[dimva]

Another shameless plug: I made a service like this for myself and a few friends: https://zenve.st

It actually trades on your behalf, but only to keep your portfolio balanced and to allocate any cash you deposit into the account. It works on top of Vanguard, and you can customize it to invest in any Vanguard ETFs with whatever allocation you want.

Currently, you can only sign up for the waitlist, as I don't know if people would be interested in something like this.