Davor Hafnar

GCP Data Engineer
AI/ML Solutions Architect

Business-minded
Data & AI solutions

Blending technical expertise with a business foundation, I specialize in end-to-end data and AI/ML solutions using Python, Java, and Google Cloud technologies.

My work focuses on providing state-of-the-art, yet technically as simple as possible, solutions that keep both users' and business needs in mind.

I am based in Ljubljana, Slovenia (EU).

2021 - PRESENT

Better
Built multiple internal AI-based tools and coordinated a production LLM-based feature.

2018 - 2021

Bragg
Helped lead the introduction of Google BigQuery and advanced analytics solutions.

2020 - PRESENT

CS PhD Candidate
Researching practical LLM-based personalization framework.

2016 - 2018

Outfit7
Managed My Talking Tom and collaborated on A/B test designs.

Solution Example

In this solution prepared for a local Google Developers Groups meetup I walk you through the process of building an end-to-end Retrieval-Augmented Generation (RAG) system on top of BigQuery. This system allows internal users to ask questions and receive answers from your data in plain language.

Key skills, experience and approaches

Product-centric approach

With years of product management experience, an MBA (General), and familiarity with Scrum, I approach each feature top-down, considering multiple angles, from user to business impact.

Leveraging Google Cloud serverless solutions

As the stacks have become complex and dynamic, solutions can be approached from multiple angles. Cloud providers like Google offer native solutions, which can massively reduce overhead when dealing with data and machine learning.

From idea to the coded proof of concept

I believe in an end-to-end approach to features, visualizing them from user need to how complex the development and maintenance will be. Success can usually be determined only after shipping, and time to users matters.

Learning to stay ahead of the curve

I agree with Arthur C. Clarke that "any sufficiently advanced technology is indistinguishable from magic." That's why I am fascinated with technology and invest a lot in staying with the state of the art in the field.

Some selected projects, talks and certifications

[Certification] Exam validates a developer's foundational knowledge of integrating machine learning into tools and applications.
View credential

[Presentation] Presented the learnings and developed GenAI features for Better Meds at an event in Westminster, London.

[Presentation] Presented on Serverless "RAG with BigQuery and Gemini" at Google Developer Group, Ljubljana.

[Certification] The exam evaluates skills in architecting, collaborating, scaling, serving, automating, and monitoring ML solutions.
View credential

[Project] A publicly acessible utility that helps format emails in Slovene language using OpenAI's moderation API and GPT-4o.

[Paper] A paper describing a validated framework for a mobile game where the content is adjusted to the player using LLMs.
View on IEEE Xplore

[Certification] Oracle C.A., Java SE 8 Programmer exam tests knowledge of object-oriented concepts and Java programming language.
View credential

Some tools I work with

Google Sites

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