diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f6fe994
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,313 @@
+# Created by https://www.toptal.com/developers/gitignore/api/node,python
+# Edit at https://www.toptal.com/developers/gitignore?templates=node,python
+.coder
+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional stylelint cache
+.stylelintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+.temp
+
+# Docusaurus cache and generated files
+.docusaurus
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v2
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*
+
+### Node Patch ###
+# Serverless Webpack directories
+.webpack/
+
+# Optional stylelint cache
+
+# SvelteKit build / generate output
+.svelte-kit
+
+### Python ###
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
+
+### Python Patch ###
+# Poetry local configuration file - https://python-poetry.org/docs/configuration/#local-configuration
+poetry.toml
+
+# ruff
+.ruff_cache/
+
+# LSP config files
+pyrightconfig.json
+
+# End of https://www.toptal.com/developers/gitignore/api/node,python
diff --git a/frontend/.gitignore b/frontend/.gitignore
deleted file mode 100644
index 4cde958..0000000
--- a/frontend/.gitignore
+++ /dev/null
@@ -1,28 +0,0 @@
-# Logs
-logs
-*.log
-npm-debug.log*
-yarn-debug.log*
-yarn-error.log*
-pnpm-debug.log*
-lerna-debug.log*
-
-node_modules
-dist
-dist-ssr
-*.local
-
-# Editor directories and files
-.vscode/*
-!.vscode/extensions.json
-.idea
-.DS_Store
-*.suo
-*.ntvs*
-*.njsproj
-*.sln
-*.sw?
-
-# Codetyper.nvim - AI coding partner files
-*.coder.*
-.coder/
diff --git a/frontend/src/api/qrcode.ts b/frontend/src/api/qrcode.ts
new file mode 100644
index 0000000..40a8b11
--- /dev/null
+++ b/frontend/src/api/qrcode.ts
@@ -0,0 +1,27 @@
+import axios from 'axios';
+import type { GenerateResult } from '@types/qrcode';
+
+export async function generateQr(payload: { text: string; size: number }): Promise<GenerateResult> {
+  const url = 'http://localhost:5000/api/qrcode/generate';
+  const resp = await axios.post(url, payload, {
+    responseType: 'arraybuffer',
+    validateStatus: (s) => s >= 200 && s < 300,
+  });
+
+  const contentType = (resp.headers['content-type'] || '').toString();
+
+  // Try JSON parse in case backend returns { imageUrl }
+  try {
+    const decoded = new TextDecoder().decode(resp.data);
+    const parsed = JSON.parse(decoded);
+    if (parsed?.imageUrl) return { imageUrl: parsed.imageUrl };
+  } catch (error) {
+    console.error(error);
+  }
+
+  if (contentType.startsWith('image/')) {
+    return { mime: contentType, data: resp.data as ArrayBuffer };
+  }
+
+  return { mime: contentType || 'image/png', data: resp.data as ArrayBuffer };
+}
diff --git a/frontend/src/components/organisms/QRForm.tsx b/frontend/src/components/organisms/QRForm.tsx
index b1abb76..ff232d4 100644
--- a/frontend/src/components/organisms/QRForm.tsx
+++ b/frontend/src/components/organisms/QRForm.tsx
@@ -1,43 +1,40 @@
-import React, { useState } from 'react';
-import axios from 'axios';
+import React from 'react';
 import styles from '@styles/QRForm.module.scss';
+import { useQrStore } from '@store/qrStore';
+import { generateQr } from '@api/qrcode';
+import type { GenerateResult } from '@types/qrcode';
 
 const QRForm: React.FC = () => {
-  const [text, setText] = useState('');
-  const [size, setSize] = useState<'150' | '300' | '600'>('300');
-  const [loading, setLoading] = useState(false);
-  const [error, setError] = useState<string | null>(null);
-  const [imageUrl, setImageUrl] = useState<string | null>(null);
+  const { state, dispatch } = useQrStore();
+  const { text, size, loading } = state;
 
   const handleSubmit = async (e: React.FormEvent<HTMLFormElement>) => {
     e.preventDefault();
-    setError(null);
-    setImageUrl(null);
+    dispatch({ type: 'setError', payload: null });
+    dispatch({ type: 'setImageUrl', payload: null });
 
     if (!text.trim()) {
-      setError('Please enter a URL or text to encode.');
+      dispatch({ type: 'setError', payload: 'Please enter a URL or text to encode.' });
       return;
     }
 
