Ryan Delucchi Interview
summary
Verizon Labs uses free monads but finds trampoline overhead makes them too slow on hot paths, so teams replace them with finally tagless in performance-critical code; the Nelson project relies heavily on Scalaz Streams and exposes real concurrency pitfalls where mismanaged thread pools cause a batch job hang at shutdown; functional abstractions improve maintainability and onboarding, yet require targeted optimizations and attention to threading to make the system actually scale.
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