Best Split Keyboards for Coders?

Depending on your budget, take a look at the MoonLander/Ergodox [1] or Kinesis [2].

You can also take the DIY path, with stuff like Dactyl, Sofle etc.

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[1] https://www.zsa.io/moonlander/

[2] https://kinesis-ergo.com/keyboards/advantage360/