We confirm the planetary nature of two transiting hot Jupiters discovered by the Kepler spacecraft’s K2 extended mission in its Campaign 4, using precise radial velocity measurements from FIES@NOT, HARPS-N@TNG, and the coudé spectrograph on the McDonald Observatory 2.7 m telescope. K2-29 b (EPIC 211089792b) transits a K1V star with a period of 3.2589263 ± 0.0000015 days; its orbit is slightly eccentric (e={0.084}-0.023+0.032). It has a radius of {R}P={1.000}-0.067+0.071 RJ and a mass of {M}P={0.613}-0.026+0.027 MJ. Its host star exhibits significant rotational variability, and we measure a rotation period of {P}{rot}=10.777+/- 0.031 days. K2-30 b (EPIC 210957318 b) transits a G6V star with a period of 4.098503 ± 0.000011 days. It has a radius of {R}P={1.039}-0.051+0.050 RJ and a mass of {M}P={0.579}-0.027+0.028 MJ. The star has a low metallicity for a hot Jupiter host, [{Fe}/{{H}}]=-0.15+/- 0.05.