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Mateusz Opala

@mateuszopala

Staff Machine Learning Engineer specializing in production-grade LLM, retrieval, and agentic AI systems.

Poland
Message

What I'm looking for

I seek impactful ML roles where I can design and ship production-grade LLM and retrieval systems, mentor teams, and drive measurable product and business outcomes.

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

Clari logoCL
Current

Staff Machine Learning Engineer

May 2024 - Present (1 year 9 months)

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.

SH

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.

Brainly logoBR

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%.

Netguru logoNE

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.

CR

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.

Education

Degrees, certifications, and relevant coursework

AGH University of Science and Technology logoAT

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.

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Mateusz Opala - Staff Machine Learning Engineer - Clari | Himalayas