diff --git a/CMakeLists.txt b/CMakeLists.txt
index f969e0c6..c37da694 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -44,6 +44,8 @@ endif()
 
 find_package(MPI REQUIRED)
 
+option(ASTE_USE_ASTE_JOINER_CPP "Use C++ implementation of precice-aste-join" OFF)
+
 add_executable(precice-aste-run src/precice-aste-run.cpp src/common.cpp src/mesh.cpp src/configreader.cpp src/modes.cpp src/utilities.cpp src/logger.cpp)
 target_include_directories(precice-aste-run PRIVATE src thirdparty)
 target_link_libraries(precice-aste-run
@@ -62,6 +64,14 @@ if(METIS_FOUND)
   target_link_libraries(precice-aste-run metisAPI)
 endif()
 
+if(ASTE_USE_ASTE_JOINER_CPP)
+add_executable(precice-aste-join src/precice-aste-join.cpp)
+target_include_directories(precice-aste-join PRIVATE src thirdparty)
+target_link_libraries(precice-aste-join
+  ${Boost_LIBRARIES}
+  ${VTK_LIBRARIES}
+)
+endif()
 
 add_executable(testing tests/testing.cpp tests/read_test.cpp tests/write_test.cpp src/mesh.cpp src/logger.cpp)
 target_include_directories(testing PRIVATE src thirdparty)
@@ -77,13 +87,15 @@ if (VTK_VERSION VERSION_LESS "8.90.0")
 else ()
   # vtk_module_autoinit is needed
   vtk_module_autoinit(
-    TARGETS precice-aste-run testing
+    TARGETS precice-aste-run testing precice-aste-join
     MODULES ${VTK_LIBRARIES}
     )
 endif()
 
 file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/src/precice-aste-partition      DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
+if(NOT ASTE_USE_ASTE_JOINER_CPP)
 file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/src/precice-aste-join           DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
+endif()
 file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/src/precice-aste-evaluate      DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
 
 include(GNUInstallDirs)
@@ -91,7 +103,12 @@ install(TARGETS precice-aste-run DESTINATION ${CMAKE_INSTALL_BINDIR})
 if(METIS_FOUND)
 install(TARGETS metisAPI DESTINATION ${CMAKE_INSTALL_LIBDIR})
 endif()
+if(ASTE_USE_ASTE_JOINER_CPP)
+install(TARGETS precice-aste-join DESTINATION ${CMAKE_INSTALL_BINDIR})
+install(PROGRAMS ${CMAKE_CURRENT_SOURCE_DIR}/src/precice-aste-partition ${CMAKE_CURRENT_SOURCE_DIR}/src/precice-aste-evaluate DESTINATION ${CMAKE_INSTALL_BINDIR})
+else()
 install(PROGRAMS ${CMAKE_CURRENT_SOURCE_DIR}/src/precice-aste-partition ${CMAKE_CURRENT_SOURCE_DIR}/src/precice-aste-join ${CMAKE_CURRENT_SOURCE_DIR}/src/precice-aste-evaluate DESTINATION ${CMAKE_INSTALL_BINDIR})
+endif()
 
 enable_testing()
 
diff --git a/src/precice-aste-join.cpp b/src/precice-aste-join.cpp
new file mode 100644
index 00000000..3fa0a4c8
--- /dev/null
+++ b/src/precice-aste-join.cpp
@@ -0,0 +1,323 @@
+#include "precice-aste-join.hpp"
+
+auto getOptions(int argc, char *argv[]) -> OptionMap
+{
+  namespace po = boost::program_options;
+
+  // Declare the supported options.
