Vault is a great option if you've already got the infrastructure.
Vault is my preferred solution for anything key related. Extendable to everything still relying on keys, not just lambdas.The vault plug-in for Jenkins is a life saver.
since many comments mentioned vault I googled for comparisions and found this interesting article: epsagon.com/blog/aws-lambda-and-se... which also touches the aws limits on ParameterStore.
IMO, vault should only be used in enterprises. Preferably a dedicated team just to handle vault
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