You Can Practice High-Traffic Engineering Without Real Traffic
Build and operate a small service, create load deliberately, and show how you found and fixed bottlenecks without pretending a load test equals production experience.
Engineer · Writer
Build it. Run it.
Learn from it.
I’m Gemini Kim. I define software problems, test simple solutions, and write about what real-world operation teaches me.
Latest articles
Recent articles
Reliable Database Tests Without a Shared Test Database
Choose mocks, an in-memory database, Testcontainers, or a real database by the failure you need to catch, while keeping ordinary tests isolated from shared infrastructure.
Do Not Create a DTO for Every Layer by Habit
Use DTOs where data crosses a boundary with a different contract. Mapping has a cost, but so does letting external request shapes define the inside of a service.
Git History Is a Team Asset, Not a Work Diary
Split work before polishing commits, shape pull requests for reviewers, and leave a history that helps the next engineer understand changes and recover a release.
Put Circuit Breakers Next to the Failing I/O
Circuit breakers, timeouts, cache fallbacks, and remote-call policies belong near the implementation that performs the I/O, while domain code chooses the required behavior.