diff --git a/backend/app/main.py b/backend/app/main.py
index 6a7866b..d4bb0fc 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -617,7 +617,40 @@ def get_checklists(
     query = db.query(models.Checklist)
     if active_only:
         query = query.filter(models.Checklist.is_active == True)
-    return query.offset(skip).limit(limit).all()
+    
+    # Si es mecánico, solo ver checklists con permiso
+    if current_user.role == "mechanic":
+        # Obtener IDs de checklists con permiso o sin permisos (acceso global)
+        permitted_checklist_ids = db.query(models.ChecklistPermission.checklist_id).filter(
+            models.ChecklistPermission.mechanic_id == current_user.id
+        ).distinct().all()
+        permitted_ids = [id[0] for id in permitted_checklist_ids]
+        
+        # Checklists sin permisos = acceso global
+        checklists_without_permissions = db.query(models.Checklist.id).outerjoin(
+            models.ChecklistPermission
+        ).group_by(models.Checklist.id).having(
+            func.count(models.ChecklistPermission.id) == 0
+        ).all()
+        global_ids = [id[0] for id in checklists_without_permissions]
+        
+        all_allowed_ids = list(set(permitted_ids + global_ids))
+        if all_allowed_ids:
+            query = query.filter(models.Checklist.id.in_(all_allowed_ids))
+        else:
+            # Si no hay permisos, devolver lista vacía
+            return []
+    
+    checklists = query.offset(skip).limit(limit).all()
+    
+    # Agregar allowed_mechanics a cada checklist
+    for checklist in checklists:
+        permissions = db.query(models.ChecklistPermission.mechanic_id).filter(
+            models.ChecklistPermission.checklist_id == checklist.id
+        ).all()
+        checklist.allowed_mechanics = [p[0] for p in permissions]
+    
+    return checklists
 
 
 @app.get("/api/checklists/{checklist_id}", response_model=schemas.ChecklistWithQuestions)
@@ -629,6 +662,12 @@ def get_checklist(checklist_id: int, db: Session = Depends(get_db)):
     if not checklist:
         raise HTTPException(status_code=404, detail="Checklist no encontrado")
     
+    # Agregar allowed_mechanics
+    permissions = db.query(models.ChecklistPermission.mechanic_id).filter(
+        models.ChecklistPermission.checklist_id == checklist.id
+    ).all()
+    checklist.allowed_mechanics = [p[0] for p in permissions]
+    
     return checklist
 
 
@@ -641,10 +680,28 @@ def create_checklist(
     if current_user.role != "admin":
         raise HTTPException(status_code=403, detail="No autorizado")
     
-    db_checklist = models.Checklist(**checklist.dict(), created_by=current_user.id)
+    # Extraer mechanic_ids antes de crear el checklist
+    checklist_data = checklist.dict(exclude={'mechanic_ids'})
+    mechanic_ids = checklist.mechanic_ids or []
+    
+    db_checklist = models.Checklist(**checklist_data, created_by=current_user.id)
     db.add(db_checklist)
+    db.flush()  # Para obtener el ID
+    
+    # Crear permisos para mecánicos seleccionados
+    for mechanic_id in mechanic_ids:
+        permission = models.ChecklistPermission(
+            checklist_id=db_checklist.id,
+            mechanic_id=mechanic_id
+        )
+        db.add(permission)
+    
     db.commit()
     db.refresh(db_checklist)
+    
+    # Agregar allowed_mechanics a la respuesta
+    db_checklist.allowed_mechanics = mechanic_ids
+    
     return db_checklist
 
 
@@ -662,11 +719,38 @@ def update_checklist(
     if not db_checklist:
         raise HTTPException(status_code=404, detail="Checklist no encontrado")
     
-    for key, value in checklist.dict(exclude_unset=True).items():
+    # Extraer mechanic_ids si se envía
+    update_data = checklist.dict(exclude_unset=True, exclude={'mechanic_ids'})
+    mechanic_ids = checklist.mechanic_ids
+    
+    # Actualizar campos del checklist
+    for key, value in update_data.items():
         setattr(db_checklist, key, value)
     
