diff --git a/mobile/src/App.tsx b/mobile/src/App.tsx
new file mode 100644
index 0000000..00ff3f4
--- /dev/null
+++ b/mobile/src/App.tsx
@@ -0,0 +1,74 @@
+import React, { useEffect } from 'react';
+import { Provider as ReduxProvider, useDispatch } from 'react-redux';
+import { PaperProvider } from 'react-native-paper';
+import { QueryClientProvider } from '@tanstack/react-query';
+import { SafeAreaProvider } from 'react-native-safe-area-context';
+import NetInfo from '@react-native-community/netinfo';
+import { Alert } from 'react-native';
+
+import { store } from './store';
+import { theme } from './theme';
+import { queryClient } from './lib/queryClient';
+import { RootNavigator } from './navigation/RootNavigator';
+import { tokenStorage, userStorage } from './lib/storage';
+import { setUser, setLoading } from './store/slices/authSlice';
+import { processOfflineQueue } from './hooks/useOfflineDraft';
+import { proposalsApi, CreateProposalRequest } from './lib/api/proposals';
+
+function AuthBootstrap({ children }: { children: React.ReactNode }) {
+  const dispatch = useDispatch();
+
+  useEffect(() => {
+    (async () => {
+      try {
+        const tokens = await tokenStorage.get();
+        const user = await userStorage.get();
+
+        if (tokens && user && new Date(tokens.expiresAt) > new Date()) {
+          dispatch(setUser(user));
+        } else {
+          if (tokens) await tokenStorage.clear();
+          dispatch(setLoading(false));
+        }
+      } catch {
+        dispatch(setLoading(false));
+      }
+    })();
+  }, [dispatch]);
+
+  useEffect(() => {
+    const unsubscribe = NetInfo.addEventListener((state) => {
+      if (state.isConnected) {
+        processOfflineQueue((data) =>
+          proposalsApi.create(data as CreateProposalRequest),
+        ).then((count) => {
+          if (count > 0) {
+            Alert.alert(
+              'Synced',
+              `${count} offline proposal${count > 1 ? 's' : ''} submitted.`,
+            );
+          }
+        });
+      }
+    });
+    return unsubscribe;
+  }, []);
+
+  return <>{children}</>;
+}
+
+export default function App() {
+  return (
+    <ReduxProvider store={store}>
+      <QueryClientProvider client={queryClient}>
+        <PaperProvider theme={theme}>
+          <SafeAreaProvider>
+            <AuthBootstrap>
+              <RootNavigator />
+            </AuthBootstrap>
+          </SafeAreaProvider>
+        </PaperProvider>
+      </QueryClientProvider>
+    </ReduxProvider>
+  );
+}
diff --git a/mobile/src/config.ts b/mobile/src/config.ts
new file mode 100644
index 0000000..2f6ed0a
--- /dev/null
+++ b/mobile/src/config.ts
@@ -0,0 +1,12 @@
+const Config = {
+  API_URL: __DEV__
+    ? 'http://localhost:5000/api'
+    : 'https://api.proposals.seahaven.com/api',
+  COGNITO_DOMAIN: 'proposal-system.auth.us-east-1.amazoncognito.com',
+  COGNITO_CLIENT_ID: '',
+  COGNITO_USER_POOL_ID: '',
+  COGNITO_REDIRECT_URI: 'com.seahavenind.proposals://auth/callback',
+  COGNITO_SCOPES: ['openid', 'email', 'profile'],
+};
+
+export default Config;
diff --git a/mobile/src/constants/index.ts b/mobile/src/constants/index.ts
new file mode 100644
index 0000000..1082a10
--- /dev/null
+++ b/mobile/src/constants/index.ts
@@ -0,0 +1,33 @@
+export const CACHE_TIME_SHORT = 2 * 60 * 1000;
+export const CACHE_TIME_MEDIUM = 5 * 60 * 1000;
+export const CACHE_TIME_LONG = 10 * 60 * 1000;
+
+export const STALE_TIME_SHORT = 1 * 60 * 1000;
+export const STALE_TIME_MEDIUM = 5 * 60 * 1000;
+export const STALE_TIME_LONG = 10 * 60 * 1000;
+
+export const DEFAULT_PAGE_SIZE = 12;
+export const DEFAULT_PAGE = 1;
