Automate post-interview feedback reminders using Google Sheets, Slack, and Gmail

Send Post‑Interview Feedback Nudges from Google Sheets to Slack (with Email Fallback)

This n8n workflow automates the process of sending post-interview feedback reminders to interviewers. It checks a Google Sheet daily for pending feedback entries and sends personalized Slack DMs or email nudges based on the availability of Slack IDs. It ensures consistent follow-ups and eliminates manual tracking.

Who’s it for

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

How it works

1. Trigger: The workflow starts every day at 6:00 PM using the Schedule Trigger.
2. Fetch Data: It reads a Google Sheet with interview entries via the Google Sheets (Read Sheet) node.
3. Check Feedback Submission: An IF node filters entries where feedback has not been marked as “Yes.”
4. Slack Check: Another IF node checks if a valid Slack ID is present.
   • If Slack ID exists: Sends a Slack DM reminder.
   • If Slack ID is missing: Sends a fallback reminder via email using Gmail.
5. Update Status: Updates the sheet to mark the reminder as sent, avoiding future duplicates.

How to set up

1. Prepare a Google Sheet with columns: candidate_email, interviewer_email, feedback_submitted, slack_id, reminder_sent.
2. Connect your Google Sheets, Slack, and Gmail accounts in n8n.
3. Set the Schedule Trigger to your preferred time (e.g., 6:00 PM).
4. Map the correct columns in each node.
5. Deploy and test the workflow.

Requirements

• A working n8n instance.
• Google Sheets with structured feedback data.
• Slack workspace and bot token with DM permissions.
• Gmail account connected to n8n for fallback reminders.
• Interviewers listed with either Slack ID or valid email.

How to customize

• Change the schedule (e.g., run hourly or on specific days).
• Customize Slack or Email message templates.
• Add conditional formatting for different interview types or roles.
• Integrate additional columns for logging timestamps or retries.
• Expand to MS Teams or other email providers.

Add‑ons

• Google Sheets Timestamping: Log the exact time when reminders were sent.
• Multi-language Reminder Support: Based on interviewer’s preferred language.
• Feedback Form Auto-linking: Embed Google Form links dynamically in messages.
• Notion or Airtable Integration: Extend tracking to other platforms.

Use Case Examples

• A recruiter managing 10+ interviews daily ensures feedback is collected within 24 hours.
• An engineering manager automates reminders for panelists to fill candidate scorecards.
• HR teams use it during hiring surges to eliminate feedback bottlenecks.

Common Troubleshooting

Need Help?

Need a hand setting this up or want to customize it further for your recruitment workflow? Just drop a message to our n8n automation team at WeblineIndia — we’re here to help streamline your hiring feedback process!