In the last decades due to the growing number of spectroscopic surveys, the number of spectra has increased to several hundreds of thousands to study the Galactic stellar populations. Current Galactic surveys, including the promising Gaia mission, rely on the efficiency of the spectral analysis techniques to provide precise and accurate spectral information (i.e.

effective temperature, surface gravity, metallicity, and chemical abundances) in the shortest computational time.

In this work, we present a new package to preform complete spectral analyses based on the spectral synthesis technique (Tsantaki et al. 2017, submitted).

We focus on deriving atmospheric parameters for FGK-type stars using both high and medium resolution (GIRAFFE) spectra. This method is implemented on the Gaia-ESO benchmark stars to confirm its validity, achieving similar accuracy for the two resolution setups. We show that this methodology can be extended to the soon expected Gaia RVS spectra.