+
+export const DEBOUNCE_SEARCH = 600;
+
+export const STORAGE_KEY_USER = 'proposal_system_user';
+export const KEYCHAIN_SERVICE = 'com.seahavenind.proposals';
+
+export const PROPOSAL_STATUSES = [
+  'Draft',
+  'InReview',
+  'Approved',
+  'Sent',
+  'Revised',
+] as const;
+
+export const SERVICE_CATEGORIES = [
+  'HVAC',
+  'Plumbing',
+  'Electrical',
+  'General',
+  'Renovation',
+] as const;
+
+export const PRIORITIES = ['Standard', 'Urgent', 'Emergency'] as const;
diff --git a/mobile/src/constants/queryKeys.ts b/mobile/src/constants/queryKeys.ts
new file mode 100644
index 0000000..08cfb08
--- /dev/null
+++ b/mobile/src/constants/queryKeys.ts
@@ -0,0 +1,9 @@
+export const QUERY_KEYS = {
+  proposals: 'proposals',
+  proposal: 'proposal',
+  proposalLineItems: 'proposalLineItems',
+  customers: 'customers',
+  users: 'users',
+  dashboard: 'dashboard',
+  auditTrail: 'auditTrail',
+} as const;
diff --git a/mobile/src/hooks/useAuth.ts b/mobile/src/hooks/useAuth.ts
new file mode 100644
index 0000000..40e8dc5
--- /dev/null
+++ b/mobile/src/hooks/useAuth.ts
@@ -0,0 +1,41 @@
+import { useCallback } from 'react';
+import { useSelector, useDispatch } from 'react-redux';
+import { Alert } from 'react-native';
+import {
+  selectUser,
+  selectIsAuthenticated,
+  selectAuthLoading,
+  selectAuthError,
+  logout as logoutAction,
+} from '../store/slices/authSlice';
+import { authApi } from '../lib/api/auth';
+import type { RootState } from '../store';
+
+export function useAuth() {
+  const dispatch = useDispatch();
+
+  const user = useSelector((state: RootState) => selectUser(state));
+  const isAuthenticated = useSelector((state: RootState) =>
+    selectIsAuthenticated(state),
+  );
+  const loading = useSelector((state: RootState) => selectAuthLoading(state));
+  const error = useSelector((state: RootState) => selectAuthError(state));
+
+  const logout = useCallback(async () => {
+    try {
+      await authApi.logout();
+    } catch {
+      // Best-effort
+    }
+    dispatch(logoutAction());
+    Alert.alert('Signed Out', 'You have been logged out.');
+  }, [dispatch]);
+
+  return {
+    user,
+    isAuthenticated,
+    loading,
+    error,
+    logout,
+  };
+}
diff --git a/mobile/src/hooks/useOfflineDraft.ts b/mobile/src/hooks/useOfflineDraft.ts
new file mode 100644
index 0000000..d7519f2
--- /dev/null
+++ b/mobile/src/hooks/useOfflineDraft.ts
@@ -0,0 +1,100 @@
+import { useEffect, useState, useCallback, useRef } from 'react';
+import AsyncStorage from '@react-native-async-storage/async-storage';
+import NetInfo from '@react-native-community/netinfo';
+
+const DRAFT_KEY = 'proposal_draft';
+const OFFLINE_QUEUE_KEY = 'proposal_offline_queue';
+
+export function useOfflineDraft<T extends Record<string, unknown>>(
+  initialData: T,
+) {
+  const [draft, setDraft] = useState<T>(initialData);
+  const [isLoaded, setIsLoaded] = useState(false);
+  const saveTimeout = useRef<ReturnType<typeof setTimeout>>();
+
+  useEffect(() => {
+    AsyncStorage.getItem(DRAFT_KEY).then((stored) => {
+      if (stored) {
+        try {
+          setDraft(JSON.parse(stored));
+        } catch {
+          // Corrupted draft, use initial data
+        }
+      }
+      setIsLoaded(true);
+    });
+  }, []);
+
+  const updateDraft = useCallback(
+    (updates: Partial<T>) => {
+      setDraft((prev) => {
+        const next = { ...prev, ...updates };
+        if (saveTimeout.current) clearTimeout(saveTimeout.current);
+        saveTimeout.current = setTimeout(() => {
+          AsyncStorage.setItem(DRAFT_KEY, JSON.stringify(next));
+        }, 1000);
+        return next;
+      });
