Senior UI Developer

📍 Job Overview

Job Title: Senior UI Developer Company: LSEG Location: London, United Kingdom Job Type: FULL_TIME Category: Software Engineering / Frontend Development Date Posted: 2025-09-12 Experience Level: Mid-Senior Level (5-10 years implied) Remote Status: On-site

🚀 Role Summary

• Spearhead the design, development, and deployment of scalable, reliable, and secure React micro frontends within an AWS cloud environment.
• Drive UI delivery by leading the implementation of new requirements across a portfolio of over 20 existing micro frontend applications.
• Collaborate with cross-functional teams, including Business, Infrastructure, Support, Testing, and Operations, to ensure delivered functionality meets all stakeholder needs.
• Contribute to the continuous improvement of development processes and best practices within the UI community at LSEG, aligning with group UX standards.
• Take full ownership of the software delivery lifecycle for UI components, from initial requirement gathering through to production deployment and ongoing support.

📝 Enhancement Note: While this role is listed as "Senior UI Developer," the description heavily emphasizes experience with micro frontends, AWS deployment, and leading requirements, suggesting a strong operations-adjacent focus within the development lifecycle. The mention of "packaging" and "support" hints at responsibilities that extend beyond pure front-end coding into operational readiness and maintainability. The "5-10 years" implied experience level aligns with a senior individual contributor role with potential for technical leadership.

📈 Primary Responsibilities

• Architect, build, and maintain robust, responsive, and performant React-based micro frontends, ensuring seamless integration within the broader LCH Digital platform.
• Translate business requirements and user stories into technical specifications and actionable development tasks for the UI layer.
• Proactively identify and implement opportunities for technical backlog refinement, focusing on continuous improvement of existing services and application performance.
• Champion and implement CI/CD best practices for UI development, ensuring efficient and reliable deployment pipelines.
• Develop comprehensive unit and integration tests using Jest and Playwright to guarantee code quality, maintainability, and functional correctness.
• Participate in incident response, conduct thorough root cause analysis for UI-related issues, and implement effective corrective actions to ensure system stability.
• Engage with the wider LSEG UI community to share knowledge, contribute to design patterns, and ensure adherence to established UX and accessibility standards.
• Collaborate closely with backend development teams to define API contracts and ensure smooth data flow between services.

📝 Enhancement Note: The responsibilities highlight a blend of core development tasks with an emphasis on operational aspects like CI/CD, testing, incident response, and cross-functional collaboration, crucial for successful GTM (Go-To-Market) readiness of software features. The requirement to "package" applications points to a need to understand deployment processes and dependencies.

🎓 Skills & Qualifications

Education:

• Bachelor's degree in Computer Science, Engineering, or a related technical field, or equivalent practical experience.

Experience:

• 5-10 years of professional experience in front-end development with a strong focus on JavaScript and modern frameworks.
• Proven experience in designing and implementing micro frontend architectures.
• Demonstrable experience in deploying and managing applications within cloud environments, specifically AWS.

Required Skills:

• Deep Understanding of Frontend Architectures: Expertise in designing scalable Single Page Applications (SPAs) and micro frontend patterns.
• JavaScript/TypeScript Proficiency: Advanced skills in JavaScript and TypeScript, including functional programming paradigms.
• ReactJS Expertise: Extensive experience with React, including hooks, state management (e.g., Zustand), and related libraries (e.g., Yup, React hook forms).
• Build Tools & Bundlers: Strong command of build tools, particularly Webpack, for packaging and optimizing front-end applications.
• Automated Testing: Proficiency in writing and implementing comprehensive automated tests using frameworks like Jest and Playwright.
• Web Security Fundamentals: Knowledge of web security best practices, including authentication protocols like OAuth2.
• Problem-Solving & Analytical Skills: Demonstrated ability to diagnose and resolve complex technical issues effectively.
• Communication & Collaboration: Excellent verbal and written communication skills, with a proven ability to collaborate effectively within cross-functional teams.
• Proactive Learning: A genuine passion for learning new technologies and continuously improving development practices.

