diff --git a/app/frontend/src/app/settings/page.tsx b/app/frontend/src/app/settings/page.tsx
index f0c27699e..a7687721e 100644
--- a/app/frontend/src/app/settings/page.tsx
+++ b/app/frontend/src/app/settings/page.tsx
@@ -1,16 +1,19 @@
 "use client";
 
-import { useState } from "react";
+import { useState, useEffect } from "react";
 import Image from "next/image";
 import Link from "next/link";
 import { NetworkBadge } from "@/components/NetworkBadge";
 import { LocaleSwitcher } from "@/components/LocaleSwitcher";
 import '@/lib/i18n';
 import { useTranslation } from "react-i18next";
+import { useApi } from "@/hooks/useApi";
+import { getProfile, saveProfile } from "@/lib/api";
+import { validateProfile, type Profile, type ProfileValidationErrors } from "@/types/profile";
 
 export default function Settings() {
   const { t } = useTranslation();
-  const [form, setForm] = useState({
+  const [form, setForm] = useState<Profile>({
     username: "john_doe",
     primaryColor: "#6366f1",
     avatarUrl: "",
@@ -20,10 +23,49 @@ export default function Settings() {
     githubHandle: "",
   });
 
+  const [errors, setErrors] = useState<ProfileValidationErrors>({});
+  const [successMessage, setSuccessMessage] = useState<string | null>(null);
   const [showPreview, setShowPreview] = useState(false);
 
-  const handleSave = () => {
-    // TODO: Call API to save profile
+  const { error: apiError, loading, callApi } = useApi<Profile>();
+
+  useEffect(() => {
+    let active = true;
+    const loadData = async () => {
+      try {
+        const data = await getProfile("john_doe");
+        if (active && data) {
+          setForm(data);
+        }
+      } catch (err) {
+        console.error("Failed to load profile settings", err);
+      }
+    };
+    loadData();
+    return () => {
+      active = false;
+    };
+  }, []);
+
+  const handleSave = async () => {
+    setSuccessMessage(null);
+    setErrors({});
+
+    const validation = validateProfile(form);
+    if (!validation.isValid) {
+      setErrors(validation.errors);
+      return;
+    }
+
+    try {
+      await callApi(() => saveProfile(form));
+      setSuccessMessage("Settings saved successfully!");
+      setTimeout(() => {
+        setSuccessMessage(null);
+      }, 5000);
+    } catch (err) {
+      console.error("Save profile error", err);
+    }
   };
 
   return (
@@ -118,6 +160,18 @@ export default function Settings() {
           </Link>
         </nav>
 
+        {successMessage && (
+          <div className="mb-6 p-4 rounded-xl bg-emerald-500/10 border border-emerald-500/20 text-emerald-400 text-sm font-semibold flex items-center gap-2 animate-in fade-in slide-in-from-top-4 duration-200">
+            <span>✓</span> {successMessage}
+          </div>
+        )}
+
+        {apiError && (
+          <div className="mb-6 p-4 rounded-xl bg-red-500/10 border border-red-500/20 text-red-400 text-sm font-semibold flex items-center gap-2 animate-in fade-in slide-in-from-top-4 duration-200">
+            <span>⚠️</span> {apiError}
+          </div>
+        )}
+
         <div className="grid grid-cols-1 lg:grid-cols-2 gap-4 sm:gap-6 lg:gap-8">
           {/* Settings Form */}
           <div className="space-y-4 sm:space-y-6">
@@ -151,6 +205,9 @@ export default function Settings() {
                       placeholder="#6366f1"
                     />
                   </div>
+                  {errors.primaryColor && (
+                    <p className="text-red-500 text-xs mt-1.5 font-medium">{errors.primaryColor}</p>
+                  )}
                 </div>
 
                 <div>
@@ -166,6 +223,9 @@ export default function Settings() {
                     className="w-full px-3 sm:px-4 py-2.5 sm:py-3 rounded-xl bg-white/5 border border-white/10 text-white text-sm sm:text-base"
                     placeholder="https://example.com/avatar.jpg"
                   />
+                  {errors.avatarUrl && (
+                    <p className="text-red-500 text-xs mt-1.5 font-medium">{errors.avatarUrl}</p>
+                  )}
                 </div>
 
                 <div>
@@ -183,6 +243,9 @@ export default function Settings() {
                   <p className="text-xs text-neutral-600 mt-1">
                     {form.bio.length}/160 characters
                   </p>
+                  {errors.bio && (
+                    <p className="text-red-500 text-xs mt-1.5 font-medium">{errors.bio}</p>
+                  )}
                 </div>
               </div>
             </div>
@@ -223,6 +286,9 @@ export default function Settings() {
                       maxLength={15}
                     />
                   </div>
+                  {errors.twitterHandle && (
+                    <p className="text-red-500 text-xs mt-1.5 font-medium">{errors.twitterHandle}</p>
+                  )}
                 </div>
 
