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Articles

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Developer Tools

Flag service unreachable: what should security flags default to?

When the flag provider is down, SDKs use default values. Choose them on purpose: safe defaults for security flags, cached values, and how to test it.

Oct 18, 20263 min read
Developer Tools

Feature flags are not authorization: hiding a button is not a control

A permissioning flag decides who sees a feature, but the server must still enforce who can use it. Where to put flag checks and where to put access checks.

Oct 18, 20264 min read
Developer Tools

Feature flag evaluation context: what to send and what to keep out

The evaluation context decides who sees a feature. Send a stable ID and a few coarse attributes, and keep emails, tokens and personal data out of it.

Oct 18, 20263 min read
Developer Tools

Fake credentials in test fixtures without scanner noise

How to keep tests that need keys and tokens from tripping secret scanners or leaking real ones: obvious fakes, generated values and allowlists.

Oct 18, 20263 min read
Developer Tools

How do you fail builds only on new SAST findings in legacy code?

Record a baseline run, compare each new scan to it, and fail only on findings not in the baseline. The count can then only go down. Here is the setup.

Oct 18, 20264 min read
Developer Tools

Extend or customize the Airflow Docker image: which is safer to maintain?

Extending versus customizing the Airflow image, seen through patching and pinning: constraints, same-version installs, non-root pip, and regular rebuilds.

Oct 18, 20263 min read
Developer Tools

Showing flag state to operators without showing it to the public

Operators need to see which flags are on in each environment, but a public endpoint leaks unreleased features. How to build a flag status view safely.

Oct 18, 20263 min read
Developer Tools

Expo over the air updates and code signing, explained

Over the air updates push new JavaScript to installed apps. Code signing lets the app reject tampered updates. How the keys work and how to rotate them.

Oct 18, 20263 min read
Developer Tools

How do I exclude a vulnerable transitive dependency in Maven?

Two ways to deal with a vulnerable transitive library in Maven: exclusions to remove it, or dependencyManagement to pin a fixed version. When to use each.

Oct 18, 20263 min read

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