+    },
+    [],
+  );
+
+  const clearDraft = useCallback(async () => {
+    if (saveTimeout.current) clearTimeout(saveTimeout.current);
+    await AsyncStorage.removeItem(DRAFT_KEY);
+    setDraft(initialData);
+  }, [initialData]);
+
+  return { draft, updateDraft, clearDraft, isLoaded };
+}
+
+interface QueuedSubmission {
+  data: unknown;
+  timestamp: string;
+}
+
+export async function queueOfflineSubmission(data: unknown): Promise<void> {
+  const stored = await AsyncStorage.getItem(OFFLINE_QUEUE_KEY);
+  const queue: QueuedSubmission[] = stored ? JSON.parse(stored) : [];
+  queue.push({ data, timestamp: new Date().toISOString() });
+  await AsyncStorage.setItem(OFFLINE_QUEUE_KEY, JSON.stringify(queue));
+}
+
+export async function processOfflineQueue(
+  submitFn: (data: unknown) => Promise<unknown>,
+): Promise<number> {
+  const state = await NetInfo.fetch();
+  if (!state.isConnected) return 0;
+
+  const stored = await AsyncStorage.getItem(OFFLINE_QUEUE_KEY);
+  if (!stored) return 0;
+
+  const queue: QueuedSubmission[] = JSON.parse(stored);
+  let processed = 0;
+
+  for (const item of queue) {
+    try {
+      await submitFn(item.data);
+      processed++;
+    } catch {
+      break;
+    }
+  }
+
+  if (processed === queue.length) {
+    await AsyncStorage.removeItem(OFFLINE_QUEUE_KEY);
+  } else if (processed > 0) {
+    await AsyncStorage.setItem(
+      OFFLINE_QUEUE_KEY,
+      JSON.stringify(queue.slice(processed)),
+    );
+  }
+
+  return processed;
+}
+
+export async function getOfflineQueueCount(): Promise<number> {
+  const stored = await AsyncStorage.getItem(OFFLINE_QUEUE_KEY);
+  if (!stored) return 0;
+  return JSON.parse(stored).length;
+}
diff --git a/mobile/src/hooks/usePaginatedList.ts b/mobile/src/hooks/usePaginatedList.ts
new file mode 100644
index 0000000..8d439df
--- /dev/null
+++ b/mobile/src/hooks/usePaginatedList.ts
@@ -0,0 +1,73 @@
+import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
+import { DEBOUNCE_SEARCH, DEFAULT_PAGE, DEFAULT_PAGE_SIZE } from '../constants';
+
+interface PaginatedResult<T> {
+  items: T[];
+  totalCount: number;
+}
+
+type FetchFn<T> = (
+  params: Record<string, unknown>,
+) => Promise<PaginatedResult<T>>;
+
+export function usePaginatedList<T>(
+  fetchFn: FetchFn<T>,
+  extraParams: Record<string, unknown> = {},
+) {
+  const [rows, setRows] = useState<T[]>([]);
+  const [search, setSearch] = useState('');
+  const [debouncedSearch, setDebouncedSearch] = useState('');
+  const [page, setPage] = useState(DEFAULT_PAGE);
+  const [pageSize, setPageSize] = useState(DEFAULT_PAGE_SIZE);
+  const [totalCount, setTotalCount] = useState(0);
+  const [loading, setLoading] = useState(true);
+  const [err, setErr] = useState('');
+  const debounceRef = useRef<ReturnType<typeof setTimeout> | null>(null);
+
+  const extraKey = JSON.stringify(extraParams);
+
+  useEffect(() => {
+    if (debounceRef.current) clearTimeout(debounceRef.current);
+    debounceRef.current = setTimeout(() => {
+      setDebouncedSearch(search);
+      setPage(1);
+    }, DEBOUNCE_SEARCH);
+    return () => {
+      if (debounceRef.current) clearTimeout(debounceRef.current);
+    };
+  }, [search]);
+
+  const reload = useCallback(() => {
+    setLoading(true);
+    setErr('');
+    fetchFn({ search: debouncedSearch, page, pageSize, ...extraParams })
+      .then(({ items, totalCount: total }) => {
+        setRows(items);
+        setTotalCount(total);
+      })
+      .catch((e: Error) => setErr(e.message || 'Failed to load'))
+      .finally(() => setLoading(false));
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [fetchFn, debouncedSearch, page, pageSize, extraKey]);
