Hi, I'm Leni.

I lead engineering on real-time distributed systems. I write about what worked, what didn't, and the numbers behind both.

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Currently writing about

🤖 AI in engineering, measured

What changes when an agent becomes the daily driver. Throughput, cycle time, change-failure rate — with their caveats.

📺 Real-time streaming platforms

20 months building a platform for real-time quality analysis of video streams. Event-time semantics, the consistency boundary, the bugs that don't show up until production.

⚖️ Engineering judgment

Build vs buy, instrument-before-you-rollout, when to defer. The decisions that don't make it into postmortems but should.

📐 Architecture & infrastructure

Terraform at a startup, schema evolution, the database choices you regret six months later.

Latest

2× throughput, 2× failure rate: 20 months of measured AI adoption

Per-engineer PR throughput grew ~2× at flat review latency. AI co-authorship went 0 → 53% of commits. But review time quadrupled first — and change-failure rate doubled.

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Elsewhere