Preferred Skills:

• Experience with other JavaScript frameworks or libraries.
• Familiarity with cloud infrastructure services, particularly AWS components relevant to front-end hosting and deployment.
• Understanding of CI/CD pipelines and tools.
• Experience contributing to or maintaining shared component libraries.
• Familiarity with UX/UI design principles and best practices.

📝 Enhancement Note: The emphasis on "packaging," "AWS infrastructure," "automated testing," and "web security" points to an expectation for developers who understand the operational lifecycle of their code, not just its initial build. This is crucial for roles supporting GTM strategies where application stability and deployability are paramount.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Showcase a minimum of 2-3 significant projects demonstrating expertise in React and micro frontend architecture.
• Include examples of projects deployed to cloud environments (preferably AWS), highlighting the deployment process or architecture.
• Provide case studies detailing personal contributions to process optimization, workflow improvements, or efficiency gains within development projects.
• Demonstrate experience with CI/CD pipelines, including how automated testing and deployment were integrated.
• Highlight projects that showcase strong problem-solving skills and the resolution of complex technical challenges.

Process Documentation:

• Be prepared to discuss the processes followed for requirement gathering, technical design, development, testing, and deployment for projects in your portfolio.
• Demonstrate understanding of how you would approach designing and optimizing workflows for micro frontend development and integration.
• Be ready to explain how you measure and analyze the performance and efficiency of your code and applications post-deployment.

📝 Enhancement Note: For a Senior UI Developer role with operational considerations, a portfolio should not solely focus on aesthetics or UI features but also on the robustness, deployability, and maintainability of the code. Demonstrating an understanding of the end-to-end lifecycle, including deployment and testing, is key.

💵 Compensation & Benefits

Salary Range:

• Based on industry benchmarks for Senior UI Developers in London with 5-10 years of experience, specializing in React and micro frontends, the estimated salary range is £70,000 - £95,000 per annum. This estimate considers the cost of living in London and the demand for specialized skills in the financial technology sector.

Benefits:

• Comprehensive Healthcare coverage.
• Robust Retirement Planning options.
• Paid Volunteering Days, encouraging community engagement and corporate social responsibility.
• Access to Wellbeing Initiatives designed to support employee health and work-life balance.
• Opportunities for professional development and continuous learning.
• Exposure to cutting-edge financial technology and global markets.

Working Hours:

• Standard full-time working hours are implied, likely around 40 hours per week, with potential for flexibility in schedule arrangement, common in tech roles, but with an expectation of on-site presence.

📝 Enhancement Note: The salary range is an estimation based on the specified location (London, UK), experience level (Senior, 5-10 years implied), and the specialized skillset (React, Micro Frontends, AWS). LSEG is a major financial institution, which typically offers competitive compensation packages.

🎯 Team & Company Context

🏢 Company Culture

Industry: Financial Markets Infrastructure and Data Provider. LSEG operates within a highly regulated and dynamic global financial services sector, demanding high standards of reliability, security, and compliance. Company Size: 25,000+ employees across 65 countries. This indicates a large, established organization with significant resources, global reach, and established processes. Founded: While the exact founding date of LSEG as a whole is not provided, its constituent parts have long histories, signifying stability and deep industry expertise.

Team Structure:

• The role is within the LCH Digital platform team, likely a specialized group focused on the digital transformation and user experience of LCH (London Clearing House) services.
• The UI team is described as "small," suggesting a close-knit, agile environment where individual contributions have a significant impact.
• Reporting structure is not explicitly detailed but likely involves a lead developer or engineering manager within the digital platform.
• Cross-functional collaboration is a key aspect, involving close liaison with Business, Infrastructure, Support, Testing, and Operational teams, indicating a strong GTM and product-centric approach.

Methodology:

• Emphasis on designing, developing, packaging, and supporting scalable, reliable, and secure applications.
• Driving CI/CD best practices for UI development.
• Continuous improvement of ways of working and technical backlogs.
• Data-driven decision-making is implied given the company's industry and data focus.
• Agile methodologies are likely employed, given the mention of iterative development and backlog prioritization.

Company Website: https://www.lseg.com/

📝 Enhancement Note: LSEG's industry context implies a culture that values precision, security, and stability. The "digital platform" team likely operates with a focus on delivering robust, user-friendly interfaces that support critical financial operations, requiring a strong understanding of technical best practices and operational readiness. The company's values of Integrity, Partnership, Excellence, and Change will likely shape team dynamics and decision-making.

