I present the architecture of the backend of Online Data Analysis (ODA) platform, developed at Common Data Center Infrastructure of UniGE to facilitate reduction and analytics of astronomical data. The currently publicly available version allows to effortlessly explore and exploit observations of ESA’s INternational Gamma-Ray Laboratory (INTEGRAL) as well as Polar GRB polarization detector. The platform can be accessed through a user-friendly on-line interface, suitable for researchers not familiar with INTEGRAL or Polar data reduction but interested in astrophysical phenomena. More involved configuration of the analysis can be achieved through detailed formulation of the requests to one of levels of the backend service infrastructure through an HTTP API. The backend relies on a provenance-driven storage and workflow management infrastructure, which ensures transparent, non-redundant, and extensible management of the scientific data and data analysis processes.