If you are getting notifications from DevelopEfficient, then your Mac is infected with adware. DevelopEfficient is adware for Mac.
DevelopEfficient changes setting in your Mac. First, DevelopEfficient installs a browser extension in your browser. Then, after DevelopEfficient hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.