diff --git a/backend/entities/clients.go b/backend/entities/clients.go
new file mode 100644
index 0000000..24e51eb
--- /dev/null
+++ b/backend/entities/clients.go
@@ -0,0 +1,53 @@
+package entities
+
+import "fmt"
+
+const SERVER_VERSION = 1
+
+type Client interface {
+	GetClientVersion() int
+}
+
+func NewClient(clientVersion int) (error, Client) {
+
+	isCompatible := ServerClientIsCompatibleWithClient(clientVersion)
+
+	if !isCompatible {
+		return fmt.Errorf("You client version %n is not compatible with the server verison %n", clientVersion, SERVER_VERSION), nil
+	}
+
+	client := ClientVerisonOne{
+		Version: clientVersion,
+	}
+
+	return nil, &client
+
+}
+
+func ServerClientIsCompatibleWithClient(clientVersion int) bool {
+
+	switch clientVersion {
+	case 1:
+
+		serverCompatibleVersion := []int{1}
+
+		for _, serverVersion := range serverCompatibleVersion {
+			if serverVersion == clientVersion {
+				return true
+			}
+		}
+
+		return false
+	default:
+		return false
+	}
+
+}
+
+type ClientVerisonOne struct {
+	Version int
+}
+
+func (c *ClientVerisonOne) GetClientVersion() int {
+	return c.Version
+}
diff --git a/backend/entities/documents.go b/backend/entities/documents.go
index 162585c..6048da9 100644
--- a/backend/entities/documents.go
+++ b/backend/entities/documents.go
@@ -5,10 +5,11 @@ import (
 )
 
 type Document struct {
-	DocumentUUID         *string
-	DocumentType         int
-	DocumentName         *string
-	DocumentOriginalName string
+	UUID         *string
+	Type         int
+	Name         *string
+	OriginalName string
+	Version      int
 }
 
 const (
@@ -36,7 +37,7 @@ func IsDirectory(documentType int) bool {
 	return DIRECTORY == documentType
 }
 
-func NewDocument(documentName string, documentType int) (error, *Document) {
+func NewDocument(documentName string, documentType int, documentVersion int) (error, *Document) {
 
 	documentTypeIsValid := IsDocumentTypeValid(documentType)
 
@@ -45,24 +46,25 @@ func NewDocument(documentName string, documentType int) (error, *Document) {
 	}
 
 	return nil, &Document{
-		DocumentName: &documentName,
-		DocumentType: documentType,
+		Name:    &documentName,
+		Type:    documentType,
+		Version: documentVersion,
 	}
 
 }
 
 func (d *Document) GetOriginalName() *string {
 
-	return &d.DocumentOriginalName
+	return &d.OriginalName
 
 }
 
 func (d *Document) GetName() *string {
 
-	if d.DocumentName == nil {
+	if d.Name == nil {
 		return d.GetOriginalName()
 	}
 
-	return d.DocumentName
+	return d.Name
 
 }
diff --git a/backend/services/folders.go b/backend/services/folders.go
new file mode 100644
index 0000000..2903e3b
--- /dev/null
+++ b/backend/services/folders.go
@@ -0,0 +1,14 @@
+package services
+
+import "github.com/vaultdrop/backend/entities"
+
+func (s *Services) CreateFolder(folderName string, destination *entities.Document) (error, *entities.Document) {
+
+	err, directory := entities.NewDocument(folderName, entities.DIRECTORY)
+	if err != nil {
+		return err, nil
+	}
+
+	return nil, directory
+
+}
diff --git a/backend/services/upload.go b/backend/services/upload.go
index 864a17f..448a905 100644
--- a/backend/services/upload.go
+++ b/backend/services/upload.go
@@ -1,5 +1,19 @@
 package services
 
-func (s *Services) UploadDocument() {
+import (
+	"fmt"
+
+	"github.com/vaultdrop/backend/entities"
+)
+
+func (s *Services) UploadDocument(file *string, destination *entities.Document) error {
+
+	if canEdit, _ := UserCanEditDocument(s.ConnectedUser, destination); !canEdit {
+		return fmt.Errorf("Can not edit")
+	}
+
+	entities.NewDocument("test", entities.FILE)
+
+	return nil
 
 }