While there is a biannual performance review for the purpose of giving and receiving raises, there's currently no tangible plan that outlines a promotion track for SDRs at Fastly.
The odds are against you if you want to be considered for a promotion based upon merit alone. You need to befriend a reputable manager who will give you their blessing and take their personal time to help train you and to champion you internally to Sales Leadership.
The hiring manager and recruiter will tell you there's opportunity to be promoted from SDR to a closing sales role but as of the time of this writing, they're absolutely lying to you.