-    setLoading(true);
+    dispatch({ type: 'setLoading', payload: true });
     try {
-      // Call a mock API to simulate server-side generation step.
-      // Using jsonplaceholder as a harmless mock endpoint.
-      await axios.post('https://jsonplaceholder.typicode.com/posts', {
-        payload: text,
-        size,
-      });
+      const res: GenerateResult = await generateQr({ text, size });
 
-      // Build a QR image URL using a public QR generator for preview purposes.
-      // In a real implementation the server would return the final image URL or binary data.
-      const generatedUrl = `https://api.qrserver.com/v1/create-qr-code/?size=${size}x${size}&data=${encodeURIComponent(
-        text
-      )}`;
-      setImageUrl(generatedUrl);
-    } catch (err) {
-      setError('Failed to generate QR code. Please try again.');
+      if ('imageUrl' in res && res.imageUrl) {
+        dispatch({ type: 'setImageUrl', payload: res.imageUrl });
+      } else if ('data' in res && res.data && res.mime) {
+        const blob = new Blob([res.data], { type: res.mime });
+        const objectUrl = URL.createObjectURL(blob);
+        dispatch({ type: 'setImageUrl', payload: objectUrl });
+      } else {
+        dispatch({ type: 'setError', payload: 'Unexpected server response' });
+      }
+    } catch {
+      dispatch({ type: 'setError', payload: 'Failed to generate QR code. Please try again.' });
     } finally {
-      setLoading(false);
+      dispatch({ type: 'setLoading', payload: false });
     }
   };
 
@@ -48,15 +45,15 @@ const QRForm: React.FC = () => {
         <input
           type="text"
           value={text}
-          onChange={(e) => setText(e.target.value)}
+          onChange={(e) => dispatch({ type: 'setText', payload: e.target.value })}
           placeholder="https://example.com or some text"
           className={styles.qrFormInput}
         />
 
         <label className={styles.qrFormLabel}>Image size</label>
         <select
-          value={size}
-          onChange={(e) => setSize(e.target.value as '150' | '300' | '600')}
+          value={String(size)}
+          onChange={(e) => dispatch({ type: 'setSize', payload: Number(e.target.value) })}
           className={styles.qrFormSelect}
         >
           <option value="150">Small — 150x150</option>
@@ -64,7 +61,7 @@ const QRForm: React.FC = () => {
           <option value="600">Large — 600x600</option>
         </select>
 
-        {error && <div className={styles.qrError}>{error}</div>}
+        {state.error && <div className={styles.qrError}>{state.error}</div>}
 
         <button type="submit" disabled={loading} className={styles.qrFormButton}>
           {loading ? 'Generating…' : 'Generate'}
diff --git a/frontend/src/components/organisms/QRImage.tsx b/frontend/src/components/organisms/QRImage.tsx
index 5aebd4d..204797d 100644
--- a/frontend/src/components/organisms/QRImage.tsx
+++ b/frontend/src/components/organisms/QRImage.tsx
@@ -1,23 +1,41 @@
-import React from 'react';
+import React, { useEffect, useRef } from 'react';
 import styles from '@styles/QRImage.module.scss';
+import { useQrStore } from '@store/qrStore';
 
-type Props = {
-  src?: string;
-  alt?: string;
-  filename?: string;
-};
+const QRImage: React.FC = () => {
+  const { state } = useQrStore();
+  const { imageUrl } = state;
+  const imgRef = useRef<HTMLImageElement | null>(null);
+  const prevObjectRef = useRef<string | null>(null);
 
-const QRImage = ({ src, alt = 'QR code', filename = 'qrcode.png' }: Props) => {
-  const imgRef = React.useRef<HTMLImageElement | null>(null);
+  useEffect(() => {
+    if (prevObjectRef.current && prevObjectRef.current.startsWith('blob:')) {
+      try {
+        URL.revokeObjectURL(prevObjectRef.current);
+      } catch {
+        // ignore
+      }
+    }
+    if (imageUrl && imageUrl.startsWith('blob:')) prevObjectRef.current = imageUrl;
+    else prevObjectRef.current = null;
+
+    return () => {
+      if (prevObjectRef.current && prevObjectRef.current.startsWith('blob:')) {
+        try {
+          URL.revokeObjectURL(prevObjectRef.current);
+        } catch {
+          // ignore
+        }
+      }
+    };
+  }, [imageUrl]);
 
