The project thermoEint aims to help the integration and success of international students in the field of Thermodynamics through the creation of a comprehensive relation of English e-assessments. In this work, the utilized methodology and workflows for the implementation of the online content in STEM fields are introduced. They are based on the determination of didactic and technical requirements for the online content after analyzing the gathered data obtained from educational staff experience, previous e-learning projects and students' feedback. With the help of the software and learning management service of ONYX and OPAL, a set of proposed solutions are introduced. In the same context, to ensure the quality of the online teaching material, a continuous improvement workflow is proposed on a year-to-year basis.