No personal experience, but I've seen this happen before. Most recently, it was a senior-level TPM who switched to a mid-level SDE role, and who has since declined to pursue a promotion to senior. Assuming that you (a) are a good performer (because they'll be motivated to keep you around) and (b) have a good relationship with your manager (because they'll have to handle losing you as a senior IC), you should be able to discuss your options and, if it's possible to make the change in situ, hash out a transition plan.
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No personal experience, but I've seen this happen before. Most recently, it was a senior-level TPM who switched to a mid-level SDE role, and who has since declined to pursue a promotion to senior. Assuming that you (a) are a good performer (because they'll be motivated to keep you around) and (b) have a good relationship with your manager (because they'll have to handle losing you as a senior IC), you should be able to discuss your options and, if it's possible to make the change in situ, hash out a transition plan.