Automate Post-Interview Feedback Reminders Using Google Sheets, Slack, and Gmail

This n8n workflow automates post-interview feedback reminders by checking a Google Sheet for pending feedback and notifying interviewers via Slack or email. It helps HR teams and hiring managers collect feedback on time without manual follow-ups.

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Who’s It For

• HR and Talent Acquisition teams
• Recruitment coordinators
• Engineering, Design, and Product leads conducting interviews
• Anyone managing interview feedback using Google Sheets and Slack

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How It Works

1. Schedule Trigger runs daily (for example, at 6:00 PM).

2. Fetch Data reads interview entries from Google Sheets.

3. Filter Logic identifies rows where feedback has not been submitted.

4. Notification Routing:

   • If a valid Slack ID exists → send a Slack DM reminder
   • If no Slack ID → send a Gmail email reminder

5. Update Status marks the reminder as sent to prevent duplicate notifications.

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How to Set Up

1. Create a Google Sheet with columns such as:

   • candidate_email
   • interviewer_email
   • feedback_submitted
   • slack_id
   • reminder_sent

2. Connect Google Sheets, Slack, and Gmail credentials in n8n.

3. Configure the Schedule Trigger (daily, weekdays only, or custom time).

4. Map the correct columns in each node (Slack ID, email, status fields).

5. Test the workflow and activate it.

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Requirements

• n8n account (cloud or self-hosted)
• Google Sheets with structured interview data
• Slack workspace with a bot token that can send DMs
• Gmail account connected to n8n for email reminders
• Interviewers listed with a valid Slack ID or email address

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How to Customize

• Change the reminder schedule (hourly, weekdays only, or multiple times a day)
• Customize Slack and email message templates
• Handle multiple interview types or roles
• Add retry counts or escalation logic
• Extend notifications to Microsoft Teams, WhatsApp, or SMS

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Add-Ons

• Reminder timestamps – Log exactly when reminders are sent
• Multi-language templates – Send reminders in the interviewer’s preferred language
• Feedback form links – Include Google Form or internal tool links
• Notion or Airtable sync – Track reminders across additional tools

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Use Case Examples

• Recruiters ensure interview feedback is collected within 24 hours
• Engineering managers automate panel feedback reminders
• HR teams scale hiring during peak recruitment without manual follow-ups

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Common Troubleshooting

Issue	Possible Cause	Solution
Reminders not sending	Schedule trigger not firing	Verify schedule settings and timezone
Slack messages not delivered	Missing or invalid Slack ID	Ensure correct Slack IDs in the sheet
Emails not sent	Gmail not authorized	Reconnect Gmail credentials in n8n
Repeated reminders	Reminder status not updating	Confirm the sheet update step is working
Slack bot errors	Insufficient permissions	Grant the bot permission to send DMs

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Need Help?

Need help setting up or customizing this workflow for your hiring process? The n8n automation experts at WeblineIndia can assist with configuration, message templates, integrations, and scaling your feedback reminder system.