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API Development & Integration

Connect new and legacy systems so data flows

Whether ERP, warehouse systems, IoT platforms or government systems — GNS links them with APIs and middleware, eliminating duplicate entry and information silos while keeping data secure.

  • System-to-system integration
  • RESTful API development
  • Middleware & message queues
  • Real-time / batch data synchronisation
  • API monitoring & 24/7 support
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Connect new and legacy systems so data flows

Outcomes

Measurable results

100M+
Train data logs processed daily
80%
Potential reduction in document workflow time
24/7
API and system monitoring support
ISO 27001
Information security processes

Capabilities

What we deliver

  1. System integration

    Connecting ERPs, warehouse management systems, IoT platforms, government systems and legacy applications to remove duplicate entry — such as our in-house DL2007 railway black box, which reads onboard devices over RS232 and decodes them with AI.

  2. API development

    RESTful APIs, webhooks and SDK design with documentation, versioning and access control.

  3. Middleware & message queues

    RabbitMQ and similar middleware for high-throughput data and asynchronous workflows, designed with layered defence.

  4. Data synchronisation & migration

    Real-time and batch sync, ETL and legacy migration without disrupting operations during transition.

  5. Real-time data platforms

    Aggregating sensors, devices and business systems into a real-time platform for monitoring and analytics.

  6. Monitoring & maintenance

    API availability monitoring, alerting and 24/7 support to keep critical integrations running.

Solution details

Case: instant goods dimension measurement

We built a real-time goods dimension measurement system for the logistics industry with a custom API for warehouse management system (WMS) data exchange — goods are measured on arrival and flow straight into warehouse processes, removing manual entry and re-measurement.

Case: the DL2007 railway black box and a 200+ train platform

We designed and produced the DL2007 railway black box in-house. It passed EN50155 testing and collects onboard device data over traditional RS232 serial interfaces, decoding and analysing it with AI. Data is uploaded through encrypted channels to our cloud platform, now covering more than 200 trains across Hong Kong — continuously capturing data and analysing onboard alarms so operators know asset status without visiting the site.

Middleware and security

When integrating multiple systems, we commonly use message queues for asynchronous workflows and design security with a layered-defence principle — even if components such as RabbitMQ face a known vulnerability, buffering and isolation protect the core systems.

Why GNS

  • In-house hardware, software and networking expertise makes integrations more complete
  • Proven large-scale data integration (railway, logistics, government)
  • Full API documentation and versioning
  • 24/7 monitoring support after go-live

Real systems

The DL2007 and SACEM systems in action

DL2007 railway black box
The DL2007 railway black box — an EN50155-certified onboard data logger
Onboard device interface boards
Onboard interface boards (RS-232) that tap into train equipment for data collection
Data logger connectivity architecture
Data logger connectivity: RS-232, LAN and encrypted LTE upload
SACEM alarm monitoring platform
SACEM alarm monitoring platform: live events, diagnostics and logs

FAQ

Service questions

Can you integrate with legacy systems?

Yes. We connect legacy systems via APIs, middleware and data migration — and when no API exists, we integrate at the database layer or through file exchange.

How long does API development take?

A single integration typically takes 2–6 weeks; platform integrations spanning many systems are delivered in phases with a pilot first.

How is data security ensured?

All APIs support TLS encryption, key/token authentication and access control, and are developed and operated under ISO/IEC 27001 processes.

Do you support real-time data?

Yes. We provide real-time APIs, webhooks or message-queue architectures, selecting the right design for your data volume and latency requirements.

Integrate your systems

Tell us which systems and data you want connected and we will recommend the architecture and timeline.

Contact GNS