                 <div>
@@ -239,6 +305,9 @@ export default function Settings() {
                     placeholder="user#1234"
                     maxLength={32}
                   />
+                  {errors.discordHandle && (
+                    <p className="text-red-500 text-xs mt-1.5 font-medium">{errors.discordHandle}</p>
+                  )}
                 </div>
 
                 <div>
@@ -255,6 +324,9 @@ export default function Settings() {
                     placeholder="stellar"
                     maxLength={39}
                   />
+                  {errors.githubHandle && (
+                    <p className="text-red-500 text-xs mt-1.5 font-medium">{errors.githubHandle}</p>
+                  )}
                 </div>
               </div>
             </div>
@@ -263,9 +335,17 @@ export default function Settings() {
             <div className="hidden sm:flex gap-3 sm:gap-4">
               <button
                 onClick={handleSave}
-                className="flex-1 px-4 sm:px-6 py-3 sm:py-4 bg-indigo-500 text-white font-bold rounded-xl hover:scale-105 active:scale-95 transition text-sm sm:text-base"
+                disabled={loading}
+                className="flex-1 px-4 sm:px-6 py-3 sm:py-4 bg-indigo-500 text-white font-bold rounded-xl hover:scale-105 active:scale-95 transition text-sm sm:text-base disabled:opacity-50 disabled:scale-100 disabled:cursor-not-allowed flex items-center justify-center gap-2"
               >
-                {t('saveChanges')}
+                {loading ? (
+                  <>
+                    <span className="w-4 h-4 border-2 border-white/30 border-t-white rounded-full animate-spin" />
+                    Saving...
+                  </>
+                ) : (
+                  t('saveChanges')
+                )}
               </button>
               <button
                 onClick={() => setShowPreview(!showPreview)}
@@ -307,9 +387,17 @@ export default function Settings() {
         <div className="flex gap-3">
           <button
             onClick={handleSave}
-            className="flex-1 px-4 py-3 bg-indigo-500 text-white font-bold rounded-xl active:scale-95 transition"
+            disabled={loading}
+            className="flex-1 px-4 py-3 bg-indigo-500 text-white font-bold rounded-xl active:scale-95 transition disabled:opacity-50 disabled:scale-100 disabled:cursor-not-allowed flex items-center justify-center gap-2"
           >
-            {t('saveChanges')}
+            {loading ? (
+              <>
+                <span className="w-4 h-4 border-2 border-white/30 border-t-white rounded-full animate-spin" />
+                Saving...
+              </>
+            ) : (
+              t('saveChanges')
+            )}
           </button>
           <button
             onClick={() => setShowPreview(!showPreview)}
diff --git a/app/frontend/src/app/settings/teams/page.tsx b/app/frontend/src/app/settings/teams/page.tsx
index c294510bc..b9e024087 100644
--- a/app/frontend/src/app/settings/teams/page.tsx
+++ b/app/frontend/src/app/settings/teams/page.tsx
@@ -2,6 +2,7 @@
 
 import { useState } from "react";
 import Link from "next/link";
+import { NetworkBadge } from "@/components/NetworkBadge";
 
 interface TeamMember {
   id: string;
@@ -56,6 +57,7 @@ export default function TeamSettings() {
 
   return (
     <div className="relative min-h-screen text-white">
+      <NetworkBadge />
       {/* Background glows */}
       <div className="fixed top-[-20%] left-[-30%] w-[60%] h-[60%] bg-indigo-500/10 blur-[120px] rounded-full" />
 
diff --git a/app/frontend/src/components/NetworkBadge.tsx b/app/frontend/src/components/NetworkBadge.tsx
index ed862f2e1..82100f5f7 100644
--- a/app/frontend/src/components/NetworkBadge.tsx
+++ b/app/frontend/src/components/NetworkBadge.tsx
@@ -27,7 +27,7 @@ export function NetworkBadge() {
 
   return (
     <div
-      className={`fixed top-4 left-60 px-3 py-1 rounded-full text-xs font-bold transition-all ${badgeStyles[normalized] || ""}`}
+      className={`fixed top-4 right-4 md:right-auto md:left-80 px-3 py-1 rounded-full text-xs font-bold transition-all z-50 ${badgeStyles[normalized] || ""}`}
     >
       {label}
 
