Workflow engines. Every company develops one base off of queues or some form of async messaging. Works great when prototyping and your initial customer base. Works less great as you grow, add more complicated features, and realize you didn't have the distributed systems expertise to write this thing to begin with. It doesn't handle any of the common edge cases, and is increasingly painful to operate, needing constant babysitting.
Use Temporal, StepFunctions, something and try to avoid this urge.
Use Temporal, StepFunctions, something and try to avoid this urge.