Patrick F. Callahan

Data Engineer

Building robust data pipelines and analytics infrastructure. Transforming raw data into actionable insights.

About Me

I'm a Data Engineer with expertise in designing and implementing scalable data infrastructure. I specialize in building ETL/ELT pipelines, data warehousing solutions, and analytics platforms that enable data-driven decision making.

My work spans the entire data lifecycle—from ingestion and transformation to modeling and visualization. I'm passionate about clean architecture, maintainable code, and turning complex data challenges into elegant solutions.

Experience

Senior Data Engineer

Company Name

2023 - Present

  • Designed and maintained data pipelines processing millions of records daily
  • Implemented dbt models for data transformation and analytics
  • Built real-time streaming solutions using modern data stack
  • Reduced pipeline runtime by 60% through optimization

Data Engineer

Previous Company

2021 - 2023

  • Developed ETL workflows for data warehouse migration
  • Created automated data quality monitoring systems
  • Collaborated with analytics team to build self-service BI tools

Technical Skills

Languages

Python SQL Bash JavaScript

Data Warehouses

Snowflake BigQuery Redshift PostgreSQL

Tools & Frameworks

dbt Airflow Spark Kafka Fivetran

Cloud & DevOps

AWS GCP Docker Terraform Git

Projects

Data Pipeline Template

Production-ready template for building data pipelines with dbt, Airflow, and modern data stack best practices.

dbt Airflow Docker

Data Quality Framework

Automated data quality monitoring and alerting system for catching issues before they impact downstream consumers.

Python Great Expectations Slack API

Get In Touch

I'm always interested in discussing data engineering challenges, new opportunities, or just connecting with fellow data professionals.