Mateusz Opala
@mateuszopala
Staff Machine Learning Engineer specializing in production-grade LLM, retrieval, and agentic AI systems.
What I'm looking for
I am a Staff Machine Learning Engineer with 13+ years building and scaling production-grade ML and LLM systems, from research and modeling through deployment and iteration.
I have led architecture and delivery of agentic products and large-scale ML platforms, improving retrieval precision, reducing inference costs, and enabling safe, frequent releases via evaluation and gating. I founded and scaled ML teams, launched revenue-generating practices, and shipped end-to-end features serving hundreds of millions of users.
I focus on measurable impact—designing hybrid retrieval+neural+symbolic systems, establishing evaluation standards, and mentoring engineers to deliver robust, observable ML services in production.
Experience
Work history, roles, and key accomplishments
Led architecture and delivery of core agentic products (Deal Inspection Agent, Ask Clari, automated email generation), reducing manual deal review from hours to minutes and established evaluation and release gating enabling multiple safe releases per day.
Senior Machine Learning Engineer
Shelf
Oct 2023 - May 2024 (7 months)
Improved retrieval precision from ~40% to ~70% using neural reranking (RoBERTa; Mistral 7B via QLoRA) and replaced GPT-4 relevance scoring with in-house models to cut inference costs by orders of magnitude.
Lead Machine Learning Engineer
Brainly
Jan 2021 - Sep 2023 (2 years 8 months)
Led LLM-powered features for a global Q&A platform serving 350M+ MAU and designed hybrid AI systems (retrieval + neural + symbolic) that increased answer coverage from ~50% to ~80%.
ML Tech Lead
Netguru
Jan 2018 - Jan 2021 (3 years)
Founded and scaled the ML department from 0 to 8 engineers, defined ML project discovery and delivery processes, and built a revenue-generating ML practice achieving seven-figure annual revenue.
Co-founder & CTO
Craftinity
Jan 2016 - Jan 2018 (2 years)
Co-founded and served as CTO, led ML architecture and a team of 6 engineers to design and ship an ML-powered visual search and image-to-catalog matching system for fashion, enabling relevant product ads.
Machine Learning Intern
Siemens
Jan 2014 - Jan 2015 (1 year)
Implemented real-time CNN inference pipelines for medical imaging workflows, contributing to production-ready imaging solutions.
Education
Degrees, certifications, and relevant coursework
AGH University of Science and Technology
Bachelor of Computer Science, Computer Science
2010 - 2014
Completed a Bachelor of Computer Science with a thesis on deep learning for semantic image search, focusing on applying CNNs to image retrieval problems.
Availability
Location
Authorized to work in
Job categories
Skills
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