I implement secure authentication and role-based access control systems for web applications. This is a core part of every project I build, including CuraNet, a healthcare records platform where access control had to be airtight. There, I built a consent-based system where patients can grant, revoke, and time-limit provider access to their records, with full audit logging on every access event.

What's included:

JWT-based authentication setup

Role-based access control (RBAC) with granular permissions

Consent or approval-based access flows, if your project needs them

Audit logging for sensitive actions

Input validation and structured error handling

If your app handles sensitive data, whether that's healthcare, finance, or user records, getting access control right matters more than almost anything else in the system. This is the part of the stack I've spent the most time getting right.