diff --git a/backend/src/layerController.ts b/backend/src/layerController.ts
new file mode 100644
index 0000000..6116a2d
--- /dev/null
+++ b/backend/src/layerController.ts
@@ -0,0 +1,132 @@
+import { FastifyRequest, FastifyReply } from 'fastify';
+import { DatabaseInterface } from './database/DatabaseInterface';
+import { getDatabase } from './database';
+
+// Type definitions
+interface Layer {
+  id: string;
+  project_id: string;
+  name: string;
+  visible: number;
+  locked: number;
+  color?: string;
+  line_type?: string;
+  transparency?: number;
+  sort_order: number;
+  created_at?: string;
+}
+
+// Get all layers for a project
+export async function getLayers(request: FastifyRequest, reply: FastifyReply) {
+  const db: DatabaseInterface = await getDatabase();
+  const projectId = (request.params as any).projectId;
+  
+  try {
+    const layers = await db.getLayers(projectId);
+    return layers;
+  } catch (error) {
+    request.log.error(error);
+    return reply.status(500).send({ error: 'Failed to fetch layers' });
+  }
+}
+
+// Create a new layer
+export async function createLayer(request: FastifyRequest, reply: FastifyReply) {
+  const db: DatabaseInterface = await getDatabase();
+  const projectId = (request.params as any).projectId;
+  const userId = (request.user as any).id;
+  const { name, visible, locked, color, line_type, transparency, sort_order } = request.body as Layer;
+  
+  // Generate a new ID for the layer
+  const layerId = Date.now().toString();
+  
+  try {
+    const newLayer = {
+      id: layerId,
+      project_id: projectId,
+      name: name || 'New Layer',
+      visible: visible !== undefined ? visible : 1,
+      locked: locked !== undefined ? locked : 0,
+      color: color || null,
+      line_type: line_type || null,
+      transparency: transparency !== undefined ? transparency : 0.0,
+      sort_order: sort_order !== undefined ? sort_order : 0,
+      created_at: new Date().toISOString()
+    };
+    
+    await db.createLayer(newLayer);
+    return reply.status(201).send(newLayer);
+  } catch (error) {
+    request.log.error(error);
+    return reply.status(500).send({ error: 'Failed to create layer' });
+  }
+}
+
+// Update a layer
+export async function updateLayer(request: FastifyRequest, reply: FastifyReply) {
+  const db: DatabaseInterface = await getDatabase();
+  const projectId = (request.params as any).projectId;
+  const layerId = (request.params as any).layerId;
+  const updateData = request.body as Partial<Layer>;
+  
+  try {
+    // Verify the layer belongs to the project
+    const existingLayer = await db.getLayerById(layerId);
+    if (!existingLayer || existingLayer.project_id !== projectId) {
+      return reply.status(404).send({ error: 'Layer not found' });
+    }
+    
+    // Update the layer
+    const updatedLayer = await db.updateLayer(layerId, updateData);
+    return updatedLayer;
+  } catch (error) {
+    request.log.error(error);
+    return reply.status(500).send({ error: 'Failed to update layer' });
+  }
+}
+
+// Delete a layer
+export async function deleteLayer(request: FastifyRequest, reply: FastifyReply) {
+  const db: DatabaseInterface = await getDatabase();
+  const projectId = (request.params as any).projectId;
+  const layerId = (request.params as any).layerId;
+  
+  try {
+    // Verify the layer belongs to the project
+    const existingLayer = await db.getLayerById(layerId);
+    if (!existingLayer || existingLayer.project_id !== projectId) {
+      return reply.status(404).send({ error: 'Layer not found' });
+    }
+    
+    // Delete the layer
+    await db.deleteLayer(layerId);
+    return reply.status(204).send();
+  } catch (error) {
+    request.log.error(error);
+    return reply.status(500).send({ error: 'Failed to delete layer' });
+  }
+}
+
+// Reorder layers
+export async function reorderLayers(request: FastifyRequest, reply: FastifyReply) {
+  const db: DatabaseInterface = await getDatabase();
+  const projectId = (request.params as any).projectId;
+  const { layerIds } = request.body as { layerIds: string[] };
+  
+  try {
+    // Update sort_order for each layer
+    for (let i = 0; i < layerIds.length; i++) {
+      const layerId = layerIds[i];
+      // Verify the layer belongs to the project
+      const existingLayer = await db.getLayerById(layerId);
+      if (existingLayer && existingLayer.project_id === projectId) {
+        await db.updateLayer(layerId, { sort_order: i });
+      }
+    }
+    
+    return { message: 'Layers reordered successfully' };
+  } catch (error) {
+    request.log.error(error);
+    return reply.status(500).send({ error: 'Failed to reorder layers' });
+  }
+}
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