Hands-on, animated learning labs for data engineers and supply-chain planners — pure static sites, no framework, no backend. Pick a lab to start.
Airflow internals — architecture, DAG parsing, scheduler, executors, task lifecycle, failure scenarios, and interview prep.
Open the Airflow lab →From git push to production data — Git, GitHub Actions, Terraform, Docker, Databricks, dbt, Kubernetes, taught through the RetailFlow story.
The o9 Distribution Planning Solver (CATMPN) — DRP, inputs, constraints, net-requirement logic, shortage & allocation, taught through the CAT Aftermarket Parts Network and Widget-A.
Open the o9 Solver lab →A master interview question bank — 45 topic groups spanning forecasting, S&OP, MRP/DRP, inventory, o9, SSIS and SQL. Every question with a plain-English answer and a business-case example.
Open the interview Q&A →One tool for the whole interview stack — Python, SQL, PySpark, NumPy & Pandas, each with a Learn concept curriculum and a Practice problem set (500+ problems). Runnable Python/NumPy/Pandas in the browser, worked SQL & PySpark solutions, plain-English logic, spaced-repetition review, and a cross-stack readiness dashboard. Plus a ⌘K command palette with guided study paths and a Rosetta panel showing the same task in every dialect. Includes the former standalone SQL Server and PySpark labs — your old progress carries over automatically.
Open the Coding Stack →The Spotify Azure Data Engineering project — an interactive architecture visualizer, implementation lab, production-debugging simulator and senior-interview coach. Every component explained across 9 layers (simple → technical → internals → implementation → why → trade-offs → failure → interview), grounded in the project handbook. Complete Architecture mode live; more modes rolling out.
Open the Spotify DE lab →A block-based résumé builder — fill in every block (header, summary, skills, experience, projects, education, awards, or custom sections), edit section headings and items, and watch a live A4 preview. Download a print-quality, text-selectable PDF. Pure static site; your data stays in your browser.
Open the Resume Builder →