Conversion Tracking Expert (GA4 / GTM / BigQuery)

Marketing Measurement & Lead Attribution Architecture (GA4, GTM, BigQuery & Pipedrive) We are looking for a senior specialist who can help us design the architecture of an end-to-end marketing measurement and lead attribution system. This is NOT a simple GA4 or GTM setup project. We already have an internal developer who will implement APIs, backend logic, BigQuery integrations, Apps Script, SQL queries, dashboards and Pipedrive automation. What we need is someone with strong expertise in marketing analytics who can help us design the overall measurement framework and define the correct tracking strategy before implementation. About our business We provide international corporate services related to Hong Kong, Singapore and China. Our leads come from multiple channels: Google Organic Search Google Ads Direct traffic Referrals Website contact forms Google Calendar bookings WhatsApp Telegram We also operate several websites that should be measured as part of one ecosystem. Our goal We want to build a reliable measurement system that allows us to understand the complete customer journey. For every customer we would like to know: Where they originally came from Which campaign or channel generated the visit Which pages and articles they visited How many sessions they had before contacting us Which article or landing page contributed to the enquiry Which channel generated the lead (form, WhatsApp, Telegram, Calendar, etc.) How the lead progressed inside Pipedrive Revenue generated from the customer Customer LTV Cost per lead and cost per acquisition Content performance (which articles generate qualified clients and revenue) Current technology stack Tilda websites Google Tag Manager Google Analytics 4 BigQuery Pipedrive CRM Google Sheets Apps Script SQL Looker Studio What we expect from you We are looking for someone who can help us: Design the overall measurement architecture Design an event tracking strategy Recommend GA4 and GTM implementation best practices Design lead attribution logic Design cross-domain tracking Recommend how data should be stored inside BigQuery Recommend how website data should be connected with CRM and revenue Review our current approach and identify missing pieces Help us avoid common implementation mistakes We are not looking for someone who simply installs GA4 or GTM tags. We are looking for someone who understands how to build a scalable marketing analytics system that can be used for many years. Initially we would like to start with a consultation and architecture review. If everything goes well, this may become a long-term collaboration throughout the implementation process.