Senior Engineer, Machine Learning

Virta Health is on a mission to transform type 2 diabetes and weight-loss care. Current treatment approaches aren't working—over half of US adults have either type 2 diabetes or prediabetes, and obesity rates are at an all-time high. Virta is changing this by helping people reverse their metabolic condition through innovations in technology, personalized nutrition, and virtual care delivery reinvented from the ground up. We have raised over $350 million from top-tier investors, and partner with the largest health plans, employers, and government organizations to help their employees and members restore their health and take back their lives. Join us on our mission to reverse diabetes and obesity in one billion people. ABOUT THE ROLE As a Senior Engineer, Machine Learning on Virta's Applied AI team, you build the models that shape how Virta shows up for each member: who needs a coach's attention this week, which nudge will land, what moves someone closer to reversing their disease. You take a fuzzy clinical or operational question, sharpen it into something a model can actually answer, and carry it the whole way to production. You are hard to fool. A number that looks good on a slide doesn't convince you until you've checked what's underneath it: whether a leak inflated it, or whether it's quietly wrong for a segment it doesn't call out. You start simple, prove the baseline honestly, and add complexity only once it earns its place. Your models don't just ship, they stay healthy without you babysitting them. As Applied AI moves from linear to exponential, you build models on Virta's deep, longitudinal member data and put them on the ML platform that retrains them, watches their quality, and pulls you in only when something is genuinely wrong. What one engineer can deliver stops being capped by how many models they can keep alive. None of this happens solo. You hand models to product engineering to get them in front of members and care teams, lean on ML Ops's infrastructure to keep models running, sit with clinicians to pressure-test what the data is really saying, and work with Product Analytics to design experiments sharp enough to trust, and to separate what actually drives better outcomes from what only correlates with them. RESPONSIBILITIES - Problem Framing & Modeling: Turn ambiguous clinical and operational questions into well-scoped ML tasks, and build strong baselines before adding complexity. - Model Delivery at Scale: Build predictive models that drive member care, like who is at risk of disengaging, who benefits most from a coach's outreach, or where a member's health is trending. Partner with product engineering to put that signal in front of members and care teams. - Self-Maintaining Models: On top of the ML platform, build the per-model logic that keeps each model healthy in production (retraining triggers, drift and anomaly detection, continuous evaluation), with compliance considerations built in from the start. - Evaluation & Error Analysis: Design offline and online evaluations, choose metrics suited to imbalanced, delayed, and noisy healthcare outcomes, and run careful error analysis on model failures. - Causal ML & Experimentation: Build causal models validated against real clinical experiments, and partner with Product Analytics on variance-reduction techniques (CUPED/CUPAC) to sharpen experiment sensitivity on Virta's member history. - Signal Integration: Build ML-and GenAI-derived signals that product squads can consume to guide personalized coaching and member experiences. - Technical Leadership: Lead complex ML initiatives from problem framing through production, coordinating technical decisions and dependencies across Applied AI, ML Ops, Product Engineering, and Product Analytics. Shar