AxeTos (ContextQA)
Engineering Overview
AxeTos (part of the ContextQA suite) is a comprehensive solution for web accessibility. It combines a powerful Chrome extension with a dedicated Node.js backend to audit websites against WCAG A, AA, and AAA standards. Beyond just identifying issues, it offers a revolutionary 'instant fix' capability via script injection.
The Problem
Web accessibility (WCAG) compliance is a critical but often manual and neglected process. Identifying and fixing thousands of accessibility violations across large-scale sites creates a significant developmental bottleneck.
The Solution
Comprehensive auditing suite that runs detailed WCAG A/AA/AAA diagnostics. It features a unique remediation engine that applies persistent fixes via script injection, allowing for 'zero-code' accessibility fixes.
Key Engineering Challenges
Building a non-destructive DOM manipulation engine that reliably applies accessibility fixes (contrast adjustments, ARIA role remediation) across varied third-party frameworks without interfering with existing site logic. Shipped in production during my first 2-3 months at ContextQA.
Core Capabilities
System Architecture
System Architecture
Frontend (Extension)
Backend (Service)
Infrastructure
"A comprehensive auditing and remediation suite that identifies accessibility violations and generates persistent fixes."