diff --git a/.github/workflows/post-merge-validation.yml b/.github/workflows/post-merge-validation.yml
new file mode 100644
index 00000000..04ae14d7
--- /dev/null
+++ b/.github/workflows/post-merge-validation.yml
@@ -0,0 +1,102 @@
+name: Post Merge Validation
+
+permissions:
+  pull-requests: write
+  contents: read
+
+on:
+  workflow_call:
+    inputs:
+      repo-owner:
+        description: The repo owner
+        required: true
+        type: string
+      repo-name:
+        description: The repo name
+        required: true
+        type: string
+      pr-number:
+        description: The number of the merged PR
+        required: true
+        type: string
+      pr-author:
+        description: The PR author username
+        required: true
+        type: string
+      pr-title:
+        description: The PR title
+        required: true
+        type: string
+
+jobs:
+  post-merge-validation:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Post Feature Validation Checklist
+        uses: actions/github-script@v7
+        env:
+          OWNER_NAME: ${{ inputs.repo-owner }}
+          REPO_NAME: ${{ inputs.repo-name }}
+          PR_NUMBER: ${{ inputs.pr-number }}
+          PR_AUTHOR: ${{ inputs.pr-author }}
+          PR_TITLE: ${{ inputs.pr-title }}
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const {
+              OWNER_NAME: owner,
+              REPO_NAME: repo,
+              PR_NUMBER: prNumStr,
+              PR_AUTHOR: author,
+              PR_TITLE: title,
+            } = process.env;
+
+            const pull_number = parseInt(prNumStr, 10);
+
+            // Check if PR title starts with "feat" or "perf" (conventional commits)
+            const titleLower = title.toLowerCase();
+            if (!titleLower.startsWith('feat:') && !titleLower.startsWith('feat(') && 
+                !titleLower.startsWith('perf:') && !titleLower.startsWith('perf(')) {
+              console.log(`❌ PR #${pull_number} title doesn't start with feat or perf - skipping.`);
+              return;
+            }
+
+            const body = `Hi @${author},
+
+            on the day following \`feat\` or \`perf\` PR merge, PM and author to test changes on main (feature + exploratory around the edges) using the latest [nightly build](https://consensys.slack.com/archives/C093JQSEPJL) with [casual user persona](https://consensyssoftware.atlassian.net/wiki/spaces/TL1/pages/400085221547/Mobile+User+Persona+Definition) and also a [power user persona](https://consensyssoftware.atlassian.net/wiki/spaces/TL1/pages/400085221547/Mobile+User+Persona+Definition) where performance might be a challenge. Please record the testing in a video, check the relevant post-merge checklist box below, and post the video in a comment at the bottom of this PR.
+
+            ### Author validation checklist
+            - [ ] Validated the changes in main branch using the nightly build
+            - [ ] Video shared
+
+            ### PM validation checklist
+            - [ ] Validated the changes in main branch using the nightly build
+            - [ ] Video shared
+
+            <!-- AUTO-VALIDATION-CHECKLIST PR:${pull_number} -->`;
+
+            // Post the comment
+            try {
+            await github.rest.issues.createComment({
+              owner,
+              repo,
+              issue_number: pull_number,
+              body
+            });
+            console.log(`✅ Validation checklist posted on PR #${pull_number}`);
+            } catch (error) {
+              console.log(`⚠️  Could not post comment: ${error.message}`);
+            }            
+
+            // Add the needs-validation label
+            try {
+              await github.rest.issues.addLabels({
+                owner,
+                repo,
+                issue_number: pull_number,
+                labels: ['needs-validation']
+              });
+              console.log(`✅ Added 'needs-validation' label to PR #${pull_number}`);
+            } catch (error) {
+              console.log(`⚠️  Could not add label: ${error.message}`);
+            }