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.