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Senior Frontend Engineer - ReactJS United Kingdom Jobs

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Senior AI Frontend Engineer (Developer Productivity)
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Join Citi in Belfast as a Senior AI Frontend Engineer. Leverage your deep React/TypeScript expertise to build the UI for a next-gen AI Developer Productivity platform. You'll transform cutting-edge Generative AI into intuitive experiences for 50,000+ global engineers. Enjoy top benefits including...
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United Kingdom , Belfast
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Citi
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Until further notice
Senior Frontend Software Engineer
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Join Atlassian in London as a Senior Frontend Software Engineer. You will build and modernize frontend infrastructure using React, JavaScript (ES6), and modern testing frameworks. Drive complex projects, mentor junior engineers, and deliver impactful user experiences. Enjoy benefits including hea...
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United Kingdom , London
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Atlassian
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Senior Frontend Software Engineer
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Join Addepar's high-impact Partner Platform team in Edinburgh as a Senior Frontend Software Engineer. You'll architect scalable solutions on a data lakehouse, integrating diverse data sources and enabling powerful analytics. This role requires strong frontend skills, backend experience (Python/Ja...
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United Kingdom , Edinburgh
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Addepar
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Senior Frontend Software Engineer
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Join Blis in Edinburgh as a Senior Frontend Engineer. You will build customer-facing web apps for complex ad campaigns using React, TypeScript, and modern tooling. Leverage 7+ years of experience to create beautiful data visualizations from geospatial and big data. This is a key role in a tech-fi...
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United Kingdom , Edinburgh
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Blis
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Senior Frontend Engineer
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Join a leading London financial services firm as a Senior Frontend Engineer. You will build low-latency, real-time UIs with React and TypeScript, transforming vast datasets into intuitive experiences. This role requires strong performance optimisation skills and offers a bonus, learning budgets, ...
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United Kingdom , London
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150000.00 GBP / Year
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Orbis Consultants
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Senior Frontend Engineer
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Join a leading London energy trading firm as a Senior Frontend Engineer. Develop high-performance, real-time React/TypeScript interfaces for critical trading platforms. This role offers a £150k base salary plus bonus, focusing on scalable UI for data-intensive decision-making. Strong modern JavaS...
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United Kingdom , London
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150000.00 GBP / Year
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Orbis Consultants
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Senior Frontend Platform Engineer
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Join our Frontend Tech platform team in London as a Senior Frontend Platform Engineer. You will modernize our stack with React, shape frontend architecture, and build tools for product teams. We seek 5+ years of React expertise and a passion for enabling other engineers. Enjoy competitive salary,...
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United Kingdom , London
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Intercom
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Senior Frontend Engineer
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Join our London team as a Senior Frontend Engineer. You will design and build complex, scalable frontend systems using React, taking ownership from concept to deployment. We seek a highly driven expert with deep technical skills and a proven impact record. Enjoy an L&D budget to accelerate your g...
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United Kingdom , London
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AlphaSights
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Senior Frontend Engineer - ReactJS Jobs: A Comprehensive Career Overview A Senior Frontend Engineer specializing in ReactJS is a pivotal role in modern software development, focused on crafting the user-facing layer of web applications with expertise in the React library. These professionals are responsible for transforming complex business logic and design visions into fast, intuitive, and visually compelling digital experiences. Beyond simply writing code, they are architects of user interaction, ensuring applications are robust, scalable, and maintainable. For those exploring Senior Frontend Engineer - ReactJS jobs, this role represents a blend of deep technical mastery, strategic thinking, and leadership within engineering teams. The typical day-to-day responsibilities for someone in this senior position are extensive. Core duties include designing and developing complex user interfaces using React, TypeScript, and modern JavaScript (ES6+). They build reusable components and frontend libraries for future use, establishing patterns that elevate the entire codebase. A significant part of the role involves performance optimization, ensuring applications render quickly and respond smoothly to user input. Senior engineers are also deeply involved in state management using tools like Redux or Context API, routing, and integrating frontend applications with backend services via APIs. They champion code quality by writing comprehensive unit, integration, and end-to-end tests using frameworks like Jest and React Testing Library. Furthermore, they actively participate in code reviews, provide technical mentorship to junior and mid-level engineers, and collaborate closely with product managers, designers, and backend engineers to define project scope and technical feasibility. The skill set required for these jobs is both broad and deep. Mastery of React fundamentals—including hooks, component lifecycle, virtual DOM, and advanced patterns—is non-negotiable. Proficiency in TypeScript is increasingly standard for ensuring type safety and developer efficiency. A strong understanding of modern CSS, HTML5, and responsive design principles is essential. Senior engineers are expected to have experience with frontend build tools and pipelines (Webpack, Vite), version control (Git), and modern development practices like CI/CD. Crucially, soft skills are paramount: excellent problem-solving abilities, a proactive ownership mindset, and outstanding communication skills to articulate technical decisions to both technical and non-technical stakeholders. A typical requirement for Senior Frontend Engineer - ReactJS jobs is 5+ years of professional frontend development experience, with a substantial portion dedicated to React in production environments. Ultimately, professionals in these jobs act as force multipliers for their teams. They not only solve immediate technical challenges but also shape the frontend architecture, improve developer tooling and experience, and drive long-term technical strategy. They balance building for today's needs with designing for tomorrow's growth, making them indispensable in creating the sophisticated, dynamic web applications that users love. For engineers seeking a role with high impact, continuous learning, and leadership, pursuing Senior Frontend Engineer - ReactJS jobs is a compelling career path at the forefront of digital innovation.

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