+  po::options_description desc("Allowed options");
+  desc.add_options()("help", "produce help message")("mesh,m", po::value<std::string>(), "The partitioned mesh prefix used as input (only VTU format is accepted)(Looking for <prefix>_<#filerank>.vtu).")("output,o", po::value<std::string>(), "The output mesh. Can be VTK or VTU format. If it is not given <inputmesh>_joined.vtk will be used.")("recovery,r", po::value<std::string>(), "The path to the recovery file to fully recover it's state.")("numparts,n", po::value<size_t>()->default_value(0), "The number of parts to read from the input mesh. By default the entire mesh is read.")("directory,dir", po::value<std::string>()->default_value("."), "Directory for output files (optional)");
+
+  po::variables_map vm;
+  try {
+    po::store(parse_command_line(argc, argv, desc), vm);
+
+    if (vm.count("help")) {
+      std::cout << desc << std::endl;
+      std::exit(EXIT_SUCCESS);
+    }
+    // Needs to be called
+    po::notify(vm);
+
+    if (!vm.count("mesh")) {
+      std::cout << "You must specify a mesh file to read from." << std::endl;
+      std::exit(EXIT_SUCCESS);
+    }
+
+  } catch (const std::exception &e) {
+    std::cerr << "ERROR: " << e.what() << "\n";
+    std::cerr << desc << std::endl;
+    std::exit(EXIT_FAILURE);
+  }
+  return vm;
+}
+
+void readRecoveryFile(const std::string &recoveryFile, int &size, std::vector<int> &cellTypes, std::vector<std::vector<int>> &cells)
+{
+  // Parse the file
+  std::ifstream ifs(recoveryFile);
+  json          recoveryData = json::parse(ifs);
+  //  Get content
+  try {
+    size = recoveryData["size"].get<int>();
+  } catch (nlohmann::detail::parse_error &) {
+    std::cerr << "Error while parsing the recovery file: \"size\" attribute is missing";
+    std::exit(EXIT_FAILURE);
+  } catch (nlohmann::detail::type_error &) {
+    std::cerr << "Error while parsing recovery file \"size\" is missing";
+    std::exit(EXIT_FAILURE);
+  }
+
+  try {
+    cellTypes = recoveryData["cell_types"].get<std::vector<int>>();
+  } catch (nlohmann::detail::parse_error &) {
+    std::cerr << "Error while parsing the recovery file: \"cell_types\" attribute is missing";
+    std::exit(EXIT_FAILURE);
+  } catch (nlohmann::detail::type_error &) {
+    std::cerr << "Error while parsing recovery file \"cell_types\" is missing";
+    std::exit(EXIT_FAILURE);
+  }
+
+  try {
+    cells = recoveryData["cells"].get<std::vector<std::vector<int>>>();
+  } catch (nlohmann::detail::parse_error &) {
+    std::cerr << "Error while parsing recovery file \"cells\" is missing";
+    std::exit(EXIT_FAILURE);
+  } catch (nlohmann::detail::type_error &) {
+    std::cerr << "Error while parsing recovery file \"cells\" is missing";
+    std::exit(EXIT_FAILURE);
+  }
+}
+
+auto countPartitions(const std::string &prefix) -> size_t
+{
+  namespace fs = boost::filesystem;
+
+  std::string filename;
+  size_t      count = 0;
+
+  while (true) {
+    filename = prefix + "_" + std::to_string(count) + ".vtu";
+    if (!fs::exists(filename)) {
+      break;
+    }
+    ++count;
+  }
+  return count;
+}
+
+void writeMesh(const std::string &filename, const std::string &directory, vtkSmartPointer<vtkUnstructuredGrid> mesh)
+{
+  namespace fs = boost::filesystem;
+  if (fs::exists(directory)) {
+    if (!fs::is_directory(directory)) {
+      std::cerr << "Error: " << directory << " is not a directory." << std::endl;
+      std::exit(EXIT_FAILURE);
+    }
+  } else {
+    if (!fs::create_directory(directory)) {
+      std::cerr << "Error: Could not create directory " << directory << std::endl;
+      std::exit(EXIT_FAILURE);
+    }
+  }
+
+  auto output_path     = fs::current_path() / fs::path(directory) / fs::path(filename);
+  auto output_filename = output_path.c_str();
+
+  if (fs::extension(output_filename) == ".vtu") {
