✨ 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 protected]

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

Skills

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