📈 Career & Growth Analysis

Operations Career Level: This role is positioned as a Senior UI Developer, implying a level of technical expertise and autonomy. It sits within the software development function but has strong ties to the operational readiness and delivery of digital platforms. The "lead UI delivery" aspect suggests potential for technical leadership or mentorship within the team.

Reporting Structure: The Senior UI Developer will likely report to a Digital Platform Lead or Engineering Manager. They will collaborate closely with product managers, business analysts, backend developers, QA engineers, and operations teams, providing a broad range of exposure within the product development lifecycle.

Operations Impact: The work directly impacts the usability and accessibility of LCH's digital platforms, which are critical for major financial institutions. Successful UI development and deployment contribute to operational efficiency for LSEG's clients and support the company's overall mission of driving financial stability and enabling sustainable growth. The role's success is measured not just by code quality but also by the seamless integration, reliability, and user adoption of the developed interfaces.

Growth Opportunities:

• Technical Specialization: Deepen expertise in React, micro frontend architectures, AWS cloud services, and CI/CD practices.
• Technical Leadership: Opportunity to lead UI delivery for specific features or applications, mentor junior developers, and influence technical direction.
• Cross-Functional Exposure: Gain broader understanding of financial markets, clearing functions, and the end-to-end software development lifecycle across various business units within LSEG.
• Process Improvement: Contribute to and drive improvements in development workflows, testing strategies, and deployment processes.
• Broader GTM Involvement: As the role involves close liaison with multiple teams, there's potential to become more involved in the go-to-market aspects of digital product launches.

📝 Enhancement Note: The growth trajectory for this role involves not only advancing technical UI skills but also developing an understanding of the operational and business context of financial technology, which is highly valuable for career progression in this sector.

🌐 Work Environment

Office Type: The role is specified as "On-site," indicating a traditional office-based work environment. LSEG is a large financial institution, so the office is likely a professional, corporate setting. Office Location(s): London, United Kingdom. London is a major global financial hub, offering excellent connectivity and a vibrant professional ecosystem.

Workspace Context:

• Collaborative Environment: The emphasis on liaising with multiple teams (Business, Infrastructure, Support, Testing, Operations) suggests a highly collaborative workspace where teamwork and communication are paramount.
• Tools & Technology: Expect access to modern development tools, robust IT infrastructure, and potentially high-performance computing resources necessary for financial data processing and development.
• Team Interaction: Opportunities for regular interaction with fellow UI developers, backend engineers, product managers, and other stakeholders to discuss technical challenges and project progress.

Work Schedule:

• Standard full-time hours (likely 40 hours/week) are expected, with the "On-site" designation implying regular attendance at the London office. While not explicitly stated, tech roles within large firms often offer some degree of flexibility in daily start/end times, provided core hours and project deliverables are met.

📝 Enhancement Note: The on-site requirement in a major financial center like London suggests a professional, structured work environment where collaboration and adherence to company protocols are important. This setting is conducive to the operational aspects of development, such as seamless team communication and access to necessary infrastructure.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: HR or recruiter call to assess basic qualifications, experience, and cultural fit.
• Technical Interview(s): Likely includes discussions on JavaScript, React, micro frontends, AWS, testing strategies, and problem-solving scenarios. Expect coding challenges or live coding sessions.
• Portfolio Review: Candidates will be expected to present and discuss their portfolio, focusing on specific projects, their role, technical challenges, and solutions implemented. This is where showcasing process understanding and operational considerations will be key.
• Team/Hiring Manager Interview: Deeper dive into experience, leadership potential, collaboration style, and alignment with team and company values.
• Final Interview: May involve senior leadership or cross-functional stakeholders to ensure alignment and assess strategic thinking.

