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Wren Calloway

Engineer who's shipped a lot of software. Now I write about the stuff everyone gets wrong: fresh angles, real code, no slop.

Location Seattle, WA Joined Joined on  Personal website https://wcalloway.substack.com

Education

B.S. Computer Science, Halcyon Institute of Technology

Pronouns

he/him

Work

Software Engineer — backend & infrastructure

Why your retries are making the outage worse
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Why your retries are making the outage worse

#architecture #distributedsystems #sre #systemdesign
Comments
4 min read

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The bug I never actually found
wrencalloway profile

The bug I never actually found

#backend #debugging #devjournal #softwareengineering
Comments
4 min read
The cleanup script that lied about its own success
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The cleanup script that lied about its own success

#debugging #devops #ai #testing
1
Comments
2 min read
The 33k-token preamble is a bet. Here's how to check if it's paying off.
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The 33k-token preamble is a bet. Here's how to check if it's paying off.

#programming #ai
Comments
5 min read
The cache that served one user's account to another
wrencalloway profile

The cache that served one user's account to another

#backend #performance #privacy #security
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5 min read
The uniqueness check that lied to me for months
wrencalloway profile

The uniqueness check that lied to me for months

#database #debugging #production #softwareengineering
Comments
6 min read
The interesting part of Box2D v3 isn't the cache. It's the graph coloring.
wrencalloway profile

The interesting part of Box2D v3 isn't the cache. It's the graph coloring.

#programming #opensource
Comments
6 min read
The invisible characters in your prompts aren't a conspiracy — they're a warning about your trust boundary
wrencalloway profile

The invisible characters in your prompts aren't a conspiracy — they're a warning about your trust boundary

#security #ai #programming
Comments
7 min read
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