The IETF Hackathon in Buenos Aires on April 2-3 will focus on implementing the latest draft of TLS 1.3 and testing interoperability between existing implementations written in various languages. CloudFlare and Mozilla are working together to improve security and performance for HTTPS with this new version of TLS, which hasn't seen an update in eight years. Those interested in network programming and cryptography are encouraged to attend the hackathon or apply to join the CloudFlare team.