Senior Lead Machine Learning Engineer, Agentic AI

Upwork(1 month ago)

Toronto, Ontario, CanadaOnsiteFull TimeSenior$190,319 - $255,641 (estimated)Engineering

About this role

The Senior Lead Machine Learning Engineer will architect, ship, and scale agentic intelligence across Upwork, leading end-to-end work from LLM training and evaluation to runtime orchestration, safety, and developer APIs. This hands-on role sits at the intersection of applied research and platform engineering, enabling internal teams and external developers to build reliable, safe, and high-performing agents. The role includes technical leadership, cross-functional partnership, and mentoring of senior engineers while driving metrics-oriented improvements.

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Required Skills

Agentic Intelligence
Multiagent Systems
Tool Use
Prompting
LLM Training
Model Alignment
Data Curation
Safety Guardrails
Evaluation Harnesses
Runtime Orchestration

+27 more

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.