diff --git a/src/main/java/com/example/demo/service/DeveloperService.java b/src/main/java/com/example/demo/service/DeveloperService.java
new file mode 100644
index 0000000..8fde18e
--- /dev/null
+++ b/src/main/java/com/example/demo/service/DeveloperService.java
@@ -0,0 +1,37 @@
+package com.example.demo.service;
+
+import org.springframework.stereotype.Service;
+import java.util.List;
+import java.util.Map;
+import java.util.HashMap;
+
+@Service
+public class DeveloperService {
+
+    private final Map<String, String> roleMatrix = new HashMap<>();
+
+    public DeveloperService() {
+        roleMatrix.put("developer", "read-write");
+        roleMatrix.put("viewer", "read-only");
+        roleMatrix.put("admin", "full-access");
+    }
+
+    public String getRolePermission(String role) {
+        return roleMatrix.getOrDefault(role.toLowerCase(), "no-access");
+    }
+
+    public List<String> getAllRoles() {
+        return List.copyOf(roleMatrix.keySet());
+    }
+
+    public boolean hasPermission(String role, String requiredPermission) {
+        String permission = getRolePermission(role);
+        if ("full-access".equals(permission)) {
+            return true;
+        }
+        if ("read-write".equals(permission)) {
+            return !"delete".equals(requiredPermission);
+        }
+        return "read".equals(requiredPermission);
+    }
+}