When two systems have no integration, we build one — custom APIs and middleware that make your tools talk to each other.
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When your systems need to communicate and no off-the-shelf connector exists, System Strats builds custom API integrations. We develop REST APIs, webhook handlers, and middleware services that connect your systems with custom business logic, data transformation, and reliable error handling.
Integration platforms handle the common cases well. But your business isn't entirely common. You have a legacy system with no modern API. You need custom business logic that runs between two systems. You have a proprietary data format that no connector supports. You need real-time processing that middleware platforms can't deliver at the volume you require. These gaps are where custom API development fills in. Without it, you're left with manual workarounds, CSV exports, copy-paste processes, and the human errors that come with them. Custom APIs turn those gaps into automated, reliable connections that your team never has to think about.
Your integration platform doesn't have a connector for one of your systems. Maybe it's a niche industry tool, a legacy platform, or an internal application that was never designed to integrate with anything else.
The integration requires conditional routing, multi-step calculations, or custom data transformation that goes beyond what drag-and-drop workflow builders can handle cleanly.
You need to process thousands of transactions per minute, handle real-time inventory updates, or sync data with sub-second latency. Standard middleware can't keep up at the volume and speed you need.
Your internal tools store valuable data but have no way for other systems to access it programmatically. Teams resort to exporting spreadsheets and manually re-entering data across platforms.
We build APIs the way production software should be built: with proper authentication, comprehensive error handling, retry logic, rate limiting, monitoring, and documentation. Every custom integration we deliver is designed to run reliably without constant attention. We choose the right technology for the job, whether that's Node.js for high-concurrency webhook processing, Python for data-heavy transformations, or serverless functions for lightweight event-driven tasks. We don't over-engineer, but we don't cut corners on the things that matter for production reliability.
Purpose-built APIs that expose your systems' data and functionality with proper authentication, versioning, rate limiting, and comprehensive documentation. Designed for both internal consumption and third-party access.
Event-driven endpoints that receive, validate, and process webhooks from platforms like Shopify, Stripe, HubSpot, and any system that supports outbound notifications. Built with signature verification, idempotency, and retry-safe processing.
Custom middleware that sits between your systems, handling data transformation, business logic, routing, and orchestration. Acts as a translation layer so each system speaks its own language while data flows seamlessly.
Purpose-built connectors for systems that lack native integration support. We reverse-engineer proprietary formats, work with legacy protocols, and build reliable bridges to systems that were never designed to connect.
OAuth 2.0 flows, API key management, JWT implementation, and secure credential storage. Every API we build follows security best practices so your data stays protected in transit and at rest.
Health check endpoints, structured logging, performance metrics, and alerting integration so you know your custom APIs are running correctly and can diagnose issues quickly when they arise.
We define the endpoints, data contracts, authentication method, and error handling strategy. You review the API specification before we write a single line of code.
We build the API with comprehensive test coverage, proper error handling, and production-grade logging. We test against real system data and edge cases, not just the happy path.
We deploy to your infrastructure or a managed platform, run end-to-end validation, and verify performance under realistic load. We confirm everything works before declaring it production-ready.
We deliver complete API documentation, runbooks for common issues, and knowledge transfer so your team can maintain, extend, and troubleshoot the integration independently.
We build integration software, not enterprise applications. That focus means we understand the unique challenges of API development: handling rate limits, managing authentication flows, processing webhooks reliably, and building systems that recover gracefully from failures. We primarily build with Node.js and Python, choosing the right tool based on your requirements and your team's ability to maintain the code after handoff. Every API we deliver comes with documentation, monitoring, and the confidence that it's built for production, not just a proof of concept.
Tell us about your project and we'll get back to you within 24 hours.