OPS-SAT is a mission that runs a system on module with ARM-9 processors and an FPGA (Cyclone 5) coding environment. The ARM has a Linux Ångström distribution with Python3, Java, C++, and C available. On top of that ESA is providing a framework that experimenters can use to deploy on-board experiments in a App-like way. All this is available for experimenters to use for free until Nov 2021 and it is flying now. The question is how does it work practically? In this workshop the OPS-SAT flight control team will walk you through some user stories pretending to be experimenters from the idea stage to actually deploying the code on the flatsat and executing it. This will be done live.