Muhammad Shahid
AI Automation & Systems Architect: AI Agents | N8N Developer
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Engineered an automated n8n workflow that runs daily to fetch, paginate, and process large datasets (500+ records across multiple pages) from external APIs without triggering rate limits (429 errors). The workflow performs date-math comparisons against previous periods, aggregates totals, writes the structured data to Google Sheets, and dispatches a summary report via Gmail.
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This automated n8n pipeline ingests invoice and receipt PDFs from Gmail or Google Drive, extracts raw text via OCR, and uses an LLM to parse structured fields (vendor, date, line items, total, and currency) into validated JSON. A custom code node then verifies the schema and performs a math check on the totals. Verified data is automatically logged to Google Sheets, while messy scans, math errors, or low-confidence outputs are safely routed to a human review queue with the original file attached.
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Two-Way Sync with Conflict Resolution
Built a reliable bidirectional synchronization workflow between Notion and Google Calendar using n8n.
The workflow detects changes on either side, compares modification timestamps, resolves conflicts using the latest-change-wins approach, and updates the other system without creating duplicate records or infinite sync loops.
Key capabilities:
Bidirectional Notion ↔ Google Calendar synchronization
Last-modified timestamp conflict resolution
Persistent sync-state tracking
Loop/echo prevention
Duplicate prevention
Conflict logging
Idempotent execution
Tested for: state persistence, idempotency, timestamp comparison, simultaneous edits, duplicate prevention, and loop prevention.
Tools: n8n · Notion API · Google Calendar API
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Built a production-ready multi-client automation using n8n, PostgreSQL, secure webhooks, reusable sub-workflows, retry logic, and global error handling. The system automatically retries failures and sends detailed alerts instead of failing silently.
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