diff --git a/backend/internal/server/server.go b/backend/internal/server/server.go
index 18298a1..3c1d66c 100644
--- a/backend/internal/server/server.go
+++ b/backend/internal/server/server.go
@@ -228,32 +228,48 @@ func (s *Server) Start(ctx context.Context) error {
 		if err != nil {
 			log.Printf("Seeding admin user: %s", adminEmail)
 
-			company := &domain.Company{
-				ID:            uuid.Nil,
-				CNPJ:          "00000000000000",
-				CorporateName: "SaveInMed Platform",
-				Category:      "platform",
-				LicenseNumber: "ADMIN",
-				IsVerified:    true,
-				CreatedAt:     time.Now().UTC(),
-				UpdatedAt:     time.Now().UTC(),
-			}
-
-			err := s.svc.RegisterAccount(ctx, company, &domain.User{
-				Role:       domain.RoleAdmin,
-				Name:       bootstrapAdminName,
-				Username:   bootstrapAdminUsername,
-				Email:      adminEmail,
-				Superadmin: false,
-			}, adminPassword)
-
-			if err != nil {
-				log.Printf("Failed to seed admin: %v", err)
-			} else {
-				if _, err := s.svc.VerifyCompany(ctx, company.ID); err != nil {
-					log.Printf("Failed to verify platform company: %v", err)
+			// Reuse existing platform company if CNPJ already exists
+			var platformCompanyID uuid.UUID
+			if dbErr := s.db.QueryRowContext(ctx, `SELECT id FROM companies WHERE cnpj = $1 LIMIT 1`, "00000000000000").Scan(&platformCompanyID); dbErr != nil {
+				// Company doesn't exist — create it via RegisterAccount
+				company := &domain.Company{
+					ID:            uuid.Nil,
+					CNPJ:          "00000000000000",
+					CorporateName: "SaveInMed Platform",
+					Category:      "platform",
+					LicenseNumber: "ADMIN",
+					IsVerified:    true,
+					CreatedAt:     time.Now().UTC(),
+					UpdatedAt:     time.Now().UTC(),
+				}
+				if err := s.svc.RegisterAccount(ctx, company, &domain.User{
+					Role:       domain.RoleAdmin,
+					Name:       bootstrapAdminName,
+					Username:   bootstrapAdminUsername,
+					Email:      adminEmail,
+					Superadmin: false,
+				}, adminPassword); err != nil {
+					log.Printf("Failed to seed admin: %v", err)
+				} else {
+					if _, err := s.svc.VerifyCompany(ctx, company.ID); err != nil {
+						log.Printf("Failed to verify platform company: %v", err)
+					}
+					log.Printf("Admin user created: email=%s", adminEmail)
+				}
+			} else {
+				// Company exists — create user bound to it directly
+				if err := s.svc.CreateUser(ctx, &domain.User{
+					CompanyID:  platformCompanyID,
+					Role:       domain.RoleAdmin,
+					Name:       bootstrapAdminName,
+					Username:   bootstrapAdminUsername,
+					Email:      adminEmail,
+					Superadmin: false,
+				}, adminPassword); err != nil {
+					log.Printf("Failed to seed admin (existing company): %v", err)
+				} else {
+					log.Printf("Admin user created: email=%s", adminEmail)
 				}
-				log.Printf("Admin user created: email=%s", adminEmail)
 			}
 		} else {
 			existingUser.Role = domain.RoleAdmin