+
+  useEffect(() => {
+    reload();
+  }, [reload]);
+
+  return useMemo(
+    () => ({
+      rows,
+      search,
+      setSearch,
+      page,
+      setPage,
+      pageSize,
+      setPageSize,
+      totalCount,
+      loading,
+      err,
+      reload,
+    }),
+    [rows, search, page, pageSize, totalCount, loading, err, reload],
+  );
+}
diff --git a/mobile/src/lib/api/admin.ts b/mobile/src/lib/api/admin.ts
new file mode 100644
index 0000000..634c795
--- /dev/null
+++ b/mobile/src/lib/api/admin.ts
@@ -0,0 +1,76 @@
+import apiClient from './client';
+
+export interface DashboardStats {
+  pendingCount: number;
+  approvedThisWeek: number;
+  avgTurnaroundHours: number;
+  totalProposals: number;
+}
+
+export interface UpdateProposalRequest {
+  refinedScope?: string;
+  notes?: string;
+  assignedAdminId?: string;
+}
+
+export interface AuditEntry {
+  id: string;
+  proposalId: string | null;
+  userId: string;
+  userName: string;
+  action: string;
+  details: Record<string, unknown>;
+  timestamp: string;
+  ipAddress: string | null;
+}
+
+export const adminApi = {
+  getDashboard: async (): Promise<DashboardStats> => {
+    const res = await apiClient.get('/admin/dashboard');
+    return res.data;
+  },
+
+  updateProposal: async (
+    id: string,
+    data: UpdateProposalRequest,
+  ): Promise<void> => {
+    await apiClient.put(`/proposals/${id}`, data);
+  },
+
+  approveProposal: async (id: string): Promise<void> => {
+    await apiClient.post(`/proposals/${id}/approve`);
+  },
+
+  sendProposal: async (id: string): Promise<void> => {
+    await apiClient.post(`/proposals/${id}/send`);
+  },
+
+  reviseProposal: async (id: string): Promise<void> => {
+    await apiClient.post(`/proposals/${id}/revise`);
+  },
+
+  getAudit: async (id: string): Promise<AuditEntry[]> => {
+    const res = await apiClient.get(`/proposals/${id}/audit`);
+    return res.data;
+  },
+
+  generateSuggestions: async (id: string): Promise<void> => {
+    await apiClient.post(`/proposals/${id}/generate-suggestions`);
+  },
+
+  getSimilar: async (id: string): Promise<unknown[]> => {
+    const res = await apiClient.get(`/proposals/${id}/similar`);
+    return res.data;
+  },
+
+  getPdf: async (
+    id: string,
+  ): Promise<{ downloadUrl: string; expiresAt: string } | null> => {
+    try {
+      const res = await apiClient.get(`/proposals/${id}/pdf`);
+      return res.data;
+    } catch {
+      return null;
+    }
+  },
+};
diff --git a/mobile/src/lib/api/auth.ts b/mobile/src/lib/api/auth.ts
new file mode 100644
index 0000000..8ca649c
--- /dev/null
+++ b/mobile/src/lib/api/auth.ts
@@ -0,0 +1,78 @@
+import { authorize, refresh, revoke } from 'react-native-app-auth';
+import Config from '../../config';
+import apiClient from './client';
+import {
+  tokenStorage,
+  userStorage,
+  StoredTokens,
+  StoredUser,
+} from '../storage';
+
+const cognitoConfig = {
+  clientId: Config.COGNITO_CLIENT_ID,
+  redirectUrl: Config.COGNITO_REDIRECT_URI,
+  scopes: Config.COGNITO_SCOPES,
+  serviceConfiguration: {
+    authorizationEndpoint: `https://${Config.COGNITO_DOMAIN}/oauth2/authorize`,
+    tokenEndpoint: `https://${Config.COGNITO_DOMAIN}/oauth2/token`,
+    revocationEndpoint: `https://${Config.COGNITO_DOMAIN}/oauth2/revoke`,
+  },
+  usePKCE: true,
+  iosPrefersEphemeralSession: false,
+};
+
+export const authApi = {
+  login: async (): Promise<StoredUser> => {
+    const result = await authorize(cognitoConfig);
+
+    const tokens: StoredTokens = {
+      accessToken: result.accessToken,
+      idToken: result.idToken,
