Senior Frontend Engineer React/TypeScript Expert

William Bierwerth

917-***-**** **********@*****.*** Queens, NY

PROFESSIONAL SUMMARY:

Senior Frontend Engineer with 17+ years of experience building scalable, compliant, and data intensive platforms across healthcare and insurance. Expert in React, TypeScript, and modern UI architecture. Strong background modernizing legacy systems, improving reliability through Cypress/TDD, and using AI to accelerate development and governance workflows. Known for delivering intuitive, auditable interfaces in highly regulated environments. TECHNICAL SKILLS:

Frontend: React, TypeScript, JavaScript, React Native, Node.js, GraphQL, REST, HTML/CSS, Material UI Testing/DevOps: Cypress, Jest, TDD, Docker, CI/CD, Jenkins, GitHub/GitLab/Bitbucket Governance: Accessibility, AI Governance, Regulatory Compliance, Agile/Scrum Experience

Cigna — Senior Developer

Oct 2021 – Feb 2026 New York, NY

Led frontend architecture for AMP, Canvas, and Evergreen NextGen Medicube using React + TypeScript. Introduced AI driven development/testing workflows, improving delivery speed and code quality. Modernized legacy systems into a scalable React/Node.js platform with REST + GraphQL. Built Cypress based TDD pipelines, increasing reliability of governance critical data by 60%. Created the AMP Canvas Component Library (Material UI, SCSS, Storybook) to enforce accessibility and UI consistency.

Delivered custom data visualization components for complex regulatory workflows. Philosophie / Science37 — React Native Engineer

Jun 2021 – Jan 2022 Remote

Built a cross platform React Native iOS app enabling remote doctor–patient interactions for decentralized clinical trials.

Coeus Holdings — Senior Developer

Jan 2021 – Dec 2021 Remote

Delivered high reliability medical service sites with strict privacy and compliance requirements. Built scalable frontend solutions using modern JavaScript and WordPress Engine. WebMD — Senior Frontend Developer

Jan 2007 – Jan 2020 New York, NY

Built enterprise grade medical and pharmaceutical frontends using React, Node.js, and ES6. Led international expansion efforts, integrating localized regulatory requirements. Implemented CI/CD pipelines (Jenkins, Udeploy) for continuous delivery. Developed complex data driven visualizations for governance and reporting tools. Education

Purchase College, SUNY — BFA

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