Full-Stack Developer: Demo-Ready Voice-Enabled Clinical Decision Support (React/AWS/AI)

Primaxis Health: Demo-Ready Voice-Enabled Clinical Platform

Project Overview

We're building an AI-powered clinical decision support tool for anesthesia professionals. We need an experienced full-stack developer to create a demo-ready voice interface for our emergency protocol system.

Current State:

- React PWA frontend with JWT authentication
- OpenWebUI integration (AI chat interface)
- AWS infrastructure (ECS, RDS, S3)
- Dify AI workflow orchestration

What's Broken/Missing:

- Chat history retrieval needs fixing
- Voice interface (speech-to-text and text-to-speech)
- Backend proxy for HIPAA compliance
- Production deployment readiness
- Comprehensive documentation

Your Mission

Build a simulation-ready malignant hyperthermia protocol experience where:

1. Voice-First Interaction: Users can speak naturally to initiate and navigate clinical protocols
2. Collaborative Guidance: System provides step-by-step protocol guidance with closed-loop confirmations
3. Clinical Safety: Weight-based drug dosing calculations with verbal confirmation required
4. Fallback Resilience: Automatic switch to text if voice fails, resuming from last checkpoint
5. Clinical Export:*Session transcripts exportable as PDF/CSV for medical documentation
6. Sub-3-Second Latency: Voice interaction loop completes in under 3 seconds

Technical Deliverables (4 Phases)

Phase 1: Foundation (Weeks 1-2) - 60 hours

- Set up staging environment (staging.primaxis.health)
- Build HIPAA-compliant Node.js backend proxy (prevents API key exposure)
- Fix chat history retrieval bug
- Integrate Dify production workflow connection
- Documentation: Network architecture diagram

Phase 2: Voice Pipeline (Weeks 3-6) - 90 hours

- Speech-to-Text: Push-to-talk interface → AWS Transcribe Medical
- Text-to-Speech: AWS Polly Neural voices with playback controls
- Voice Commands: Finite vocabulary for protocol navigation
- Safety UX: Closed-loop confirmations for critical actions
- Mobile-responsive (iOS Safari, Android Chrome)
- Latency optimization to achieve <3s target

Phase 3: Clinical Workflow (Week 7) - 45 hours

- Integrate malignant hyperthermia protocol content
- Implement weight-based drug dosing calculator
- Build clinical documentation export (PDF/CSV with timestamps)
- CloudWatch operational logging
- Demo dry-runs and contingency playbook

Phase 4: Production Deployment (Weeks 8-9) - 30 hours

- Deploy production environment at primaxis.health
- Automated deployment pipeline (GitHub Actions or CodePipeline)
- HIPAA security checklist completion
- Consolidated documentation bundle
- 90-minute recorded knowledge transfer session

What We Provide

- AWS account access (IAM user with appropriate permissions)
- GitHub repository access
- Dify collaborator access
- Notion workspace for project management
- Clinical content for emergency protocols
- Twice-weekly sync meetings (30 min)
- 24-hour review turnaround on deliverables

What We're Looking For

Must Have:

- 3+ years React development experience
- Strong AWS experience (ECS, RDS, S3, Lambda preferred)
- RESTful API design and backend proxy architecture
- Speech-to-text/text-to-speech integration experience
- Docker and CI/CD pipeline knowledge
- Clear communication and proactive blocker flagging

Nice to Have:

- Healthcare/HIPAA compliance experience
- AI/LLM integration experience (OpenAI, Claude, Dify)
- Voice interface UX design
- PostgreSQL optimization
- WebRTC or real-time audio streaming

Work Style:

- Comfortable with 25-30 hour/week commitment
- Available for Tuesday/Thursday sync calls (timezone flexible)
- Daily async updates via Notion
- Self-directed with strong documentation habits

Budget & Payment

Total Investment: $7,875 - $10,800
Payment Structure Options:

1. Milestone-based: 10% upfront, 25% per phase (4 phases), 15% final
2. Hourly: $35-45/hour via Freelancer.com, weekly invoices

AWS Costs: Estimated $100-200/month additional (billed separately to us)

Timeline

- Start Date: November 18, 2025 (flexible within 1 week)
- Demo Milestone: Late December 2025 (date TBD)
- Final Delivery: January 13, 2026
- Holiday Accommodation: Flexible scheduling around Thanksgiving, Christmas, New Year's

How to Apply

Please include in your proposal:

1. Relevant Experience:
- Link to 2-3 similar projects (React + AWS + voice integration preferred)
- Describe your most complex AWS deployment
- Any healthcare/HIPAA projects you've worked on
2. Technical Approach:
- How would you structure the backend proxy for HIPAA compliance?
- What's your strategy for achieving <3s voice latency?
- How would you handle voice interface fallback to text?
3. Availability:
- Confirm 25-30 hours/week availability
- Your timezone and preferred sync call times
- Any planned unavailability during project timeline
4. Proposal:
- Estimated hours for Phase 1 (Foundation) as proof of understanding
- Your preferred payment structure (hourly vs milestone)
- 3 references from similar projects

Red Flags (Please Don't Apply If):

- Generic "I can do everything" proposals
- No AWS or voice integration experience
- Unable to commit to weekly hour targets
- Unavailable for December work due to holidays

Why Work With Us

- Mission-Driven: Building AI tools that save lives in clinical emergencies
- Growth Opportunity: Right of first refusal for post-demo expansion work
- Collaborative: Founder is hands-on technical CRNA with deep domain knowledge
- Modern Stack: React, Node.js, AWS, Dify, OpenWebUI
- Learning: Exposure to cutting-edge AI orchestration in healthcare

Next Steps

Qualified candidates will be invited to:

1. 30-minute screening call (technical + culture fit)
2. 60-minute technical discussion (architecture review of SOW)
3. Contract negotiation and kickoff (November 18 target)

Questions? Include them in your proposal - we'll address during screening.

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About Primaxis Health:
We're a bootstrapped healthcare AI startup building clinical decision support for anesthesia providers. Our mission: "Empower confident clinical care by providing anesthesia providers with a trusted AI colleague that reduces cognitive burden at the point of care."

Live product: https://primaxis.health
Marketing site: https://primaxishealth.com