+    # Si se proporcionan mechanic_ids, actualizar permisos
+    if mechanic_ids is not None:
+        # Eliminar permisos existentes
+        db.query(models.ChecklistPermission).filter(
+            models.ChecklistPermission.checklist_id == checklist_id
+        ).delete()
+        
+        # Crear nuevos permisos
+        for mechanic_id in mechanic_ids:
+            permission = models.ChecklistPermission(
+                checklist_id=checklist_id,
+                mechanic_id=mechanic_id
+            )
+            db.add(permission)
+    
     db.commit()
     db.refresh(db_checklist)
+    
+    # Agregar allowed_mechanics a la respuesta
+    permissions = db.query(models.ChecklistPermission.mechanic_id).filter(
+        models.ChecklistPermission.checklist_id == checklist_id
+    ).all()
+    db_checklist.allowed_mechanics = [p[0] for p in permissions]
+    
     return db_checklist
 
 
diff --git a/backend/app/models.py b/backend/app/models.py
index ad81356..36fe47e 100644
--- a/backend/app/models.py
+++ b/backend/app/models.py
@@ -55,6 +55,7 @@ class Checklist(Base):
     creator = relationship("User", back_populates="checklists_created")
     questions = relationship("Question", back_populates="checklist", cascade="all, delete-orphan")
     inspections = relationship("Inspection", back_populates="checklist")
+    permissions = relationship("ChecklistPermission", back_populates="checklist", cascade="all, delete-orphan")
 
 
 class Question(Base):
@@ -186,3 +187,17 @@ class AIConfiguration(Base):
     is_active = Column(Boolean, default=True)
     created_at = Column(DateTime(timezone=True), server_default=func.now())
     updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+
+
+class ChecklistPermission(Base):
+    """Tabla intermedia para permisos de checklist por mecánico"""
+    __tablename__ = "checklist_permissions"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    checklist_id = Column(Integer, ForeignKey("checklists.id", ondelete="CASCADE"), nullable=False)
+    mechanic_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    
+    # Relationships
+    checklist = relationship("Checklist", back_populates="permissions")
+    mechanic = relationship("User")
diff --git a/backend/app/schemas.py b/backend/app/schemas.py
index 9fca46d..6ebc0b5 100644
--- a/backend/app/schemas.py
+++ b/backend/app/schemas.py
@@ -70,10 +70,11 @@ class ChecklistBase(BaseModel):
     logo_url: Optional[str] = None
 
 class ChecklistCreate(ChecklistBase):
-    pass
+    mechanic_ids: Optional[List[int]] = []  # IDs de mecánicos autorizados
 
 class ChecklistUpdate(ChecklistBase):
     is_active: Optional[bool] = None
+    mechanic_ids: Optional[List[int]] = None  # IDs de mecánicos autorizados
 
 class Checklist(ChecklistBase):
     id: int
@@ -81,6 +82,7 @@ class Checklist(ChecklistBase):
     is_active: bool
     created_by: int
     created_at: datetime
+    allowed_mechanics: Optional[List[int]] = []  # IDs de mecánicos permitidos
     
