#switch#ai#dataengineering#tutorial
Switch from zero: ship a human-in-the-loop data quality agent to your team chat
I spent the Flip the Switch hackathon building Shield, an agent that checks a daily table, explains...
Jennifer Evangelista8 min read
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Jennifer Evangelista
Data Architecture & Data Engineering Specialist | Databricks Certified Data Engineer Professional | AWS & Google Cloud certified. Harvard CS50 certificates: AI with Python & Databases with SQL.
Articles by @jenniferevangelistade
Browse the latest writing surfaced through DevArt.
Jennifer Evangelista8 min read
#mlhacks#devchallenge#hackathon#ai
This kid-safety guard won a Hacktoberfest prize, and it runs on a laptop GPU
This is a submission for the MLH x DEV Writing Challenge 🏆 Night Guard is a prize winner: Best Use...
Jennifer Evangelista16 min read
#devchallenge#hf26challenge#ai#opensource
Witching Hour: What If Someone Tried to Warn You? An Open-Model Ghost Hunt Where TabPFN and Gemma Investigate Your Real Data: Ghost or Fiction?
Have you ever felt watched? Coat on. Keys in hand. You are about to go out, but something feels...
Jennifer Evangelista20 min read
#devchallenge#hf26challenge#ai#opensource
Night Guard: an open-model guard that watches out for kids in game chats, so tired parents don't have to read every message
This is a submission for the Hacktoberfest 2026 Week 3 Challenge: Slow and Steady. Looking for the...
Jennifer Evangelista16 min read
#python#databricks#dataengineering#dataquality
Your pipeline ran green ✅ and shipped last week’s data anyway
Image generated with AI Inspired by the “Is this a pigeon?” meme. The dates and scenario are...
Jennifer Evangelista4 min read
#apacheairflow#dataengineering
A Freshness Check Before the 8 a.m. Report
Check the output interval and event timestamps before the report becomes available to consumers. The...
Jennifer Evangelista5 min read
#sql#dataengineering#databricks
Three Orders In, Three Rows Out, 42.9% More Revenue
An INNER JOIN can lose orders and multiply others in the same query. Here is a reproducible test for...
Jennifer Evangelista5 min read
#databricks
Unity Catalog Row Filters and Column Masks: A Fail-Closed Security Design You Can Test
Original AI-generated illustration: column masking does not grant row access. A data-governance...
Jennifer Evangelista8 min read
#kafka
Your Kafka Consumer Lag Is Not Your SLA: Offset Math, Retention, and the Missing-Commit Trap
Original AI-generated illustration: a zero-lag dashboard can hide a missing committed offset. A...
Jennifer Evangelista7 min read
#aws#dataengineering#databricks#apachespark
Your S3 Pipeline Needs a Replay Plan, Not More Optimism
How file checkpoints, event identity, and source versions work together in a Databricks ingestion...
Jennifer Evangelista7 min read
#apachespark#databricks#dataengineering#pyspark
Your Delta MERGE Is Not a Mind Reader
A practical PySpark contract for duplicate events, conflicting versions, and deterministic...
Jennifer Evangelista6 min readAdvertisement