Top Front End Developer Jobs in Philadelphia, PA

As a Staff Front End Engineer, you will lead the front end vision, drive architecture decisions, and mentor engineers while developing high-impact web applications in a collaborative environment.

The Frontend Engineer will implement UI features, automate UI testing, and oversee production releases while focusing on user experience in the blockchain space.

Design, build, and maintain high-performance Next.js + TypeScript front-end applications. Implement responsive, accessible UIs, optimize rendering and bundle size, integrate with REST and WebSocket APIs, contribute to back-end work as needed, uphold testing and documentation standards, and mentor junior engineers.

Build responsive, production-grade web UIs and data-dense dashboards from design prototypes. Implement interactive visualizations, integrate with REST/GraphQL backends, manage state and performance, write frontend tests, and collaborate with designers, backend and data engineers to deliver polished, accessible, and performant cybersecurity and analytics products.

Design and implement developer-facing UI from Figma to production using Hotwire (Turbo + Stimulus) and ViewComponents. Own the dashboard, API playgrounds, docs, marketing site, and data visualization. Optimize performance and bundle size, maintain a coherent component system, and ship polished, production-ready front-end with tests and CI/CD.

Design, deploy, and test modular front-end user interfaces; gather user requirements via customer working groups and wireframes; coordinate with backend developers; create end-to-end tests and participate in usability events to validate UI functionality within mission software deployments.

The Sr/Staff Frontend Engineer will develop new web applications, enhance UI experiences, architect solutions, and collaborate with various stakeholders to ensure a scalable and secure platform.

This role involves leading web platform initiatives, mentoring senior engineers, architecting web applications, and implementing technical strategies for improved performance.

The Frontend Engineer will develop high-performance trading UIs for a decentralized exchange platform, manage state across various blockchains, and implement reliable transaction handling features.

The role involves designing and building internal web applications for Nebius, focusing on automating data center operations and developing user interfaces for infrastructure management.

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.

The Frontend Engineer will collaborate with design and product teams to create responsive user interfaces, write maintainable code, and optimize performance for a financial platform.

Design and build a scalable, responsive UI; lead frontend architecture and optimization; apply UI/UX best practices; integrate with backend APIs; ensure high web performance and deploy user-facing features.

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 role involves developing large-scale applications using HTML, CSS, JavaScript, and React/WordPress, code reviews, and crafting UI components while ensuring high quality and accessibility.

Own and evolve Roo's frontend platform: design system, shared UI architecture, developer tooling, and AI-assisted workflows. Lead migrations, React/React Native modernization, Expo adoption, and developer experience improvements. Partner with Product and Design to make components effortless to consume by engineers, designers, and AI agents, and remove platform friction to increase engineering velocity.

Join a remote team to enhance web functionality for e-commerce brands through Shopify, data management, and rapid technical support in a growth-driven environment.

Join a remote team as a Front End Web Developer, focusing on SEO implementation and web enhancements on client websites for improved performance.

Lead the development of a scalable frontend web application for an AI photo platform, recommend technologies, and ensure performance optimization.

The role involves building creative tools for content editing, enhancing features with PixiJS and WebGL, and improving collaboration workflows.

Build and maintain performant frontend components and pages using React and Next.js; consume GraphQL APIs via Apollo; implement accessible reusable UI aligned to Yahoo UDS; write tests and support CI/CD; optimize frontend performance; own features end-to-end and collaborate with backend, design, and product teams.

Design user interfaces and workflows in Figma, implement designs using Vue.js and Next.js, and collaborate with backend engineers on API integration.

Build and maintain scalable, high-performance web applications and data-visualization platforms using React, Redux, Vite, and TypeScript. Collaborate with cross-functional teams to design features, write clean code and tests, debug, contribute to APIs, mentor junior engineers, and apply modern development practices including CI/CD and accessibility considerations.

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.