Sr Lead Machine Learning Engineer

Upwork(27 days ago)

RemoteFull TimeSenior$195,000 - $308,000Applied Science

About this role

A Senior Lead MLE / Applied Scientist at Upwork will define how success is measured for AI agents in real-world tasks and build rigorous, reproducible evaluation frameworks. The role focuses on assessing human+AI collaboration outcomes, informing product and model roadmaps, and improving trust and quality in agentic systems. This is a cross-functional position that translates qualitative and quantitative signals into actionable insights to shape what the company ships.

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Required Skills

Evaluation Frameworks
Benchmarking Pipelines
Observability Tools
Instrumentation
Reproducible Evaluation
Statistical Analysis
Experimental Design
Human-AI Interaction
Data Pipelines
Distributed Processing

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About Upwork

upwork.com

Upwork 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.