Senior Lead Machine Learning Engineer, Agentic AI

Upwork(11 days ago)

Lisbon, PortugalOnsiteFull TimeSenior$183,013 - $246,435 (estimated)Machine Learning

About this role

A Senior Lead Machine Learning Engineer at Upwork will architect, ship, and scale the next generation of agentic intelligence across the company. The role covers end-to-end development of AI agents and the platform that powers them — from LLM training and evaluation to runtime orchestration, safety, and developer APIs. It is a hands-on position combining applied research and platform engineering to enable internal teams and external developers to build reliable, safe, and high-performing agents.

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Required Skills

Agentic Intelligence
Multi-Agent
LLM Training
Model Evaluation
Runtime Orchestration
Safety Guardrails
Developer APIs
Data Curation
RLHF
SFT

+10 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.

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