Bartosz Mikulski
Principal AI Engineer & Architect
I help teams build boring, reliable infrastructure for exciting AI problems.
Status Update: I am currently transitioning back to full-time engineering leadership.
Actively looking for Principal / Staff AI Engineer roles (Remote or Hybrid (EU)).
Principal AI Engineer & MLOps Architect
I bridge the gap between "it works in a notebook" and "it works for 200 million users."
Specializing in Reliable RAG, Data Platforms at Scale, and Infrastructure Modernization.
Ex-Qwak, Fandom, HolidayCheck. O'Reilly Contributor. Trained 1,000+ Engineers.
Engineering Strategy & Deep Dives
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Architecture Pattern: Measuring and Fixing AI Hallucinations
A strategic framework for recognizing hallucination types and selecting the correct mitigation strategy at the architectural level.
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The AI Architect's Guide to RAG Debugging
A 3-step diagnostic process to isolate root causes in complex retrieval systems, focusing on data hygiene over model prompting.
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Quantifying Retrieval Quality (MRR & NDCG)
If you can't measure it, you can't improve it. A technical guide on implementing search metrics to validate RAG performance.
Industry Recognition & Talks
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DataTalks Club by Alexey Grigorev
Episode: Data Intensive AI (February 2025)
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97 Things Every Data Engineer Should Know by Tobias Macey
Contributor: The Six Words That Will Destroy Your Career
Peer & Client Recommendations
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Martyna Urbanek-Trzeciak
(Product Manager - Data Engineering)
I worked with Bartosz while he was a member of Data Engineering team at Fandom. He is very professional and open to share his knowledge with his teammates and beyond. His approach was always very data-driven and he has great knowledge in Data Engineering area what made him very valuable partner in discussions.
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Mariusz Kuriata
(Senior Manager of Engineering - Head of Ops)
It was my pleasure to work with Bartosz. Bartosz is a dedicated and experienced Data Engineer who showed a range of skills and readiness to help. I appreciated that I could count on Bartosz to lead sophisticated technical projects. Highly recommend!
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Workshop participant
I'm extremely impressed with Bartosz's expertise and experience. We covered all assignments, addressing various details, scenarios, and potential errors. Every question we asked was answered thoroughly. The workshop format of the sessions and small group activities were particularly enjoyable. We had opportunities to apply our new knowledge practically. The trainer remained accessible whenever questions arose. If any uncertainties emerged, the facilitator explained everything with patience."