Arrays of neutral atoms, trapped and imaged via high-resolution optics and interacting via Rydberg blockade, are a leading platform in quantum simulations and quantum computing. Their performance scales with the number of individually addressed atoms, currently of a few thousands, close to ultimate constraints set by optics and geometry. Optically connecting atomic arrays could lift this roadblock. For this, a currently missing piece of technology is an efficient and Rydberg-compatible system for entangling neutral atoms with optical photons. In our lab, we recently demonstrated an efficient and strong interaction between a single photon in a running-wave optical cavity and a Rydberg-blockaded atomic cloud, that acts as an effective two-level superatom. Leveraging the efficiency of this approach, we are building a new experimental setup combining high-numerical-aperture optics with a centimeter-scale running-wave medium-finesse cavity, to create a highly efficient interface between single atom arrays and single photons mediated by Rydberg superatoms. We offer an internship position dedicated on one side to the experimental construction of the laser system and on another side to numerical simulations of single atom trapping and transport. This internship could continue with a PhD position, aiming at a highly-efficient atom-photon entanglement, a building block for future interconnections between atomic processors.