Javascript developer javascript html5 Work, Jobs (with Salaries)

Front-End Developer – React or Angular (Front Office & Risk Systems)
Margo Conseil —London
- JavaScript
- Mentoring
- APIs
Full Stack Developer
Consilience Group —London
- £55,000 - £85,000 a year
- Computer Science
- AWS
- JavaScript
Front End Developer – Angular
CGI —Leatherhead
- Full-time
- JavaScript
- Agile
- Communication skills
Quick apply
8d
Intermediate C# Full Stack Developer
Palantir —Aberdeen
- Customer service
- Java
- JavaScript
Quick apply
WEB DEVELOPER
Santriya Technologies —London
- JavaScript
- HTML
Lead Front End Developer
Oak Furnitureland —Swindon
- £60,000 a year
- Full-time
- Hybrid work
- Team management
- JavaScript
- APIs
- Free parking
- Employee assistance programme
Web Designer
Bucks DigiTech Ltd —High Wycombe
- £27,000 - £30,000 a year
- Full-time
- Hybrid work
- SQL
- JavaScript
- Organisational skills
- Free parking
- Flexitime
Quick apply
4d
UX Developer
Simplify Group —Remote
- £50,000 - £55,000 a year
- Full-time
- Remote
- Azure
- JavaScript
- Travel
Quick apply
12d
Software Developer, Sports Content
bet365 —Manchester
- Full-time
- Hybrid work
- SQL
- JavaScript
- APIs
Quick apply
Lead Frontend Developer
Inspired Thinking Group (ITG) —Birmingham
- Full-time
- Remote
- JavaScript
- Mentoring
- APIs
- Employee assistance programme
- Employee discount
Quick apply
Web Developer
BABBLE CLOUD HOLDINGS LIMITED —Basildon
- £50,000 - £61,000 a year
- Full-time
- JavaScript
- APIs
- In-person
- Free parking
- Life insurance
Quick apply
IT Web Developer - Website Creation - Coding
321 Estates Construction Ltd —Remote
- £15 - £30 an hour
- Temporary
- Remote
- Azure
- DevOps
- SQL
Quick apply
7d
Junior Angular developer - Glasgow, UK - Fulltime - Hybrid
Capgemini —London
- Hybrid work
- Management
- AWS
- JavaScript
10d
Founding Frontend Engineer
Innerworks —London
- £75,000 - £90,000 a year
- Full-time
- Hybrid work
- JavaScript
- APIs
- HTML
Quick apply
Java Developer
Twastra Technologies —London
- Oracle
- English
- Java
Web Designer
THE FBKS GROUP LIMITED —London
- £32,000 - £42,000 a year
- Full-time
- SQL
- JavaScript
- In-person
Quick apply
Web Designer
Artech3D Ltd —London
- £31,000.00 - £49,549.80 a year
- Full-time
- SQL
- JavaScript
- Organisational skills
Quick apply
PHP Web Developer
Gud Ideas —Milton Keynes
- £28,000 - £35,000 a year
- Full-time
- SQL
- JavaScript
- Scripting
- Free parking
- Flexitime
Quick apply
Cloud Frontend Engineer
Signaloid —Cambridge
- £45,000 - £60,000 a year
- Full-time
- Remote
- Computer Science
- Engineering
- Master's degree
Quick apply
Software Developer, Risk and Regulatory
bet365 —Stoke-on-Trent
- Full-time
- Hybrid work
- SQL
- JavaScript
- Software development
Quick apply

I want to receive the latest job alerts for javascript developer javascript html5

By signing in to your account, you agree to SimplyHired's Terms of Service and consent to our Cookie and Privacy Policy.

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

Margo Conseil -
London

Apply Now

Job details

Permanent

Qualifications

CSS
React
JavaScript
Mentoring
Redux
Angular
APIs
IT
Financial services
UI
Leadership
TypeScript
Communication skills
HTML
Design patterns

Full job description

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]

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

Apply Now

Refine Your Search

javascript developer javascript html5 jobs

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

Full Stack Developer

Front End Developer – Angular

Intermediate C# Full Stack Developer

WEB DEVELOPER

Lead Front End Developer

Web Designer

UX Developer

Software Developer, Sports Content

Lead Frontend Developer

Web Developer

IT Web Developer - Website Creation - Coding

Junior Angular developer - Glasgow, UK - Fulltime - Hybrid

Founding Frontend Engineer

Java Developer

Web Designer

Web Designer

PHP Web Developer

Cloud Frontend Engineer

Software Developer, Risk and Regulatory

I want to receive the latest job alerts for javascript developer javascript html5

Related Searches

Explore jobs in more locations

Jobseeker tools

Employer Tools

Browse

Stay Connected