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ProjectsN8N + AI Automation
N8N + AI Automation

AI-Powered Knowledge Bot (N8N + Gemini)

Built a self-hosted AI chatbot using N8N to process company PDFs from Google Drive, powered by Gemini API for NLU and PostgreSQL+pgvector for semantic search.

Industry: Internal Knowledge Management
Duration: 4 Weeks
Role: Lead Developer — Business Intelligence Automation
Status: Live in Production
100%
Data Privacy (Self-Hosted)
24/7
Digital Employee
Instant
Answer Retrieval
0
Cloud Data Transfer
The Challenge

Where It Started

Built a self-hosted AI chatbot using N8N to process company PDFs from Google Drive, powered by Gemini API for NLU and PostgreSQL+pgvector for semantic search.

Problems
  • Employees spending hours searching scattered PDFs and docs manually
  • No centralized, searchable knowledge base
  • Sensitive company data could not leave the premises
  • Existing SaaS AI tools required uploading data to third-party clouds
Our Solution
  • Self-hosted N8N processing Google Drive documents automatically
  • Gemini API for natural language question understanding
  • PostgreSQL + pgvector for accurate semantic search
  • 100% on-premise Ubuntu server — zero data leaves the building
Architecture

System Overview

User Query N8N Workflow Bot Orchestrator Gemini API NLU Processing PostgreSQL + pgvector Google Drive (PDFs) On-Premise Ubuntu Server 100% Data Privacy AI Response Digital Employee Self-hosted AI Knowledge Bot — company data never leaves your server
Implementation

How We Delivered It

Week 1
Infra & Data Pipeline
Set up the on-premise Ubuntu server and PostgreSQL with pgvector extension for vector embeddings.
Week 2
N8N Document Workflow
Built N8N workflows to read, chunk and embed company PDFs/documents automatically from Google Drive.
Week 3
Gemini Integration
Integrated Gemini API for natural language understanding, connecting user queries to semantic search results.
Week 4
Testing & Rollout
Validated answer accuracy across real employee queries and rolled out the bot as a 24/7 digital knowledge employee.
Tech Stack

Technologies Used

N8NGemini APIPostgreSQLpgvectorGoogle Drive APIUbuntu ServerPython
Results

The Impact We Delivered

100%
Data Privacy
Entirely self-hosted on-premise — no data ever leaves the client server.
24/7
Availability
The bot answers employee questions around the clock, no downtime.
Instant
Answer Retrieval
Semantic search via pgvector returns accurate answers in seconds.
Auto
Knowledge Base Sync
New Drive documents are automatically indexed without manual work.
"It genuinely feels like we hired a new team member who has read every document we own and never forgets anything — and our data never left our server."
— Operations Head, Internal Ops Team (Client, Confidential)

Project Details

IndustryInternal Knowledge Management
Duration4 Weeks
Team Size1 Engineer
RoleLead Developer — Business Intelligence Automation
StatusLive in Production

Services Used

N8NGemini APIpgvectorPostgreSQLOn-PremiseAI Agent
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Key Wins

  • 100% on-premise data privacy
  • 24/7 instant knowledge retrieval
  • Automatic Google Drive syncing
  • Semantic search via pgvector
  • Zero third-party cloud data transfer

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