The search of compact objects in binary systems traditionally reply on non-thermal radiations, including radio, X-rays and gamma-rays. In recent years, planet-search satellites such as Transiting Exoplanet Survey Satellite (TESS) have opened an era of high-precision photometry of a large number of stars.  I demonstrate that TESS photometric data are very useful in identifying periodicities of known redback-like systems, by observing the orbital period-modulated flux variation from the stellar companion. We went on to identify a group of potential compact binaries within Fermi gamma-ray source locations. I will also talk about our on-going efforts of follow-up observations of such compact binary candidates using ground-based radio and optical telescopes. The discovery of new compact binaries (redback pulsars in particular) has implications on gravitational wave astronomy, astrophysics, and even nuclear physics.