  We report the discovery of a super-Jovian 2:1 mean-motion resonance (MMR)
pair around the G-type star TIC 279401253, whose dynamical architecture is a
prospective benchmark for planet formation and orbital evolution analysis. The
system was discovered thanks to a single transit event recorded by the
Transiting Exoplanet Survey Satellite (TESS) mission, which pointed to a
Jupiter-sized companion with poorly constrained orbital parameters. We began
ground-based precise radial velocity (RV) monitoring with HARPS and FEROS
within the Warm gIaNts with tEss (WINE) survey to constrain the transiting
body's period, mass, and eccentricity. The RV measurements revealed not one but
two massive planets with periods of 76.80$_{-0.06}^{+0.06}$ days and
155.3$_{-0.7}^{+0.7}$ days, respectively. A combined analysis of transit and RV
data yields an inner transiting planet with a mass of 6.14$_{-0.42}^{+0.39}$
M$_{\rm Jup}$ and a radius of 1.00$_{-0.04}^{+0.04}$ R$_{\rm Jup}$, and an
outer planet with a minimum mass of 8.02$_{-0.18}^{+0.18}$ M$_{\rm Jup}$,
indicating a massive giant pair. A detailed dynamical analysis of the system
reveals that the planets are locked in a strong first-order, eccentricity-type
2:1 MMR, which makes TIC 279401253 one of the rare examples of truly resonant
architectures supporting disk-induced planet migration. The bright host star,
$V \approx$ 11.9 mag, the relatively short orbital period ($P_{\rm b}$ =
76.80$_{-0.06}^{+0.06}$ d) and pronounced eccentricity (e
=0.448$_{-0.029}^{+0.028}$) make the transiting planet a valuable target for
atmospheric investigation with the James Webb Space Telescope (JWST) and
ground-based extremely-large telescopes.
