Riah Amhari — Experimentation EngineerA/B test development and experimentation engineering for CRO teams and e-commerce brands. Based in London, working worldwide.https://riahamhari.com/en-gbQA-ing A/B tests inside shadow DOM: why your selectors lie to youhttps://riahamhari.com/blog/shadow-dom-qa/https://riahamhari.com/blog/shadow-dom-qa/Shadow roots silently break querySelector-based test code and most QA tooling. Here's what's actually happening and how to write tests that work inside web components.Tue, 10 Mar 2026 00:00:00 GMTtechnicalQAshadow DOMweb componentsDOM-injected vs flag-based experimentation: what changes when you go server-sidehttps://riahamhari.com/blog/dom-vs-flag-based-experimentation/https://riahamhari.com/blog/dom-vs-flag-based-experimentation/A practical comparison of client-side DOM manipulation and server-side flag-based testing — the trade-offs, the migration path, and what actually changes for the developer.Sun, 01 Feb 2026 00:00:00 GMTtechnicalarchitectureserver-sideflagsWhy your A/B test flickers — and how to actually fix ithttps://riahamhari.com/blog/why-ab-tests-flicker/https://riahamhari.com/blog/why-ab-tests-flicker/Anti-flicker techniques demystified: why naive snippet placement causes visible page jank, what actually works, and why most implementations get it wrong.Thu, 15 Jan 2026 00:00:00 GMTtechnicalflickerQAoptimisation