RESTful API
design & development
in Seattle

Cost depends on project complexity, scope, and timeline — a REST API connecting two internal systems differs significantly in scope from a public API with authentication, rate limiting, versioning, and developer documentation. The number of endpoints, data volumes, and integration targets all affect the estimate. Exact pricing is discussed individually after reviewing your project brief.

Seattle's business base spans technology companies along the Eastside corridor whose products require third-party integrations and public API access for developer ecosystems, retail and ecommerce brands in the South Lake Union and Capitol Hill areas connecting inventory, fulfillment, and customer data across multiple platforms, maritime and logistics operators serving the Port of Seattle whose operational systems need to exchange data with freight management, customs, and vessel tracking platforms, and healthcare technology companies clustered around the University of Washington medical corridor requiring HIPAA-compliant data exchange between clinical and administrative systems.

Timeline depends on the number of endpoints, complexity of data transformations, and how many third-party systems need to be connected. A focused internal integration API moves faster than a public-facing API with full documentation, versioning strategy, and a developer portal. Exact timelines are confirmed after your Seattle project brief is reviewed and the integration scope is defined.

REST is the most widely used architecture — it uses standard HTTP methods and works well for most web and mobile integrations. GraphQL gives clients precise control over what data they request in a single query, which suits data-heavy or complex applications where multiple REST calls would otherwise be required. Webhooks push data in real time when specific events occur rather than waiting to be polled — useful for Seattle clients needing immediate notification of inventory changes, order status updates, or logistics events at the Port of Seattle. The right approach depends on what systems are being connected and how they need to exchange data — we recommend during scoping.

Yes — third-party integration is one of the most common API development requests from Seattle clients. Technology companies along the Eastside corridor frequently need integrations with cloud platforms, developer toolchains, and enterprise software ecosystems. Retail and ecommerce brands need connections to fulfillment partners, inventory management systems, and marketing platforms. Maritime operators serving the Port of Seattle need APIs linking operational software with freight tracking, customs documentation, and logistics management platforms. We map all integration requirements during the discovery phase and confirm API availability before development begins.

We implement authentication via API keys or OAuth 2.0 depending on the use case, along with rate limiting, input validation, and encrypted transport as standard components. For Seattle clients in healthcare technology where HIPAA data handling requirements apply, or financial technology companies with regulatory compliance obligations, we discuss specific security requirements during project scoping. Security is designed into the API architecture from the first technical decision — not addressed after endpoints are built and in production use.

You get a dedicated project manager throughout the build. We work in two-week sprints with working endpoints delivered to a staging environment at every stage — Seattle clients can test real API responses against their systems before the next cycle begins rather than reviewing documentation alone. All technical decisions, integration status, and open issues are tracked in a shared project board. Developer documentation is produced alongside the build so handoff materials are complete at launch rather than produced under deadline pressure afterward.

We provide a post-launch stabilization period to address any integration issues that surface under real production traffic. APIs require ongoing maintenance — third-party platforms update their own APIs, usage patterns reveal performance bottlenecks, and business growth adds new integration requirements over time. Seattle clients who expand their integration landscape — connecting additional systems, adding new endpoints, or scaling usage as their Pacific Northwest and national customer base grows — typically stay with us on a retainer. Support and development terms are agreed in the project contract before delivery.