  The Solar eruptioN Integral Field Spectrograph (SNIFS) is a solar-gazing
spectrograph scheduled to fly in the summer of 2025 on a NASA sounding rocket.
Its goal is to view the solar chromosphere and transition region at a high
cadence (1s) both spatially (0.5") and spectrally (33 m{\AA}) viewing
wavelengths around Lyman Alpha (1216 {\AA}), Si iii (1206 {\AA}) and O v (1218
{\AA}) to observe spicules, nanoflares, and possibly a solar flare. This time
cadence will provide yet-unobserved detail about fast-changing features of the
Sun. The instrument is comprised of a Gregorian-style reflecting telescope
combined with a spectrograph via a specialized mirrorlet array that focuses the
light from each spatial location in the image so that it may be spectrally
dispersed without overlap from neighboring locations. This paper discusses the
driving science, detailed instrument and subsystem design, and pre-integration
testing of the SNIFS instrument.
