Lead Engineer UI

The Design Project; Greater London; Hybrid; GBP 80,000 - GBP 120,000; Full time

Job summary

A leading financial services firm is seeking a Lead Engineer - UI to design and develop sophisticated front-end solutions for eTrading platforms. The role, based in London, involves providing technical leadership, mentoring teams, and ensuring compliance with governance standards. Candidates should have extensive experience with Angular, TypeScript, and real-time communication technologies. The position offers a hybrid work model and competitive compensation ranging from £80,000 - £120,000, reflecting the seniority and technical expertise required.

Benefits

27 days annual leave

Discretionary annual performance-related bonus

Private Medical Care & Life Insurance

Employee Assistance Program

Pension Plan

Special discounts for employees

Qualifications

• Extensive proven experience in designing, building, testing, maintaining, and supporting large-scale, high-performance UI applications.
• Thorough understanding of real-time communication between UI and backend systems using HTTP and Web Sockets.
• Deep understanding of Reactive programming paradigms, specifically RxJS and NgRx.

Responsibilities

• Lead the design, development, testing, and maintenance of sophisticated user interfaces for eTrading and Algo trading platforms.
• Provide technical oversight and mentorship across multiple applications development areas.
• Support and enhance the existing infrastructure and applications, potentially involving .Net and WPF technologies.

Skills

Angular

TypeScript

Design and development of high-performance UI applications

Real-time communication

Reactive programming (RxJS, NgRx)

CI/CD practices

Interpersonal skills

Problem-solving skills

Education

Bachelor’s degree or equivalent practical experience

Master’s degree preferred

Tools

TeamCity

Jenkins

.Net

WPF

Job description

Job Title: Lead Engineer - UICompany: CitiLocation: London, United KingdomJob Type: Full-timeCategory: Application Development / TechnologyDate Posted: January 16, 2026Experience Level: Mid-Senior Level (Implied 5-10 years)Remote Status: Hybrid (Up to 2 days working at home per week)

• Design and develop cutting-edge front-end solutions for high-frequency electronic trading (eTrading) and algorithmic trading platforms.
• Provide technical leadership and architectural guidance for UI applications within the Fixed Income eTrading team, ensuring robust and scalable solutions.
• Drive engineering excellence by adhering to application development life cycles, implementing best practices, and balancing rapid client delivery with stringent governance and compliance.
• Enhance and support existing infrastructure and applications, leveraging expertise in modern UI technologies and distributed systems.
• Collaborate closely with Technology and Product teams to deliver business value and maintain a competitive edge in global financial markets.

📝 Enhancement Note: The role is explicitly for a "Lead Engineer - UI" within Citi's Fixed Income eTrading team, focusing on front-end development for complex trading platforms. This implies a need for deep technical expertise in UI technologies, a strong understanding of financial markets and trading systems, and the ability to lead technical initiatives. The "Lead" title suggests a senior individual contributor role with significant influence on technical direction and execution, rather than a direct people management role.

📈 Primary Responsibilities

• Lead the design, development, testing, and maintenance of sophisticated user interfaces for eTrading and Algo trading platforms, utilizing Angular, Typescript, HTML, and CSS.
• Provide technical oversight and mentorship across multiple applications development areas, ensuring consistency and high performance of global eTrading and Algo platforms.
• Support and enhance the existing infrastructure and applications, potentially involving .Net and WPF technologies alongside core Angular/Typescript development.
• Champion and implement robust application development life cycle processes, driving engineering excellence and ensuring adherence to coding standards and best practices.
• Collaborate with cross-functional teams, including Product Management, Quants, and Backend Engineering, to translate business requirements into technical solutions that meet market connectivity, price distribution, and order management needs.
• Ensure all developed solutions comply with global governance, regulatory, and audit mandates, balancing speed-to-market with robust risk management.
• Troubleshoot and resolve complex technical issues in real-time trading environments, minimizing downtime and impact on business operations.
• Contribute to the continuous improvement of CI/CD pipelines (e.g., TeamCity, Jenkins) in cloud-native environments to streamline deployment processes.
• Implement styles based on UX designs, ensuring a user-friendly and intuitive experience for traders and other end-users.

