UI review for engineering leads

You own merge velocity and the quality bill after merge. UI-affecting PRs are where those conflict: the team cannot manually QA every change, and source-only review still misses product failures. Diffraction is private MVP / design-partner ready UI review (product experience review) for UI-affecting GitHub PRs on web apps. Findings are aberrations with evidence. Tagline: See the full spectrum of every diff.

Aberration (eng-lead framing): An aberration is a verified product-experience failure found while reviewing a running UI: the post-merge surprise you would rather catch at the PR boundary.

UI review at team scale: UI review is the practice of checking UI-affecting PRs as running product experiences so the team gains confidence without staffing a human click-through on every diff.

Your team ships web apps through GitHub. UI surface area is large. Agent PRs raise volume. Preview links and a glance of approval do not scale into product confidence.

What you feel:

• Post-merge bugs that were never in the diff anyone argued about
• Inconsistent ownership: design reviews mocks, eng reviews code, QA samples if the ticket says so
• Pressure to move faster without a practice that catches product experience failures
• Tools in adjacent lanes (pixel baselines, source-only PR bots) that help, then stop short of whether the running change still works

Broken layouts may appear as one aberration among others. The job you need named is product experience review at the PR boundary, not another screenshot gate. Category: What is UI review?. Contrast: UI review vs visual testing.

Thesis: source correctness ≠ product correctness.

For design partners, Diffraction is aimed at reviewing the running PR head and returning verified aberrations with evidence reviewers can act on.

What that gives you as a lead:

• More confidence that UI-affecting PRs were experienced, not only read
• Efficiency: signal on the PRs that change product behaviour, without mandating full manual QA on every merge
• A shared language (aberrations, UI review) so the team stops collapsing three jobs into a visual glance
• Fewer post-merge surprises that burn the team's trust and your calendar

You still set standards, staffing, and merge policy. Diffraction is built for the gap between green checks and product truth. Terms: Glossary.

Put the practice on UI-affecting PRs. Keep ceremony low.

1. Define which PRs are UI-affecting (or let path heuristics surface them).
2. Diffraction (private MVP, design-partner scoped) exercises those PR heads as running experiences.
3. Aberrations return with evidence; authors and reviewers clear them like other merge blockers you choose to respect.
4. Design and QA can inspect the same evidence instead of screenshot ping-pong.
5. You measure fewer surprise-ship moments without hiring a human to click every PR.

Other roles: executives, designers and QA, and engineers.

Cautionary tales (product experience failures that process still missed):

Three checkboxes almost cost a billion dollars

Six people and a national signup flow

The button costing $300 million a year

If you lead an eng team shipping web apps on GitHub and want early design-partner access to a private MVP, email hello@diffraction.sh.

Tell us team size, how UI PRs get reviewed today, and where post-merge product failures still show up. Design-partner interest is welcome.

See the full spectrum of every diff.