Full-Stack Telemedicine Platform with WebRTC Group Video Streaming
The Problem
A telemedicine provider needed a platform that allowed distributed healthcare teams to conduct secure group video consultations — not just one-on-one calls, but multi-participant sessions involving physicians, specialists, and support staff simultaneously. Their existing tooling relied on general-purpose video conferencing that lacked healthcare-specific functionality: there was no way to generate e-prescriptions during a call, no shared workspace for clinical diagrams, and no integrated scheduling across multiple providers. Coordinating care across teams meant switching between disconnected tools, introducing friction into time-sensitive medical workflows and creating compliance gaps under HIPAA, GDPR, and KVB regulations.
Why Building a Compliant Group Telemedicine Platform Is Hard
Group telemedicine goes far beyond adding video chat to a healthcare application. It introduces engineering and regulatory challenges that general-purpose platforms are not designed to solve:
- Multi-participant real-time video — group calls with multiple concurrent streams require careful bandwidth management, adaptive bitrate handling, and low-latency media routing to remain usable in clinical settings where seconds matter
- Healthcare-grade compliance — HIPAA, GDPR, and KVB impose strict requirements on encryption, access control, audit logging, and data residency that must be baked into every layer of the architecture
- Clinical tooling during live sessions — features like e-prescription generation and shared whiteboards must work seamlessly inside active video calls without disrupting the consultation flow
- Multi-provider scheduling — coordinating availability across physicians, specialists, and care teams requires calendar integration that handles conflicts, time zones, and recurring sessions
- End-to-end encryption at scale — securing group video streams while maintaining low latency across multiple participants demands a purpose-built media infrastructure
- Reliability for medical workflows — dropped calls or lost data in a telemedicine session is not just inconvenient; it can directly affect patient outcomes and regulatory standing
What We Did
Architecture & Compliance Foundation
- Designed a compliant architecture hosted on Hetzner infrastructure within the EU to meet GDPR data residency requirements
- Established HIPAA/GDPR/KVB compliance controls across the full stack — encrypted data at rest and in transit, role-based access control, and comprehensive audit logging
- Set up Docker containerization for reproducible deployments and Grafana dashboards for real-time platform health, call quality, and infrastructure alerting
Core Video & Communication Platform
- Built the real-time group video streaming layer using EasyRTC (WebRTC-based), supporting multi-participant calls with adaptive bitrate and bandwidth management
- Developed the Angular frontend for clinician and patient interfaces — session lobby, in-call controls, participant management, and responsive layouts for varying devices
- Implemented the Node.js (Fastify) backend handling session orchestration, participant authentication, call state management, and secure API endpoints
Healthcare-Specific Tooling
- Integrated e-prescription generation directly into the consultation workflow — physicians create, review, and issue prescriptions without leaving the active video session
- Built shared digital whiteboards for real-time clinical diagrams and annotations, enabling specialists to collaboratively illustrate findings during group consultations
- Developed integrated calendars for multi-provider scheduling — handling availability conflicts, recurring appointments, and automated reminders across distributed care teams
Performance Optimization & Reliability
- Optimized media server configuration for low-latency group streaming across varying network conditions and participant counts
- Load-tested under concurrent multi-participant scenarios and implemented failover mechanisms and call recovery logic to ensure session continuity
- Deployed end-to-end monitoring via Grafana — tracking call quality, latency percentiles, error rates, and compliance audit trails in real time
Key Results
In Their Words
Trembit built us a platform that finally lets our care teams work together in real time — with all the clinical tools right inside the call. It changed how we coordinate care.
Their proactive team gets things done as if it were their own project.
What We Learned
Compliance is not a checkbox — it is an architecture decision
HIPAA, GDPR, and KVB requirements touch every layer: how media is encrypted, where data is stored, who can access what, and how every action is logged. We designed compliance into the infrastructure from day one — EU-based Hetzner hosting for data residency, role-based access controls across all endpoints, and audit trails built into the Fastify backend. Retrofitting compliance onto an existing platform would have meant re-architecting the entire system.
Clinical tools must live inside the call, not beside it
The value of e-prescriptions and whiteboards drops dramatically if clinicians have to leave the video session to use them. We built these as first-class components within the Angular call interface — rendering prescriptions and whiteboard canvases as in-call overlays that share session context. This kept the consultation flow uninterrupted and reduced cognitive load on providers managing complex group sessions.
Group video is a fundamentally different problem from one-on-one calls
Adding participants does not just add streams — it multiplies bandwidth requirements, introduces layout complexity, and amplifies the impact of any single point of latency. EasyRTC gave us the WebRTC foundation, but the reliability came from how we managed adaptive bitrate switching, participant prioritization, and graceful degradation when network conditions varied across participants in the same session.
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