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Answer a few short technical questions about what you've built and how you solve problems. We read every application, so specific answers about your own work matter more than polished ones.
Include a repository or demo link. Tell us what it did, what you personally built, and how you measured whether its output was correct, with numbers if you have them.
Explain how you'd prevent duplicate processing and keep messages in the right sequence.
How did you catch it, what did you change, and how did you check whether the fix worked?