BrillMark
BrillMark builds, QAs, and analyzes feature flag and A/B test implementations for CRO agencies and brands, pairing AI-assisted test prioritization and automation with hands-on engineering across any testing platform.
About BrillMark
BrillMark builds, QAs, and analyzes experiments for CRO agencies and brands, functioning as an embedded technical extension of their teams. Founded by Abdullah Mashuk, the distributed team spans India, Bangladesh, and the USA and has run more than 10,000 test campaigns for 200+ agencies and brands, including GrowthHit, FunnelEnvy, and Test Triggers, with three of the top 10 CRO agencies among its clients.
Services cover the full experimentation stack: A/B and multivariate testing, feature flag implementation, personalization, split URL testing, and both server-side and client-side testing, plus Shopify/WordPress development, cross-browser and device QA, and analytics setup on GA4, GTM, and similar tools. BrillMark also builds custom AI agents to automate repetitive testing and site tasks. It uses AI-assisted forecasting to help prioritize which tests to run first.
How BrillMark works with GrowthBook
BrillMark is a platform-agnostic test development team that builds and QAs feature flags and experiments directly inside GrowthBook. The team handles implementation across the full experimentation stack:
- Writing and QAing A/B and multivariate tests
- Configuring feature flags
- Running server-side and client-side testing
- Connecting GA4, GTM, and other tracking
BrillMark gives teams extra development capacity to stand up or scale a GrowthBook program without hiring in-house.
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