Research Engineer

About the job

Responsibilities

• Lead research and engineering to enhance core conversational AI capabilities in production, including instruction following, tool calling, retrieval, and memory.
• Investigate research questions in speech and audio, and design experiments to test hypotheses about model behavior and capabilities.
• Build and iterate on end-to-end models and pipelines optimized for quality, efficiency, and user experience.
• Identify opportunities for model-task optimization, selecting appropriate model architectures based on performance, latency, and cost.
• Partner with platform and product engineers to integrate new models into production systems.
• Break down ambiguous research ideas into clear, iterative milestones and roadmaps.
• Train, fine-tune, validate, and further develop in-house and customer-developed models.
• Design evaluation protocols and benchmarks to measure model quality, generalization, robustness, and progress against research objectives.
• Analyze datasets, model outputs, and failure cases to guide the next round of model development.

Requirements

• 5+ years of experience, with a minimum of 3+ in AI/ML engineering or research.
• Prior experience post-training and deploying LLMs in production environments.
• Fluency in Python and modern ML tooling (training, evaluation, inference, data pipelines).
• Track record of taking research ideas from prototype to reliable, measurable production impact.
• Strong experimental judgment: formulating hypotheses, establishing useful baselines, designing evaluations, and interpreting results carefully.
• Experience utilizing and improving speech-to-text (STT), text-to-speech (TTS) models, and/or duplex models is a bonus.

Benefits

• Competitive compensation including salary and employee stock options.
• Annual budget for professional development and training opportunities.
• Office setup stipend.
• Top-tier health coverage (medical, dental, vision).
• Flexible PTO.
• Provided meals and snacks.
• Fitness stipend.
• Commuter benefits.
• 401(k) plan.