diff --git a/app/frontend/src/hooks/useApi.ts b/app/frontend/src/hooks/useApi.ts
index 936125390..85630d431 100644
--- a/app/frontend/src/hooks/useApi.ts
+++ b/app/frontend/src/hooks/useApi.ts
@@ -14,6 +14,7 @@ export function useApi<T>() {
     try {
       const res = await fn();
       setData(res);
+      setError(null);
       return res;
     } catch (err: unknown) {
       const msg =
@@ -22,6 +23,7 @@ export function useApi<T>() {
           : "Something went wrong. Please try again.";
       setError(msg);
       console.error(err);
+      throw err;
     } finally {
       setLoading(false);
     }
diff --git a/app/frontend/src/lib/api.ts b/app/frontend/src/lib/api.ts
index ca7206011..442d90423 100644
--- a/app/frontend/src/lib/api.ts
+++ b/app/frontend/src/lib/api.ts
@@ -1,3 +1,5 @@
+import { Profile } from "@/types/profile";
+
 /**
  * Backend origin for browser calls. Override in `.env.local`:
  * `NEXT_PUBLIC_RustAcademy_API_URL=https://api.example.com`
@@ -5,3 +7,46 @@
 export const getRustAcademyApiBase = (): string =>
   process.env.NEXT_PUBLIC_RustAcademy_API_URL?.replace(/\/$/, "") ||
   "http://localhost:4000";
+
+/**
+ * Simulate API call to fetch a user profile, with localStorage fallback.
+ */
+export async function getProfile(username: string): Promise<Profile> {
+  // Simulate network latency
+  await new Promise((resolve) => setTimeout(resolve, 500));
+
+  if (typeof window !== "undefined") {
+    const stored = localStorage.getItem(`profile_${username}`);
+    if (stored) {
+      try {
+        return JSON.parse(stored) as Profile;
+      } catch (e) {
+        console.error("Failed to parse stored profile:", e);
+      }
+    }
+  }
+
+  // Return default profile
+  return {
+    username,
+    primaryColor: "#6366f1",
+    avatarUrl: "",
+    bio: "",
+    twitterHandle: "",
+    discordHandle: "",
+    githubHandle: "",
+  };
+}
+
+/**
+ * Simulate API call to save a user profile, persisting to localStorage.
+ */
+export async function saveProfile(profile: Profile): Promise<Profile> {
+  // Simulate network latency
+  await new Promise((resolve) => setTimeout(resolve, 800));
+
+  if (typeof window !== "undefined") {
+    localStorage.setItem(`profile_${profile.username}`, JSON.stringify(profile));
+  }
+  return profile;
+}
diff --git a/app/frontend/src/types/profile.ts b/app/frontend/src/types/profile.ts
new file mode 100644
index 000000000..c51514bda
--- /dev/null
+++ b/app/frontend/src/types/profile.ts
@@ -0,0 +1,80 @@
+export interface Profile {
+  username: string;
+  primaryColor: string;
+  avatarUrl: string;
+  bio: string;
+  twitterHandle: string;
+  discordHandle: string;
+  githubHandle: string;
+}
+
+export type ProfileValidationErrors = Partial<Record<keyof Profile, string>>;
+
+export function validateProfile(profile: Profile): { isValid: boolean; errors: ProfileValidationErrors } {
+  const errors: ProfileValidationErrors = {};
+
+  // Username validation
+  if (!profile.username) {
+    errors.username = "Username is required";
+  } else if (profile.username.length < 3 || profile.username.length > 32) {
+    errors.username = "Username must be between 3 and 32 characters";
+  } else if (!/^[a-z0-9_]+$/.test(profile.username)) {
+    errors.username = "Username must contain only lowercase letters, numbers, and underscores";
+  }
+
+  // Primary Color validation
+  if (!profile.primaryColor) {
+    errors.primaryColor = "Primary color is required";
+  } else if (!/^#[0-9a-fA-F]{6}$/.test(profile.primaryColor)) {
+    errors.primaryColor = "Must be a valid hex color code (e.g. #6366f1)";
+  }
+
+  // Avatar URL validation
+  if (profile.avatarUrl) {
+    try {
+      const url = new URL(profile.avatarUrl);
+      if (url.protocol !== "http:" && url.protocol !== "https:") {
+        errors.avatarUrl = "URL must use http or https protocol";
+      }
+    } catch {
+      errors.avatarUrl = "Must be a valid URL";
+    }
+  }
+
+  // Bio validation
+  if (profile.bio && profile.bio.length > 160) {
+    errors.bio = "Bio cannot exceed 160 characters";
+  }
+
+  // Twitter handle validation
+  if (profile.twitterHandle) {
+    if (profile.twitterHandle.length > 15) {
+      errors.twitterHandle = "Twitter handle cannot exceed 15 characters";
+    } else if (!/^[a-zA-Z0-9_]+$/.test(profile.twitterHandle)) {
+      errors.twitterHandle = "Twitter handle must contain only alphanumeric characters and underscores";
+    }
+  }
+
+  // Discord handle validation
+  if (profile.discordHandle) {
+    if (profile.discordHandle.length < 2 || profile.discordHandle.length > 32) {
+      errors.discordHandle = "Discord handle must be between 2 and 32 characters";
+    } else if (!/^[a-zA-Z0-9_.#]+$/.test(profile.discordHandle)) {
+      errors.discordHandle = "Discord handle must contain only alphanumeric characters, underscores, periods, and #";
+    }
+  }
+
+  // GitHub handle validation
+  if (profile.githubHandle) {
+    if (profile.githubHandle.length > 39) {
+      errors.githubHandle = "GitHub handle cannot exceed 39 characters";
+    } else if (!/^[a-zA-Z0-9](?:[a-zA-Z0-9]|-(?=[a-zA-Z0-9])){0,38}$/.test(profile.githubHandle)) {
+      errors.githubHandle = "Invalid GitHub handle format";
+    }
+  }
+
+  return {
+    isValid: Object.keys(errors).length === 0,
+    errors,
+  };
+}