diff --git a/mix/CodeModel.cpp b/mix/CodeModel.cpp
new file mode 100644
index 000000000..120a81ac7
--- /dev/null
+++ b/mix/CodeModel.cpp
@@ -0,0 +1,81 @@
+/*
+    This file is part of cpp-ethereum.
+
+    cpp-ethereum is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    cpp-ethereum is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/** @file CodeModel.cpp
+ * @author Arkadiy Paronyan arkadiy@ethdev.com
+ * @date 2014
+ * Ethereum IDE client.
+ */
+
+#include "CodeModel.h"
+
+namespace dev
+{
+namespace mix
+{
+
+void BackgroundWorker::queueCodeChange(int _jobId, QString const& _content)
+{
+	m_model->runCompilationJob(_jobId, _content);
+}
+
+
+CodeModel::CodeModel(QObject* _parent) : QObject(_parent), m_backgroundWorker(this)
+{
+	m_backgroundWorker.moveToThread(&m_backgroundThread);
+
+	connect(this, &CodeModel::compilationComplete, this, &CodeModel::onCompilationComplete, Qt::QueuedConnection);
+	connect(this, &CodeModel::scheduleCompilationJob, &m_backgroundWorker, &BackgroundWorker::queueCodeChange, Qt::QueuedConnection);
+	m_backgroundThread.start();
+}
+
+CodeModel::~CodeModel()
+{
+	stop();
+	disconnect(this);
+}
+
+void CodeModel::stop()
+{
+	///@todo: cancel bg job
+	m_backgroundThread.exit();
+	m_backgroundThread.wait();
+}
+
+void CodeModel::registerCodeChange(const QString &_code)
+{
+	// launch the background thread
+	m_backgroundJobId++;
+	emit scheduleCompilationJob(m_backgroundJobId, _code);
+}
+
+void CodeModel::onCompilationComplete(std::shared_ptr<CompilationResult> _compilationResult)
+{
+	m_result.swap(_compilationResult);
+}
+
+
+void CodeModel::runCompilationJob(int _jobId, QString const& _content)
+{
+	if (_jobId != m_backgroundJobId)
+		return; //obsolete job
+
+
+}
+
+
+}
+}
diff --git a/mix/CodeModel.h b/mix/CodeModel.h
new file mode 100644
index 000000000..1667f19a4
--- /dev/null
+++ b/mix/CodeModel.h
@@ -0,0 +1,109 @@
+/*
+    This file is part of cpp-ethereum.
+
+    cpp-ethereum is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    cpp-ethereum is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/** @file CodeModel.h
+ * @author Arkadiy Paronyan arkadiy@ethdev.com
+ * @date 2014
+ * Ethereum IDE client.
+ */
+
+#pragma once
+
+#include <QObject>
+#include <QThread>
+#include <libdevcore/Common.h>
+
+namespace dev
+{
+namespace mix
+{
+
+class CodeModel;
+class QContractDefinition;
+
+class BackgroundWorker: public QObject
+{
+	Q_OBJECT
+
+public:
+	BackgroundWorker(CodeModel* _model): QObject(), m_model(_model) {}
+
+public slots:
+	void queueCodeChange(int _jobId, QString const& _content);
+private:
+	CodeModel* m_model;
+};
+
+
+class CompilationResult : public QObject
+{
+	Q_OBJECT
+	Q_PROPERTY(QContractDefinition const* contract READ contract)
+
+public:
+	QContractDefinition const* contract() { return m_contract; }
+
+private:
+	bool m_successfull;
+	QContractDefinition* m_contract;
+	QString m_hexCode;
+	QString m_compilerMessage; ///< @todo: use some structure here
+	dev::bytes m_bytes;
+	///@todo syntax highlighting, etc
+};
+
+class CodeModel : public QObject
+{
+	enum Status
+	{
+		Idle,
+		Compiling,
+	};
+
+	Q_OBJECT
+
+public:
+	CodeModel(QObject* _parent);
+	~CodeModel();
+
+	CompilationResult* getLastCompilationResult();
+
+signals:
+	void statusChanged(Status _from, Status _to);
+	void compilationComplete(std::shared_ptr<CompilationResult> _compilationResult);
+	void scheduleCompilationJob(int _jobId, QString const& _content);
+
+public slots:
+	void registerCodeChange(QString const& _code);
+
+private slots:
+	void onCompilationComplete(std::shared_ptr<CompilationResult> _compilationResult);
+
+private:
+	void runCompilationJob(int _jobId, QString const& _content);
+	void stop();
+
+	std::shared_ptr<CompilationResult> m_result;
+	QThread m_backgroundThread;
+	BackgroundWorker m_backgroundWorker;
+	int m_backgroundJobId = 0; //protects from starting obsolete compilation job
+
+	friend class BackgroundWorker;
+};
+
+}
+
+}