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Understand how systems work, by playing with them

Short lessons on system design, technology and AI. Move a slider, break something, see why, then leave with code that runs and a brief you can hand to an AI.

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Series

Series · 6 lessons

Processing data: batch and stream

From what the two approaches are, through windows and tools, to a working pipeline you can run for a few dollars.

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  1. Batch vs stream processing, explained with a simulationBatch collects data and processes it at once, stream handles it as it arrives. Run a live simulation to see what each costs, with a comparison table.4 min · Beginner
  2. Batch or stream: which one fits your problem?Pick a real problem to see whether batch, stream or both fits it, and why. With a quick rule for choosing and the Lambda and Kappa architectures.2 min · Beginner
  3. Stream windows, event time and late data, explainedAn endless flow cannot be summed once. Watch fixed, sliding and session windows in a live demo, then learn event time, watermarks and how to avoid duplicates.3 min · Intermediate
  4. Data processing tools: what to choose by language and cloudWhat Spark, Flink, Kafka, Airflow and the services on Cloudflare, AWS, Google Cloud and Azure do. Choose in three layers: industry standard, cloud, language.4 min · Intermediate
  5. Build a cheap data pipeline with TypeScript on Cloudflare or AWSTake orders, process small batches and total them nightly in one Worker. With a price table by tier, an AWS version and a prompt to hand the job to an AI.7 min · Intermediate
  6. Build batch pipelines with Spark and stream with Kafka, FlinkThe steps to build a batch pipeline with PySpark and Airflow and a stream pipeline with Kafka and Flink SQL, with samples, safe re-runs and what to learn next.4 min · Intermediate

Single lessons

What every lesson gives you

  • Something to try

    A live demo where it helps, so you see the idea move instead of reading about it.

  • When to use it

    Real situations, the choice each one calls for, and why.

  • Steps that run

    Working code and commands, with the versions and the date they were checked.

  • A way to check

    A short quiz that explains each answer, and sources you can read yourself.