+      refreshToken: result.refreshToken,
+      expiresAt: result.accessTokenExpirationDate,
+    };
+    await tokenStorage.save(tokens);
+
+    const profile = await authApi.getMe();
+    await userStorage.save(profile);
+    return profile;
+  },
+
+  refreshTokens: async (): Promise<void> => {
+    const stored = await tokenStorage.get();
+    if (!stored?.refreshToken) throw new Error('No refresh token');
+
+    const result = await refresh(cognitoConfig, {
+      refreshToken: stored.refreshToken,
+    });
+
+    await tokenStorage.save({
+      accessToken: result.accessToken,
+      idToken: result.idToken || stored.idToken,
+      refreshToken: result.refreshToken || stored.refreshToken,
+      expiresAt: result.accessTokenExpirationDate,
+    });
+  },
+
+  logout: async (): Promise<void> => {
+    const stored = await tokenStorage.get();
+    if (stored?.accessToken) {
+      try {
+        await revoke(cognitoConfig, {
+          tokenToRevoke: stored.accessToken,
+          includeBasicAuth: false,
+          sendClientId: true,
+        });
+      } catch {
+        // Best-effort revocation
+      }
+    }
+    await tokenStorage.clear();
+    await userStorage.clear();
+  },
+
+  getMe: async (): Promise<StoredUser> => {
+    const res = await apiClient.get('/users/me');
+    return res.data;
+  },
+};
diff --git a/mobile/src/lib/api/client.ts b/mobile/src/lib/api/client.ts
new file mode 100644
index 0000000..22aa326
--- /dev/null
+++ b/mobile/src/lib/api/client.ts
@@ -0,0 +1,64 @@
+import axios from 'axios';
+import Config from '../../config';
+import { tokenStorage } from '../storage';
+
+const apiClient = axios.create({
+  baseURL: Config.API_URL,
+  headers: {
+    'Content-Type': 'application/json',
+    Accept: 'application/json',
+  },
+});
+
+apiClient.interceptors.request.use(
+  async (config) => {
+    const tokens = await tokenStorage.get();
+    if (tokens?.accessToken) {
+      config.headers.Authorization = `Bearer ${tokens.accessToken}`;
+    }
+    return config;
+  },
+  (error) => Promise.reject(error),
+);
+
+apiClient.interceptors.response.use(
+  (response) => response,
+  (error) => {
+    if (error.response) {
+      const { status, data } = error.response;
+
+      if (status === 401) {
+        tokenStorage.clear();
+        return Promise.reject(
+          new Error('Session expired. Please log in again.'),
+        );
+      }
+
+      if (status === 403) {
+        return Promise.reject(
+          new Error('You do not have permission to perform this action.'),
+        );
+      }
+
+      if (status === 404) {
+        return Promise.reject(
+          new Error('The requested resource was not found.'),
+        );
+      }
+
+      const message =
+        data?.detail || data?.title || data?.message || 'An error occurred';
+      return Promise.reject(new Error(message));
+    }
+
+    if (error.request) {
+      return Promise.reject(
+        new Error('No response from server. Please check your connection.'),
+      );
+    }
+
+    return Promise.reject(error);
+  },
+);
+
+export default apiClient;
diff --git a/mobile/src/lib/api/customers.ts b/mobile/src/lib/api/customers.ts
new file mode 100644
index 0000000..ca6f414
--- /dev/null
+++ b/mobile/src/lib/api/customers.ts
@@ -0,0 +1,24 @@
+import apiClient from './client';
+
+export interface Customer {
+  id: string;
+  name: string;
+  addresses: string[];
+  createdAt: string;
+}
+
+export const customersApi = {
+  search: async (query?: string): Promise<Customer[]> => {
+    const params = query ? `?query=${encodeURIComponent(query)}` : '';
