Developer journeys
Modernize a legacy healthcare application
Replace legacy capabilities progressively with Mediloop APIs, SDKs and connectors while keeping the existing application running during migration.
Modernize without a big-bang rewrite
Use a strangler-style modernization approach: keep the legacy application operating, place stable Mediloop APIs and connectors around selected capabilities, then migrate domains one at a time. This reduces operational risk and lets product teams demonstrate value before committing to the next cutover.
No requirement to rewrite every screen, database and integration at once.
Legacy and Mediloop-backed workflows can coexist during controlled transition periods.
Each migration boundary should have clear ownership, fallback and reconciliation rules.
The goal is progressive risk reduction, not merely replacing technology for its own sake.
Framework independence
A Mediloop API contract should not force customers to use React, Next.js or any particular UI framework. Customers can modernize their frontend on their own timeline while Mediloop APIs and SDKs evolve through explicit versioning and compatibility policies.
Assess the legacy system
| Assess | Questions to answer | Typical evidence |
|---|---|---|
| Architecture | Which modules are tightly coupled? Which can be isolated? | Dependency map, service boundaries, shared database usage |
| Interfaces | Which proprietary APIs, files and protocols are still in use? | HL7 feeds, custom SOAP/REST, file exports, DICOM endpoints |
| Data | What is authoritative and where are identifiers mastered? | Patient, order, specimen, study, prescription and user identifiers |
| Operations | Which workflows are most expensive or fragile to change? | Incidents, manual workarounds, release history, support volume |
| Compliance | Which components carry security, audit or regulatory obligations? | Access logs, certifications, data residency, consent model |
Choose replacement boundaries
Identity boundary
Replace authentication and authorization while keeping the rest of the application intact.
Workflow boundary
Move appointments, teleconsultation, prescriptions or notifications behind Mediloop services.
Interoperability boundary
Replace proprietary exchange with FHIR/HL7/DICOMweb and governed semantic mapping.
Connector boundary
Wrap legacy devices and external systems with Connector SDK or Workstation Agent adapters.
Run side by side
1
Users
Continue using the existing product
2
Routing layer
Choose legacy or Mediloop path by capability
3
Legacy module
Still serves non-migrated functions
4
Mediloop capability
Serves the migrated domain
5
Observe & reconcile
Compare outputs, errors and workflow outcomes
Use feature flags, routing rules or adapter boundaries to control cutover.
Keep audit and correlation identifiers across both sides.
Define rollback before activating production traffic.
Reconcile business/clinical state until the new domain is authoritative.
Migrate capability by capability
| Legacy capability | Possible Mediloop replacement | Migration pattern |
|---|---|---|
| Custom login / directory | Identity & SSO | Federate first, then migrate sessions and application authorization |
| Legacy appointment module | Scheduling / Appointments | Mirror or route selected appointment workflows before cutover |
| Proprietary clinical exchange | FHIR API + connectors + MSIS | Map existing payloads, validate semantics, then phase out proprietary contracts |
| Custom PACS access layer | Imaging Connectors / DICOMweb | Keep PACS/VNA, replace application access and metadata integration |
| Hard-coded analyzer/device integration | Connector SDK / Workstation Agent | Wrap device-specific logic behind versioned adapters |
| Home-grown notifications | Webhooks / events | Publish canonical state changes and retire polling/manual synchronization |
Data and interoperability migration
Preserve source IDs and original codes during transformation.
Use deterministic identity matching and controlled reconciliation for ambiguous matches.
Separate one-time historical migration from ongoing synchronization.
Define authoritative ownership for each data domain before cutover.
Use MSIS for clinical terminology normalization rather than burying semantic translation inside generic application code.
Do not confuse migration with normalization
A migrated record can remain semantically inconsistent. Migration plans should explicitly include code systems, units, mappings, provenance and quality rules where clinical meaning is involved.
Frontend and framework modernization
Keep API contracts independent from React, Next.js, Angular, Vue, native mobile or desktop UI choices.
Use generated clients or SDKs where they improve developer experience, but do not expose internal framework assumptions.
Modernize UI pages progressively while backend capability migration proceeds in parallel.
Test contract compatibility before upgrading framework or runtime versions.
What Mediloop should absorb
Mediloop should manage most infrastructure and standards evolution — security patterns, SDK maintenance, healthcare profiles and connector compatibility — behind explicit versions and migration guidance. Breaking changes still require transparent deprecation and migration paths.
Production cutover
1
Sandbox
Functional mapping and synthetic-data tests
2
Staging
Production-like end-to-end validation
3
Shadow / dual run
Compare legacy and Mediloop outcomes
4
Controlled cutover
Enable selected tenants, sites or workflows
5
Monitor
Observe errors, latency and reconciliation
6
Retire legacy
Only after stable acceptance criteria are met
Example modernization roadmap
| Phase | Example scope | Exit criteria |
|---|---|---|
| 1. Foundation | Identity, tenant context, observability | Users can authenticate and calls are auditable |
| 2. Interoperability | FHIR facade, webhooks, connector adapters | New and legacy systems exchange consistent data |
| 3. Domain migration | Scheduling, prescriptions, imaging or laboratory workflows | Selected domain operates reliably through Mediloop |
| 4. UI modernization | New frontend over stable APIs | Feature parity and user acceptance achieved |
| 5. Decommission | Remove obsolete services and integrations | No production dependency remains on retired components |