+    vtkSmartPointer<vtkXMLUnstructuredGridWriter> writer = vtkSmartPointer<vtkXMLUnstructuredGridWriter>::New();
+    writer->SetFileName(output_filename);
+    writer->SetInputData(mesh);
+    writer->Write();
+  } else if (fs::extension(filename) == ".vtk") {
+    vtkSmartPointer<vtkUnstructuredGridWriter> writer = vtkSmartPointer<vtkUnstructuredGridWriter>::New();
+    writer->SetFileName(output_filename);
+    writer->SetInputData(mesh);
+    writer->SetFileTypeToBinary();
+    writer->Write();
+  } else {
+    std::cerr << "Error: " << filename << " is not a valid output file." << std::endl;
+    std::exit(EXIT_FAILURE);
+  }
+}
+
+auto partitionwiseMerge(const std::string &prefix, size_t numparts) -> vtkSmartPointer<vtkUnstructuredGrid>
+{
+  auto joinedMesh   = vtkSmartPointer<vtkUnstructuredGrid>::New();
+  auto joinedPoints = vtkSmartPointer<vtkPoints>::New();
+  joinedPoints->SetDataTypeToDouble();
+  auto             joinedCells = vtkSmartPointer<vtkCellArray>::New();
+  std::vector<int> joinedCellTypes;
+
+  std::vector<vtkSmartPointer<vtkDoubleArray>> joinedDataVec;
+  std::vector<std::string>                     joinedDatanames;
+
+  auto reader = vtkSmartPointer<vtkXMLUnstructuredGridReader>::New();
+  for (size_t i = 0; i < numparts; ++i) {
+    // Read mesh
+    auto partname = prefix + "_" + std::to_string(i) + ".vtu";
+    reader->SetFileName(partname.c_str());
+    reader->Update();
+    // Extract mesh
+    auto grid = reader->GetOutput();
+    // Cells
+    const auto offset   = joinedPoints->GetNumberOfPoints();
+    auto       numCells = grid->GetCells()->GetNumberOfCells();
+    joinedCellTypes.reserve(joinedCellTypes.size() + numCells);
+    auto cellIds = vtkSmartPointer<vtkIdList>::New();
+    for (int j = 0; j < numCells; ++j) {
+      cellIds->Reset();
+      std::for_each(grid->GetCell(j)->GetPointIds()->begin(), grid->GetCell(j)->GetPointIds()->end(), [&cellIds, &offset](auto &pointId) { cellIds->InsertNextId(pointId + offset); });
+      joinedCells->InsertNextCell(cellIds);
+      joinedCellTypes.push_back(grid->GetCellType(j));
+    }
+    // Points
+    auto points = grid->GetPoints();
+    joinedPoints->InsertPoints(joinedPoints->GetNumberOfPoints(), grid->GetNumberOfPoints(), 0, points);
+    //  Point Data
+    auto partPointData = grid->GetPointData();
+    auto numArrays     = partPointData->GetNumberOfArrays();
+    for (int j = 0; j < numArrays; ++j) {
+      auto partData = partPointData->GetArray(j);
+      auto name     = partData->GetName();
+      if (std::find(joinedDatanames.begin(), joinedDatanames.end(), name) == joinedDatanames.end()) {
+        joinedDatanames.emplace_back(name);
+        auto newJoinedData = vtkSmartPointer<vtkDoubleArray>::New();
+        newJoinedData->SetName(name);
+        newJoinedData->SetNumberOfComponents(partData->GetNumberOfComponents());
+        joinedDataVec.push_back(newJoinedData);
+      }
+      auto joinedData = joinedDataVec[j];
+      joinedData->InsertTuples(joinedData->GetNumberOfTuples(), partData->GetNumberOfTuples(), 0, partData);
+    }
+  }
+
+  joinedMesh->SetPoints(joinedPoints);
+  for (const auto &data : joinedDataVec) {
+    joinedMesh->GetPointData()->AddArray(data);
+  }
+  joinedMesh->SetCells(joinedCellTypes.data(), joinedCells);
+
+  return joinedMesh;
+}
+
+auto recoveryMerge(const std::string &prefix, std::size_t numparts, int size, const std::vector<int> &cellTypes, const std::vector<std::vector<int>> &cells) -> vtkSmartPointer<vtkUnstructuredGrid>
+{
+  auto joinedMesh   = vtkSmartPointer<vtkUnstructuredGrid>::New();
+  auto joinedPoints = vtkSmartPointer<vtkPoints>::New();
+  joinedPoints->SetDataTypeToDouble();
+  auto             joinedCells = vtkSmartPointer<vtkCellArray>::New();
+  std::vector<int> joinedCellTypes;
+
+  joinedPoints->SetNumberOfPoints(size);
+
+  std::vector<vtkSmartPointer<vtkDoubleArray>> joinedDataVec;
