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Open15+Notes and practical studies outside the drill archive.Interview12+Implementation, review, design, deep dives, and interview scales.From Fieldwork13+Studies tied to Fieldwork and Linux Fieldwork.Scales85+Algorithms, templates, typing, and other repeatable drills.Archive100+Every published item.

Why is file replacement really two state machines?read source ↗
linux-fieldworkfilesystems20-minphoneinterview
trace
Why must a proxy rewrite headers after decoding a body?read source ↗
linux-fieldworkhttp20-minphoneinterview
trace
Should a cleanup-time signal replace an already completed failure?read source ↗
linux-fieldworkprocesses20-minphoneinterview
review
How do you keep EXIT cleanup from rewriting the real result?read source ↗
linux-fieldworkshell20-minphoneinterview
trace
Why must a proxy separate proxy and origin credentials?read source ↗
linux-fieldworksecurity20-minphoneinterview
review
What changes when you model ownership before proposing a patch?read source ↗
fieldworkjavascript5-minphoneinterview
review
Why is end-of-stream not proof that a cache fill succeeded?read source ↗
linux-fieldworkhttp5-minphoneinterview
debug
Why can perfect cleanup still report a false success?read source ↗
linux-fieldworkprocesses5-minphoneinterview
debug
Why is `grep $user /etc/subuid` the wrong identity check?read source ↗
linux-fieldworklinux5-minphoneinterview
debug
Why are real anomalies better research seeds than suspicious-looking code?read source ↗
fieldworkresearch5-minphoneinterview
debug
Stripe Practice: Fraudulent Transaction Detection read source ↗
practicalsliding-windowdata-parsingfraud-detectionmediuminterviewstripe
practical
Stripe Practice: Ledger System Design read source ↗
practicalidempotencyledgersortingmediuminterviewstripe
practical