diff --git a/backend/app/schemas.py b/backend/app/schemas.py
new file mode 100644
index 0000000..54e999c
--- /dev/null
+++ b/backend/app/schemas.py
@@ -0,0 +1,206 @@
+from datetime import datetime
+from typing import Optional
+from pydantic import BaseModel, EmailStr
+
+
+# --- Auth ---
+class UserCreate(BaseModel):
+    username: str
+    email: EmailStr
+    password: str
+
+
+class UserOut(BaseModel):
+    id: int
+    username: str
+    email: str
+    is_active: bool
+
+    model_config = {"from_attributes": True}
+
+
+class LoginRequest(BaseModel):
+    username: str
+    password: str
+
+
+# --- Config ---
+class ConfigCreate(BaseModel):
+    name: str
+    description: str = ""
+    is_active: bool = True
+
+
+class ConfigUpdate(BaseModel):
+    name: Optional[str] = None
+    description: Optional[str] = None
+    is_active: Optional[bool] = None
+
+
+class ConfigOut(BaseModel):
+    id: int
+    name: str
+    description: str
+    is_active: bool
+    created_at: datetime
+    updated_at: datetime
+    owner_id: int
+
+    model_config = {"from_attributes": True}
+
+
+# --- Zone ---
+class ZoneCreate(BaseModel):
+    name: str
+    type: str
+    options: str = ""
+
+
+class ZoneUpdate(BaseModel):
+    name: Optional[str] = None
+    type: Optional[str] = None
+    options: Optional[str] = None
+
+
+class ZoneOut(BaseModel):
+    id: int
+    config_id: int
+    name: str
+    type: str
+    options: str
+
+    model_config = {"from_attributes": True}
+
+
+# --- Interface ---
+class InterfaceCreate(BaseModel):
+    name: str
+    zone_id: int
+    options: str = ""
+
+
+class InterfaceUpdate(BaseModel):
+    name: Optional[str] = None
+    zone_id: Optional[int] = None
+    options: Optional[str] = None
+
+
+class InterfaceOut(BaseModel):
+    id: int
+    config_id: int
+    name: str
+    zone_id: int
+    options: str
+
+    model_config = {"from_attributes": True}
+
+
+# --- Policy ---
+class PolicyCreate(BaseModel):
+    src_zone_id: int
+    dst_zone_id: int
+    policy: str
+    log_level: str = ""
+    comment: str = ""
+    position: int = 0
+
+
+class PolicyUpdate(BaseModel):
+    src_zone_id: Optional[int] = None
+    dst_zone_id: Optional[int] = None
+    policy: Optional[str] = None
+    log_level: Optional[str] = None
+    comment: Optional[str] = None
+    position: Optional[int] = None
+
+
+class PolicyOut(BaseModel):
+    id: int
+    config_id: int
+    src_zone_id: int
+    dst_zone_id: int
+    policy: str
+    log_level: str
+    comment: str
+    position: int
+
+    model_config = {"from_attributes": True}
+
+
+# --- Rule ---
+class RuleCreate(BaseModel):
+    action: str
+    src_zone_id: Optional[int] = None
+    dst_zone_id: Optional[int] = None
+    src_ip: str = ""
+    dst_ip: str = ""
+    proto: str = ""
+    dport: str = ""
+    sport: str = ""
+    comment: str = ""
+    position: int = 0
+
+
+class RuleUpdate(BaseModel):
+    action: Optional[str] = None
+    src_zone_id: Optional[int] = None
+    dst_zone_id: Optional[int] = None
+    src_ip: Optional[str] = None
+    dst_ip: Optional[str] = None
+    proto: Optional[str] = None
+    dport: Optional[str] = None
+    sport: Optional[str] = None
+    comment: Optional[str] = None
+    position: Optional[int] = None
+
+
+class RuleOut(BaseModel):
+    id: int
+    config_id: int
+    action: str
+    src_zone_id: Optional[int]
+    dst_zone_id: Optional[int]
+    src_ip: str
+    dst_ip: str
+    proto: str
+    dport: str
+    sport: str
+    comment: str
+    position: int
+
+    model_config = {"from_attributes": True}
+
+
+# --- Masq ---
+class MasqCreate(BaseModel):
+    source_network: str
+    out_interface: str
+    to_address: str = ""
+    comment: str = ""
+
+
+class MasqUpdate(BaseModel):
+    source_network: Optional[str] = None
+    out_interface: Optional[str] = None
+    to_address: Optional[str] = None
+    comment: Optional[str] = None
+
+
+class MasqOut(BaseModel):
+    id: int
+    config_id: int
+    source_network: str
+    out_interface: str
+    to_address: str
+    comment: str
+
+    model_config = {"from_attributes": True}
+
+
+# --- Generate ---
+class GenerateOut(BaseModel):
+    zones: str
+    interfaces: str
+    policy: str
+    rules: str
+    masq: str