Senior Fullstack Engineer - Core & Ad Platforms

Responsibilities: Own a blended scope across core HellYeah product engineering and ad-platform integrations. Build and maintain fullstack product features, backend business logic, and frontend flows while also driving Meta / TikTok connector work, server-side postbacks, and ad-account provisioning automation. Write technical designs, lead discussions, and execute independently across both product and integration surfaces. Must Have: 1. Strong TypeScript production experience building fullstack systems. 2. Experience with React / Next.js on the frontend and Node.js services on the backend. 3. Experience integrating complex third-party APIs, including OAuth, webhooks, rate limiting, and event-driven workflows. 4. Experience with Postgres / Supabase / Firebase, Docker, and production-quality engineering practices. 5. Ability to own both core product engineering and ad-platform integration work in a fast-moving environment. Nice to have: 1. Meta Marketing API or TikTok Marketing API experience. 2. Ad-tech / growth-tech or attribution background. 3. Conversions API / server-side postback experience. 4. Python or Go. 5. Kubernetes / AWS / CI-CD / observability. 6. AI-first development workflow and ability to ship quickly with modern coding tools.