Ask HN: What software does every company write themselves?

[bactrian]

Before Stripe every company had to hack together their own payment gateway. Before PagerDuty every company had to hack together their own incident response system.

What problems like these exist today?

[stephenr]

> Before Stripe every company had to hack together their own payment gateway.

WTF are you talking about? Payment gateways have been a thing for decades.