Top Front End Developer Jobs in Philadelphia, PA

Lead architecture and delivery of large-scale React and React Native frontends. Define frontend strategy and best practices, build shared component libraries and design systems, optimize performance and accessibility, collaborate with product/design/backend teams, mentor junior engineers, and resolve complex frontend and cross-stack issues.

Architect and build a high-performance, low-latency trading web platform. Integrate real-time market data and execution workflows, collaborate cross-functionally on large initiatives, and deliver scalable, performant, user-focused frontend applications with strong attention to API design, tooling, and developer experience.

Develop innovative UI and web systems, managing project priorities and deadlines while working within a collaborative team environment.

Design and implement frontend applications using JS, CSS, React, and Flutter. Collaborate on technical specs and contribute to documentation, ensuring user experience and performance.

Build and own complex frontend features using Vue 3 and TypeScript while developing the Python services and APIs that power them. Improve performance, accessibility, testing, CI/CD, and observability; collaborate with product and design; mentor engineers and apply AI-assisted development tools responsibly to accelerate productivity and maintain quality and security.

Design, develop, and enhance custom SAP Fiori/UI5 applications; configure Fiori Launchpad; integrate OData services; perform UI debugging, performance optimization, code reviews, unit testing, and documentation while collaborating with backend and functional teams.

Design, build, and deliver front-end features with strong UX focus. Own technical design, coding, testing, deployment, and monitoring in a continuous delivery, microservices environment. Collaborate with Product, implement automated QA practices, and contribute to production deployments while practicing robust testing methodologies.

Own end-to-end frontend development for core crypto payment flows across web and mobile. Improve latency, availability, and SLOs; build user-facing features (contacts, real-time transaction status); identify and fix performance bottlenecks; partner with product/design/backend; mentor junior engineers to reduce customer friction at scale.

Lead architecture and development of a high-performance, responsive trading web app using React/Next.js/TypeScript. Own features, optimize performance (mobile-focused), integrate real-time data/WebSockets, maintain clean code, and collaborate with founders and cross-functional teams to drive product decisions.

Develop and maintain WordPress websites, create custom themes and plugins, ensure cross-browser compatibility, and optimize for SEO. Provide guidance on user experience and explore new technologies.

Develop user-facing features using Vue.js, collaborate with back-end engineers, optimize performance, maintain code quality, and stay updated on blockchain trends.

The Staff Frontend Engineer will develop shared frontend libraries, enhance performance, and manage a design system to improve user experiences.

The Front-End Engineer will develop and optimize production React applications, collaborating with cross-functional teams to deliver high-quality UIs and maintain component libraries.

You will drive the product's frontend look and feel, build UIs for complex data, ensure consistent designs, and enhance development velocity. This role requires strong React/TypeScript skills, a builder's mindset, and a focus on performance and design sensibility.

The Front-End Developer will create user interfaces using Vue.js, optimize application performance, collaborate with teams, and maintain code quality through testing and reviews.

Build, test, and optimize responsive web applications using Next.js and React. Collaborate with designers and back-end developers, implement UI/UX designs, write clean maintainable code, and debug front-end issues to ensure high performance across devices and browsers.

Build and maintain responsive, accessible React/NextJS web interfaces and support Chrome extension development (Manifest V3). Integrate with backend APIs or WebSockets, optimize performance, write tests, perform code reviews, monitor and document extension and web app behavior, and collaborate with cross-functional teams.

The Front-End Developer will create and maintain web applications using HTML, CSS, and JavaScript, focusing on automation and software delivery processes.

The Front End Developer will create and manage web design and digital marketing projects, requiring proficiency in HTML, CSS, and JS; experience with client interaction and ecommerce platforms is a plus.

Build front-end features for Backpack Exchange, optimize performance, and manage projects from start to finish with a focus on React.

Build pixel-accurate, accessible, responsive interfaces from Figma using handcrafted CSS/SCSS and modern layout primitives. Implement interactive UI in Vanilla JavaScript and React/Next, integrate front-end with CMSs (Contentful, Drupal, WordPress), use modern build tooling, participate in code reviews, and leverage AI tools to speed debugging and scaffolding.

The Senior Software Engineer will focus on frontend technology, implement features, mentor engineers, and ensure quality user experiences, primarily using React.

Assist with marketing campaigns including website, landing page, email, and report design. Take ownership of projects, iterate quickly in a startup environment, apply front-end skills (HTML/CSS/C#/WordPress/PHP), and collaborate across the small team. Opportunity may convert to full-time.

Develop mobile-first, responsive Vue.js frontends focused on performance and UX. Build frontend management systems, participate in code reviews and team ceremonies, mentor junior engineers, and collaborate with backend teams.

As a Front-End Developer Intern, you will design and build web applications, collaborate with teams, participate in code reviews, and maintain code quality.