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The Speedcraft Lab

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The Speedcraft Lab

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Sep 24

Shopify Left React Native Because Agents Rewrote the Cost Sheet

The Shop app went fully native in 12 weeks. The real lesson is about decisions with expiry dates.

Shopify Left React Native Because Agents Rewrote the Cost Sheet

The Speedcraft Lab

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13h ago

Netflix Runs 30,000 Flink Jobs, and Open-Source Autoscaling Saved One of Its Teams $1.1M a Year

That team cut Flink compute 58%, and Netflix runs the scaler at 0.45 utilisation, not 0.7

Netflix Runs 30,000 Flink Jobs, and Open-Source Autoscaling Saved One of Its Teams $1.1M a Year

The Speedcraft Lab

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2d ago

Netflix’s System Design Interview Was Dirty. I Wasn’t Ready.

Midway through my answer, they killed an entire AWS region and watched.

Netflix’s System Design Interview Was Dirty. I Wasn’t Ready.

The Speedcraft Lab

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5d ago

GitHub Used Copilot to Port Copilot’s Runtime to Rust: 832,000 Lines in 14.5 Weeks

A cold Copilot turn fell from 5.25 s to 1.33 s out of process and 292 ms in-process.

GitHub Used Copilot to Port Copilot’s Runtime to Rust: 832,000 Lines in 14.5 Weeks

The Speedcraft Lab

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Oct 28

GitHub’s Quietest Big Outage in August Ran 10 Hours 42 Minutes

The 17 August outage hit about 29K organisations. GitHub’s own figures say the Actions incident ran longer

GitHub’s Quietest Big Outage in August Ran 10 Hours 42 Minutes

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The Speedcraft Lab

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Oct 26

Meta’s System Design Interview Was a Brutal Reality Check

Six months of prep fell apart on one question about fan-out.

Meta’s System Design Interview Was a Brutal Reality Check

The Speedcraft Lab

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Oct 23

Cloudflare Moved cdnjs Off Google Cloud at 9 Billion Daily Requests and Hit Its Own Limits

Paid Workers went from 1,000 subrequests to 10,000 by default, and 10 million if you opt in

Cloudflare Moved cdnjs Off Google Cloud at 9 Billion Daily Requests and Hit Its Own Limits

The Speedcraft Lab

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Oct 21

Spotify Cut Claude Code’s File-Reading Tokens by 90% by Not Letting It Read Big Files

One engineer’s test: a 350-line hook sends big reads to Gemini Flash, at 10 to 30 seconds each

Spotify Cut Claude Code’s File-Reading Tokens by 90% by Not Letting It Read Big Files

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The Speedcraft Lab

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Oct 19

I Failed Google’s System Design Round Twice. Then I Cracked It.

Perfect diagrams got me rejected. One shift in how I talked got me hired.

I Failed Google’s System Design Round Twice. Then I Cracked It.

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The Speedcraft Lab

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Oct 18

Spotify Doubled Merged Code Changes to 17,000 a Month With AI. Verification Became the Bottleneck.

Quality work rose to 31% of merges, yet one dependency upgrade that passed every check still hurt users.

Spotify Doubled Merged Code Changes to 17,000 a Month With AI. Verification Became the Bottleneck.

The Speedcraft Lab

The Speedcraft Labhe/him

Friend of Medium

Senior engineer sharing FAANG interview post-mortems, big-tech system teardowns, backend deep-dives, and honest AI-agent experiments.

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