Portfolio Review Tips:

• Structure Your Projects: For each project, clearly outline the problem statement, your specific contributions, the technologies used, the architectural decisions made, and the outcomes achieved.
• Highlight Process & Operations: Emphasize the development lifecycle, testing methodologies (Jest, Playwright), CI/CD implementation, and any deployment/packaging considerations. Discuss how you ensured code quality, reliability, and maintainability.
• Showcase Problem-Solving: Prepare to discuss complex technical challenges faced and how you approached their resolution, demonstrating analytical and problem-solving skills.
• Quantify Impact: Whenever possible, use metrics to demonstrate the impact of your work, such as improvements in performance, reduction in bugs, or successful feature delivery timelines.
• Be Prepared for AWS Discussion: If your projects involved AWS, be ready to discuss relevant services and your role in the deployment or management process.

Challenge Preparation:

• Coding Exercises: Practice common JavaScript/React coding challenges, focusing on algorithm efficiency and best practices.
• System Design: Be prepared for questions about designing scalable frontend architectures, specifically in a micro frontend context.
• Scenario-Based Questions: Think about how you would handle common development scenarios, such as debugging production issues, collaborating with difficult stakeholders, or prioritizing technical debt.
• CI/CD & Testing: Review your knowledge of CI/CD principles and automated testing frameworks.

📝 Enhancement Note: A strong portfolio for this role should demonstrate not just coding prowess but also an understanding of the operational aspects of software development—how to build, test, deploy, and maintain applications reliably. The interview process will likely probe these areas extensively.

🛠 Tools & Technology Stack

Primary Tools:

• JavaScript/TypeScript: Core language for development.
• ReactJS: Primary framework for building user interfaces.
• Webpack: Essential for bundling, packaging, and optimizing front-end assets.
• React Hooks: Standard for managing state and side effects in React components.
• State Management: Libraries like Zustand are mentioned, indicating a need for efficient state management solutions.
• Form Libraries: Yup and React hook forms suggest a need for robust form handling and validation.

Analytics & Reporting:

• Jest: For unit testing and integration testing of JavaScript code.
• Playwright: For end-to-end automated testing of web applications.
• AWS Infrastructure: Expected to have familiarity with AWS services for deployment and potentially monitoring, though specific services are not listed.

CRM & Automation:

• While not directly a CRM role, understanding how frontends interact with backend services and APIs is crucial. Familiarity with RESTful APIs and potentially GraphQL would be beneficial.
• CI/CD Tools: Implicitly required for driving CI/CD best practices (e.g., Jenkins, GitLab CI, GitHub Actions).

📝 Enhancement Note: The explicit mention of Webpack highlights the "packaging" aspect of the role, which is directly related to the operational readiness and deployment of the front-end applications. Proficiency in testing tools like Jest and Playwright is also key for ensuring application stability and reducing operational overhead.

👥 Team Culture & Values

Operations Values:

• Integrity: Upholding ethical standards and ensuring the reliability and security of financial systems.
• Partnership: Collaborating effectively with diverse teams (business, infrastructure, support, testing, operations) to achieve shared goals.
• Excellence: Striving for high quality in code, processes, and user experience, with a focus on performance and robustness.
• Change: Embracing new technologies, methodologies, and continuous improvement to adapt to evolving market needs and technological advancements.

Collaboration Style:

• Cross-functional Integration: Expect to work closely with various departments, requiring strong communication and ability to translate technical concepts for non-technical audiences.
• Process Review & Feedback: A culture that encourages open discussion about development processes, code reviews, and feedback exchange to drive continuous improvement.
• Knowledge Sharing: Encouragement to share learnings, best practices, and insights within the UI community and broader engineering teams.

📝 Enhancement Note: The company values directly inform the expected collaboration style and approach to problem-solving. For operations-minded professionals, demonstrating alignment with these values—particularly "Excellence" in delivery and "Change" in adopting better practices—will be crucial.

⚡ Challenges & Growth Opportunities

Challenges:

• Leading UI Delivery: Taking ownership of requirements across a large number of existing micro frontend apps requires strong organizational and prioritization skills.
• Technical Debt Management: Improving existing services implies dealing with and potentially refactoring legacy code or suboptimal implementations.
• Cross-Team Dependencies: Successfully coordinating with numerous external teams (Business, Infrastructure, Support, Testing, Ops) for seamless delivery can be complex.
• Evolving Technology Landscape: Staying abreast of new frontend technologies and best practices while maintaining stability in a regulated financial environment.

