The ESA Summer of Code in Space program (SOCIS; http://sophia.estec.esa.int/socis2013/) is designed to attract undergraduate and graduate developers to write code to for various space related open source software projects. It offers a sizeable remuneration of 4000 Euros for a coding period of 3 months (mid-August to mid-November). Astropy/specutils has been selected as a mentoring organizations and is now accepting applications (for details please go to https://github.com/astropy/specutils/wiki/SoCiS-2013-ideas; deadline is 4th of August). The Astropy Project is a community effort to develop a single core package for Astronomy in Python and foster interoperability between Python astronomy packages. Our SOCIS mentorship will focus on expanding the astropy-specutils package that is designed to deal with code that focuses on spectral data analysis.
ESA has some eligibility criteria http://sophia.estec.esa.int/socis2012/?q=faq#socis_elig_restrictions.