diff --git a/jf-live-writer/include/LiveImageAssembler.hpp b/jf-live-writer/include/LiveImageAssembler.hpp
new file mode 100644
index 0000000..5bcb749
--- /dev/null
+++ b/jf-live-writer/include/LiveImageAssembler.hpp
@@ -0,0 +1,51 @@
+#ifndef SF_DAQ_BUFFER_LIVEIMAGEASSEMBLER_HPP
+#define SF_DAQ_BUFFER_LIVEIMAGEASSEMBLER_HPP
+
+#include <atomic>
+
+#include "buffer_config.hpp"
+#include "formats.hpp"
+
+const uint64_t IA_EMPTY_SLOT_VALUE = 0;
+
+struct ImageMetadata
+{
+    uint64_t pulse_id;
+    uint64_t frame_index;
+    uint32_t daq_rec;
+    uint8_t is_good_image;
+};
+
+class LiveImageAssembler {
+    const size_t n_modules_;
+    const size_t image_buffer_slot_n_bytes_;
+
+    char* image_buffer_;
+    ImageMetadata* image_meta_buffer_;
+    ModuleFrame* frame_meta_buffer_;
+    std::atomic_int* buffer_status_;
+    std::atomic_uint64_t* buffer_pulse_id_;
+
+    size_t get_data_offset(const uint64_t slot_id, const int i_module);
+    size_t get_frame_metadata_offset(const uint64_t slot_id, const int i_module);
+
+public:
+    LiveImageAssembler(const size_t n_modules);
+
+    virtual ~LiveImageAssembler();
+
+    bool is_slot_free(const uint64_t pulse_id);
+    bool is_slot_full(const uint64_t pulse_id);
+
+    void process(const uint64_t pulse_id,
+                 const int i_module,
+                 const BufferBinaryFormat* block_buffer);
+
+    void free_slot(const uint64_t pulse_id);
+
+    ImageMetadata* get_metadata_buffer(const uint64_t pulse_id);
+    char* get_data_buffer(const uint64_t pulse_id);
+};
+
+
+#endif //SF_DAQ_BUFFER_LIVEIMAGEASSEMBLER_HPP
diff --git a/jf-live-writer/src/LiveImageAssembler.cpp b/jf-live-writer/src/LiveImageAssembler.cpp
new file mode 100644
index 0000000..57cf48b
--- /dev/null
+++ b/jf-live-writer/src/LiveImageAssembler.cpp
@@ -0,0 +1,159 @@
+#include <cstring>
+
+#include "LiveImageAssembler.hpp"
+#include "buffer_config.hpp"
+#include "live_writer_config.hpp"
+
+using namespace std;
+using namespace buffer_config;
+using namespace live_writer_config;
+
+LiveImageAssembler::LiveImageAssembler(const size_t n_modules) :
+        n_modules_(n_modules),
+        image_buffer_slot_n_bytes_(MODULE_N_BYTES * n_modules_)
+{
+    image_buffer_ = new char[WRITER_IA_N_SLOTS * image_buffer_slot_n_bytes_];
+    image_meta_buffer_ = new ImageMetadata[WRITER_IA_N_SLOTS];
+    frame_meta_buffer_ = new ModuleFrame[WRITER_IA_N_SLOTS * n_modules];
+    buffer_status_ = new atomic_int[WRITER_IA_N_SLOTS];
+    buffer_pulse_id_ = new atomic_uint64_t[WRITER_IA_N_SLOTS];
+
+    for (size_t i=0; i < WRITER_IA_N_SLOTS; i++) {
+        free_slot(i);
+    }
+}
+
+LiveImageAssembler::~LiveImageAssembler()
+{
+    delete[] image_buffer_;
+    delete[] image_meta_buffer_;
+}
+
+bool LiveImageAssembler::is_slot_free(const uint64_t pulse_id)
+{
+    auto slot_id = pulse_id % WRITER_IA_N_SLOTS;
+
+    uint64_t slot_pulse_id = IA_EMPTY_SLOT_VALUE;
+    if (buffer_pulse_id_[slot_id].compare_exchange_strong(
+            slot_pulse_id, pulse_id)) {
+        return true;
+    }
+
+    auto is_free = buffer_status_[slot_id].load(memory_order_relaxed) > 0;
+    return is_free && (slot_pulse_id == pulse_id);
+}
+
+bool LiveImageAssembler::is_slot_full(const uint64_t pulse_id)
+{
+    auto slot_id = pulse_id % WRITER_IA_N_SLOTS;
+    return buffer_status_[slot_id].load(memory_order_relaxed) == 0;
