRes = await apiFetch<Website>(`/api/websites/${siteId}`, {
+      method: "GET",
+      sessionId,
+    });
+    expect(detailSiteRes.$status).toBe(200);
+    expect(detailSiteRes.data?.name).toBe(siteName);
+
+    // 8. UPDATE WEBSITE CONFIGS
+    const updateSiteRes = await apiFetch<Website>(`/api/websites/${siteId}`, {
+      method: "PUT",
+      sessionId,
+      body: JSON.stringify({
+        runtime: "Docker",
+        environment: "staging",
+      }),
+    });
+    expect(updateSiteRes.$status).toBe(200);
+    expect(updateSiteRes.data?.runtime).toBe("Docker");
+    expect(updateSiteRes.data?.environment).toBe("staging");
+
+    // 9. ADD DNS RECORD TO DOMAIN
+    const createDnsRes = await apiFetch<DnsRecord>(`/api/domains/${domainId}/dns`, {
+      method: "POST",
+      sessionId,
+      body: JSON.stringify({
+        name: "api",
+        ttl: 14400,
+        type: "A",
+        record: "192.0.2.99",
+      }),
+    });
+    expect(createDnsRes.$status).toBe(201);
+    const recordId = createDnsRes.data!.id;
+    expect(recordId).toBeDefined();
+
+    // 10. LIST AND VERIFY DNS RECORD
+    const listDnsRes = await apiFetch<DnsRecord[]>(`/api/domains/${domainId}/dns`, {
+      method: "GET",
+      sessionId,
+    });
+    expect(listDnsRes.$status).toBe(200);
+    const foundRecord = listDnsRes.data!.find((r) => r.id === recordId);
+    expect(foundRecord).toBeDefined();
+    expect(foundRecord?.record).toBe("192.0.2.99");
+
+    // 11. DELETE DNS RECORD
+    const deleteDnsRes = await apiFetch<{ deleted: string }>(
+      `/api/domains/${domainId}/dns/${recordId}`,
+      {
+        method: "DELETE",
+        sessionId,
+      }
+    );
+    expect(deleteDnsRes.$status).toBe(200);
+
+    // 12. DELETE WEBSITE
+    const deleteSiteRes = await apiFetch<{ deleted: string }>(`/api/websites/${siteId}`, {
+      method: "DELETE",
+      sessionId,
+    });
+    expect(deleteSiteRes.$status).toBe(200);
+
+    // 13. CONFIRM WEBSITE DELETED
+    const confirmSiteDeleted = await apiFetch(`/api/websites/${siteId}`, {
+      method: "GET",
+      sessionId,
+    });
+    expect(confirmSiteDeleted.$status).toBe(404);
+
+    // 14. DELETE DOMAIN
+    const deleteDomRes = await apiFetch<{ deleted: string }>(`/api/domains/${domainId}`, {
+      method: "DELETE",
+      sessionId,
+    });
+    expect(deleteDomRes.$status).toBe(200);
+
+    // 15. CONFIRM DOMAIN DELETED
+    const confirmDomDeleted = await apiFetch(`/api/domains/${domainId}`, {
+      method: "GET",
+      sessionId,
+    });
+    expect(confirmDomDeleted.$status).toBe(404);
+
+    // 16. LOGOUT
+    const logoutRes = await apiFetch<{ ok: boolean }>("/api/auth/logout", {
+      method: "POST",
+      sessionId,
+    });
+    expect(logoutRes.$status).toBe(200);
+    expect(logoutRes.data?.ok).toBe(true);
+
+    // 17. CONFIRM LOGGED OUT
+    const confirmMeLoggedOut = await apiFetch("/api/auth/me", {
+      method: "GET",
+      sessionId,
+    });
+    expect(confirmMeLoggedOut.$status).toBe(401);
+  });
+});