Having worked with all of the above besides Lambda I think I can offer some points to help with your decision. It would be nice to know what kind of work was being done with Lambda but oh well.<p>Using Python will give you better readability, more battle tested libraries, a more robust set of tools for data&#x2F;number processing and (this is the kicker) a much easier time interoping with Postgres, specifically it&#x27;s stored functions and procedures.<p>Using Node will give you a better paradigm for evented I&#x2F;0 tasks, be quicker with basic I&#x2F;O tasks, more experience with javascript (don&#x27;t underestimate this), a larger pool of people who will likely understand this as this is typically the first if not the second language web developers learn, but as a downside node comes with a rapidly changing eco system so what you write could become out of date very fast and the asynchronous nature of it all can make the logic much harder to follow.<p>Both are quite popular and enjoy some amazing communities behind them, so you&#x27;ll be fine in whatever you choose.