The Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing (IAASARS) of the National Observatory of Athens announces several openings in the framework of the ESA program “Hubble Catalog of Variables” and invites applications for the following positions: (i) two postdoctoral research positions on identifying and characterizing variable stars in the Hubble Source Catalog; (ii) one postdoctoral research position with expertise in programming or a software engineer; (iii) several PhD positions, on projects related to identifying and characterizing variable stars in the Hubble Source Catalog (HSC). Applicants with previous experience in stellar variability (detection algorithms, light curve analysis, characterization of variables), photometry, HST data or a related field are particularly encouraged to apply. For more information click here.