Senior Machine Learning Engineer

### Who you are
- Master’s or Bachelor’s degree in Computer Science, Machine Learning, Artificial Intelligence, or a related technical field
- 2+ years of hands-on experience developing agentic systems utilizing Large Language Models (LLMs)
- 3+ years of experience building scalable, production-grade backend systems in Python (or Go, Javascript)
- 5+ years of experience in machine learning and statistics, with a proven track record of building products leveraging LLMs, ML, CV, or NLP models
- Strong communication skills, with demonstrated experience collaborating directly with product teams to design and elevate AI-driven features
- A proactive approach to learning, staying informed by taking an active interest in emerging AI research and industry trends
- Master’s degree or Ph.D. in Computer Science, Machine Learning, Artificial Intelligence, or a related field
- 3+ years of specialized experience developing complex, multi-agent systems using LLMs
- Strong product intuition and a refined taste for delivering exceptional user experiences
- Comfort thriving in a lean, fast-moving team environment; a willingness to dive in, take bold initiative, and own complex problems
- A genuine passion for shipping products that surprise, delight, and engage users
- A track record of publishing research at top-tier AI/ML conferences (e.g., ACL, NeurIPS, ICML, ICLR, AAAI, EMNLP, NAACL)

### What the job involves
- We are seeking a highly motivated and passionate Senior Machine Learning Engineer to join our core AI team in San Francisco, CA
- This is a high-impact role where you will take end-to-end ownership of the research and development behind our core AI avatar chat systems
- You will drive the technical roadmap that defines the intelligence, personality, and interactivity of millions of AI avatars
- By tackling fundamental technical challenges, you will bring fun, autonomous, and inspiring AI companions to life
- Working alongside a dedicated team of engineers and researchers, you will bridge the gap between cutting-edge AI research and real-world, consumer-facing product impact
- Research and implement state-of-the-art solutions using foundation models, prompt engineering, RAG, knowledge graphs, and multi-agent architectures, alongside classical machine learning techniques for a multi-modal AI chat product
- Architect, implement, and deliver scalable AI features and agentic systems within our backend systems
- Design and execute rigorous quantitative benchmarks to evaluate and continuously improve agentic systems and AI features
- Partner with the product team to iterate on and refine AI systems based on user feedback and engagement metrics
- Work closely with AI researchers to seamlessly transition experimental research outputs into robust, production-ready backend systems
- Define, implement, and enforce best practices for AI agent quality assurance, safety, and cost control
- Fine-tune and train LLM/ML models when off-the-shelf options are inadequate
- Remain at the forefront of academic and industry research in LLMs and AI agents, actively identifying and prototyping novel techniques to advance our technology stack

### Benefits
- You'll work with a team that you’ll be able to learn from and grow with, including support for your own professional development
- You'll be at the helm of your own career, shaping it with your own innovative contributions to a nascent team and product with flexible hours and a work from home policy
- You'll enjoy the culture and perks of a startup, with the stability of being well funded
- Comprehensive health insurance for you and your family (Anthem + Kaiser Options Available), Dental and Vision Insurance
- Competitive salaries and 401K program for all full time employees
- Flexible paid time off, sick time, monthly mental health days and paid company holidays; in addition to paid parental leave, bereavement leave, and jury duty leave for full-time employees
- Health & wellness support through programs such as monthly wellness reimbursement
- Working in a brand new, bright, open-environment and fun office space - there’s even a slide!
- Choice of MacBook or windows laptop