+  std::vector<std::string>                     joinedDataNames;
+
+  auto reader    = vtkSmartPointer<vtkXMLUnstructuredGridReader>::New();
+  auto globalIds = vtkSmartPointer<vtkIdList>::New();
+  auto localIds  = vtkSmartPointer<vtkIdList>::New();
+
+  for (size_t i = 0; i < numparts; ++i) {
+    globalIds->Reset();
+    // Read mesh
+    auto partname = prefix + "_" + std::to_string(i) + ".vtu";
+    reader->SetFileName(partname.c_str());
+    reader->Update();
+    // Extract mesh
+    auto grid = reader->GetOutput();
+    // Points
+    auto points = grid->GetPoints();
+    // Set local Ids
+    localIds->SetNumberOfIds(points->GetNumberOfPoints());
+    std::iota(localIds->begin(), localIds->end(), 0);
+    //  Extract Global Ids
+    auto partPointData  = grid->GetPointData();
+    auto globalIdsArray = partPointData->GetArray("GlobalIDs");
+    if (globalIdsArray == nullptr) {
+      std::cerr << "GlobalIDs not found in " << partname << std::endl;
+      std::cout << " Fall back to partitionwise merge" << std::endl;
+      return partitionwiseMerge(prefix, numparts);
+    } else {
+      globalIds->Allocate(globalIdsArray->GetNumberOfTuples());
+      for (vtkIdType j = 0; j < globalIdsArray->GetNumberOfTuples(); ++j) {
+        globalIds->InsertNextId(static_cast<vtkIdType>(globalIdsArray->GetTuple1(j)));
+      }
+      joinedPoints->InsertPoints(globalIds, localIds, points);
+    }
+
+    // Cells
+    auto numCells = grid->GetCells()->GetNumberOfCells();
+    joinedCellTypes.reserve(joinedCellTypes.size() + numCells);
+    auto cellIds = vtkSmartPointer<vtkIdList>::New();
+    for (vtkIdType j = 0; j < numCells; ++j) {
+      cellIds->Reset();
+      std::for_each(grid->GetCell(j)->GetPointIds()->begin(), grid->GetCell(j)->GetPointIds()->end(), [&cellIds, &globalIds](auto &localPointId) { cellIds->InsertNextId(globalIds->GetId(localPointId)); });
+      joinedCells->InsertNextCell(cellIds);
+      joinedCellTypes.push_back(grid->GetCellType(j));
+    }
+
+    // Point Data
+    auto numArrays = partPointData->GetNumberOfArrays();
+    for (int j = 0; j < numArrays; ++j) {
+      auto partData = partPointData->GetArray(j);
+      auto name     = partData->GetName();
+      if (std::find(joinedDataNames.begin(), joinedDataNames.end(), name) == joinedDataNames.end()) {
+        joinedDataNames.emplace_back(name);
+        auto newJoinedData = vtkSmartPointer<vtkDoubleArray>::New();
+        newJoinedData->SetName(name);
+        newJoinedData->SetNumberOfComponents(partData->GetNumberOfComponents());
+        newJoinedData->Allocate(size);
+        joinedDataVec.push_back(newJoinedData);
+      }
+      auto joinedData = joinedDataVec[j];
+      joinedData->InsertTuples(globalIds, localIds, partData);
+    }
+  }
+
+  // Add Recovery cells
+  auto numCells = cells.size();
+  joinedCellTypes.reserve(joinedCellTypes.size() + numCells);
+  auto cellIds = vtkSmartPointer<vtkIdList>::New();
+  for (std::size_t i = 0; i < numCells; ++i) {
+    cellIds->Reset();
+    std::for_each(cells[i].begin(), cells[i].end(), [&cellIds](auto &pointId) { cellIds->InsertNextId(pointId); });
+    joinedCells->InsertNextCell(cellIds);
+    joinedCellTypes.push_back(cellTypes[i]);
+  }
+
+  // Assemble final mesh
+  for (const auto &data : joinedDataVec) {
+    joinedMesh->GetPointData()->AddArray(data);
+  }
+  joinedMesh->SetPoints(joinedPoints);
+  joinedMesh->SetCells(joinedCellTypes.data(), joinedCells);
+
+  return joinedMesh;
+}
+
+void join(int argc, char *argv[])
+{
+  namespace fs        = boost::filesystem;
+  auto        options = getOptions(argc, argv);
+  std::string prefix  = options["mesh"].as<std::string>();
+  std::string output{};
+  std::string recovery{};
+  if (options.find("output") == options.end()) {
+    output = prefix + "_joined.vtk";
+  } else {
+    output = options["output"].as<std::string>();
+  }
