You can find some used/refurbished Lenovo X240 or Lenovo X250 for less than $600 on Ebay. Sure, your i7 processor will be a couple generations behind but it will be enough for pretty much any development you can throw at it. Then with any remaining money you have left, upgrade it to the highest available RAM and then whatever SSD that you are able to afford.
I myself had to do something similar once and bought a used Lenovo X230 for like $250, upgraded it to 16GB RAM and 1TB SSD, put in Ubuntu GNOME and I was constantly amazed at how fast and stable it was for a computer made in 2011, though I have already transitioned to using a Macbook Pro.
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You can find some used/refurbished Lenovo X240 or Lenovo X250 for less than $600 on Ebay. Sure, your i7 processor will be a couple generations behind but it will be enough for pretty much any development you can throw at it. Then with any remaining money you have left, upgrade it to the highest available RAM and then whatever SSD that you are able to afford.
I myself had to do something similar once and bought a used Lenovo X230 for like $250, upgraded it to 16GB RAM and 1TB SSD, put in Ubuntu GNOME and I was constantly amazed at how fast and stable it was for a computer made in 2011, though I have already transitioned to using a Macbook Pro.