  We report on the detection of type-C quasi-periodic oscillations during the
initial stages of the outburst of Swift J1727.8-1613 in 2023. Using data of the
INTEGRAL observatory along with the data of the SRG/ART-XC and Swift/XRT
telescopes the fast growth of the QPO frequency was traced. We present a hard
X-ray lightcurve that covers the initial stages of the 2023 outburst - the fast
rise and plateau - and demonstrate that the QPO frequency was stable during the
plateau. The switching from type-C to type-B QPO was detected with the
beginning of the source flaring activity. We have constructed a broad-band
spectrum of Swift J1727.8-1613 and found an additional hard power-law spectral
component extending at least up to 400 keV. Finally, we have obtained an upper
limit on the hard X-ray flux at the beginning of the optical outburst and
estimated the delay of the X-ray outburst with respect to the optical one.