📝 Enhancement Note: Responsibilities are derived from the job description's emphasis on "design & development of Front end for eTrading and Algo platforms," "technical oversight," "supporting and enhancing existing infrastructure," and "follow application development life cycle and drive engineering excellence." The inclusion of "eTrading strategy & provides market connectivity, price distribution, order management, RFQ management, Algo trading capability for Spread Products business" strongly suggests a focus on high-performance, low-latency applications critical to financial trading operations.

🎓 Skills & Qualifications

Education:

• Bachelor’s degree or equivalent practical experience is required.
• Master’s degree is preferred.

Experience:

• Extensive proven experience in designing, building, testing, maintaining, and supporting large-scale, high-performance UI applications.

Required Skills:

• Thorough understanding of real-time communication between UI and backend systems using HTTP and Web Sockets.
• Deep understanding of Reactive programming paradigms, specifically RxJS and NgRx.
• Strong experience in distributed applications and architecture design.
• Expertise in UI application design, development, performance tuning, and troubleshooting.
• Hands-on experience with CI/CD pipelines using tools like TeamCity or Jenkins in Cloud Native environments.
• Ability to implement styles accurately based on UX designs.
• Excellent interpersonal, communication, and problem-solving skills.
• Demonstrated innovative mindset, driving the adoption of new approaches, solutions, and tools.

Preferred Skills:

• Previous experience in delivering electronic trading solutions.
• Previous experience in the financial industry, with knowledge of Spread Products (e.g., Bonds, Loans, CDS/CDX & Index Tranches).
• Experience with .Net and WPF technologies.
• Demonstrated ability to learn new business concepts and technologies quickly and thoroughly.
• Experience in following good development standards and practices.

📝 Enhancement Note: The skills section is a direct compilation of the "Qualifications" and "Knowledge and Experience" sections from the job description, with emphasis on the core UI technologies (Angular, Typescript) and preferred financial industry/trading experience. The "Lead Engineer" title implies a level of expertise and problem-solving capability beyond junior roles.

• Demonstrations of large-scale, high-performance UI applications designed and built from the ground up.
• Case studies showcasing expertise in Angular, TypeScript, HTML, and CSS, with clear explanations of architectural decisions.
• Examples of real-time communication implementations between UI and backend systems (e.g., via Web Sockets).
• Documentation or examples illustrating the application of Reactive programming paradigms (RxJS, NgRx).
• Evidence of performance tuning and troubleshooting efforts for complex UI applications, including metrics on improvements.
• Examples of CI/CD pipeline integration (TeamCity, Jenkins) for UI development in cloud-native environments.
• Prototypes or designs demonstrating the ability to translate UX designs into functional interfaces.

Process Documentation:

• Detailed explanations of the application development life cycle followed for past projects, emphasizing engineering excellence.
• Workflow diagrams or descriptions of how CI/CD processes were implemented and optimized for UI development.
• Documentation on how real-time communication protocols were integrated and managed.
• Examples of how reactive programming patterns were applied to manage application state and data flow.
• Case studies detailing the process of troubleshooting and performance tuning in a high-stakes environment.

📝 Enhancement Note: Given this is a Lead Engineer role in a trading environment, a portfolio is crucial. The requirements are inferred from the "Responsibilities" and "Qualifications" sections, focusing on tangible evidence of skills in UI development, performance, real-time systems, and modern development practices like CI/CD and reactive programming. The emphasis is on demonstrating how these skills were applied to solve complex problems, particularly within a financial services context.

Salary Range:Based on industry benchmarks for a Lead Engineer - UI in London with the described experience and responsibilities at a major financial institution like Citi, the estimated annual salary range is £80,000 - £120,000. This range accounts for the seniority of the role, the highly specialized technical skills required, and the demands of working within a high-frequency trading environment.

• 27 days annual leave (plus bank holidays)
• Discretionary annual performance-related bonus
• Private Medical Care & Life Insurance
• Employee Assistance Program
• Pension Plan
• Special discounts for employees, family, and friends
• Access to extensive learning and development resources
• Hybrid working model (up to 2 days working at home per week)

Working Hours:

• Standard working hours are implied to be aligned with typical financial industry expectations, likely around 40 hours per week. The hybrid model offers flexibility.

📝 Enhancement Note: The salary range is an estimation based on publicly available data for Lead UI Engineers in London in the financial services sector, considering the specified responsibilities and required skills. The benefits are directly extracted from the job description. The "Full time" employment type and the mention of a hybrid model inform the working hours and arrangement.