+}
+
+size_t LiveImageAssembler::get_data_offset(
+        const uint64_t slot_id, const int i_module)
+{
+    size_t slot_i_offset = slot_id * image_buffer_slot_n_bytes_;
+    size_t module_i_offset = i_module * MODULE_N_BYTES;
+
+    return slot_i_offset + module_i_offset;
+}
+
+size_t LiveImageAssembler::get_frame_metadata_offset(
+        const uint64_t slot_id, const int i_module)
+{
+    size_t slot_m_offset = slot_id * n_modules_;
+    size_t module_m_offset = i_module;
+
+    return slot_m_offset + module_m_offset;
+}
+
+void LiveImageAssembler::process(
+        const uint64_t pulse_id,
+        const int i_module,
+        const BufferBinaryFormat* file_buffer)
+{
+    const auto slot_id = pulse_id % WRITER_IA_N_SLOTS;
+
+    auto frame_meta_offset = get_frame_metadata_offset(slot_id, i_module);
+    auto image_offset = get_data_offset(slot_id, i_module);
+
+    memcpy(
+            &(frame_meta_buffer_[frame_meta_offset]),
+            &(file_buffer->metadata),
+            sizeof(file_buffer->metadata));
+
+    memcpy(
+            image_buffer_ + image_offset,
+            &(file_buffer->data[0]),
+            MODULE_N_BYTES);
+
+    buffer_status_[slot_id].fetch_sub(1, memory_order_relaxed);
+}
+
+void LiveImageAssembler::free_slot(const uint64_t pulse_id)
+{
+    auto slot_id = pulse_id % WRITER_IA_N_SLOTS;
+    buffer_status_[slot_id].store(n_modules_, memory_order_relaxed);
+    buffer_pulse_id_[slot_id].store(IA_EMPTY_SLOT_VALUE, memory_order_relaxed);
+}
+
+ImageMetadata* LiveImageAssembler::get_metadata_buffer(const uint64_t pulse_id)
+{
+    const auto slot_id = pulse_id % WRITER_IA_N_SLOTS;
+
+    ImageMetadata& image_meta = image_meta_buffer_[slot_id];
+
+    auto frame_meta_offset = get_frame_metadata_offset(slot_id, 0);
+
+    auto is_pulse_init = false;
+    image_meta.is_good_image = 1;
+    image_meta.pulse_id = 0;
+
+    for (size_t i_module=0; i_module < n_modules_; i_module++) {
+
+        auto& frame_meta = frame_meta_buffer_[frame_meta_offset];
+        frame_meta_offset += 1;
+
+        auto is_good_frame =
+                frame_meta.n_recv_packets == JF_N_PACKETS_PER_FRAME;
+
+        if (!is_good_frame) {
+            image_meta.pulse_id = 0;
+            continue;
+        }
+
+        if (!is_pulse_init) {
+            image_meta.pulse_id = frame_meta.pulse_id;
+            image_meta.frame_index = frame_meta.frame_index;
+            image_meta.daq_rec = frame_meta.daq_rec;
+
+            is_pulse_init = true;
+        }
+
+        if (image_meta.is_good_image == 1) {
+            if (frame_meta.pulse_id != image_meta.pulse_id) {
+                image_meta.is_good_image = 0;
+            }
+
+            if (frame_meta.frame_index !=  image_meta.frame_index) {
+                image_meta.is_good_image = 0;
+            }
+
+            if (frame_meta.daq_rec != image_meta.daq_rec) {
+                image_meta.is_good_image = 0;
+            }
+
+            if (frame_meta.n_recv_packets != JF_N_PACKETS_PER_FRAME) {
+                image_meta.is_good_image = 0;
+            }
+        }
+    }
+
+    return &image_meta;
+}
+
+char* LiveImageAssembler::get_data_buffer(const uint64_t pulse_id)
+{
+    auto slot_id = pulse_id % WRITER_IA_N_SLOTS;
+    return image_buffer_ + (slot_id * image_buffer_slot_n_bytes_);
+}