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Daniel FreymannDF
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Daniel Freymann

@danielfreymann

Data Visualization Engineer at Graphicacy, serving 50K+ daily requests with a data layer that made dashboards load 5x faster.

United States
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At Graphicacy, I architected a hybrid data layer combining cached JSON and live GraphQL that serves 50K+ daily requests and improved dashboard load times 5x. I also build responsive data interfaces that make complex datasets legible to non-technical audiences.

I partnered with client stakeholders to turn research and reporting needs into shipped data products. I also spearheaded a CI-triggered documentation pipeline using GitHub Actions and the Anthropic API to keep project documentation current.

At Grassroots Analytics, I built real-time ML prediction infrastructure and extended a large codebase with Go and Python microservices. The data systems handled 10M+ records at 30% lower latency.

At Equator Capital, I developed REST APIs and a React/TypeScript frontend, and built an LLM-powered ingestion pipeline for the USS Sequoia research team. In personal projects, I built a corporate ownership graph covering 65K companies, 38K brands, and 77K products, as well as an algorithmic trading system for prediction markets.

Experience

Work history, roles, and key accomplishments

GA

Backend Developer

Grassroots Analytics

Jun 2025 - Nov 2025 (5 months)

Built ML prediction infrastructure with CatBoost and LightGBM served via SageMaker endpoints, achieving 87% accuracy on an NLP classification task. Extended a large codebase with Go/Python microservices on Flink, PySpark, and BigQuery, handling 10M+ records at 30% lower latency.

EC

Full-Stack Developer

Equator Capital

Jun 2024 - May 2025 (11 months)

Developed REST APIs with FastAPI and PostgreSQL on AWS RDS, and a React/TypeScript frontend for timeline-based exploration. Built an LLM-powered ingestion pipeline with Gemini API, LangChain, and RAG, structuring 483 archival records into a normalized schema.

Amazon logoAM

SDE Intern

Jun 2023 - Sep 2023 (3 months)

Designed a Java API and data models for $50M+ in contract transactions, using DynamoDB TransactWriteItems for atomic writes.

Education

Degrees, certifications, and relevant coursework

University of Chicago logoUC

University of Chicago

Bachelor of Science, Computational and Applied Mathematics

B.S. in Computational and Applied Mathematics, completed in June 2024.

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