web performance , causal inference , Statistical Analysis, Programming, Internet measurement, Network measurement, Internet access and digital inequality, Designing reproducible systems, Production-quality research software, AI-assisted optimization of Web and network performance, Active or passive measurements, web systems, LEO Satellites, Large-scale data collection, Large-scale Internet and Web measurements, Mobile and networked systems, Measurement-driven design, mobile systems, Distributed experimentation, Browser instrumentation, Multilingual Web experiences, Measurement studies, Quantitative-analysis skills