Backend development and API integrations in Missouri
Need the system behind your website or app built? Sentinel Web Systems helps businesses scope and develop backend systems, API integrations, data workflows, and automation. Based in Poplar Bluff, Missouri, we work directly with clients locally and remotely to connect interfaces, business rules, and the services a product depends on.
Discuss your project
The business logic behind your application
A backend handles the work that should not depend on a browser alone: validating submissions, storing records, applying business rules, and checking access. The first step is to map the workflow and decide what data the system needs, who can use it, and what should happen when a request fails. Those decisions shape implementation and testing.
Connect tools through APIs and webhooks
API integrations let systems exchange information. Webhooks can trigger work after an event, such as a payment or a form submission. Common project needs include connecting Stripe payments, CRM records, bookings, and internal tools. Integration scope depends on the provider’s available API, account permissions, limits, and subscription requirements.
Data, permissions, and failure handling
A useful backend needs more than an endpoint that works once. Project planning should cover data validation, user roles, server-side authorization, duplicate events, error handling, and operational visibility. We identify the relevant requirements for your application and include them in the agreed scope. Security and performance requirements should be tested against the actual system.
Existing systems and new builds
Bring an existing frontend, a system that needs an integration, or an idea for a new application. Share the current stack and API documentation when available; do not send passwords or secret keys through the contact form. An initial technical review establishes feasibility, dependencies, and the work needed before a delivery estimate. Backend projects are custom quoted at the published $125 hourly development rate.