     class Config:
         from_attributes = True
diff --git a/backend/main2.py b/backend/main2.py
deleted file mode 100644
index 9b0b5ec..0000000
--- a/backend/main2.py
+++ /dev/null
@@ -1,122 +0,0 @@
-from fastapi import FastAPI, File, UploadFile, Form, Depends, HTTPException, status
-from fastapi.middleware.cors import CORSMiddleware
-from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
-from sqlalchemy.orm import Session, joinedload
-from sqlalchemy import func, case
-from typing import List, Optional
-import os
-import boto3
-from botocore.client import Config
-import uuid
-from app.core import config as app_config
-from app.core.database import engine, get_db, Base
-from app.core.security import verify_password, get_password_hash, create_access_token, decode_access_token
-from app import models, schemas
-import shutil
-from datetime import datetime, timedelta
-
-BACKEND_VERSION = "1.0.25"
-app = FastAPI(title="Checklist Inteligente API", version=BACKEND_VERSION)
-
-# S3/MinIO configuration
-S3_ENDPOINT = app_config.MINIO_ENDPOINT
-S3_ACCESS_KEY = app_config.MINIO_ACCESS_KEY
-S3_SECRET_KEY = app_config.MINIO_SECRET_KEY
-S3_IMAGE_BUCKET = app_config.MINIO_IMAGE_BUCKET
-S3_PDF_BUCKET = app_config.MINIO_PDF_BUCKET
-
-s3_client = boto3.client(
-    's3',
-    endpoint_url=S3_ENDPOINT,
-    aws_access_key_id=S3_ACCESS_KEY,
-    aws_secret_access_key=S3_SECRET_KEY,
-    config=Config(signature_version='s3v4'),
-    region_name='us-east-1'
-)
-
-# Crear tablas
-Base.metadata.create_all(bind=engine)
-
-# Información visual al iniciar el backend
-print("\n================ BACKEND STARTUP INFO ================")
-print(f"Backend version: {BACKEND_VERSION}")
-print(f"Database URL: {app_config.settings.DATABASE_URL}")
-print(f"Environment: {app_config.settings.ENVIRONMENT}")
-print(f"MinIO endpoint: {app_config.MINIO_ENDPOINT}")
-print("====================================================\n", flush=True)
-
-# CORS
-app.add_middleware(
-    CORSMiddleware,
-    allow_origins=["http://localhost:5173", "http://localhost:3000"],
-    allow_credentials=True,
-    allow_methods=["*"],
-    allow_headers=["*"],
-)
-
-# Simulación de modelos y autenticación para ejemplo
-class User:
-    def __init__(self, role):
-        self.role = role
-
-class AIConfiguration:
-    is_active = True
-    logo_url = ""
-
-class models:
-    User = User
-    AIConfiguration = AIConfiguration
-
-# Simulación de get_db y get_current_user
-
-def get_db():
-    # Aquí iría la lógica real de SQLAlchemy
-    class DummyDB:
-        def query(self, model):
-            return self
-        def filter(self, *args, **kwargs):
-            return self
-        def first(self):
-            return models.AIConfiguration()
-        def commit(self):
-            pass
-        def refresh(self, obj):
-            pass
-    return DummyDB()
-
-def get_current_user():
-    # Aquí iría la lógica real de autenticación
-    return models.User(role="admin")
-
-# Endpoint para subir el logo
-@app.post("/api/config/logo", response_model=dict)
-async def upload_logo(
-    file: UploadFile = File(...),
-    db: Session = Depends(get_db),
-    current_user: models.User = Depends(get_current_user)
-):
-    if current_user.role != "admin":
-        raise HTTPException(status_code=403, detail="Solo administradores pueden cambiar el logo")
-    # Subir imagen a MinIO/S3
-    file_extension = file.filename.split(".")[-1]
-    now = datetime.now()
-    folder = "logo"
-    file_name = f"logo_{now.strftime('%Y%m%d_%H%M%S')}.{file_extension}"
-    s3_key = f"{folder}/{file_name}"
-    # s3_client.upload_fileobj(file.file, S3_IMAGE_BUCKET, s3_key, ExtraArgs={"ContentType": file.content_type})
-    logo_url = f"https://minio.example.com/bucket/{s3_key}"  # Ajusta según tu config
-    # Actualiza la configuración en la base de datos
-    # config = db.query(models.AIConfiguration).filter(models.AIConfiguration.is_active == True).first()
-    # if config:
-    #     config.logo_url = logo_url
-    #     db.commit()
-    return {"logo_url": logo_url}
-
-# Endpoint para obtener el logo
-@app.get("/api/config/logo", response_model=dict)
-def get_logo_url(db: Session = Depends(get_db)):
-    # config = db.query(models.AIConfiguration).filter(models.AIConfiguration.is_active == True).first()
-    # if config and getattr(config, "logo_url", None):
-    #     return {"logo_url": config.logo_url}
-    # return {"logo_url": "https://minio.example.com/bucket/logo/default_logo.png"}
-    return {"logo_url": "https://minio.example.com/bucket/logo/default_logo.png"}
\ No newline at end of file
diff --git a/frontend/index.html b/frontend/index.html
index 99a1d1b..9557828 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -4,8 +4,8 @@
     <meta charset="UTF-8" />
     <link rel="icon" type="image/svg+xml" href="/vite.svg" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Syntria - Sistema Inteligente de Inspecciones</title>
-    <meta name="description" content="Syntria: Sistema avanzado de inspecciones vehiculares con inteligencia artificial" />
+    <title>AYUTEC - Sistema Inteligente de Inspecciones</title>
+    <meta name="description" content="AYUTEC: Sistema avanzado de inspecciones vehiculares con inteligencia artificial" />
   </head>
   <body>
     <div id="root"></div>
diff --git a/frontend/src/App.jsx b/frontend/src/App.jsx
index 6b2a026..46b94cf 100644
--- a/frontend/src/App.jsx
+++ b/frontend/src/App.jsx
@@ -106,7 +106,7 @@ function LoginPage({ setUser }) {
               <div className="w-24 h-24 bg-white rounded-2xl flex items-center justify-center shadow-lg text-gray-400">Sin logo</div>
             )}
           </div>
-          <h1 className="text-4xl font-bold text-white mb-2">Syntria</h1>
+          <h1 className="text-4xl font-bold text-white mb-2">AYUTEC</h1>
           <p className="text-indigo-100 text-sm">Sistema Inteligente de Inspecciones</p>
         </div>
 
