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I have a bit of software that is hard coded to open eth0. My system assigned the name enp0s25 to my ethernet connection. I could go through the code and replace all instances of eth0; I'm just hoping there is a shortcut I can take.

Is it safe to create symbolic links inside /sys/class/net? I see lo and enp0s25 in there. I'm tempted to just create a link named eth0 there, but I have no idea what that would do to my system.

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According to udev manpage the udev-systemd daemon provides interfaces names using internal rules. This can be overriden by adding a rule file in the /etc/udev/rules.d directory. One of this file should be used to set persistent ethernet interfaces names, containing commented rules like that one :

#SUBSYSTEM=="net", DRIVERS=="?*", ATTR{address}=="00:1c:c4:e1:2e:d6", KERNEL=="eth*", NAME="ethx"

You can create your own rule that match your interface MAC address and NAME=eth0.

I recommend you read this : Understanding systemd’s predictable network device names

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