Front-End Developer – React or Angular (Front Office & Risk Systems)

Front-End Developer – React or Angular (Front Office & Risk Systems)

Join MARGO in the UK (London) – Permanent & Contracting Opportunity

MARGO is a tech-native consultancy delivering high value-added IT expertise to the financial services industry.

We operate in complex Front Office and Risk environments where user interfaces are critical components of trading, risk and decision-making systems. Our consultants design and build high-performance, real-time and maintainable UI platforms used daily by Front Office, Risk and technology teams.

Joining MARGO means working on technically demanding UI platforms, close to business users, while benefiting from a human-sized structure, strong engineering standards and tailored career paths.

Business Context

You will work within Front Office and Risk technology environments, contributing to the design and evolution of modern web-based user interfaces.

These platforms typically support

• real-time trading and monitoring workflows
• risk and P&L visualisation
• analytics and control dashboards
• operational and decision-support tools

The role requires strong ownership of UI architecture, performance and code quality, with close interaction with backend, production and business teams.

Role Overview

• We are looking for a Front-End Developer with deep expertise in either React or Angular to work on complex Front Office and Risk UI platforms.
• Candidates are expected to be experts in one of the two frameworks.
• We are not looking for profiles with superficial exposure to both.
• The role is hands-on, engineering-driven and focused on building scalable, real-time and maintainable front-end applications operating under production and performance constraints.

Key Responsibilities

Front-End Architecture & Development

• Design and develop high-performance front-end applications using React or Angular
• Own UI architecture, component design and state management
• Build data-intensive and real-time user interfaces
• Ensure scalability, maintainability and long-term evolvability of UI platforms
• Apply best practices around clean code, refactoring and testing

Real-Time & Performance Considerations

• Develop UIs consuming real-time or near real-time data streams
• Manage high-frequency UI updates and rendering efficiency
• Optimise performance under real-time constraints
• Control latency perception, responsiveness and user experience
• Work with event-driven and streaming data sources

Collaboration & Integration

• Work closely with backend teams to define and consume APIs
• Collaborate with production, infrastructure and QA teams
• Translate business and user needs into robust UI solutions
• Act as a technical reference on front-end topics within the team

Quality & Engineering Standards

• Enforce high standards for code quality, testing and documentation
• Participate in code reviews and architectural discussions
• Contribute to continuous improvement of front-end practices and tooling
• Support mentoring and knowledge sharing while remaining hands-on

Technical Environment

Core Front-End Technologies

• React OR Angular (expert level – one is mandatory)
• TypeScript and modern JavaScript
• State management (Redux, NgRx or equivalent)
• HTML5, CSS3 and modern styling approaches
• Component-based architecture and modular design

Real-Time & Performance Constraints

• User interfaces consuming real-time or near real-time data
• High-frequency UI updates and data refresh mechanisms
• Performance optimisation under real-time constraints
• Management of rendering efficiency, responsiveness and latency perception
• Interaction with event-driven and streaming data sources

Valued Front-End Exposure

• Real-time UI patterns (WebSockets, streaming APIs or equivalent)
• Data grids and complex visual components
• Performance profiling and optimisation techniques
• Modern build tools and frameworks (Vite, Webpack or equivalent)
• Unit and integration testing frameworks

Supporting Technologies (Context)

• API-driven architectures
• Authentication and authorisation mechanisms (SSO, JWT, OAuth or similar)
• CI/CD pipelines and version control systems
• Interaction with backend systems and databases

Required Experience & Skills

Essential

• Strong experience as a Front-End Developer on complex web applications
• Expert-level proficiency in either React or Angular
• Solid understanding of front-end architecture and design patterns
• Experience building scalable and maintainable UI platforms
• Strong attention to performance and user experience
• Ability to work in demanding Front Office or Risk environments
• Excellent communication and collaboration skills

Valued (but not restrictive)

• Exposure to Front Office, Risk or real-time systems
• Experience working on data-intensive or analytical UIs
• Familiarity with real-time communication patterns
• Mentoring or technical leadership experience

Why Join MARGO

• Access to complex Front Office and Risk UI platforms
• Strong emphasis on engineering quality and clean front-end architecture
• Real-time, performance-sensitive UI challenges
• Human-sized consultancy with close support and long-term focus
• Long-term career opportunities across engineering and architecture

Interested? Motivated? Apply on our website or at [email hidden — sign in]