Marketing Attribution Specialist: Meta CAPI, Google Ads API, HubSpot (Non-Standard Conversion Flow)

We need an expert to audit and help finish up our ad platform conversion tracking so that attribution actually works end-to-end. Our conversion event is not a typical e-commerce checkout. It is a custom offline event: a lead comes in from an ad (all tracked and connected in HubSpot) and becomes a "customer" when we upload them into HubSpot as part of a list at a later time. We need someone who understands how to connect that broken chain, not just someone who has set up a standard Shopify or WooCommerce pixel. Current State: - Meta: CAPI is sending events into Events Manager successfully, but those events are not connected to Custom Conversions, so we can't use them for optimization or reporting the way we need to. - Google Ads: Enhanced Conversions / Conversion API pipeline is connected and technically accepting events (HTTP 200 responses), but conversions are not attributing back to the campaigns or keywords that drove them. - HubSpot: All the underlying data exists (contact source, original ad click info, lifecycle stage, list uploads), but it is not connected in a way that ties an ad click to an eventual customer upload. We are not looking for someone to start from scratch. We are looking for someone to find the gaps in an existing build and close them. What You'll Do - Audit our existing Meta CAPI implementation and connect fired events to Custom Conversions so they're usable for optimization and Ads Manager reporting. - Audit and fix our Google Ads API / Data Manager API connection so conversions attribute correctly to campaigns, ad groups, and keywords, not just "accepted but orphaned." - Design and build the HubSpot side of the attribution chain: mapping ad click and first-touch data through to lifecycle stage changes and list uploads, so a customer record can be traced back to the ad and campaign that originated it. - Recommend and implement the right workflow triggers (HubSpot workflows, properties, or custom code actions) to keep this pipeline automatic going forward, not a manual reconciliation process. - Document what you build clearly enough that our internal team can maintain it. Must-Have Experience - Hands-on experience with Meta Conversions API (CAPI), specifically connecting server-side events to Custom Conversions (not just firing events into Events Manager). - Hands-on experience with the Google Ads API or Data Manager API for offline/enhanced conversions, and troubleshooting why accepted events don't attribute to campaigns. - Strong HubSpot experience: workflows, custom code actions, lifecycle stage mapping, and ideally HubSpot Journey Analytics. - Experience with non-standard, non-checkout conversion events (lead-to-customer via CRM upload, B2B sales cycles, offline conversions, or similar delayed/manual conversion events). - Comfortable working with hashed PII (SHA-256 email/phone matching) for privacy-safe API sends. How to Apply In your proposal, do not send a generic pitch. Answer this directly: - Describe a project where you connected server-side (CAPI) events to Custom Conversions in Meta or Google Applications that don't answer this will not be considered.