Principal Web Developer

Comcast • Philadelphia, PA

4d

About The Position

We are seeking a Principal Web Developer with deep industry expertise and exceptional hands-on experience building large-scale, high-performance web applications using modern JavaScript frameworks. This leader will shape the technical direction for our web ecosystem, drive architectural excellence, and elevate engineering standards across multiple teams. The ideal candidate combines strong system-level thinking, hands-on engineering excellence, and deep experience building dynamic, personalized digital experiences powered by modern CMS platforms.

Requirements

• Technical Expertise Deep mastery of JavaScript and TypeScript, with hands-on experience in React (preferred) and other leading frameworks.
• Extensive experience implementing and scaling web applications integrated with modern CMS platforms (headless or traditional).
• Strong understanding of personalization frameworks, A/B testing platforms, and dynamic content delivery patterns.
• Expertise with large-scale frontend architectures, state management, caching, and performance optimization.
• Solid knowledge of backend concepts, microservices, and API integrations.
• Strong experience with modern testing frameworks, CI/CD pipelines, and automation tooling.
• Deep understanding of accessibility, web security, and SEO/performance best practices.
• Leadership & Professional Skills Demonstrated success leading engineering teams and influencing technology roadmaps.
• Excellent communication skills with the ability to simplify complex concepts.
• Strong problem-solving and analytical thinking skills.
• Collaborative mindset with proven experience mentoring and developing engineering talent.

Nice To Haves

• Bachelor’s or Master’s degree in Computer Science, Engineering, or related field.
• 10+ years of experience developing large-scale web applications.
• Experience building enterprise-grade digital experiences with personalization at scale.
• Familiarity with Agile/Lean methodologies.

Responsibilities

• Architectural Leadership & Technical Strategy Define and evolve the technical vision for our web platforms, ensuring scalability, performance, security, and maintainability.
• Architect complex frontend applications using React, Angular, Vue, or comparable JavaScript frameworks.
• Lead solution design for highly dynamic, content-driven experiences, including CMS-managed and personalized content.
• Evaluate emerging technologies, frameworks, and tools to continually improve our digital experience capabilities.
• Expert Hands-On Web Development Serve as the technical authority on JavaScript, TypeScript, and related frontend technologies.
• Develop high-performance, accessible, and responsive UI experiences across devices.
• Optimize application architecture, state management, rendering performance, and frontend build pipelines.
• Implement personalized content delivery and customer-specific experiences using CMS capabilities, rules engines, and API-driven content models.
• Partner with backend and platform teams to design efficient, scalable API contracts for content delivery.
• CMS & Personalization Expertise Integrate modern headless or hybrid CMS platforms into large-scale web applications (e.g., Adobe Experience Manager, Contentful, Sitecore, Optimizely, etc.).
• Architect component-driven UI models that seamlessly connect with structured CMS content.
• Implement personalization strategies including A/B testing, audience targeting, journey orchestration, and content rules.
• Guide content modeling, authoring workflows, and reusable content patterns for scalability and ease of maintenance.
• Collaborate closely with marketing, content authors, and UX teams to enable frictionless content publishing and optimization workflows.
• Technical Leadership & Mentorship Mentor senior engineers and guide technical teams in executing complex engineering initiatives.
• Lead code reviews, architecture reviews, and technical deep dives.
• Foster a culture of innovation, performance excellence, and continuous learning.
• Cross-Functional Partnership Collaborate with Product, UX, Content Strategy, and Architecture teams to translate business requirements into technical solutions.
• Lead technical planning, sizing, and risk assessment for major initiatives.
• Serve as a thought leader on modern web architectures and digital experience platforms.
• Delivery & Execution Excellence Oversee end-to-end delivery of large, CMS-driven, and personalized web experiences.
• Drive adoption of engineering best practices including modular architecture, automated testing, CI/CD, and observability.
• Troubleshoot and resolve complex production issues with a strong focus on performance and reliability.

Benefits

• We believe that benefits should connect you to the support you need when it matters most, and should help you care for those who matter most. That's why we provide an array of options, expert guidance and always-on tools that are personalized to meet the needs of your reality—to help support you physically, financially and emotionally through the big milestones and in your everyday life.
• Please visit the benefits summary on our careers site for more details.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Number of Employees: 5,001-10,000 employees