It depends on what you want out of Redditgifts. If it is a "project" then you can continue to hack around with new technologies but if you want to make a busine

It depends on what you want out of Redditgifts. If it is a "project" then you can continue to hack around with new technologies but if you want to make a business out of it then probably you should use the tools which you have already mastered (in your case python). Creating a business itself is so demanding that shifting your focus on "newer" technologies (e.g. node.js) will make it twice as difficult. One approach which you can take is to use the technology which you know well to create critical business components and for housekeeping (metrics, analysis etc.) use the bleeding edge of technology.