The application experts work both at NSC/PDC and with the researchers in the e-Science communities. They are HPC experts within their respective field of application (for example bioinformatics, computational chemistry or climate modelling). The goal is to enable better use of the e-Science resources, e.g. advanced code optimization, parallelization, choice of architectures, etc within the application areas. This kind of support will be even more important in the future with the wide-spread use of many-core architectures as well as accelerator technologies like GPUs and FPGAs where normal code is orders of magnitude slower than optimized.
More information about the application experts, their areas of expertise and the applications can be found here, and the projects are involved in are listed here.