n8n Developer Needed for AI-Powered Opportunity Scoring & Workflow Automation System

I am looking for an experienced n8n developer to build a private AI-powered workflow automation system. The system will process structured opportunity records, evaluate each record using an AI model, store results in Google Sheets, and send a ranked daily Gmail briefing with recommended next steps. This is a personal productivity and decision-support workflow. The core build involves n8n automation, AI API integration, structured data handling, Google Sheets, Gmail, scheduling, error handling, and documentation. I already have the evaluation logic, scoring framework, and desired output structure. I need an experienced builder to turn the workflow into a reliable working system. PROJECT GOAL Build a scheduled n8n workflow that can: • Accept structured records from approved input sources that I provide • Apply basic filtering rules before AI evaluation • Send qualified records to an AI model using a provided prompt/framework • Parse the AI response into structured JSON fields • Write the results into Google Sheets • Prevent duplicate records • Send a ranked daily Gmail briefing • Include reliability safeguards, error handling, and basic logging MILESTONE 1 — CORE WORKFLOW Build the core n8n workflow: • Input handling from approved structured sources • Filtering logic • AI API integration using Claude, OpenAI, or similar • JSON parsing • Google Sheets storage • Gmail daily summary • Duplicate detection • Scheduling • Error handling • Retry logic • Short handoff documentation or Loom walkthrough MILESTONE 2 — DOCUMENT CUSTOMIZATION WORKFLOW After the core workflow is approved, build an on-demand document customization workflow. This workflow will: • Combine a master document with a selected opportunity record • Send the information to an AI model using a provided framework • Return a customized draft • Support a simple trigger method such as a Google Sheet checkbox, manual n8n trigger, or selected score threshold WHAT I WILL PROVIDE • Evaluation framework • Prompt logic • Desired output fields • Google Sheet structure • Filtering rules • Scoring threshold • Master document for customization workflow • Approved input method, which may include structured feeds, APIs, Google Sheets, exported records, or approved public data extraction tools • Required account credentials after hire REQUIRED SKILLS • Strong n8n workflow development experience • API integration experience • AI API integration experience such as Claude, OpenAI, or similar • Google Sheets integration • Gmail integration • JSON parsing and structured data handling • Workflow scheduling • Error handling and retry logic • Duplicate prevention • Clear documentation and handoff • Familiarity with public web data extraction tools such as Apify or similar platforms is helpful, but not required IMPORTANT This workflow must be built using approved inputs and compliant methods. TO APPLY Please include: • An example of a production n8n workflow you have built • A short explanation of your experience with AI API integrations • A short explanation of how you handle workflow reliability when one input source fails or returns incomplete data • Your fixed-price quote and estimated timeline SCREENING QUESTION How would you design an n8n workflow that processes structured records from approved input sources, evaluates them with AI, stores results in Google Sheets, controls AI API costs, prevents duplicates, and continues operating smoothly when one input source has an issue? Please also mention any experience you have connecting n8n to external APIs, structured feeds, or public data extraction tools such as Apify or similar platforms. BUDGET Preferred fixed-price structure: Milestone 1 — Core Workflow: $1,100 Milestone 2 — Document Customization Workflow: $500 Total preferred budget: $1,600 I am open to reasonable adjustments if you can clearly explain the difference in scope.