API Design & Systems Integration
Connect disparate systems and unlock value across your tech stack. We design APIs that developers love and integrations that simply work. We can take critical legacy systems with embedded intellectual property and make them available for new solutions. MCP layers can expose your data in new ways that AI can utilise to bring new efficiencies.
Systems that talk to each other properly.
Most organisations do not have a software problem so much as a joining problem: an ERP that does not know what the warehouse knows, a portal that cannot see the invoice, a legacy system holding data nobody else can reach. Integration work is what unlocks the value already sitting in your stack.
We design APIs that developers can use without ringing you, and integrations that fail loudly and recover cleanly. Where a legacy system holds critical business logic, we put a modern interface in front of it instead of rewriting it — including MCP layers, so your data can be used by AI tooling safely.
What we build:
- Documented REST or GraphQL APIs, versioned so today's clients keep working tomorrow.
- Integrations with retries, idempotency and dead-letter handling — not fire-and-forget scripts.
- Modern interfaces over legacy systems, so their logic can be reused rather than rebuilt.
- Authentication, rate limiting and audit logging on every public surface.
- MCP endpoints that expose your data to AI tools under your own permissions.
Contracts first, then code.
Integrations go wrong in predictable ways. These four habits prevent most of them.
Contract first
The API shape is agreed and documented before implementation, so both sides can build in parallel against something stable.
Resilient by design
Retries with backoff, idempotent writes and dead-letter queues, so a partner's outage becomes a delay rather than lost data.
Secured at the edge
Token-based auth, scoped permissions, rate limits and full request logging on anything exposed outside your network.
Observable in flight
Every message traceable end to end, with alerting on the queues that matter, so you find failures before your partner calls.
Design the contract, then build both sides
We start with the interface: the resources, the payloads, the errors and the versioning rules, written as an OpenAPI or GraphQL schema. From there your teams and ours can build in parallel, testing against a mock long before the real service exists.
- Published schema and documentation from day one
- Mock services so client work starts immediately
- Versioning agreed up front, so upgrades never break integrations
Technologies
The technology stack we use on this work includes, but is not limited to:
GraphQL
Azure Service Bus
C#
.NET
Node.jsCompleted projects
The same work, delivered. Every number came out of production.
React
Other services.
Custom Enterprise Software
Architecting robust, scalable enterprise systems with the Microsoft C#/.NET and Blazor ecosystem. From complex business logic to high-throughput APIs, built to perform and endure.
Web Application Development
Full-stack web applications that are fast, accessible, and maintainable. Modern React frontends powered by robust Node.js APIs. Built on SQL Server or PostgreSQL, deployed on Azure or AWS — your vision, our expertise.
Mobile App Development
Cross-platform mobile apps with native performance. One codebase, two platforms, zero compromise on user experience — make it easy for clients to work with you.
Ready to start?
Got a problem to solve?
Whether you're starting from scratch, scaling up, or dealing with a system under stress — let's talk about what we can build together. We can start by ensuring your systems continue to operate while a strategy is developed to make the most of your investment.