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Jonathan Hazeley

Projects

Each of these is a case study in what was at risk, and what changed once it was fixed.

Entertainment, client name withheld2026

Proving a Migration, Not Just Doing One

Migrated a player-cohort analytics platform off Snowflake onto a Databricks medallion architecture, and built the config-driven framework that proved every migrated table matched its source: 678M rows, 114 automated checks per run.

  • Databricks
  • Lakeflow Declarative Pipelines
  • Lakehouse Federation
  • Snowflake
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Personal project2025–2026

The Databricks Catalog Other Engineers Build Inside

A ~90-skill Databricks engineering catalog, served live to AI coding agents over MCP, with a usage-telemetry loop that decides what gets written next.

  • Databricks
  • Python
  • FastMCP
  • Google Cloud Run
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NC Department of Information Technology2025

Statewide Transportation Data, Made Trustworthy

Real-time Delta Live Table ingestion that improved statewide safety reporting availability 30%, plus the metadata automation and glossary that made new sources fast to onboard and the numbers safe to publish.

  • Databricks
  • Delta Live Tables
  • PySpark
  • Azure OpenAI
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Healthcare, client name withheld2025–2026

Hospital Billing, Modeled Once

Led a cross-functional team through a hospital billing engagement, refactoring 100+ fact and dimension tables, data marts, and Power BI semantic models sourced from Epic Clarity and Caboodle.

  • Databricks
  • SQL
  • Power BI
  • Epic Clarity / Caboodle
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Snap One (acquired by ADI Global)2021–2025

The Metrics Behind a 50% EBITA Increase

Built the Databricks pipelines and the governance around them that took IoT and SaaS telemetry all the way to board-level decisions, contributing to a 50% EBITA increase and a multi-million-dollar ARR win.

  • Databricks
  • SQL
  • Python
  • Power BI
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Personal project2025–2026

Architecture Enforced by Gates, Not Convention

A multi-tenant referral platform whose architecture boundaries are enforced by AST gates in CI, with capability-based spend control and a tenancy isolation proof that runs as a test.

  • Python
  • PostgreSQL
  • Databricks
  • AST analysis
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Personal project2025–2026

Proving Agent Skills Actually Work

A meta-toolkit for building agent skills and proving they work: 24 meta-skills, ten executable workflows, and a pass^k ≥ 0.95 graduation bar, shipped as a zero-dependency MCP server.

  • Python
  • Model Context Protocol
  • OAuth 2.1
  • uv workspace
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