@@ -296,7 +296,7 @@ function DashboardPage({ user, setUser }) {
                   <div className="w-12 h-12 bg-white rounded-xl flex items-center justify-center shadow-lg text-gray-400">Sin logo</div>
                 )}
                 <div>
-                  <h1 className="text-2xl font-bold text-white">Syntria</h1>
+                  <h1 className="text-2xl font-bold text-white">AYUTEC</h1>
                   <p className="text-xs text-indigo-200">Sistema Inteligente de Inspecciones</p>
                 </div>
               </div>
@@ -887,7 +887,7 @@ function APITokensTab({ user }) {
               Incluye el token en el header <code className="bg-blue-100 px-1 py-0.5 rounded">Authorization</code> de tus requests:
             </p>
             <code className="block bg-blue-100 p-2 rounded text-xs mt-2">
-              Authorization: Bearer syntria_tu_token_aqui
+              Authorization: Bearer AYUTEC_tu_token_aqui
             </code>
           </div>
         </div>
@@ -1346,13 +1346,39 @@ function ChecklistsTab({ checklists, user, onChecklistCreated, onStartInspection
   const [showQuestionsModal, setShowQuestionsModal] = useState(false)
   const [selectedChecklist, setSelectedChecklist] = useState(null)
   const [creating, setCreating] = useState(false)
+  const [mechanics, setMechanics] = useState([])
   const [formData, setFormData] = useState({
     name: '',
     description: '',
     ai_mode: 'off',
-    scoring_enabled: true
+    scoring_enabled: true,
+    mechanic_ids: []
   })
 
