João
Barroca

Senior Data Scientist · Remote

GenAI for Services — partnering with customer units to prototype and ship generative-AI products that drive business value.

Built and shipped a live CV Optimizer Agent that lifted apply rate by 5%, with hallucination safeguards holding the error rate under 5% via real-time tracing evals.

Building a foundational agentic-commerce harness on a small set of primitives — MCPs, hooks, skills, and agentic memory.

Also building a foundational personalization layer that uses LLMs to turn structured and unstructured user data into rich semantic profiles.

Previously on Search & Discovery — learning-to-rank, query understanding, and hybrid search. Solved a critical multi-objective ranking problem, giving paid placements a guaranteed boost without trading away relevance.

Junior → Senior Data Scientist · Lisbon

Four years across Search and the Fashion Knowledge System: query understanding (NER & entity linking), search relevance, knowledge graphs, entity resolution, active learning, and visual-language modelling.

Grew from Junior to Senior, scaling NLP and information-extraction systems into production.

Several shipped with real revenue impact — a from-scratch spellchecker alone drove a multi-million-dollar GTV uplift.

SocRob@Home — Researcher · Lisbon

Built a spoken goal-oriented dialogue system for a service robot — natural-language understanding, dialogue state tracking, and dialogue management on a ROS stack.