Industry: Financial Services (Banking & Technology)Company Size: Citi is a global financial services corporation with tens of thousands of employees worldwide, indicating a large, established organization with significant resources and complex internal structures.Founded: 1812, providing a long history and deep-rooted presence in the financial industry.

Team Structure:

• The role is within the Fixed Income eTrading team, which is part of the broader Technology department at Citi.
• This team is responsible for delivering eTrading strategy, market connectivity, price distribution, order management, and algorithmic trading capabilities for Spread Products.
• The Lead Engineer - UI will likely report to an Engineering Manager or Head of Application Development within the eTrading technology group.
• Collaboration is expected across various technology teams (backend, infrastructure, QA) and business units (traders, product managers, quants).

Methodology:

• Emphasis on delivering business value and enhancing competitive edge through technology innovation.
• Application of modern software development methodologies, including CI/CD, and potentially Agile frameworks.
• Commitment to engineering excellence, ensuring adherence to development life cycles, governance, compliance, and audit mandates.
• Data-driven decision-making is implied, given the nature of financial trading and the need for performance metrics and analytics.

📝 Enhancement Note: Company information is derived from the provided LinkedIn data and general knowledge about Citi. The team structure and methodology are inferred from the job description's context about the Fixed Income eTrading team and their responsibilities, as well as Citi's general standing as a major financial institution.

Operations Career Level: This is a "Lead Engineer - UI" position, indicating a senior individual contributor role. It sits at a critical juncture where deep technical expertise meets the ability to influence technical direction and mentor junior engineers. It is a step beyond a Senior Engineer, often involving architectural input and ownership of significant components.

Reporting Structure: The Lead Engineer will likely report to an Engineering Manager or Director within the eTrading Technology division. They will collaborate extensively with Product Managers, other engineering leads, and potentially senior stakeholders in trading desks.

Operations Impact: The work directly impacts the firm's ability to execute trades efficiently, capture market opportunities, and manage risk in the Fixed Income markets. High-quality front-end development ensures traders have the tools and information necessary to make critical, real-time decisions, directly influencing revenue generation and operational efficiency.

• Technical Specialization: Deepen expertise in UI technologies, algorithmic trading platforms, and financial market technology.
• Architectural Leadership: Transition into roles with broader architectural responsibilities, potentially leading the design of entire trading platforms.
• Mentorship & Management: Move into roles with direct people management responsibilities, leading engineering teams.
• Cross-functional Mobility: Gain exposure to other areas of FinTech within Citi, such as backend development, quant roles, or product management.
• Industry Recognition: Contribute to projects that are at the forefront of financial technology innovation, potentially leading to industry recognition.

📝 Enhancement Note: This analysis is based on the "Lead Engineer" title within a specialized financial technology team. The growth path assumes progression within a large, established financial institution like Citi, focusing on both technical depth and potential leadership opportunities. The "Operations Impact" is framed within the context of a trading environment where technology directly drives revenue and efficiency.

Office Type: Citi operates a hybrid working model, allowing for a mix of in-office collaboration and remote work. The London office is a major hub.Office Location(s): 40 Bank Street, London, United Kingdom. This is a prominent financial district location, implying a professional, high-paced corporate environment.

Workspace Context:

• Collaborative Environment: The hybrid model suggests a focus on structured in-office collaboration for key meetings, brainstorming, and team building, balanced with the flexibility of remote work for focused development tasks.
• Technology & Tools: Access to state-of-the-art development tools, high-performance computing environments, and robust IT infrastructure necessary for global financial operations.
• Team Interaction: Opportunities for regular interaction with a diverse team of engineers, product managers, and traders, fostering a dynamic and intellectually stimulating work environment.

Work Schedule: While a standard 40-hour week is typical, the fast-paced nature of eTrading can sometimes demand flexibility, especially during critical market events or project deadlines. The hybrid arrangement provides a degree of autonomy in managing personal time.

📝 Enhancement Note: Details on the work environment are drawn from the job description's mention of the London office, the hybrid model, and the general context of a large financial institution. The emphasis is on how this environment supports operations professionals, particularly in terms of collaboration, technology access, and flexible work arrangements.

