#casestudy
7 essays on case study from the people writing in Remote Since Forever.
- Essays
- 7
- Contributors
- 4
- First filed
- Apr 2025
- Latest
- Aug 2026
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backend
Upgrading TypeORM 0.3 to 1.0 in Production: A NestJS Case Study
How we took TypeORM 0.3 → 1.0 to a live NestJS API without a headache.
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aws
How a CloudFront Custom Error Page Leaked JWTs to S3: A Case Study
A pen-test curl found CloudFront forwarding `Authorization` headers to the S3 error-page bucket, where S3 reflected every JWT back in its XML error response. Two lines of Terraform closed it across sixteen distributions.
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email
Implementing a Zero Auth Unsubscribe Link on Your Email
Nobody logs in to unsubscribe. They mark you as spam instead. Here's the small trick we used — a signed token in the URL — so users can unsubscribe with one tap without ever seeing a login screen.
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backend
Splitting a Mega-Service Into Four: The Service-Facade Refactor (Plus a Reusable Skill)
How we split a 1,307-line `user.service.ts` into four responsibility-tagged NestJS sub-services (query, mutation, membership, stats) behind a stable facade — no caller broke, no test changed, one PR, and a reusable Claude skill file at the end.
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jwt
How a JWT Audience Map Saved a CORS Mistake: A Defense-in-Depth Case Study
On a client's API, a CORS wildcard looked like a HIGH severity finding — until we tried to actually exploit it. A second, independent JWT audience check turned a trivially exploitable bug into one that required a much harder prerequisite.
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react native
Asking For Notification Permission: The Second Time Is the Wrong Time
iOS gives you exactly one shot at the native permission prompt. Here's the simple screen we show first, so users see what they'll get before the OS asks the question.
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application development
An Event-Driven Architecture Case Study: Lessons from a Real-World Application
A decade of Clearview engineering for a confidential awards group, and the event-driven AWS architecture that keeps it observable.
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