Arun Joseph, co-founder of Mosaic Agentic Systems, on reliable AI at AI By the Bay 2025. As head of AI engineering at Deutsche Telekom he led a team that put one of the first agentic platforms into production in late 2023, powering multiple European countries, and open-sourced it at the Eclipse Foundation in 2024 as Eclipse LMOS, a week before OpenAI released Swarm. A contributor to the original reliable AI definition, he defines it as outputs that are verifiable, reproducible, and consistent under real operational constraints, and sees reliability becoming an engineering discipline rather than model research alone. In five years he expects personal computing to blend deterministic and agentic computing on every device, and enterprises to run divisions on self-optimizing agentic systems.