Service Clouds: AWS, Azure, GCP, etc.

If you want to showcase cloud management, a full nextcloud, with postgresql, redis, s3 main storage, elasticsearch, sso and a reverse proxy would show the use of multiple services from cloud providers. If you want to dev, a mini cloud (or mini youtube) is proably good enough, but I am no recruiting, just a junior.

Having yt-dlp save the videos to S3 will just add to your costs - what benefit will it provide to your users to get the file from S3 compared to Youtube?

My suggestion would be a price checker - create a webpage where users can enter in a URL for a product, an email address and a scrape recurrence time like 24hours, then have Lambda scrape the page & email the price to the user on that schedule. Use DynamoDB (or a relational DB like Postgresql) to save the results, schedule, etc.

Try not to use EC2 at all if possible. Or instead of EC2, use EKS if scraping with Lambda is too difficult.

Most important things is getting the security right.

So you have all these skills, but yet you can’t come up with something to demo? Sounds like a skills problem.