+    const res = await apiClient.get(`/customers${params}`);
+    return res.data;
+  },
+
+  create: async (data: {
+    name: string;
+    addresses?: string[];
+  }): Promise<Customer> => {
+    const res = await apiClient.post('/customers', data);
+    return res.data;
+  },
+};
diff --git a/mobile/src/lib/api/lineItems.ts b/mobile/src/lib/api/lineItems.ts
new file mode 100644
index 0000000..a8f759c
--- /dev/null
+++ b/mobile/src/lib/api/lineItems.ts
@@ -0,0 +1,50 @@
+import apiClient from './client';
+import type { PricingMode, LineItemSource } from '@proposal-system/api-contracts';
+
+export interface LineItem {
+  id: string;
+  proposalId: string;
+  description: string;
+  quantity: number;
+  unit: string;
+  unitPrice: number | null;
+  totalPrice: number;
+  pricingMode: PricingMode;
+  sortOrder: number;
+  source: LineItemSource;
+  createdAt: string;
+  updatedAt: string;
+}
+
+export interface UpdateLineItemEntry {
+  id: string | null;
+  description: string;
+  quantity: number;
+  unit: string;
+  unitPrice: number | null;
+  totalPrice: number;
+  pricingMode: PricingMode;
+  sortOrder: number;
+  source: LineItemSource;
+}
+
+export const lineItemsApi = {
+  getAll: async (proposalId: string): Promise<LineItem[]> => {
+    const res = await apiClient.get(`/proposals/${proposalId}/line-items`);
+    return res.data;
+  },
+
+  bulkUpdate: async (
+    proposalId: string,
+    lineItems: UpdateLineItemEntry[],
+  ): Promise<LineItem[]> => {
+    const res = await apiClient.put(`/proposals/${proposalId}/line-items`, {
+      lineItems,
+    });
+    return res.data;
+  },
+
+  delete: async (proposalId: string, itemId: string): Promise<void> => {
+    await apiClient.delete(`/proposals/${proposalId}/line-items/${itemId}`);
+  },
+};
diff --git a/mobile/src/lib/api/proposals.ts b/mobile/src/lib/api/proposals.ts
new file mode 100644
index 0000000..39cc916
--- /dev/null
+++ b/mobile/src/lib/api/proposals.ts
@@ -0,0 +1,113 @@
+import apiClient from './client';
+import type { CreateProposalRequest } from '@proposal-system/api-contracts';
+
+export interface ProposalListItem {
+  id: string;
+  proposalNumber: string;
+  customerName: string;
+  workOrderNumber: string;
+  serviceCategory: string;
+  priority: string;
+  status: string;
+  totalBidAmount: number;
+  submittedAt: string;
+  submittedByName: string | null;
+  assignedAdminName: string | null;
+}
+
+export interface ProposalDetail {
+  id: string;
+  proposalNumber: string;
+  workOrderNumber: string;
+  customerName: string;
+  customerAddress: string;
+  scopeOfWork: string;
+  refinedScope: string | null;
+  serviceCategory: string;
+  priority: string;
+  status: string;
+  totalBidAmount: number;
+  vendorTotalCost: number | null;
+  notes: string;
+  submittedById: string;
+  submittedByName: string | null;
+  submittedAt: string;
+  assignedAdminId: string | null;
+  approvedById: string | null;
+  approvedAt: string | null;
+  sentAt: string | null;
+  currentRevision: number;
+  parentProposalId: string | null;
+  createdAt: string;
+  updatedAt: string;
+}
+
+export interface PagedResponse<T> {
+  items: T[];
+  totalCount: number;
+  page: number;
+  pageSize: number;
+}
+
+export interface ProposalFilters {
+  search?: string;
+  page?: number;
+  pageSize?: number;
+  status?: string;
+  serviceCategory?: string;
+  priority?: string;
+  fromDate?: string;
+  toDate?: string;
+}
+
+export interface ProposalStats {
+  totalCount: number;
+  inReviewCount: number;
+  approvedCount: number;
+  sentCount: number;
+}
+
+export { CreateProposalRequest };
+
+export const proposalsApi = {
