MarTech / Advertising Platform API Integration Developer

We are looking for an experienced MarTech or AdTech integration developer to design and implement integrations between an existing customer data platform and multiple advertising platforms. Our platform stores first-party customer data and creates audience segments from uploaded lists and dynamic segmentation rules. The missing capability is an integration layer that can synchronize these audience lists with platforms such as Google Ads, Meta, TikTok, and potentially X, LinkedIn, or other major advertising platforms. The main use cases are: * Sending selected audiences to advertising platforms for retargeting * Excluding or suppressing selected audiences from advertising campaigns * Keeping audience lists updated * Handling authorization, uploads, matching status, errors, retries, and platform-specific limitations This is a technical backend/API integration project. The initial work should include: * Reviewing the use cases and technical requirements * Assessing the APIs, authentication, permissions, and approval requirements of the relevant platforms * Recommending a maintainable multi-platform integration architecture * Defining a common audience-sync model with platform-specific adapters * Building an initial proof of concept with one or two platforms * Documenting limitations, required accounts, and the recommended implementation path We are looking for someone who has personally built integrations with advertising or marketing APIs, preferably including Google Ads, Meta Marketing API, TikTok Ads API, LinkedIn Marketing API, X Ads API, or similar platforms.