diff --git a/app/env_pro/core/profile.py b/app/env_pro/core/profile.py
new file mode 100644
index 0000000..2a38af3
--- /dev/null
+++ b/app/env_pro/core/profile.py
@@ -0,0 +1,151 @@
+"""Profile management for env-pro."""
+
+import os
+from pathlib import Path
+from typing import Optional, Dict, List
+from dotenv import dotenv_values
+
+
+class ProfileError(Exception):
+    """Base exception for profile errors."""
+    pass
+
+
+class ProfileNotFoundError(ProfileError):
+    """Raised when a profile is not found."""
+    pass
+
+
+def get_profiles_dir(project_root: Optional[Path] = None) -> Path:
+    """Get the profiles directory path."""
+    if project_root is None:
+        project_root = Path.cwd()
+    return project_root / ".env-profiles"
+
+
+def get_active_profile(project_root: Optional[Path] = None) -> Optional[str]:
+    """Get the currently active profile name."""
+    profiles_dir = get_profiles_dir(project_root)
+    active_file = profiles_dir / ".active"
+
+    if active_file.exists():
+        return active_file.read_text().strip()
+    return None
+
+
+def set_active_profile(profile_name: str, project_root: Optional[Path] = None):
+    """Set the active profile."""
+    profiles_dir = get_profiles_dir(project_root)
+    profiles_dir.mkdir(parents=True, exist_ok=True)
+
+    active_file = profiles_dir / ".active"
+    active_file.write_text(profile_name)
+
+
+def list_profiles(project_root: Optional[Path] = None) -> List[str]:
+    """List all available profiles."""
+    profiles_dir = get_profiles_dir(project_root)
+
+    if not profiles_dir.exists():
+        return []
+
+    profiles = []
+    for item in profiles_dir.iterdir():
+        if item.is_dir() and not item.name.startswith('.'):
+            profiles.append(item.name)
+    return sorted(profiles)
+
+
+def create_profile(profile_name: str, project_root: Optional[Path] = None):
+    """Create a new profile."""
+    profiles_dir = get_profiles_dir(project_root)
+    profile_dir = profiles_dir / profile_name
+
+    if profile_dir.exists():
+        raise ProfileError(f"Profile '{profile_name}' already exists")
+
+    profile_dir.mkdir(parents=True, exist_ok=True)
+    env_file = profile_dir / ".env"
+    env_file.write_text("")
+
+    return profile_dir
+
+
+def delete_profile(profile_name: str, project_root: Optional[Path] = None):
+    """Delete a profile."""
+    profiles_dir = get_profiles_dir(project_root)
+    profile_dir = profiles_dir / profile_name
+
+    if not profile_dir.exists():
+        raise ProfileNotFoundError(f"Profile '{profile_name}' not found")
+
+    import shutil
+    shutil.rmtree(profile_dir)
+
+
+def get_profile_vars(profile_name: str, project_root: Optional[Path] = None) -> Dict[str, str]:
+    """Get all variables for a profile."""
+    profiles_dir = get_profiles_dir(project_root)
+    env_file = profiles_dir / profile_name / ".env"
+
+    if not env_file.exists():
+        raise ProfileNotFoundError(f"Profile '{profile_name}' not found")
+
+    vars = dotenv_values(env_file)
+    return {k: v for k, v in vars.items() if v is not None}
+
+
+def set_profile_var(profile_name: str, key: str, value: str, project_root: Optional[Path] = None):
+    """Set a variable in a profile."""
+    profiles_dir = get_profiles_dir(project_root)
+    env_file = profiles_dir / profile_name / ".env"
+
+    if not env_file.exists():
+        raise ProfileNotFoundError(f"Profile '{profile_name}' not found")
+
+    vars = dotenv_values(env_file)
+    vars[key] = value
+
+    with open(env_file, 'w') as f:
+        for k, v in vars.items():
+            if v is not None:
+                f.write(f"{k}={v}\n")
+
+
+def delete_profile_var(profile_name: str, key: str, project_root: Optional[Path] = None):
+    """Delete a variable from a profile."""
+    profiles_dir = get_profiles_dir(project_root)
+    env_file = profiles_dir / profile_name / ".env"
+
+    if not env_file.exists():
+        raise ProfileNotFoundError(f"Profile '{profile_name}' not found")
+
+    vars = dotenv_values(env_file)
+    if key in vars:
+        del vars[key]
+
+    with open(env_file, 'w') as f:
+        for k, v in vars.items():
+            if v is not None:
+                f.write(f"{k}={v}\n")
+
+
+def init_project(project_root: Optional[Path] = None):
+    """Initialize env-pro in a project directory."""
+    profiles_dir = get_profiles_dir(project_root)
+
+    if profiles_dir.exists():
+        return profiles_dir
+
+    profiles_dir.mkdir(parents=True, exist_ok=True)
+
+    default_profile = profiles_dir / "default"
+    default_profile.mkdir()
+
+    default_env = default_profile / ".env"
+    default_env.write_text("")
+
+    active_file = profiles_dir / ".active"
+    active_file.write_text("default")
+
+    return profiles_dir