The MOLLER (Measurement Of a Lepton-Lepton Electroweak Reaction) experiment aims to measure the parity-violating asymmetry APV in the scattering of longitudinally polarized electrons off unpolarized electrons, using the recently upgraded 11 GeV beam in Hall A at Jefferson Laboratory (JLab). The goal is to reach an overall accuracy of 2.4% for the measured APV, which would be an improvement of a factor of five compared to any other similar experiment to date. This thesis discusses hardware aspects of the design and development of the main detectors for MOLLER, as well as development work towards a new type of electron detector (HVMAPS) that will be used for both the integrating detector and the Compton polarimeter. Prototypes of the integrating detectors were assembled and tested using the 855 MeV beam at the Mainz Microtron (MAMI) in Mainz, Germany. A new mounting structure with an integrated cooling system is being developed for the HVMAPS detectors for the Compton polarimeter.