We&#x27;ve hooked up lambda to boot &quot;on-demand&quot; Celery (<a href="http:&#x2F;&#x2F;www.celeryproject.org&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.celeryproject.org&#x2F;</a>) workers. Allows us to scale up workers (for async task processing, etc.) in ~1-3 seconds vs the ~3-5 minutes it takes to boot EC2 instances for extra capacity.