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(Abridged) Palomar Gattini-IR is a new wide-field, near-infrared robotic timedomain survey operating at Palomar Observatory. Using a 30 cm telescope mountedwith a H2RG detector, Gattini-IR achieves a field of view of 25 sq. deg. with apixel scale of 8.7" in J-band. Here, we describe the system design, surveyoperations, data processing system and on-sky performance of PalomarGattini-IR. As a part of the nominal survey, Gattini-IR scans $\approx 7500$square degrees of the sky every night to a median 5$\sigma$ depth of $15.7$ ABmag outside the Galactic plane. The survey covers $\approx 15000$ squaredegrees of the sky visible from Palomar with a median cadence of 2 days. Areal-time data processing system produces stacked science images from ditheredraw images taken on sky, together with PSF-fit source catalogs and transientcandidates identified from subtractions within a median delay of $\approx 4$hours from the time of observation. The calibrated data products achieve anastrometric accuracy (RMS) of $\approx 0.7$" with respect to Gaia DR2 forsources with S/N $> 10$, and better than $\approx 0.35$" for sources brighterthan $\approx 12$ Vega mag. The photometric accuracy (RMS) achieved in thePSF-fit source catalogs is better than $\approx 3$% for sources brighter than$\approx 12$ Vega mag, as calibrated against the 2MASS catalog. With a field ofview $\approx 40\times$ larger than any other existing near infrared imaginginstrument, Gattini-IR is probing the reddest and dustiest transients in thelocal universe such as dust obscured supernovae in nearby galaxies, novaebehind large columns of extinction within the galaxy, reddened micro-lensingevents in the Galactic plane and variability from cool and dust obscured stars.We present results from transients and variables identified since the start ofthe commissioning period.

Palomar Gattini-IR: Survey overview, data processing system, on-sky performance and first results