Augmented Development: FastDecimal by Andy Bailey

Andy Bailey dives into his experiment of building FastDecimal, a lean, SIMD-friendly replacement for Java’s BigDecimal that uses a 4-scale long for financial calculations. He taps into AI agents like ChatGPT, Claude Sonnet, Gemini and Junie to help write, review and benchmark code against BigDecimal—complete with JUnit tests and JMH performance checks.

Expect a candid rundown of his workflow: what AI tricks actually sped things up, the surprises that popped up (good and bad), and the dead ends that flopped. If time allows, he’ll even do some live prompting or coding—and take your questions!

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