Creator of Electronic Studio of National Musical Academy of Ukraine, lecturer at the computer music technology department at the National Musical Academy. Made music for audio-visual installations, films. Since 2003 Alla is Artistic Director of International project Electroacoustic (Kyiv).
Zagaykevych's compositions were performed by: The National Symphony Orchestra of Ukraine, Philarmonic Orchestras of Chernigiv, Rivne, ensembles CAT, Archi, Frescos, New Performance, Cluster, Ricoshet, Kyiv Camerata (Ukraine), ensemle Court-Circuit (France), Ensemble Contemporain de Montreal, Kammersymphoniker (Austria), ensemble Recherche (Germany), J.Isaac, (recorders, live electronics), (Hollande).