David Harrison presents on Freelancer.com's use of cloud computing on Amazon Web Services (AWS) to scale their global online outsourcing marketplace. Some key points: - Freelancer.com connects over 2.6 million users from 234 countries to post and bid on projects. - They use AWS services like S3, EC2, EBS, and CloudFront to focus on their core business instead of managing infrastructure. - By using AWS, Freelancer.com has been able to efficiently scale their systems to meet the needs of their growing global user base.