Senior Research Engineer, LLM Evaluation and Behavioral Analysis

Together AI is building the fastest, most capable open-source-aligned LLMs and inference stack in the world. As part of the Turbo organization, you will be a critical bridge between cutting-edge model research and real-world behavioral reliability. This role focuses on deeply understanding model behavior — probing reasoning, tool use, function calling, multi-step interactions, and subtle failure modes — and building the evaluation systems that ensure models behave intelligently and consistently in production. You will develop robust evaluation pipelines, design high-quality behavioral test suites, and work closely with training, post-training, inference, and product teams to identify regressions, shape datasets, and influence model improvements. Your work will directly define how Together measures model quality and reliability across releases.