   const handleDownload = () => {
     const img = imgRef.current;
-    if (!img || !img.src) {
-      return;
-    }
+    if (!img || !img.src) return;
     const link = document.createElement('a');
     link.href = img.src;
-    link.download = filename;
+    link.download = 'qrcode.png';
     document.body.appendChild(link);
     link.click();
     link.remove();
@@ -26,8 +44,8 @@ const QRImage = ({ src, alt = 'QR code', filename = 'qrcode.png' }: Props) => {
   return (
     <div className={styles.qrImageBody}>
       <div className={styles.qrImageContainer}>
-        {src ? (
-          <img ref={imgRef} src={src} alt={alt} className={styles.qrImg} />
+        {imageUrl ? (
+          <img ref={imgRef} src={imageUrl} alt="QR code" className={styles.qrImg} />
         ) : (
           <span className={styles.qrSpan}>No image</span>
         )}
diff --git a/frontend/src/main.tsx b/frontend/src/main.tsx
index c649296..26fe275 100644
--- a/frontend/src/main.tsx
+++ b/frontend/src/main.tsx
@@ -2,9 +2,12 @@ import { StrictMode } from 'react';
 import { createRoot } from 'react-dom/client';
 
 import App from './App.tsx';
+import { QrProvider } from '@src/store/qrStore';
 
 createRoot(document.getElementById('root')!).render(
   <StrictMode>
-    <App />
+    <QrProvider>
+      <App />
+    </QrProvider>
   </StrictMode>
 );
diff --git a/frontend/src/store/qrStore.tsx b/frontend/src/store/qrStore.tsx
new file mode 100644
index 0000000..1a4fda4
--- /dev/null
+++ b/frontend/src/store/qrStore.tsx
@@ -0,0 +1,56 @@
+import React, { createContext, useContext, useReducer } from 'react';
+
+export type QRState = {
+  text: string;
+  size: number;
+  imageUrl: string | null;
+  loading: boolean;
+  error: string | null;
+};
+
+type Action =
+  | { type: 'setText'; payload: string }
+  | { type: 'setSize'; payload: number }
+  | { type: 'setImageUrl'; payload: string | null }
+  | { type: 'setLoading'; payload: boolean }
+  | { type: 'setError'; payload: string | null };
+
+const initialState: QRState = {
+  text: '',
+  size: 300,
+  imageUrl: null,
+  loading: false,
+  error: null,
+};
+
+function reducer(state: QRState, action: Action): QRState {
+  switch (action.type) {
+    case 'setText':
+      return { ...state, text: action.payload };
+    case 'setSize':
+      return { ...state, size: action.payload };
+    case 'setImageUrl':
+      return { ...state, imageUrl: action.payload };
+    case 'setLoading':
+      return { ...state, loading: action.payload };
+    case 'setError':
+      return { ...state, error: action.payload };
+    default:
+      return state;
+  }
+}
+
+const QrContext = createContext<{ state: QRState; dispatch: React.Dispatch<Action> } | undefined>(
+  undefined
+);
+
+export const QrProvider: React.FC<{ children: React.ReactNode }> = ({ children }) => {
+  const [state, dispatch] = useReducer(reducer, initialState);
+  return <QrContext.Provider value={{ state, dispatch }}>{children}</QrContext.Provider>;
+};
+
+export function useQrStore() {
+  const ctx = useContext(QrContext);
+  if (!ctx) throw new Error('useQrStore must be used within QrProvider');
+  return ctx;
+}
diff --git a/frontend/src/types/qrcode.d.ts b/frontend/src/types/qrcode.d.ts
new file mode 100644
index 0000000..7771c86
--- /dev/null
+++ b/frontend/src/types/qrcode.d.ts
@@ -0,0 +1 @@
+export type GenerateResult = { imageUrl?: string } | { mime: string; data: ArrayBuffer };
diff --git a/frontend/tsconfig.json b/frontend/tsconfig.json
index bd17b8a..412f034 100644
--- a/frontend/tsconfig.json
+++ b/frontend/tsconfig.json
@@ -6,9 +6,10 @@
       "@/*": ["src/*"],
       "@src/*": ["src/*"],
       "@components/*": ["src/components/*"],
+      "@api/*": ["src/api/*"],
+      "@store/*": ["src/store/*"],
+      "@types/*": ["src/types/*"],
       "@styles/*": ["src/styles/*"],
-      "@atoms/*": ["src/components/atoms/*"],
-      "@molecules/*": ["src/components/molecules/*"],
       "@organisms/*": ["src/components/organisms/*"],
       "@templates/*": ["src/components/templates/*"]
     }