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Urbit is a clean-slate reimplementation of the whole system software stack. On the bottom it's a replacement of the lambda calculus, in the middle it's a new functional programming language, on top it's a purely functional network operating system inwhich address space is property.
Add it to your list — we'll start writing once their board is connected.
Board not connected
We haven't found Tlon's job board yet, so we can't see what they have open — an empty list here doesn't mean they aren't hiring.
We re-check for it regularly. If you add Tlon to your list now, your alerts start the day we connect it. Meanwhile, their own site is the place to look.