Adam Hajari - Machine Learning Engineer at Block

Adam Hajari

Machine Learning Engineer at Block

Seattle, Washington, United States

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Summary

👤

Senior

🎓

Top School

Adam Hajari is a Staff Machine Learning Engineer with over a decade of experience building production ML systems that materially reduce fraud and operational risk. At Block he owned the Account Takeover domain, leading cross-functional incident responses and preventing over $20M in annual losses while keeping millions of Cash App users safe and the product experience seamless. He designs ML infrastructure and “force-multiplier” tooling—feature selection, signal generation, and training pipelines—that accelerate time-to-market across teams and drove measurable Snowflake/GCP cost optimizations. With a PhD in Physics and a background in simulation-heavy research, he brings a strong quantitative instinct and systems thinking to ambiguous, high-stakes problems. He also contributes full‑stack Python tooling (authoring work on the spyre web framework), blending hands-on engineering with strategic domain ownership.

11 years of coding experience

16 years of employment as a software developer

PhD, Physics, PhD, Physics at Washington University in St. Louis

BS, Physics, BS, Physics at Auburn University

Stackoverflow

Stats

91reputation

4kreached

1answer

0questions

Github Skills (14)

data-visualizations10

web-framework10

data-visualization10

data-visualisation10

cherrypy10

python10

jinja210

webapp10

web-application10

matplotlib9

pandas9

html8

css7

jupyter-notebook6

Programming languages (1)

Python

Github contributions (3)

adamhajari/spyre

Jul 2014 - Jul 2015

a web application framework for python

Role in this project:

Full-stack Developer

Contributions:86 commits in 11 months

Contributions summary:Adam primarily worked on the `spyre` web application framework for python, as shown in the code diffs in `example.py`, `server.py`, `setup.py`, and `model.py` files. The commits added and modified build files, updated the `example.py` file and the `server.py`, which were for a web app framework for python. They included modifications to the `setup.py` file to define package dependencies and included changes to include download functionality.

pythonweb-applicationframeworkweb-application-frameworkapplication-framework

adamhajari/Introduction-to-Data-Science

Jun 2015 - Jun 2015

Contributions:14 commits in 15 days

pythonsciencedata-sciencemachine-learningintroduction-to-data-science

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