Learning & Development Opportunities:

• Operations-Focused Skill Advancement: Deepen expertise in CI/CD, automated testing, cloud deployment (AWS), and application monitoring.
• Industry Exposure: Gain in-depth knowledge of financial markets infrastructure (clearing functions) and how technology supports these critical operations.
• Mentorship: Opportunity to mentor junior developers on the team and learn from senior engineers and architects at LSEG.
• Professional Certifications: Potential to pursue certifications in cloud technologies (AWS) or agile methodologies.

📝 Enhancement Note: This role presents a unique opportunity to blend deep technical UI skills with an understanding of operational requirements critical to the financial services industry. Overcoming the challenges directly translates into valuable experience for a career in operations-focused technology roles.

💡 Interview Preparation

Strategy Questions:

• Micro Frontend Strategy: "Describe your approach to designing and managing a portfolio of over 20 micro frontend applications. How would you ensure consistency, maintainability, and efficient delivery across them?" (Focus on shared libraries, communication protocols, versioning, and deployment strategies).
• Cross-Functional Collaboration: "How would you collaborate with Business, Infrastructure, and Operations teams to ensure a new UI feature is not only functionally correct but also operationally sound and meets deployment requirements?" (Emphasize clear communication, proactive engagement, and understanding of operational constraints).
• Problem-Solving & Process Improvement: "Walk me through a time you identified a bottleneck or inefficiency in a UI development process. What steps did you take to address it, and what was the outcome?" (Showcase analytical skills, initiative, and understanding of process optimization).

Company & Culture Questions:

• LSEG Values: "How do LSEG's values of Integrity, Partnership, Excellence, and Change align with your personal work philosophy and how you approach software development?" (Research the company values and prepare examples).
• Team Dynamics: "Describe your ideal collaboration style within a small, impactful team. How do you contribute to a positive and productive team environment?" (Highlight your teamwork, communication, and proactivity).
• Impact Measurement: "How do you measure the success of your UI development work beyond just code completion? How do you ensure your applications have a positive impact on users and business operations?" (Focus on user feedback, performance metrics, and contribution to business goals).

Portfolio Presentation Strategy:

• Narrative Flow: Structure your presentation around the "story" of each project: the problem, your solution, the technical details, and the results.
• Demonstrate Process: Clearly articulate the development and testing processes you followed. Show how you used tools like Webpack for packaging and Jest/Playwright for testing.
• Quantify Results: Use data and metrics to showcase the impact of your work (e.g., performance improvements, bug reduction, successful feature launches).
• Highlight Operational Readiness: Explain how your work ensured the application was deployable, maintainable, and secure, referencing specific practices or tools.
• Be Prepared for Deep Dives: Anticipate detailed questions about specific code implementations, architectural choices, and problem-solving approaches.

📝 Enhancement Note: The interview preparation should focus on demonstrating not only technical proficiency in React and micro frontends but also a strong understanding of the operational lifecycle of software, including testing, deployment, and collaboration with operational teams.

📌 Application Steps

To apply for this operations-adjacent development position:

• Submit your application through the provided Workday link, ensuring your resume is up-to-date and highlights relevant experience.
• Portfolio Customization: Curate your portfolio to specifically showcase your experience with React, micro frontends, Webpack, AWS deployment, and automated testing (Jest/Playwright). Prepare 2-3 key projects that best represent these skills and your process-driven approach.
• Resume Optimization: Tailor your resume to include keywords from the job description such as "micro frontends," "React," "Webpack," "AWS," "CI/CD," "automated testing," and "functional programming." Quantify achievements with metrics where possible.
• Interview Preparation: Practice articulating your experience with process optimization, cross-functional collaboration, and the operational aspects of UI development. Prepare to walk through your portfolio projects in detail, focusing on challenges, solutions, and outcomes.
• Company Research: Familiarize yourself with LSEG's mission, values, and the financial services industry. Understand the importance of reliability, security, and efficiency in this context, and how your role contributes to these objectives.

⚠️ Important Notice: This enhanced job description includes AI-generated insights and operations industry-standard assumptions. All details should be verified directly with the hiring organization before making application decisions.