  We present the new version 2.0 of the Feynman integral reduction program Kira
and describe the new features. The primary new feature is the reconstruction of
the final coefficients in integration-by-parts reductions by means of finite
field methods with the help of FireFly. This procedure can be parallelized on
computer clusters with MPI. Furthermore, the support for user-provided systems
of equations has been significantly improved. This mode provides the
flexibility to integrate Kira into projects that employ specialized reduction
formulas, direct reduction of amplitudes, or to problems involving linear
system of equations not limited to relations among standard Feynman integrals.
We show examples from state-of-the-art Feynman integral reduction problems and
provide benchmarks of the new features, demonstrating significantly reduced
main memory usage and improved performance w.r.t. previous versions of Kira.

High Energy Physics - Phenomenology;High Energy Physics - Theory