API Development & System Integration

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Custom REST and GraphQL API development, plus integration between systems that were never designed to talk to each other. We connect CRMs, ERPs, accounting software, payment processors, shipping carriers, EHR systems, marketing platforms, and legacy databases. Work includes API design and documentation, authentication and rate limiting, webhook infrastructure, data mapping and transformation, error handling, and retry logic. We also build middleware layers that let you replace a downstream system later without rewriting everything above it.