We used "Laravel Nova" for the Dashboard and Spark for the subscription based payments.
The videos are converted with Amazon Elastic Transcoder and have two outputs -- the video and a GIF for the email message. As an error reporting service we're using SNS (Simple Notification Service) which notifies us if a transcoding fails.
We've also built a Warm Welcome Chrome extension, which connects directly with your Gmail account and allows you to record and email welcome messages directly from Gmail.
We have created WarmWelcome mobile app for iPhone and Android. This way when away from your computer you can still record and email warm welcome messages to your newly subscribed clients.