Bcknd s srvc (BS), smtms ls rfrrd t s mbl bcknd s srvc (MBS), s srvc fr prvdng wb pp nd mbl pp dvlprs wth wy t sly bld bcknd t thr frntnd pplctns. Ftrs vlbl ncld sr mngmnt, psh ntfctns, nd ntgrtn wth scl ntwrkng srvcs. Ths srvcs r prvdd v th s f cstm sftwr dvlpmnt kts (SDKs) nd pplctn prgrmmng ntrfcs (Ps). BS s rltvly rcnt dvlpmnt n cld cmptng, wth mst BS strtps dtng frm 2011 r ltr. Sm f th mst pplr srvc prvdrs r WS mplfy nd Frbs.