Web3 Blockchain Developer (Healthcare EHR MVP)
About the Project
I’m building an early-stage MVP called Healthcare EHR-Demo.
It explores how blockchain can be used to improve access control and auditability for healthcare data systems.
This is not a generic dApp. The focus is on permission design, audit trails, and compliance-oriented architecture.
Problem Context
Healthcare data is highly sensitive and regulated (HIPAA-style requirements and similar frameworks).
Most existing systems rely on centralized access control. While they may be compliant on paper, they have limitations:
access permissions are not fully transparent over time
audit trails are often fragmented or system-specific
it is difficult to verify how access rights changed historically
What I’m Exploring
Instead of relying on implicit centralized trust, the system separates concerns:
Patient data stays encrypted off-chain
Access permissions are recorded on-chain
Every access request and permission change is traceable and verifiable
So the model becomes:
data ownership → explicit permission → verifiable access history → auditability by design
Key Technical Focus
This is a system design problem as much as an implementation task.
Core challenges include:
Designing a permission model that supports grant / revoke / update flows
Ensuring auditability of all access events over time
Handling on-chain vs off-chain responsibility split
Preventing inconsistent or hidden access states
Keeping the system usable in real workflows (not just theoretical compliance)
MVP Scope
The MVP is a simplified prototype to validate the architecture:
Basic patient record structure (off-chain storage assumed)
On-chain permission management (grant/revoke access)
Event logging for access requests
Simple interface to demonstrate permission flow
Basic audit trail view
Tech Stack (Flexible)
Open to your suggestions, but likely:
Solidity (or equivalent smart contract layer)
Ethers.js / Web3.js
React / Next.js for interface
Off-chain storage (IPFS or database abstraction)
Ethereum L2 (preferred for cost and speed)
What I’m Looking For
Experience with smart contracts or blockchain systems
Understanding of access control / permission systems
Ability to design clean on-chain + off-chain separation
Comfort working with system-level tradeoffs (not just UI work)
Healthcare experience is a plus, but not required.
Engagement Model
This starts as an MVP contract via LaborX.
If the system design proves viable and we work well together, this will continue into a long-term build toward a production-grade healthcare permission system.
Budget
Open, based on scope and experience. initialy $12000 ~ $14000 monthly
To Apply
Please include:
Relevant blockchain / smart contract experience
Any work related to permissions, identity, or access control systems
Your suggested architecture approach (on-chain vs off-chain split)
Estimated timeline for MVP delivery
If this kind of systems-level problem is interesting, feel free to reach out.
