[nreece]

Wait until you have customers who will pay for the app, so that you have ongoing revenue to sustain your project as a business. Spend some on marketing. Once you reach up-to a 5-digit figure in monthly revenue (MRR), then try to hire one (or few) dev/devop people so that you can focus on other important areas like business development, sales, product development, customer support etc.

Investment makes sense (and you'll get a much better deal from investors) when you have recurring revenue AND you have to grow fast to the next stage (e.g. from a small team of 2 to a team of 5-10, from a few servers to many, from a local office to globally, from self-serve online sales to face-to-face B2B/Enterprise sales for which you need sales people etc.)

In short, evolve organically and delay outside investment until absolutely necessary for rapid growth.