Why Integrations Fail After Go-Live
Most integrations do not fail on launch day. They fail three months later, and almost always for the same handful of reasons.
Integrations rarely fail at launch. Launch is when everyone is watching, the data is clean, and someone is available to fix it within the hour. They fail in month three, quietly, and are discovered by someone downstream asking why a number looks wrong.
The failures that actually happen
Nobody owns the failure case
The happy path gets designed carefully. What happens when the other system is down for twenty minutes usually does not. Records vanish, or duplicate, or sit in a queue nobody monitors. The first real question to ask about an integration is not how it works but what it does when the other end does not answer.
Silent partial success
Worse than an outage. Ninety-eight records sync and two do not, nothing errors, and the gap surfaces weeks later in a report. Any integration moving data on a schedule needs a reconciliation check — a count on both sides, compared, with someone told when they diverge.
A schema changed and nobody said
The other system adds a required field, or tightens a validation, or starts returning a value your parser did not expect. This is normal and will keep happening. The design question is whether an unexpected shape stops the run loudly or gets swallowed.
It was built for the data as it was that week
Test data is clean because someone made it. Real data has records from 2019 with a null where the code assumes a value. Build against a copy of production, not a fixture.
Credentials expire
An API key rotates, an OAuth grant is revoked when someone offboards, a certificate expires. The integration was tied to a person's account rather than a service account, and it dies when they leave.
What makes the difference
Not sophistication. The integrations that survive tend to share four unglamorous properties: they are idempotent, so re-running is safe; they log enough to reconstruct what happened; they fail loudly rather than partially; and someone is named as responsible for the alert when they do.
None of that is visible in a demo. All of it is what you are paying for.
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