Interview Process:

• Initial Screening: HR or Recruiter call to assess basic qualifications, experience, and cultural fit.
• Technical Assessment: This may involve a coding exercise (live or take-home) focused on UI development, algorithms, and problem-solving, potentially using Angular or TypeScript.
• Hiring Manager Interview: Deeper dive into experience, technical leadership, and approach to problem-solving. Discussion of past projects and responsibilities.
• Panel/Team Interviews: Interviews with other engineers and potentially product managers. This stage often includes scenario-based questions, architectural discussions, and a review of your portfolio.
• Final Round: Possibly with senior leadership, focusing on strategic thinking, long-term vision, and alignment with Citi's values.
• Curate Select Projects: Choose 2-3 of your most impactful UI projects, ideally those demonstrating experience with Angular, TypeScript, real-time data, and high-performance applications.
• Structure Your Case Studies: For each project, clearly articulate:
  • The business problem/objective.
  • Your specific role and contributions.
  • The technical challenges faced (e.g., performance bottlenecks, complex state management, real-time data handling).
  • The solutions implemented (mentioning specific technologies like RxJS, NgRx, Web Sockets).
  • The measurable outcomes and impact (e.g., improved load times, enhanced user experience, increased trading efficiency).
• Prepare for Technical Deep-Dives: Be ready to discuss your code, architectural decisions, and trade-offs made during development.
• Highlight Innovation: If applicable, showcase instances where you introduced new tools, processes, or innovative solutions.
• Demonstrate Understanding of Financial Markets: If you have relevant financial industry experience, be prepared to discuss it and how your UI skills apply.
• System Design: Review concepts for designing scalable, high-performance distributed systems, particularly for user interfaces that handle real-time data streams.
• Behavioral Questions: Prepare for questions about teamwork, leadership, conflict resolution, and how you handle pressure and tight deadlines, using the STAR method (Situation, Task, Action, Result).
• Domain Knowledge: Refresh your understanding of financial markets, eTrading concepts, and common trading instruments if you have prior experience.

📝 Enhancement Note: This section provides actionable advice for candidates, inferring the typical interview process for a leadership engineering role at a large financial institution. The portfolio review and challenge preparation tips are tailored to a UI Lead Engineer role in a trading environment, emphasizing practical skills, problem-solving, and domain relevance.

Primary Tools:

• Front-end Framework: Angular (Expert proficiency required)
• Real-time Communication: Web Sockets, HTTP (Thorough understanding required)
• Legacy/Supporting Technologies: .Net, WPF (Nice to have)

Analytics & Reporting:

• CI/CD Tools: TeamCity, Jenkins (Hands-on experience required)
• Cloud Platforms: Cloud Native environments (Familiarity required)
• Monitoring & Performance Tools: Tools for real-time performance tuning and troubleshooting UI applications (Specific tools not listed, but expected)

CRM & Automation:

• Version Control: Git (Implied standard practice)
• Project Management/Ticketing: Tools like JIRA (Implied standard practice)

📝 Enhancement Note: This tool stack is directly extracted from the "Qualifications" and "Other Relevant Skills" sections of the job description. The emphasis is on the core technologies essential for the role, with additional tools that are standard for modern software development in enterprise environments.

Operations Values:

• Innovation: Drives the adoption of new approaches, solutions, and tools to stay ahead in a competitive financial market.
• Engineering Excellence: Commitment to high-quality code, robust design, and adherence to development life cycles.
• Client Focus: Balancing speed-to-market with client delivery while ensuring quality and compliance.
• Collaboration: Working effectively in cross-functional teams to achieve common goals.
• Integrity & Compliance: Upholding strict governance, regulatory, and audit mandates.
• Cross-functional Integration: Works closely with backend engineers, product managers, quants, and UX designers to deliver integrated solutions.
• Mentorship & Knowledge Sharing: As a Lead Engineer, expected to mentor junior team members and share expertise to elevate the team's capabilities.
• Data-Driven Discussion: Discussions and decision-making are expected to be informed by data, performance metrics, and user feedback.
• Agile Practices: Likely operates within an agile framework, requiring iterative development, regular feedback loops, and adaptability.

📝 Enhancement Note: Citi's stated values and the nature of the role imply a culture that values innovation, technical rigor, and collaborative problem-solving within a regulated environment. The "Lead Engineer" title suggests a role that fosters knowledge sharing and technical guidance.

