Alduro is a four-legged walking robot. Its main goal is to operate in rugged terrain, translating the cartesian operator commands (joystick) into actuator space by coor- dinating the legs according to the users wish. At the same time static stability has to be guaranteed, obstacles have to be avoided and the posture of the main body kept. This re- quires an elaborate motion coordination and controller soft- ware. One possible way to organise this is described here: by isolating the physical robot from the motion generation (hardware abstraction layer), by using concurrent behav- iours for motion generation and by strict modularisation of the software. The selected tools and realtime operating system are described in the last sections.