diff --git a/packages/config-loader/src/lib/schema/compile.test.ts b/packages/config-loader/src/lib/schema/compile.test.ts
new file mode 100644
index 0000000000..91e7aa687e
--- /dev/null
+++ b/packages/config-loader/src/lib/schema/compile.test.ts
@@ -0,0 +1,114 @@
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { compileConfigSchemas } from './compile';
+
+describe('compileConfigSchemas', () => {
+  it('should merge schemas', () => {
+    const validate = compileConfigSchemas([
+      {
+        path: 'a',
+        value: { type: 'object', properties: { a: { type: 'string' } } },
+      },
+      {
+        path: 'b',
+        value: { type: 'object', properties: { b: { type: 'number' } } },
+      },
+    ]);
+    expect(validate([{ data: { a: 1 }, context: 'test' }])).toEqual({
+      errors: ['Config should be string { type=string } at .a'],
+      visibilityByPath: new Map(),
+    });
+    expect(validate([{ data: { b: 'b' }, context: 'test' }])).toEqual({
+      errors: ['Config should be number { type=number } at .b'],
+      visibilityByPath: new Map(),
+    });
+  });
+
+  it('should discover visibilities', () => {
+    const validate = compileConfigSchemas([
+      {
+        path: 'a1',
+        value: {
+          type: 'object',
+          properties: {
+            a: { type: 'string', visibility: 'frontend' },
+            b: { type: 'string', visibility: 'backend' },
+            c: { type: 'string' },
+            d: {
+              type: 'array',
+              visibility: 'secret',
+              items: { type: 'string', visibility: 'frontend' },
+            },
+          },
+        },
+      },
+      {
+        path: 'a2',
+        value: {
+          type: 'object',
+          properties: {
+            a: { type: 'string' },
+            b: { type: 'string', visibility: 'secret' },
+            c: { type: 'string', visibility: 'backend' },
+            d: {
+              type: 'array',
+              visibility: 'secret',
+              items: { type: 'string' },
+            },
+          },
+        },
+      },
+    ]);
+    expect(
+      validate([
+        { data: { a: 'a', b: 'b', c: 'c', d: ['d'] }, context: 'test' },
+      ]),
+    ).toEqual({
+      visibilityByPath: new Map(
+        Object.entries({
+          '.a': 'frontend',
+          '.b': 'secret',
+          '.d': 'secret',
+          '.d.0': 'frontend',
+        }),
+      ),
+    });
+  });
+
+  it('should reject visiblity conflicts', () => {
+    expect(() =>
+      compileConfigSchemas([
+        {
+          path: 'a1',
+          value: {
+            type: 'object',
+            properties: { a: { type: 'string', visibility: 'frontend' } },
+          },
+        },
+        {
+          path: 'a2',
+          value: {
+            type: 'object',
+            properties: { a: { type: 'string', visibility: 'secret' } },
+          },
+        },
+      ]),
+    ).toThrow(
+      "Config schema visibility is both 'frontend' and 'secret' for properties/a/visibility",
+    );
+  });
+});
diff --git a/packages/config-loader/src/lib/schema/compile.ts b/packages/config-loader/src/lib/schema/compile.ts
index 93ab8e978f..f01a4f640a 100644
--- a/packages/config-loader/src/lib/schema/compile.ts
+++ b/packages/config-loader/src/lib/schema/compile.ts
@@ -55,7 +55,7 @@ export function compileConfigSchemas(
         if (!dataPath) {
           return false;
         }
-        if (visibility) {
+        if (visibility && visibility !== 'backend') {
           const normalizedPath = dataPath.replace(
             /\['?(.*?)'?\]/g,
             (_, segment) => `.${segment}`,