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We present a simu!ation of morphogenesis and cell interaction which allows us to address embryogenesis as an engineering problem. A space of cell control functions is defined using a cybernetics approach by identifying the controlling variables and the degrees of freedom of each individual cell. These functions receive inputs which are dependent on a cell's context, and determine its responses to that context. Multiple cells are coupled through a simulation of a 3d reaction-diffusion fluid matrix in order io generate interactive behaviour. A fitness function is designed which characterises the desired behaviour of the cellular collective. We tune ihe parameterised control funciion for the individual cells using a genetic algorithm to maximise the fitness of their collective behaviour