Deep familiarity building and maintaining integrations to major CRM and MAP platforms, including their data models, API constraints, rate limits, webhook patterns, and sync reliability challenges - with specific experience across Salesforce, HubSpot, and Microsoft Dynamics 365. Solid understanding of modern auth protocols in the context of third-party integrations, including OAuth 2.0, JWT, and API key management - with experience handling token lifecycle, scopes, refresh flows, and multi-tenant credential management.