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Explore how Clojure and Datomic challenge the perception that functional programming is only for academic or hobbyist use in this 41-minute conference talk from Lambda Days 2025. Discover why Clojure, with its dynamic typing flexibility and functional programming rigor, paired with Datomic's immutable, time-aware data model, powers demanding production systems across fintech and e-commerce industries. Learn how this technology stack overcomes traditional concerns about dynamic typing and functional programming while delivering exceptional developer productivity and system resilience. Understand the practical advantages of combining dynamic flexibility with functional reliability, and see real-world examples of how these tools excel in production environments where performance and reliability are critical.