Why Separating QA Code from Dev Code in Your Monorepo is a Game-Changer for E2E

On March 21st, a developer published a post on Dev.to making a case that most engineers working in monorepos have probably felt intuitively but never bothered to formalise: your QA automation code and your application code are not the same kind of thing, and treating them as if they live in the same conceptual neighbourhood creates quiet, persistent problems. The argument is structural. Extract your Playwright configurations, page objects, fixture files, and test utilities into their own dedicated space within the monorepo — not scattered across feature folders, not tucked beside the components they happen to test, but housed separately with their own dependency graph and their own reason for existing. The post scored a modest 6.0 on Dev.to, which tells you it found a small audience who recognised the problem even if it hasn't yet sparked a broader conversation. The idea itself is not new. Monorepo practitioners have wrestled with boundary-drawing for years, and the tension between "everything together for convenience" and "separation for clarity" is as old as the pattern itself. What gives this particular post some traction is the specificity: it's not a philosophical argument for clean architecture, it's a practical claim about end-to-end testing workflows, where the costs of blurred boundaries show up most visibly — in CI pipelines that run tests when they shouldn't, in dependency updates that break test tooling for reasons unrelated to the application, in developers who can't tell at a glance where the product ends and the test harness begins.

If confirmed as a genuinely productive pattern, here is what this means. Teams running Playwright or Cypress suites inside growing monorepos would have a concrete structural template to argue for when the "just put it next to the code" instinct kicks in. The second-order effect is more interesting: clear separation makes QA engineers first-class citizens of the repository architecture rather than guests in someone else's folder structure, which changes how test ownership conversations happen and how QA tooling evolves independently of the release cycle. For platform teams managing monorepo tooling at scale — Nx, Turborepo, Bazel setups — explicit QA boundaries also mean more precise caching and task graph definitions, which is where the CI time savings actually live. The strategic implication is modest but real: organisations that treat test infrastructure as a product rather than an afterthought tend to ship with more confidence, and this kind of structural decision is where that attitude gets encoded.

Watch for other engineers publishing follow-up experiences — positive or critical — that either validate the CI pipeline benefits in concrete numbers or surface the coordination costs this separation introduces. A second credible source would move this out of background noise entirely.

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