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+# Overall Architecture
+![Overall Architecture](https://github.com/ReCodEx/GlobalWiki/blob/master/images/Overall_Architecture.png)
+
+**ReCodEx** is designed to be very modular. **WebApp** + **File Server** are one instance of the application. They contain almost all logic of the app including _user management and authentication_, _storing and versioning tasks_, _counting and assigning points_ to users etc. One instance of the app can be connected to one or more **Workers** and one **Worker** can be connected to more instances of the **WebApp**. **Worker** is connected with **WebApp** through messaging queue.
+
+## Worker
+![Worker Architecture](https://github.com/ReCodEx/GlobalWiki/blob/master/images/Worker_Architecture.png)
+
+**Worker's** main role is securely _compile_, _run_ and _evaluate_ given submit against model solutions provided by author of each task. It is logicaly divided into three objects:
+- **Message Frontend** communicates with **WebApp** using messaging queue [ZeroMQ](http://zeromq.org/). It receives new submits, operates the evaluation through **Work API** and reports progress back.
+- **Worker Core** can do all evaluating steps and is responsible for security of them. Great sandbox [Isolate](https://github.com/ioi/isolate) is used.
+- **File Server Frontend** ensures via **File API** access to files on **File Server**, where are stored testing inputs and corresponding outputs for each task and other required files. It's possible to upload files, too.
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