https://lorenzovangi.com/writing/ Every piece I publish, newest first: The Converging Line on Medium, and anything written for this site. en https://medium.com/the-converging-line/big-o-was-never-the-bottleneck-the-cache-line-was-d6457dbc1d8f https://medium.com/the-converging-line/big-o-was-never-the-bottleneck-the-cache-line-was-d6457dbc1d8f Sat, 01 Aug 2026 14:22:19 GMT Two independent variables, two threads, zero shared state, and half the throughput gone. A short tour of why, in low-latency Java, the memory layout beats the algorithm. coding hft low-latency mechanical-sympathy https://medium.com/the-converging-line/your-hft-edge-was-never-c-its-the-cable-f963ea965782 https://medium.com/the-converging-line/your-hft-edge-was-never-c-its-the-cable-f963ea965782 Tue, 21 Jul 2026 09:01:03 GMT A vendor cost guide told me the language was the moat. A CTO I deeply respect told me what it left out — and almost none of it is code. finance fintech high-frequency-trading technology software-engineering https://medium.com/the-converging-line/python-and-java-concurrency-in-2026-two-languages-two-philosophies-one-problem-f638026772dc https://medium.com/the-converging-line/python-and-java-concurrency-in-2026-two-languages-two-philosophies-one-problem-f638026772dc Tue, 26 May 2026 10:01:02 GMT The GIL is finally optional. Project Loom is stable. Here’s what concurrency actually looks like in both languages today. Real benchmarks and no religious wars. performance-engineering software-engineering performance-optimization python java https://medium.com/the-converging-line/project-panama-the-end-of-jni-and-the-beginning-of-real-native-java-757849584fe4 https://medium.com/the-converging-line/project-panama-the-end-of-jni-and-the-beginning-of-real-native-java-757849584fe4 Mon, 18 May 2026 07:57:56 GMT Java has had a native interop story since 1.1. It was always broken. FFM API, finalized in Java 22, finally fixes it without a single line of C glue code. performance-engineering ffm jvm project-panama low-latency https://medium.com/the-converging-line/we-gave-claude-code-access-to-our-entire-stack-heres-what-the-workflow-looks-like-now-7920bb247f82 https://medium.com/the-converging-line/we-gave-claude-code-access-to-our-entire-stack-heres-what-the-workflow-looks-like-now-7920bb247f82 Sat, 09 May 2026 16:00:57 GMT From ticket creation to production deploy: one conversation, eight phases, zero context switching. software-engineering devops platform-engineering developer-tools artificial-intelligence https://medium.com/the-converging-line/building-a-fix-4-4-lp-integration-with-quickfix-j-every-decision-that-actually-mattered-3448a0f79767 https://medium.com/the-converging-line/building-a-fix-4-4-lp-integration-with-quickfix-j-every-decision-that-actually-mattered-3448a0f79767 Thu, 16 Apr 2026 07:01:04 GMT From custom DataDictionary to zero-reflection message dispatch — what the documentation doesn’t tell you about FIX connectivity in production. fix-protocol algorithmic-trading software-architecture financial-technology java https://medium.com/the-converging-line/what-kubernetes-doesnt-tell-you-until-it-breaks-in-production-14e5fd0b88ac https://medium.com/the-converging-line/what-kubernetes-doesnt-tell-you-until-it-breaks-in-production-14e5fd0b88ac Sun, 12 Apr 2026 18:18:40 GMT Scaling that made things worse, self-healing that hid the real bug, and a deployment that was technically correct but left the system inconsistent. Three lessons from the field. kubernetes software-engineering site-reliability-engineer cloud-computing devops https://medium.com/the-converging-line/pair-programming-vs-code-review-why-the-future-of-coding-is-still-about-collaboration-7a38defff449 https://medium.com/the-converging-line/pair-programming-vs-code-review-why-the-future-of-coding-is-still-about-collaboration-7a38defff449 Tue, 15 Jul 2025 09:10:45 GMT pair-programming programming-style code-review-process technology