It's an interesting combination with IBM shipping REST capability with CICS[1]. From what I've seen in this area (I work for a shop with zOS and zLinux) IBM are getting heavily onboard the mobile-first bandwagon. So REST-enable your existing transactional CICS code, get fast access to it via hipersockets to your node.js/zLinux server, and then deliver it to your front-ends.<p>[1] Define some bindings on your CICS side, run some JCL, now you have a REST service.