diff --git a/lib/executor.js b/lib/executor.js
index 17fc02d..ab09c71 100644
--- a/lib/executor.js
+++ b/lib/executor.js
@@ -248,6 +248,12 @@ function defineModels(app, instructions) {
         if (typeof code === 'function') {
           debug('Customizing model %s', name);
           code(model);
+        // If code is a default UMD module use it
+        } else if (code.hasOwnProperty('default')) {
+          if (typeof code.default === 'function') {
+            debug('Customizing model %s', name);
+            code.default(model);
+          }
         } else {
           debug('Skipping model file %s - `module.exports` is not a function',
             data.sourceFile);
@@ -295,6 +301,15 @@ function runScripts(app, list, callback) {
           path: filepath,
           func: exports,
         });
+      // If the file contains a default UMD module, load it
+      } else if (exports.hasOwnProperty('default')) {
+        if (typeof exports.default === 'function') {
+          debug('Exported function detected %s', filepath);
+          functions.push({
+            path: filepath,
+            func: exports.default,
+          });
+        }
       }
     } catch (err) {
       g.error('Failed loading boot script: %s\n%s', filepath, err.stack);