Sr Lead AI Research Scientist, AI Foundations
Upwork(7 days ago)
About this role
As a Sr Lead AI Research Scientist on the AI Foundations team, you will design and research novel algorithms for building reliable AI models to support Upwork's flagship AI model, Uma. The role focuses on developing core AI capabilities and enabling embedding-based retrieval loops and multi-agent setups, with an expectation of publishing at top AI conferences. This position is tied to Upwork's new international hub in Lisbon and will initially be employed through a partner.
Required Skills
- Python
- PyTorch
- Algorithm Design
- LLMs
- Generative AI
- Evaluation Methods
- Uncertainty Detection
- Hallucination Mitigation
- Embeddings
- Multi-Agent
Qualifications
- PhD in Relevant Field
About Upwork
upwork.comUpwork is a global freelancing marketplace that connects businesses of all sizes with independent professionals across design, development, writing, marketing, customer support, and more. Clients can post projects or search curated talent, review proposals, and manage engagements with contracts, time-tracking, invoicing, and escrow-backed payments. The platform also provides collaboration tools and enterprise features (talent sourcing, compliance, consolidated billing) to scale contingent work. Companies use Upwork for access to a large talent pool and standardized workflows, while freelancers benefit from job matching, portfolios, and secure payment systems.