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Recently, we profoundly refactored the engine that drives Duolingo lessons. This post talks about our engineering choices, experiences, and the pain points of rewriting a highly complex system. Highlights: * Redesigned architecture * Refactored code from Python to Scala * Latency dropped from 750ms to 14ms * Engine uptime increased from 99.9% to
git - What are the negative consequences of setting `feature.manyFiles` for small to mid-size repositories? - Stack Overflow
git provides a feature.manyFiles option that intends to make experiences in large repository smooth. What would be the consequences of turning it on also for small to mid-size repositories, such as...
Running your engineering onboarding program. | Irrational Exuberance
Most companies say that it takes three to six months for newly hired engineers to fully ramp up. Engineering leaders know it’s impolitic to admit that it takes their team longer than three to six months to onboard new engineers, so that’s what they say out loud, but they generally believe it takes longer for a new engineer to become fully productive. They also know that their most impactful engineers are still becoming more productive after years with the company.