+  create: async (data: CreateProposalRequest): Promise<ProposalDetail> => {
+    const res = await apiClient.post('/proposals', data);
+    return res.data;
+  },
+
+  getAll: async (
+    filters: ProposalFilters = {},
+  ): Promise<PagedResponse<ProposalListItem>> => {
+    const params = new URLSearchParams();
+    if (filters.search) params.append('search', filters.search);
+    if (filters.page) params.append('page', String(filters.page));
+    if (filters.pageSize) params.append('pageSize', String(filters.pageSize));
+    if (filters.status) params.append('status', filters.status);
+    if (filters.serviceCategory)
+      params.append('serviceCategory', filters.serviceCategory);
+    if (filters.priority) params.append('priority', filters.priority);
+
+    const res = await apiClient.get(`/proposals?${params.toString()}`);
+    return res.data;
+  },
+
+  getById: async (id: string): Promise<ProposalDetail> => {
+    const res = await apiClient.get(`/proposals/${id}`);
+    return res.data;
+  },
+
+  uploadAttachment: async (
+    proposalId: string,
+    fileName: string,
+  ): Promise<{ uploadUrl: string; s3Key: string }> => {
+    const res = await apiClient.post(
+      `/proposals/${proposalId}/attachments?fileName=${encodeURIComponent(fileName)}`,
+    );
+    return res.data;
+  },
+
+  getStats: async (): Promise<ProposalStats> => {
+    const res = await apiClient.get('/proposals/stats');
+    return res.data;
+  },
+};
diff --git a/mobile/src/lib/queryClient.ts b/mobile/src/lib/queryClient.ts
new file mode 100644
index 0000000..614a97e
--- /dev/null
+++ b/mobile/src/lib/queryClient.ts
@@ -0,0 +1,11 @@
+import { QueryClient } from '@tanstack/react-query';
+
+export const queryClient = new QueryClient({
+  defaultOptions: {
+    queries: {
+      staleTime: 5 * 60 * 1000,
+      gcTime: 10 * 60 * 1000,
+      retry: 1,
+    },
+  },
+});
diff --git a/mobile/src/lib/storage.ts b/mobile/src/lib/storage.ts
new file mode 100644
index 0000000..2acc5de
--- /dev/null
+++ b/mobile/src/lib/storage.ts
@@ -0,0 +1,67 @@
+import AsyncStorage from '@react-native-async-storage/async-storage';
+import * as Keychain from 'react-native-keychain';
+import { KEYCHAIN_SERVICE, STORAGE_KEY_USER } from '../constants';
+
+export interface StoredTokens {
+  accessToken: string;
+  idToken: string;
+  refreshToken: string;
+  expiresAt: string;
+}
+
+export interface StoredUser {
+  id: string;
+  email: string;
+  displayName: string;
+  role: 'Dispatcher' | 'Admin' | 'SysAdmin';
+}
+
+export const tokenStorage = {
+  save: async (tokens: StoredTokens): Promise<void> => {
+    await Keychain.setGenericPassword('tokens', JSON.stringify(tokens), {
+      service: KEYCHAIN_SERVICE,
+    });
+  },
+
+  get: async (): Promise<StoredTokens | null> => {
+    const result = await Keychain.getGenericPassword({
+      service: KEYCHAIN_SERVICE,
+    });
+    if (!result) return null;
+    try {
+      return JSON.parse(result.password);
+    } catch {
+      return null;
+    }
+  },
+
+  clear: async (): Promise<void> => {
+    await Keychain.resetGenericPassword({ service: KEYCHAIN_SERVICE });
+  },
+
+  isExpired: async (): Promise<boolean> => {
+    const tokens = await tokenStorage.get();
+    if (!tokens) return true;
+    return new Date(tokens.expiresAt) <= new Date();
+  },
+};
+
+export const userStorage = {
+  save: async (user: StoredUser): Promise<void> => {
+    await AsyncStorage.setItem(STORAGE_KEY_USER, JSON.stringify(user));
+  },
+
+  get: async (): Promise<StoredUser | null> => {
+    const data = await AsyncStorage.getItem(STORAGE_KEY_USER);
+    if (!data) return null;
