Senior Machine Learning Engineer

Kard is building commerce media infrastructure that connects financial institutions, financial-services platforms, and merchants through data and merchant-funded rewards. As our reach expands, we are building for a step-change in scale, and for opportunities ranging from more relevant rewards and marketer intelligence to new commerce and distribution models.

### About the Role

As a Senior Machine Learning Engineer, you will design, build, and operate the production systems that turn machine learning into durable product capabilities. Your scope will span personalization and recommendations, optimization and decisioning, experimentation and measurement infrastructure, model training and serving, and the shared platforms and tooling that support ML development at Kard.

This is a senior individual-contributor role on the Data team, reporting to the Director of Data & Platform. You will work primarily with other machine learning engineers and data scientists, while partnering across Data and Product to move models from experimentation through deployment and ongoing operation. You will also provide technical leadership through architecture, engineering standards, mentorship, and design and code review.

### Responsibilities

• Design, build, and operate end-to-end machine learning systems across batch and real-time workloads, including feature generation, training, evaluation, deployment, inference, and retraining.
• Develop production capabilities for personalization, recommendations, ranking, optimization, contextual decisioning, experimentation, and measurement.
• Build reusable ML platforms, pipelines, frameworks, and tooling that improve reproducibility, self-service, reliability, and development speed.
• Own the operational lifecycle of production models, including observability, data and model quality, drift detection, performance monitoring, failure handling, retraining, and governance.
• Partner with other ML practitioners to t