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We present the discovery of a highly irradiated and moderately inflatedultra-hot Jupiter, TOI-1431b/MASCARA-5b (HD 201033b), first detected by NASA'sTransiting Exoplanet Survey Satellite mission (TESS) and the Multi-site All-SkyCAmeRA (MASCARA). The signal was established to be of planetary origin throughradial velocity measurements obtained using SONG, SOPHIE, FIES, NRES, andEXPRES, which show a reflex motion of $K=294.1\pm1.1$ m s$^{-1}$. A jointanalysis of the TESS and ground-based photometry and radial velocitymeasurements reveals that TOI-1431b has a mass of $M_{p}=3.12\pm0.18$$\rm{M_J}$ ($990\pm60$ M$_{\oplus}$), an inflated radius of $R_{p}=1.49\pm0.05$$\rm{R_J}$ ($16.7\pm0.6$ R$_{\oplus}$), and an orbital period of$P=2.650237\pm0.3$ d. Analysis of the spectral energy distribution of thehost star reveals that the planet orbits a bright ($\mathrm{V}=8.049$ mag) andyoung ($0.29^{+0.32}_{-0.19}$ Gyr) Am type star with $T_{\rmeff}=7690^{+400}_{-250}$ $\rm{K}$, resulting in a highly irradiated planet withan incident flux of $\langle F \rangle=7.24^{+0.68}_{-0.64}\times$10$^9$ ergs$^{-1}$ cm$^{-2}$ ($5300^{+500}_{-470}\mathrm{S_{\oplus}}$) and an equilibriumtemperature of $T_{eq}=2370\pm70$ K. TESS photometry also reveals a secondaryeclipse with a depth of $127^{+4}_{-5}$ppm as well as the full phase curve ofthe planet's thermal emission in the red-optical. This has allowed us tomeasure the dayside and nightside temperature of its atmosphere as$T_\mathrm{day}=3004\pm64$ K and $T_\mathrm{night}=2583\pm63$ K, the secondhottest measured nightside temperature. The planet's low day/night temperaturecontrast ($\sim$420 K) suggests very efficient heat transport between thedayside and nightside hemispheres.

TOI-1431b/MASCARA-5b: A Highly Irradiated Ultra-Hot Jupiter Orbiting One of the Hottest & Brightest Known Exoplanet Host Stars