Yulius Arief, founder and COO of DevStack, gave a presentation on sustainable DevOps transformations. DevStack provides consulting, software services, and talent development. It has implemented various DevOps practices over time such as continuous integration in 2014, containerization in 2018, and plans to scale pipelines and engineers. DevStack's history shows its evolution from manual deployments in 2012 to continuous delivery, testing, and research to release in recent years. The presentation concluded by thanking the audience.