Senior ML Engineer - Remote, Build Core ML Infra

Primer is building the infrastructure for global payments. You will be the first Senior ML Engineer, shaping ML foundations, collaborating with engineering, data, and product to apply ML in payments. You'll own end-to-end ML features, productionize decisions, and mentor peers in a remote-first, highly impactful team. You'll work with AWS/GCP/Azure, explore reinforcement learning, and help define how ML is used to improve routing and outcomes for merchants.