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

by WeblineIndia•Updated: Last update a month ago•Source: n8n.io

Getting Started

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

IssuePossible CauseSolution
Reminders not sendingSchedule Trigger not firingCheck cron expression or timezone settings
Slack messages not deliveredSlack ID missing or invalidEnsure Slack IDs are mapped correctly in the Sheet
Emails not sentGmail node not authorizedReconnect Gmail credentials in n8n
Entries repeatedly remindedSheet not updating after reminderConfirm Update node is marking reminder_sent as “Yes”
Slack bot errorsInsufficient permissionsEnsure bot has permission to send DMs

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!