+  useEffect(() => {
+    loadMechanics()
+  }, [])
+
+  const loadMechanics = async () => {
+    try {
+      const token = localStorage.getItem('token')
+      const API_URL = import.meta.env.VITE_API_URL || ''
+      const response = await fetch(`${API_URL}/api/users`, {
+        headers: { 'Authorization': `Bearer ${token}` }
+      })
+      if (response.ok) {
+        const data = await response.json()
+        // Filtrar solo mecánicos activos
+        const mechanicUsers = data.filter(u => 
+          (u.role === 'mechanic' || u.role === 'mecanico') && u.is_active
+        )
+        setMechanics(mechanicUsers)
+      }
+    } catch (error) {
+      console.error('Error loading mechanics:', error)
+    }
+  }
+
   const handleCreate = async (e) => {
     e.preventDefault()
     setCreating(true)
@@ -1372,7 +1398,13 @@ function ChecklistsTab({ checklists, user, onChecklistCreated, onStartInspection
 
       if (response.ok) {
         setShowCreateModal(false)
-        setFormData({ name: '', description: '', ai_mode: 'off', scoring_enabled: true })
+        setFormData({ 
+          name: '', 
+          description: '', 
+          ai_mode: 'off', 
+          scoring_enabled: true,
+          mechanic_ids: []
+        })
         onChecklistCreated()
       } else {
         alert('Error al crear checklist')
@@ -1414,7 +1446,7 @@ function ChecklistsTab({ checklists, user, onChecklistCreated, onStartInspection
         checklists.map((checklist) => (
           <div key={checklist.id} className="border border-gray-200 rounded-lg p-4 hover:shadow-md transition">
             <div className="flex justify-between items-start">
-              <div>
+              <div className="flex-1">
                 <h3 className="text-lg font-semibold text-gray-900">{checklist.name}</h3>
                 <p className="text-sm text-gray-600 mt-1">{checklist.description}</p>
                 <div className="flex gap-4 mt-3 text-sm">
@@ -1425,6 +1457,22 @@ function ChecklistsTab({ checklists, user, onChecklistCreated, onStartInspection
                     Modo IA: <strong className="capitalize">{checklist.ai_mode}</strong>
                   </span>
                 </div>
+                {/* Mostrar permisos de mecánicos */}
+                {user.role === 'admin' && (
+                  <div className="mt-2">
+                    {!checklist.allowed_mechanics || checklist.allowed_mechanics.length === 0 ? (
+                      <span className="inline-flex items-center px-2 py-1 rounded-full text-xs font-medium bg-green-100 text-green-800">
+                        🌍 Acceso Global - Todos los mecánicos
+                      </span>
+                    ) : (
+                      <div className="flex items-center gap-2 flex-wrap">
+                        <span className="inline-flex items-center px-2 py-1 rounded-full text-xs font-medium bg-indigo-100 text-indigo-800">
+                          🔐 Restringido - {checklist.allowed_mechanics.length} mecánico{checklist.allowed_mechanics.length !== 1 ? 's' : ''}
+                        </span>
+                      </div>
+                    )}
+                  </div>
+                )}
               </div>
               <div className="flex gap-2">
                 {user.role === 'admin' && (
@@ -1558,6 +1606,65 @@ function ChecklistsTab({ checklists, user, onChecklistCreated, onStartInspection
                   </label>
                 </div>
 
