diff --git a/image_handler.hpp b/image_handler.hpp
index f09e7a2..28675ce 100644
--- a/image_handler.hpp
+++ b/image_handler.hpp
@@ -1,8 +1,10 @@
 #pragma once
 
+#include <cstdint>
 #include <functional>
 #include <memory>
 #include <string>
+#include <vector>
 
 namespace blobs
 {
@@ -22,6 +24,16 @@
      * @return bool - returns true on success.
      */
     virtual bool open(const std::string& path) = 0;
+
+    /**
+     * write data to the staged file.
+     *
+     * @param[in] offset - 0-based offset into the file.
+     * @param[in] data - the data to write.
+     * @return bool - returns true on success.
+     */
+    virtual bool write(std::uint32_t offset,
+                       const std::vector<std::uint8_t>& data) = 0;
 };
 
 struct HandlerPack
diff --git a/static_handler.cpp b/static_handler.cpp
index 1d7e8e9..8cb20e0 100644
--- a/static_handler.cpp
+++ b/static_handler.cpp
@@ -1,7 +1,9 @@
 #include "static_handler.hpp"
 
+#include <cstdint>
 #include <memory>
 #include <string>
+#include <vector>
 
 namespace blobs
 {
@@ -12,4 +14,10 @@
     return false;
 }
 
+bool StaticLayoutHandler::write(std::uint32_t offset,
+                                const std::vector<std::uint8_t>& data)
+{
+    return false;
+}
+
 } // namespace blobs
diff --git a/static_handler.hpp b/static_handler.hpp
index d1cca08..65076d7 100644
--- a/static_handler.hpp
+++ b/static_handler.hpp
@@ -2,8 +2,10 @@
 
 #include "image_handler.hpp"
 
+#include <cstdint>
 #include <memory>
 #include <string>
+#include <vector>
 
 namespace blobs
 {
@@ -18,6 +20,9 @@
 
     bool open(const std::string& path) override;
 
+    bool write(std::uint32_t offset,
+               const std::vector<std::uint8_t>& data) override;
+
   private:
     std::string path;
 };
diff --git a/test/image_mock.hpp b/test/image_mock.hpp
index 4e615b1..6fbd87d 100644
--- a/test/image_mock.hpp
+++ b/test/image_mock.hpp
@@ -13,6 +13,7 @@
     virtual ~ImageHandlerMock() = default;
 
     MOCK_METHOD1(open, bool(const std::string&));
+    MOCK_METHOD2(write, bool(std::uint32_t, const std::vector<std::uint8_t>&));
 };
 
 } // namespace blobs