A method of executing an A/B testing service comprises deploying an instance of the A/B testing service between a client device and an A/B testing server and receiving by the A/B testing service from the A/B testing server a software development kit (SDK) key for a client device, the SDK key indicating an A/B testing environment to be associated with the instance. The method further comprises, in response to receiving the SDK key: storing data associated with the A/B testing environment in memory of the client device; providing a HyperText Transfer Protocol (HTTP) application programming interface (API) associated with the instance of the A/B testing service to one or more applications associated with the A/B testing environment; and executing, by a processing device, commands between the client device and the one or more applications on behalf of the A/B testing environment.