+  if (options.find("recovery") != options.end()) {
+    recovery = options["recovery"].as<std::string>();
+  } else {
+    recovery = prefix + "_recovery.json";
+  }
+  std::string directory = options["directory"].as<std::string>();
+  size_t      numparts  = options["numparts"].as<size_t>();
+
+  if (numparts == 0) {
+    numparts = countPartitions(prefix);
+  }
+
+  vtkSmartPointer<vtkUnstructuredGrid> joinedMesh = nullptr;
+  if (fs::exists(recovery)) {
+    std::cout << "Recovery file found. Recovering the connectivity information of the mesh." << std::endl;
+    int                           size;
+    std::vector<int>              cellTypes;
+    std::vector<std::vector<int>> cells;
+    readRecoveryFile(recovery, size, cellTypes, cells);
+    joinedMesh = recoveryMerge(prefix, numparts, size, cellTypes, cells);
+  } else {
+    std::cout << "Recovery file not found. Partition-wise merging will be done." << std::endl;
+    joinedMesh = partitionwiseMerge(prefix, numparts);
+  }
+
+  writeMesh(output, options["directory"].as<std::string>(), joinedMesh);
+}
+
+auto main(int argc, char *argv[]) -> int
+{
+  join(argc, argv);
+  return EXIT_SUCCESS;
+}
diff --git a/src/precice-aste-join.hpp b/src/precice-aste-join.hpp
new file mode 100644
index 00000000..0a21b0eb
--- /dev/null
+++ b/src/precice-aste-join.hpp
@@ -0,0 +1,80 @@
+#pragma once
+
+#include <boost/filesystem.hpp>
+#include <boost/program_options.hpp>
+#include <iostream>
+#include <numeric>
+#include <string>
+#include <vector>
+#include <vtkDoubleArray.h>
+#include <vtkPointData.h>
+#include <vtkPoints.h>
+#include <vtkSmartPointer.h>
+#include <vtkUnstructuredGrid.h>
+#include <vtkUnstructuredGridWriter.h>
+#include <vtkXMLUnstructuredGridReader.h>
+#include <vtkXMLUnstructuredGridWriter.h>
+#include "json.hpp"
+
+using OptionMap = boost::program_options::variables_map;
+using json      = nlohmann::json;
+
+/**
+ * @brief Get the Options object from command line arguments
+ *
+ * @param argc
+ * @param argv
+ * @return OptionMap
+ */
+auto getOptions(int argc, char *argv[]) -> OptionMap;
+
+void readRecoveryFile(const std::string &recoveryFile, int &size, std::vector<int> &cellTypes, std::vector<std::vector<int>> &cells);
+
+/**
+ * @brief Count the number of partitioned mesh files for given prefix
+ *
+ * @param prefix
+ * @return size_t
+ */
+auto countPartitions(const std::string &prefix) -> size_t;
+
+/**
+ * @brief Write the joined mesh to a VTK file
+ *
+ * @param filename
+ * @param directory
+ * @param mesh
+ */
+void writeMesh(const std::string &filename, const std::string &directory, vtkSmartPointer<vtkUnstructuredGrid> mesh);
+
+/**
+ * @brief Merge the meshes from the partitioned files
+ * @details The meshes are merged in the order of the partitioned files
+ * @details The cells betwen the meshes are not connected
+ * @details The point numbering is not preserved between unpartitioned mesh and the merged mesh
+ *
+ * @param prefix
+ * @param numparts
+ * @return vtkSmartPointer<vtkUnstructuredGrid>
+ */
+auto partitionwiseMerge(const std::string &prefix, size_t numparts) -> vtkSmartPointer<vtkUnstructuredGrid>;
+
+/**
+ * @brief Merge the meshes from the partitioned files
+ * @details The meshes are merged to recover the original mesh
+ * @details All the cells are preserved and connected
+ * @details The point numbering is preserved between unpartitioned mesh and the merged mesh
+ *
+ * @param prefix
+ * @param numparts
+ * @param size
+ * @param cellTypes
+ * @param cells
+ * @return vtkSmartPointer<vtkUnstructuredGrid>
+ */
+auto recoveryMerge(const std::string &prefix, std::size_t numparts, int size, const std::vector<int> &cellTypes, const std::vector<std::vector<int>> &cells) -> vtkSmartPointer<vtkUnstructuredGrid>;
+
+/**
+ * @brief Read the commandline arguments and merge the meshes to a single mesh
+ */
+void join(int argc, char *argv[]);