Do Appian has provided a course for Appian L2 Certification?
I am unable to find it.
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1. Learn all the topics mentioned on this page -> https://community.appian.com/learn/certifications/p/senior-developer
2. There used to be a practice test, try to take it multiple times. Once you are confident go for the certification.
All the very best !!!
In Appian academy they provided online courses for Senior Developer https://academy.appian.com/