API & Middleware Integration
Reliable Integrations.
Fewer Incidents.
Better Sleep.
Bespoke API and middleware solutions engineered for stability, transparency, and long-term change - open-source-first and designed to stay out of the way.
Lock In Your Integration Plan
Stop Paying the Price for Systems That Don't Agree
When core systems cannot reliably share data, something is broken: teams end up re-keying information, chasing missing updates, and firefighting "it worked yesterday" failures. The cost shows up fast - delayed fulfilment, billing leakage, compliance gaps, poor reporting, and a growing backlog of manual checks that quietly becomes business-as-usual.
The fix is not another unreliable point-to-point link. What's needed is a bespoke integration layer that matches real workflows, integrates cleanly with existing platforms, and makes change safe. With the right API and middleware approach, data moves with confidence, exceptions are handled deliberately, and operational risk drops - without forcing a rip-and-replace programme.
Here is what a stable integration layer delivers:
- Bespoke API and middleware design aligned to how work actually flows, not vendor diagrams
- Canonical data models, mapping, and validation to stop mismatches spreading downstream
- Adapters for legacy and niche systems that create stable contracts without risky rewrites
- Orchestration and event-driven patterns to reduce fragility and improve resilience at scale
- Security and governance by design (auth, access control, auditability, policy enforcement)
- Observability built in with actionable monitoring, alerting, and runbooks for faster resolution
If incidents, manual workarounds, or unreliable reporting are becoming normal, it is time to put a proper integration layer in place. Lock In Your Integration Plan
Platforms & Technologies We Work With
Non-exhaustive - depends on requirements.
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API Design & Delivery
REST, GraphQL, gRPC, OpenAPI/Swagger
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Eventing & Messaging
Apache Kafka, RabbitMQ, NATS
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API Gateways & Edge
Kong, NGINX, Traefik, Envoy, Caddy
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Identity & Security
OAuth2, OIDC, Keycloak, JWT, mTLS
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Data & Transformation
JSON, XML, CSV, XSLT, schema validation, mapping pipelines
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Observability & Reliability
Prometheus, Grafana, ELK/OpenSearch, OpenTelemetry
Use Cases to Fix Broken Data Flows and Cut Incident Noise
Each use case is aimed at reducing incident load, operational cost, and delivery friction across real-world systems.
Built for Change, Designed for Control
Our integration services are designed to be dependable today and adaptable tomorrow. We focus on clarity, stability, and operational control - so integrations don't become fragile dependencies.
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Secure, Well-Defined Interfaces
APIs built with clear contracts, authentication, and governance. -
Consistent Data Across Platforms
Reliable synchronisation and validation to remove discrepancies. -
Automation That Reduces Manual Work
Orchestrated workflows that eliminate repetitive tasks and handoffs. -
Scalable Architecture
Patterns that support new systems, higher volumes, and evolving requirements. -
Legacy-to-Modern Connectivity
Practical bridging approaches for older applications and proprietary interfaces. -
Monitoring & Visibility
Observability and alerting to detect issues early and speed resolution.
Integration Built Around Your World
API and middleware integration delivers the most value when aligned to real operational workflows - billing, provisioning, fulfilment, scheduling, compliance, and support. We build integrations that reduce friction across teams while improving reliability and scale.
Telecoms
Automate provisioning, billing triggers, and service lifecycle actions to reduce delays and improve customer response times.
E-Commerce
Keep inventory, orders, payments, and customer data synchronised across platforms for accurate fulfilment and smoother shopping journeys.
Healthcare
Enable secure, auditable data exchange between clinical and admin systems while supporting compliance requirements.
Education
Connect student systems, learning platforms, and admin tools to simplify enrolment, reporting, and operational workflows.
Logistics
Integrate fleet, shipment, and warehouse systems to improve visibility, reduce delays, and support real-time coordination.
Manufacturing
Link production, supply chain, and sales systems to minimise downtime, improve forecasting, and maintain consistent data flows.
From Discovery to Adoption: Built to Deliver
We don't "just connect systems". We design integration as an operational capability - documented, supportable, and built to evolve as your business changes.
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Discovery & Technical Due Diligence
We run structured workshops with technical and operational stakeholders to map systems, workflows, data ownership, and failure points. You get a clear view of constraints, risks, and a recommended integration approach that matches how you actually operate.
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Solution Blueprint & Delivery Plan
We design the target architecture and choose the right patterns (API-led, event-driven, or orchestrated middleware) with security and governance built in. We also define data contracts, testing strategy, environments, and a staged rollout plan with clear milestones.
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Build, Test & Release
We develop APIs, connectors, middleware routes, and automation logic with version control, repeatable deployments, and peer review. We validate behaviour in staging, prove resilience and performance, then release with controlled cutovers to minimise disruption.
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Handover, Training & Ongoing Options
We provide documentation, runbooks, and practical training so your team can operate and extend the integration with confidence. If you want us on hand, we agree support pathways that fit your operating model, from Dedicated Support Hours to SLA-Based Technical Support.
Why Choose Onyxsis?
Proven Impact, No Smoke and Mirrors
Integration treated as a business capability, not a bolt-on.
Our Issue Diagnosis & Evaluation Suite shows what happens when integration is treated as a business capability, not a bolt-on. We delivered a unified diagnostic platform for a UK telecoms business, turning disconnected back-end tools into one clear, actionable view.
The impact was immediate and measurable. If you need results you can defend internally, that's the standard we work to.
Open-Source-First, Client-Controlled by Design
We build with open source because it keeps you in control: clearer architectures, fewer hidden dependencies, and more freedom to evolve. You get documentation, runbooks, and working knowledge transfer so your team can own what we deliver.
Small Team, Serious Accountability
You work directly with the people doing the engineering, not a revolving cast of account layers. We take on the hard integration problems, communicate transparently, and stay accountable until the outcome is right.
Support That Protects Your Uptime (and Your Team)
After go-live, we stay close to make sure your integrations remain stable as systems change, volumes grow, and priorities shift. When something breaks at 2am, you want a team that already understands your stack and can move quickly without guesswork.
For guaranteed coverage and clear response expectations, we offer SLA-Based Technical Support. For hands-on engineering help and planned improvements, Dedicated Support Hours gives you direct access to the people who built your integration layer.
If you want fewer incidents, less manual reconciliation, and data your teams can trust, let's map out a plan that fits your business and your constraints. We'll be straight with you about what's possible, what's risky, and how we'll get it done.
Make Your Systems Agree With Each Other for Once
Design an integration layer that handles legacy quirks, data mismatches, and growth without drama.