+                {/* Selector de Mecánicos Autorizados */}
+                <div className="border-t pt-4">
+                  <label className="block text-sm font-medium text-gray-700 mb-2">
+                    🔐 Mecánicos Autorizados
+                  </label>
+                  <div className="bg-gray-50 border border-gray-300 rounded-lg p-3 max-h-48 overflow-y-auto">
+                    {mechanics.length === 0 ? (
+                      <p className="text-sm text-gray-500">No hay mecánicos disponibles</p>
+                    ) : (
+                      <div className="space-y-2">
+                        <div className="flex items-center pb-2 border-b">
+                          <input
+                            type="checkbox"
+                            checked={formData.mechanic_ids.length === 0}
+                            onChange={(e) => {
+                              if (e.target.checked) {
+                                setFormData({ ...formData, mechanic_ids: [] })
+                              }
+                            }}
+                            className="w-4 h-4 text-green-600 border-gray-300 rounded focus:ring-green-500"
+                          />
+                          <label className="ml-2 text-sm font-semibold text-green-700">
+                            🌍 Todos los mecánicos (acceso global)
+                          </label>
+                        </div>
+                        {mechanics.map((mechanic) => (
+                          <div key={mechanic.id} className="flex items-center">
+                            <input
+                              type="checkbox"
+                              checked={formData.mechanic_ids.includes(mechanic.id)}
+                              onChange={(e) => {
+                                if (e.target.checked) {
+                                  setFormData({ 
+                                    ...formData, 
+                                    mechanic_ids: [...formData.mechanic_ids, mechanic.id]
+                                  })
+                                } else {
+                                  setFormData({ 
+                                    ...formData, 
+                                    mechanic_ids: formData.mechanic_ids.filter(id => id !== mechanic.id)
+                                  })
+                                }
+                              }}
+                              className="w-4 h-4 text-indigo-600 border-gray-300 rounded focus:ring-indigo-500"
+                            />
+                            <label className="ml-2 text-sm text-gray-700">
+                              {mechanic.full_name || mechanic.username} ({mechanic.email})
+                            </label>
+                          </div>
+                        ))}
+                      </div>
+                    )}
+                  </div>
+                  <p className="mt-2 text-xs text-gray-500">
+                    💡 Si no seleccionas ningún mecánico, todos podrán usar este checklist. 
+                    Si seleccionas mecánicos específicos, solo ellos tendrán acceso.
+                  </p>
+                </div>
+
                 <div className="bg-yellow-50 border border-yellow-200 rounded-lg p-4 mt-4">
                   <p className="text-sm text-yellow-800">
                     ℹ️ Después de crear el checklist, podrás agregar preguntas desde la API o directamente en la base de datos.
@@ -1569,7 +1676,13 @@ function ChecklistsTab({ checklists, user, onChecklistCreated, onStartInspection
                     type="button"
                     onClick={() => {
                       setShowCreateModal(false)
-                      setFormData({ name: '', description: '', ai_mode: 'off', scoring_enabled: true })
+                      setFormData({ 
+                        name: '', 
+                        description: '', 
+                        ai_mode: 'off', 
+                        scoring_enabled: true,
+                        mechanic_ids: []
+                      })
                     }}
                     className="flex-1 px-4 py-2 border border-gray-300 text-gray-700 rounded-lg hover:bg-gray-50 transition"
                     disabled={creating}
diff --git a/migrations/add_checklist_permissions.sql b/migrations/add_checklist_permissions.sql
new file mode 100644
index 0000000..82f0622
--- /dev/null
+++ b/migrations/add_checklist_permissions.sql
@@ -0,0 +1,26 @@
+-- Migración: Agregar sistema de permisos por mecánico para checklists
+-- Fecha: 2025-11-25
+-- Descripción: Crea tabla intermedia para controlar qué mecánicos pueden usar cada checklist
+
+-- Crear tabla de permisos checklist-mecánico
+CREATE TABLE IF NOT EXISTS checklist_permissions (
+    id SERIAL PRIMARY KEY,
+    checklist_id INTEGER NOT NULL REFERENCES checklists(id) ON DELETE CASCADE,
+    mechanic_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    
+    -- Constraint para evitar duplicados
+    UNIQUE(checklist_id, mechanic_id)
+);
+
+-- Crear índices para mejorar rendimiento
+CREATE INDEX idx_checklist_permissions_checklist ON checklist_permissions(checklist_id);
+CREATE INDEX idx_checklist_permissions_mechanic ON checklist_permissions(mechanic_id);
+
+-- Comentarios para documentación
+COMMENT ON TABLE checklist_permissions IS 'Control de acceso de mecánicos a checklists. Si no hay registros para un checklist, todos los mecánicos tienen acceso.';
+COMMENT ON COLUMN checklist_permissions.checklist_id IS 'ID del checklist restringido';
+COMMENT ON COLUMN checklist_permissions.mechanic_id IS 'ID del mecánico autorizado';
+
+-- Verificar que la migración se ejecutó correctamente
+SELECT 'Tabla checklist_permissions creada exitosamente' AS status;