• High-Frequency Trading Demands: Developing UI applications that can handle massive amounts of real-time data with ultra-low latency and high availability.
• Complex Financial Domain: Quickly learning and applying intricate financial concepts (Spread Products, eTrading mechanics) to build effective trading tools.
• Balancing Innovation with Stability: Implementing cutting-edge UI technologies and practices while maintaining the stability and reliability required in a critical trading environment.
• Global Platform Development: Ensuring solutions are scalable and consistent across a global platform, catering to diverse user needs and regulatory requirements.
• Adhering to Strict Governance: Navigating and complying with rigorous financial regulations, audit requirements, and internal governance frameworks.
• Advanced UI Technologies: Deepen expertise in modern front-end frameworks, state management, and performance optimization techniques.
• Financial Markets & Trading Systems: Gain in-depth knowledge of fixed income markets, eTrading strategies, and algorithmic trading platforms.
• Cloud & DevOps: Enhance skills in cloud-native development, CI/CD practices, and infrastructure automation.
• Architectural Design: Develop skills in designing complex, distributed systems for financial applications.
• Leadership & Mentorship: Hone leadership and mentoring abilities by guiding junior engineers and contributing to team growth.

📝 Enhancement Note: Challenges are inferred from the demanding nature of eTrading in financial services and the role's technical scope. Growth opportunities are aligned with typical career progression for senior engineers in such environments, focusing on skill enhancement and leadership.

Strategy Questions:

• UI Architecture: "Describe the architecture of a complex, real-time UI application you've led. How did you ensure performance, scalability, and maintainability? Discuss your experience with Angular, RxJS, and NgRx in this context." (Focus on demonstrating architectural thinking and hands-on experience).
• Problem Solving & Debugging: "Walk me through a challenging UI performance issue you encountered in a trading application. What steps did you take to diagnose and resolve it? What tools did you use?" (Showcase diagnostic skills and systematic problem-solving).
• Technology Adoption: "How do you evaluate and introduce new technologies or frameworks into a development team, especially in a regulated environment like finance? Provide an example of a new approach you successfully championed." (Highlight innovation and pragmatic adoption).

Company & Culture Questions:

• "Citi operates in a highly regulated financial environment. How do you ensure your development practices align with governance and compliance standards?" (Demonstrate awareness of the industry context).
• "Describe your experience working in a hybrid or remote team. How do you foster collaboration and maintain productivity?" (Showcase adaptability and teamwork skills).
• "What interests you specifically about working on eTrading platforms at Citi, and how do you see your role contributing to our success?" (Connect your motivations to Citi's business and the team's objectives).
• Start with Impact: Begin each case study with the key business problem and the significant outcome achieved.
• Quantify Achievements: Use numbers and metrics wherever possible (e.g., "reduced load time by 30%", "handled X concurrent users", "improved order placement success rate by Y%").
• Explain Your 'Why': Clearly articulate the rationale behind your technical choices and design decisions.
• Be Prepared for Deep Dives: Anticipate detailed technical questions about your code, architectural decisions, and trade-offs.
• Showcase Collaboration: If possible, describe how you collaborated with other teams or stakeholders to achieve project success.

📝 Enhancement Note: Interview preparation advice is tailored to a Lead UI Engineer role in finance, focusing on technical depth, problem-solving, understanding of the financial domain, and effective communication of achievements through a portfolio.

To apply for this Lead Engineer - UI position:

• Customize Your Resume: Tailor your resume to highlight experience with Angular, TypeScript, real-time data handling, performance optimization, and any financial industry experience. Use keywords from the job description.
• Prepare Your Portfolio: Select 2-3 key UI projects that best demonstrate your skills in designing, building, and optimizing high-performance front-end applications. Structure your case studies to showcase impact and technical solutions.
• Research Citi and the Team: Understand Citi's position in the financial market, its technology initiatives, and the specific function of the Fixed Income eTrading team to articulate your interest and fit.

⚠️ 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.

Application Requirements

Candidates should have proven experience in designing and supporting large-scale UI applications, particularly using Angular and Typescript. Familiarity with electronic trading solutions and the financial industry is advantageous.

Annual Leave, Performance Related Bonus, Private Medical Care, Life Insurance, Employee Assistance Program, Pension Plan, Paid Parental Leave, Special...