Research Engineer, Applied Research

📋 Description

• Tackle unsolved applied AI and ML problems, pushing the boundaries of post-training, voice AI, and
• Determine when to build specialized models vs. using externally provided frontier intelligence
• Turn ambiguous product and customer problems into well-framed machine learning problems
• Develop, fine-tune, evaluate, and deploy models that improve Sierra's customer-facing AI agents
• Advance post-training work from supervised fine-tuning toward reinforcement learning and
• Build rigorous evaluations connecting model performance to real-world agent quality

🎯 Requirements

• Strong experience building and deploying production machine learning and AI systems
• Excellent judgment in framing product problems as ML tasks and selecting the most effective approach
• Experience working deeply with data, experimentation, evaluation, and model iteration
• A practical, evidence-driven approach to ML with strong judgment
• Ability to operate with high agency and work across the stack
• Alignment with Sierra's values: Craftsmanship, Customer Obsession, Competitive Intensity

🎁 Benefits

• Flexible (unlimited) paid time off
• Medical, dental, and vision benefits for you and your family
• Life insurance and disability benefits
• Retirement plan dependent on country of employment
• Parental leave
• Fertility and family building benefits through Carrot