+    try {
+      return JSON.parse(data);
+    } catch {
+      return null;
+    }
+  },
+
+  clear: async (): Promise<void> => {
+    await AsyncStorage.removeItem(STORAGE_KEY_USER);
+  },
+};
diff --git a/mobile/src/store/index.ts b/mobile/src/store/index.ts
new file mode 100644
index 0000000..00cafb7
--- /dev/null
+++ b/mobile/src/store/index.ts
@@ -0,0 +1,17 @@
+import { configureStore } from '@reduxjs/toolkit';
+import authReducer from './slices/authSlice';
+
+export const store = configureStore({
+  reducer: {
+    auth: authReducer,
+  },
+  middleware: (getDefaultMiddleware) =>
+    getDefaultMiddleware({
+      serializableCheck: {
+        ignoredActions: ['auth/setUser'],
+      },
+    }),
+});
+
+export type RootState = ReturnType<typeof store.getState>;
+export type AppDispatch = typeof store.dispatch;
diff --git a/mobile/src/store/slices/authSlice.ts b/mobile/src/store/slices/authSlice.ts
new file mode 100644
index 0000000..ede3d8d
--- /dev/null
+++ b/mobile/src/store/slices/authSlice.ts
@@ -0,0 +1,57 @@
+import { createSlice, PayloadAction } from '@reduxjs/toolkit';
+import type { StoredUser } from '../../lib/storage';
+
+interface AuthState {
+  user: StoredUser | null;
+  isAuthenticated: boolean;
+  loading: boolean;
+  error: string | null;
+}
+
+const initialState: AuthState = {
+  user: null,
+  isAuthenticated: false,
+  loading: true,
+  error: null,
+};
+
+const authSlice = createSlice({
+  name: 'auth',
+  initialState,
+  reducers: {
+    setUser: (state, action: PayloadAction<StoredUser>) => {
+      state.user = action.payload;
+      state.isAuthenticated = true;
+      state.loading = false;
+      state.error = null;
+    },
+    logout: (state) => {
+      state.user = null;
+      state.isAuthenticated = false;
+      state.error = null;
+    },
+    setLoading: (state, action: PayloadAction<boolean>) => {
+      state.loading = action.payload;
+    },
+    setError: (state, action: PayloadAction<string>) => {
+      state.error = action.payload;
+      state.loading = false;
+    },
+    clearError: (state) => {
+      state.error = null;
+    },
+  },
+});
+
+export const { setUser, logout, setLoading, setError, clearError } =
+  authSlice.actions;
+
+export const selectUser = (state: { auth: AuthState }) => state.auth.user;
+export const selectIsAuthenticated = (state: { auth: AuthState }) =>
+  state.auth.isAuthenticated;
+export const selectAuthLoading = (state: { auth: AuthState }) =>
+  state.auth.loading;
+export const selectAuthError = (state: { auth: AuthState }) =>
+  state.auth.error;
+
+export default authSlice.reducer;
diff --git a/mobile/src/theme/index.ts b/mobile/src/theme/index.ts
new file mode 100644
index 0000000..7d1b6e5
--- /dev/null
+++ b/mobile/src/theme/index.ts
@@ -0,0 +1,36 @@
+import { MD3LightTheme } from 'react-native-paper';
+
+export const theme = {
+  ...MD3LightTheme,
+  colors: {
+    ...MD3LightTheme.colors,
+    primary: '#1565C0',
+    primaryContainer: '#E3F2FD',
+    secondary: '#2E7D32',
+    secondaryContainer: '#E8F5E9',
+    tertiary: '#E65100',
+    tertiaryContainer: '#FFF3E0',
+    error: '#D32F2F',
+    errorContainer: '#FFEBEE',
+    background: '#FAFAFA',
+    surface: '#FFFFFF',
+    surfaceVariant: '#F5F5F5',
+    outline: '#BDBDBD',
+  },
+};
+
+export const statusColors: Record<string, string> = {
+  Draft: '#9E9E9E',
+  InReview: '#1565C0',
+  Approved: '#2E7D32',
+  Sent: '#7B1FA2',
+  Revised: '#E65100',
+};
+
+export const priorityColors: Record<string, string> = {
+  Standard: '#757575',
+  Urgent: '#E65100',
+  Emergency: '#D32F2F',
+};
+
+export type AppTheme = typeof theme;