PLATFORM ARCHITECTURE

How BulletTrain Connects Clinical and AI Systems

A secure, governed transport layer that moves clinical and AI data with speed, reliability, and full traceability.

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SYSTEM OVERVIEW

System Overview

Four planes working together — Integration, Communication, Intelligence, and Execution — to deliver governed connectivity between clinical systems, AI agents, and 26+ sibling applications.

Symphonix Health four-plane platform architecture — Integration (BulletTrain), Communication (GHARRA + Nexus A2A + Bridge SDK), Intelligence (Bevan LLM + prompt-engine), Execution (25 clinical agents, 26 sibling apps, Command Centre, signalbox-mcp)

Faster Integration

Deploy new system connections in days, not months.

Safer AI Deployment

AI workloads are isolated from clinical data paths.

Full Governance

Every data movement is traced, audited, and compliant.

HELIXCARE FLAGSHIP

One patient. Every sibling. Live.

HelixCare exercises a single synthetic patient journey end-to-end across every Symphonix Health sibling, the BulletTrain HIE, the Nexus A2A agent fabric, and the GHARRA federation — verified at W11 with zero emulators, zero fixtures, zero mocks.

HelixCare complete-platform showcase: BulletTrain hub surrounded by six clusters of real sibling services, with W11 readiness policy
Figure 2 — HelixCare complete-platform composition. 26+ real sibling services around the BulletTrain HIE hub.
PATIENT JOURNEY

One patient. Eight stops. One platform.

A representative HelixCare journey from 999 dispatch through to community follow-up. Every cross-system handoff is a real FHIR or Nexus A2A message, mediated by the BulletTrain HIE, audited at the boundary, and governed by GHARRA trust policy.

Cross-system patient journey from 999 to community follow-up, with seven actor swim-lanes and the BulletTrain hub mediating every handoff
Figure 3 — Cross-system patient journey. Time axis runs T+0 (dispatch) to T+1 week (citizen-portal follow-up).
INTEGRATION BOUNDARY

Real services inside. Real systems outside.

The Symphonix Bridge SDK is the one boundary across which clinical and operational data flows. Inside it: 26+ real sibling applications, no internal mocks. Outside it: real third-party systems via standards. Below: the retired symphonix-emulator-kit and the twelve real services that replaced it.

Symphonix integration boundary: real sibling services inside, real external systems outside, Bridge SDK as the standards-mediated boundary, retired emulator-kit shown with twelve replacement services
Figure 4 — Integration boundary. Bridge SDK speaks FHIR R4, HL7v2, DICOM, X12, and Nexus A2A.
DATA FLOW

How Data Moves Through the Platform

From ingestion to delivery, every step is governed, traced, and auditable.

Step 01

Ingestion

Data enters via Fast Healthcare Interoperability Resources (FHIR), Health Level 7 version 2 (HL7v2), Clinical Document Architecture (CDA), X12, Digital Imaging and Communications in Medicine (DICOM), or Application Programming Interface (API).

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Step 02

Classification

Bevan Large Language Model classifies content as clinical, operational, or AI-bound — determining the correct routing path.

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Step 03

Routing

The SignalBox control plane directs data to the right destination with governance checks applied at every decision point.

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Step 04

Delivery

Data arrives at clinical systems, AI models, or analytics platforms — fully traced with a complete audit record.

SECURITY & GOVERNANCE

Security and Governance — Built In, Not Bolted On

Every layer of the platform enforces security and governance by design, not as an afterthought.

Access Control

Role-based access with 6 Identity and Access Management (IAM) groups and per-agent authentication. Every request is authenticated and authorised before execution.

Audit Trail

Hash-chained transparency ledger — every action recorded and verifiable. Tamper-evident by design, with cryptographic proof of integrity.

Data Protection

Three-layer patient data detection blocks sensitive information at the boundary. Data is classified, filtered, and protected before it leaves the transport layer.

AI Workload Isolation

External AI models never see patient data. Bevan handles clinical reasoning locally, ensuring sensitive information stays within governed boundaries.

DEPLOYMENT

Deploy Where Your Data Lives

Choose the deployment model that matches your data sovereignty requirements and infrastructure strategy.

Sovereign Cloud

Hosted within your national data boundaries. Full platform, fully managed, with no data leaving the jurisdiction.

Hybrid

BulletTrain in your cloud, AI services federated. Keep clinical data on your infrastructure while accessing AI capabilities securely.

On-Premise

Full platform within your data centre — no external dependencies. Complete control over every component and data flow.

RELIABILITY

Built for Systems That Cannot Fail

Healthcare systems demand absolute reliability. Every component is designed for resilience and recovery.

Circuit Breakers

Automatic failover prevents cascading failures. When a downstream service degrades, the circuit breaker isolates the fault and routes around it.

Event Replay

Kafka-backed event bus with dead-letter recovery. Every event is persisted and replayable — no data is ever lost, even during outages.

Health Monitoring

Prometheus metrics and real-time observability across every microservice. Alerts fire before problems become incidents.

Emergency Break-Glass

Emergency requests are never blocked — the absolute healthcare safety constraint. When lives are at stake, the system guarantees access.

FULL DOCUMENTATION

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Includes detailed system diagrams, security controls, deployment topologies, and compliance mappings.

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