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How we build K3X: sync, data model and the systems behind them.
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Engineering
Guides
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Sep 10, 2026
Two-way inbox sync sounds simple until you meet forwarded threads, shared mailboxes and rate limits. Here is how K3X keeps every email on the right record, once.
Jul 15, 2026
Why custom objects in K3X are first-class, how schemas change without downtime, and how relationships stay in sync from both sides.