Senior Applied Machine Learning Engineer - Search & Recommendations

Upwork(1 month ago)

Lisbon, PortugalOnsiteFull TimeSenior$180,455 - $242,796 (estimated)Machine Learning

About this role

The Senior Applied Machine Learning Engineer at Upwork applies advanced machine learning and large-scale data techniques to improve the platform’s search, personalization, and recommendation experiences. The role focuses on building and optimizing ML systems, fine‑tuning LLMs and hybrid agentic solutions, and working closely with cross-functional partners to drive business impact. Initially hired through a partner for Upwork’s new Lisbon hub, the position may transition to direct employment with Upwork when the hub is established.

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Required Skills

Data Analysis
Feature Engineering
ML Systems
Recommendation Systems
Collaboration
LLMs
Transformers
Agents
Python
SQL

+5 more

Qualifications

Master's/PhD in Computer Science, Machine Learning, NLP, or Mathematics

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.