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we currently do interaction design / wireframes ourselves and plan to get a visual/graphic designer onboard in the next weeks.

one point learned already here: a visual designer could have given valuable input early on. so try to gather some ideas from designers early on

Have you reached the MVP stage yet? I'm wondering whether it's viable to release before having a professionally made design.

no we havent released a MVP yet and i also think a mvp needs at least a "decent" design. (depending on your customers of course)

but we will do some user tests before the design is ready, just to find major flaws in the interaction & interface.