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Why I wrote the BEAM book
The story behind writing The BEAM Book—ten years, three publishers, and an open‑source sprint.
Posted: 2025-06-03 After ten years of keeping Klarna’s core system upright I know this: a 15 millisecond pause in the BEAM can stall millions of peak-shopping payments, trigger a 3 a.m. Christmas-Eve post-mortem, and earn you a very awake call from the CEO. Performance tuning: What matters when profiling real code, understanding reductions, and tracking down real-world latency problems. If your team wants a deep dive, I run hands-on BEAM internals workshops, tailored for real systems, not just hello world.
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