Criston Mascarenhas

Lead engineer for enterprise accessibility testing products, architecting and building tools used by accessibility professionals and enterprise clients.

A11yInspect - Browser Extension (Link)

• Designed and built Chrome extension for real-time WCAG 2.x compliance testing in live web pages
• Implemented automated accessibility rules engine combining DOM analysis, ARIA validation, and visual checks
• Built in-page code highlighting system mapping accessibility violations to exact DOM nodes and source locations
• Developed visual testing utilities for heading structure analysis, tab order visualization, and color contrast validation
• Optimized scan algorithms to run efficiently on complex, production-scale web applications

A11yNow - Automated Testing Platform (Link)

• Built browser-driven accessibility automation engine using Playwright with DOM traversal and computed style analysis
• Designed extensible rule evaluation framework with versioned WCAG mappings for continuous standards updates
• Implemented data architecture for issues, pages, scans, and historical trend analysis in PostgreSQL
• Integrated hybrid automation workflow combining machine detection with human validation for accurate reporting

Platform Engineering

• Built backend services with Node.js, Express, and PostgreSQL (Drizzle ORM) supporting multi-tenant data and role-based access
• Implemented scheduled scans, authentication management (HTTP Auth, Cookie Auth, Scripted Login), and secure credential storage
• Created data visualization dashboards with React for accessibility metrics and compliance trend reporting
• Mentored developers through code reviews and ensured clean architecture and maintainable codebases

• Developed and maintained reusable React Native and Next.js components for internal design system
• Executed proof-of-concept applications evaluating emerging technologies including React Query, Zustand, and Supabase
• Contributed accessible, composable components to open-source library adaptui/react-native-tailwind
• Collaborated with design team using Figma to implement responsive interfaces following accessibility best practices
• Integrated Supabase backend with PostgreSQL for data synchronization and authentication

• Led frontend migration of medical supply chain management system from AngularJS to Angular 12
• Developed new features including inventory tracking, order management, and reporting modules
• Collaborated with cross-functional teams to gather requirements and ensure alignment with project goals
• Implemented unit and integration tests to maintain code quality and reduce production bugs
• Conducted code reviews and maintained technical documentation

• Developed and maintained Angular components for healthcare supply chain management application
• Implemented responsive UI features using Angular Material and SCSS ensuring cross-browser compatibility
• Participated in Agile ceremonies including daily standups, sprint planning, and retrospectives
• Resolved production bugs and implemented performance optimizations for frontend components
• Wrote technical documentation for component libraries and APIs

• Completed internship program with training in JavaScript, HTML, CSS, and Angular fundamentals
• Built interactive web components as part of training projects
• Collaborated with senior engineers on production codebase, contributing bug fixes and minor enhancements
• Received full-time offer as Associate Software Engineer upon completion

• Contributed to open-source initiatives promoting free software adoption in educational institutions
• Participated in community workshops and events focused on web development and open-source technologies
• Collaborated with community members on documentation and project contributions

• Designed user interface mockups and wireframes for web applications
• Converted designs to responsive HTML/CSS code
• Collaborated with development team to ensure design feasibility and optimal user experience