Almost anyone can make two systems exchange data once. The difference between an integration that lasts and one that becomes a monthly incident is what gets designed around it: how failures retry, how partial data is handled, what happens when the other side changes without warning, and whether anyone finds out before your customers do.
We build APIs and integrations with that lifespan in mind. Contracts are versioned so consumers aren't broken by improvements. Rate limits, authentication and pagination are decided at design time rather than discovered under load. Every outbound call assumes the other end will eventually be slow, unavailable or wrong, and behaves accordingly — idempotent writes, queued retries with backoff, dead-letter handling for the cases that need a human.
And because integrations live in the space between teams, we treat documentation and observability as deliverables. You get an OpenAPI or GraphQL schema a developer can work from without meetings, structured logs that show exactly which payload failed, and alerting that tells you a sync has stopped rather than leaving you to infer it from a discrepancy three weeks later.