Joey Lopez

Sr. Data Engineer · Milwaukee, WI

Experience

Sr. Data Engineer

Accenture · Financial Services
Aug 2021 – present · ~4.5 years

Data engineering across banking and payments. API integrations between acquired institutions' lending systems, historical data migrations (10,000+ datasets via Airflow + config-as-code), Kafka streaming platform modernization, Databricks ETL. Built agentic POC with LangGraph for API marketplace onboarding. Led infrastructure migration efforts — took dataset velocity from 1-10 to 20-25 per release across 250 datasets with zero consumer disruption.

Data Analyst

Bates White · S&P Global Mobility
2020 – 2021

Analytics and data visualization in economic consulting and automotive data.

Education & Certs

UC Irvine — B.S. Computer Science, 2020
GCP Associate Cloud Engineer · AWS Cloud Practitioner

Skills

Java/SpringPythonGoScala/SparkSQL KafkaAWSGCPDockerAirflow DatabricksSnowflakePySpark Claude CodeLangGraphMCP Servers

Writing

Algebraic and Computational Limits of LLM Guardrails

2026 · preprint

Wondered why "read every other character" jailbreaks work. Proved it's algebraic — regex guardrails sit in AC⁰ which can't compute modular counting. First paper.