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Codez Up
Programming tutorials and engineering deep dives across Java, JavaScript, Python,
- Authority
- 46 reach 5 · trust 5 · quality 21 · freshness 15
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- listed
- llms.txt
- https://codezup.com/llms.txt
- Sections
- 26
- Links
- 249
- Size
- 41445 bytes
- Popularity rank
- #936035
- Country
- United States Hosting inference
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- United States Hosting inference
- Country evidence
- No published address evidence collected yet
- For agents
- Documentation: developer or product docs worth reading, nothing to call
- First seen
- 2026-10-25T18:10:30.576Z
- Last checked
- 2026-10-26T09:07:38.260Z
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Their llms.txt
The beginning of the file, from our validated copy saved 2026-10-26T09:07:30.982Z. Cached copy · Source on codezup.com
# Codez Up
> Programming tutorials and engineering deep dives across Java, JavaScript, Python,
> Node.js, Angular, React, Rust, Go, mobile and system design. 1,800+ guides built
> up by four contributors and now maintained by a single developer; older posts are
> re-researched and rewritten rather than left to go stale, and every rewritten post
> shows its updated date.
## Start here
- [Python Tutorial Series](https://codezup.com/latest-python-tutorial-series-and-examples/): 46 curated Python tutorials, from basics through multiprocessing.
- [Node.js Tutorial Series](https://codezup.com/node-js-tutorial-series-examples/): Node fundamentals through JWT auth, streams and WebRTC.
- [MEAN Stack Tutorial Series](https://codezup.com/mean-stack-tutorials-series-and-examples/): MongoDB, Express, Angular and Node as one stack.
- [About Codez Up](https://codezup.com/about-us/): Who writes this site, how tutorials are maintained and rewritten.
## Engineering deep dives (2026 series)
Daily long-form breakdowns of how production systems actually work, each citing
primary sources - papers, engineering blogs and official docs. This is the strongest
material on the site.
- [Left the WiFi. Why Didn't Your Call Drop?](https://codezup.com/quic-connection-migration-network-switch/): QUIC connection migration keeps a connection alive when your IP changes from WiFi to cellular, with no new handshake. See how the connection ID does it.
- [DynamoDB Has Spare Capacity. Still Throttling?](https://codezup.com/dynamodb-hot-partition-throttling/): A DynamoDB hot partition throttles one key even when the table has spare capacity. Here's the per-partition limit and how split-for-heat fixes it.
- [How Spotify Starts a Song in 265ms](https://codezup.com/how-spotify-starts-a-song-in-265ms/): Spotify streaming architecture starts a song in about 265 ms by playing the first 15 seconds from a server while the rest streams. Here's how.
- [How Discord Sends One Message to a Million Users](https://codezup.com/how-discord-fans-out-a-message-to-a-million-users/): How Discord message fanout reaches a million live users from one process using passive sessions, relay processes, and Manifold batching.
- [How Prometheus Stores a Point in One Bit](https://codezup.com/prometheus-time-series-compression/): Time series compression is why Prometheus stores a sample in about 1.37 bytes. Here's the delta-of-delta and XOR trick from Facebook's Gorilla paper.
- [How Netflix Survives Losing a Whole AWS Region](https://codezup.com/how-netflix-survives-losing-an-aws-region/): Multi-region active-active lets Netflix evacuate a failed AWS region in about 7 minutes. Here is how replication, DNS steering, and hot-standby capacity…
- [How VS Code Edits a 35MB File Instantly](https://codezup.com/how-vs-code-edits-huge-files-piece-table/): Old VS Code allocated 600 MB opening a 35 MB file and crashed. The piece table stores text as immutable buffers plus pointers, so edits never move data.
- [How Facebook
…Machine-readable: GET /v1/resolve?q=codezup.com · GET /v1/domain/codezup.com · this page as Accept: application/json or text/markdown · MCP lookup_domain
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