Senior Machine Learning Engineer

As a Senior Machine Learning Engineer, you will build and own LLM-powered back-end services using FastAPI, Pydantic, ensuring they are scalable, observable, and easy to extend. You will design infrastructure that enables rapid experimentation with LLMs, including A/B testing, feature flagging, and usage analytics. You'll also integrate and maintain LLM observability tooling (e.g., LiteLLM, Langfuse) to monitor quality, cost, and performance of model calls. Collaboration is key, as you will work with Data and ML Scientists to productionize workflows, share feedback, and continuously improve experimentation speed. Ensuring system reliability is essential; you'll deploy systems with strong CI/CD practices, including instrumentation and alerting. Contribute to team culture through pairing, mentoring, and sharing learnings. Stay connected to the product by understanding our users' needs, localization workflows, and broader industry trends.