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GWHYYY

Integrations & infrastructure

APIs, SDKs, backend services, MCP, realtime systems, and automation that make products connect and keep running.

Start with this service selected, or describe the problem and I will suggest the right scope.

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Direct: work@gwhyyy.com

Most products are a network of services, not a single application. I build the interfaces between them: typed API clients, SDKs, webhooks, synchronization jobs, realtime channels, and the backend services that hold the integration together.

I also design developer-facing surfaces such as SDKs and MCP servers, where the public contract has to be small, typed, documented, and predictable across failure states.

What this can include

  • Backend APIs and service design
  • Dart and Flutter SDKs, typed API clients
  • Third-party API integration and synchronization
  • Webhooks, queues, and background processing
  • MCP servers and agent-facing APIs
  • Realtime systems and developer tooling

Example engagements

  • Connect a product to several external APIs reliably
  • Publish an SDK for an existing service
  • Repair an integration that silently drops records
  • Build an MCP server that exposes a catalog to agents

Examples describe the shape of the work, not past client engagements.

Not sure which service fits?

Choose “Other / not sure” in the inquiry form and describe the problem. I will suggest the right scope.

Describe your project