This report "OXMES - Open Extensible Manufacturing Execution System", is the written result of the master thesis project for the Embedded Software Systems programme. The overall project comprises of two parts. In the first one, a specific problem related to Industry 4.0 has been investigated, and a system design has been proposed. The report for the first part can be found under the name of "Extensible Manufacturing Execution System - Designing a modular, extensible MES for dependability and research". The second part of the project is the subject of this current report.

In this report we investigate the implementation of a Manufacturing Execution System (MES), to be used together with a Modular Manufacturing System. While the text contains concepts from the manufacturing and production fields, the work is mainly described from a computer science point of view. The report is made up of eight chapters, in which the premises of the project are being set, a problem statement is formulated, the system is further designed, and its implementation is described. Lastly, the work is evaluated and concluded.

The MES is implemented using a micro services architecture. The ASP.NET Core framework has been used to facilitate this. The implementation of three of the core services of the MES will be described in detail. Throughout the report there will be references and comparisons with the current MES used at the Department of Materials and Production. In the final chapters, the work is evaluated in terms of usability and possibility of further development. Known issues of the system, suggestions for features and possible improvements will be covered in the conclusion.