Welcome!

I'm Daniel Mermelstein, currently Director of Data at Sylva.

About Me

My career has been a journey through various parts of the data spectrum:

History degree → 10-person startup → go-to (AKA only) business intelligence analyst at a global non-profit → data analyst (adtech) → data analyst / data scientist (fintech) → data engineer → data team leader.

Fun Side Projects: (See All Projects »)

Over the years my project work has grown across a few areas. Below are some highlights I've published or am able to discuss publicly. My professional experience also includes designing and implementing systems for Retrieval Augmented Generation (RAG) with PostgreSQL and pgvector, A/B testing platforms, data enrichment pipelines (e.g., from LinkedIn), and comprehensive automated reporting solutions for finance, accounting, and general business intelligence.

Data Engineering & Orchestration Open-source dbt runner using GitHub Actions: Simple dbt Runner R package for easy database querying (Snowflake, Redshift, Postgres): Snowquery R & Python in one Docker Container: docker-python-and-r DuckDB Simultaneous Connection Benchmark: duckdb_connection_benchmark

Web Applications & Data Visualization Searchable database of all the 3K programs in NYC: NYC3K.com Automated surf forecasts for the Hudson River: Downwinder Sportsbetting data and NBA game predictions: BloomBet Terminal Personalized rowing workouts: Row Hard AI, Language & Development Tools VSCode plugin for a custom LLM chat tool: e/acc Copilot Haggadah Translation (English to Mandarin): haggadah-translation

Beyond my professional life, I'm an avid extracurricular athlete and made it to the final round of selection for Team USA in 2015. I am a 5x Bronze medalist at the Dragon Boat World Championships.