diff --git a/client/api/applications.ts b/client/api/applications.ts
new file mode 100644
index 00000000..e82bca08
--- /dev/null
+++ b/client/api/applications.ts
@@ -0,0 +1,107 @@
+export interface Application {
+  id: string;
+  creator_id: string;
+  opportunity_id: string;
+  status: "submitted" | "reviewing" | "accepted" | "rejected" | "withdrawn";
+  cover_letter: string;
+  response_message?: string;
+  applied_at: string;
+  updated_at: string;
+  aethex_opportunities?: {
+    id: string;
+    title: string;
+    arm_affiliation: string;
+    job_type: string;
+    posted_by_id: string;
+    aethex_creators: {
+      username: string;
+      avatar_url: string;
+    };
+  };
+}
+
+export interface ApplicationsResponse {
+  data: Application[];
+  pagination: {
+    page: number;
+    limit: number;
+    total: number;
+    pages: number;
+  };
+}
+
+export interface ApplicationWithCreator {
+  id: string;
+  creator_id: string;
+  status: string;
+  cover_letter: string;
+  applied_at: string;
+  aethex_creators: {
+    username: string;
+    avatar_url: string;
+    bio: string;
+    skills: string[];
+  };
+}
+
+const API_BASE = process.env.VITE_API_BASE || "";
+
+export async function getMyApplications(filters?: {
+  status?: string;
+  page?: number;
+  limit?: number;
+}): Promise<ApplicationsResponse> {
+  const params = new URLSearchParams();
+  if (filters?.status) params.append("status", filters.status);
+  if (filters?.page) params.append("page", String(filters.page));
+  if (filters?.limit) params.append("limit", String(filters.limit));
+
+  const response = await fetch(`${API_BASE}/api/applications/me?${params}`);
+  if (!response.ok) throw new Error("Failed to fetch applications");
+  return response.json();
+}
+
+export async function getApplicationsForOpportunity(opportunityId: string) {
+  const response = await fetch(
+    `${API_BASE}/api/opportunities/${opportunityId}/applications`
+  );
+  if (!response.ok) throw new Error("Failed to fetch applications");
+  const data = await response.json();
+  return data.data as ApplicationWithCreator[];
+}
+
+export async function submitApplication(data: {
+  opportunity_id: string;
+  cover_letter: string;
+}): Promise<Application> {
+  const response = await fetch(`${API_BASE}/api/applications`, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify(data),
+  });
+  if (!response.ok) throw new Error("Failed to submit application");
+  return response.json();
+}
+
+export async function updateApplicationStatus(
+  applicationId: string,
+  data: {
+    status: "reviewing" | "accepted" | "rejected";
+    response_message?: string;
+  }
+): Promise<Application> {
+  const response = await fetch(`${API_BASE}/api/applications/${applicationId}/status`, {
+    method: "PUT",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify(data),
+  });
+  if (!response.ok) throw new Error("Failed to update application");
+  return response.json();
+}
+
+export async function withdrawApplication(applicationId: string): Promise<void> {
+  const response = await fetch(`${API_BASE}/api/applications/${applicationId}`, {
+    method: "DELETE",
+  });
+  if (!response.ok) throw new Error("Failed to withdraw application");
+}