Senior Frontend Engineer
🔒 Confidential Employer
Posted 28 April 2026
LOCATION
London
TYPE
Full-time
LEVEL
Mid-Senior level
SALARY
£140,000 / year
CATEGORY
Technology
This employer holds a UK Home Office sponsor license — sponsorship for this specific role is at the employer’s discretion
SKILLS
React
TypeScript
Software Engineering
UI Development
API Design
Design Systems
Performance Optimization
Large Datasets
FULL DESCRIPTION
Senior Frontend Engineer, [Employer hidden — view at passion-project.co.uk]
Company: [Employer hidden]
Location: London, United Kingdom
Salary: £80-140k per year
Work Type: Hybrid (2-4 days a week in office)
Job Type: Full-time
Experience Level: Senior and Expert level
About the Role
Join our Product Community team as a Frontend Software Engineer and play a key role in shaping cutting-edge user experiences! You'll work on exciting, high-impact projects ranging from AI-powered features to rich data visualizations while collaborating closely with talented backend engineers and product managers.
- Innovate with AI: Implement intelligent features that guide users and streamline complex workflows
- Visualize Complex Data: Build and optimize advanced data visualizations like charts, maps, and real-time dashboards
- Shape the Design System: Influence and maintain our proprietary design system to deliver consistent, high-performance UIs
- Tackle Real Challenges: Solve complex problems involving large datasets, real-time updates, and system performance
- Drive the Future: Be part of a forward-thinking team that embraces new technologies and continuous learning
Responsibilities
- Build and maintain user interfaces for client-facing features, ensuring high-quality and performant UI delivery
- Collaborate with backend engineers and product managers to design, develop, and deliver new features while offering technical input on API design and data handling
- Implement and enhance AI-driven capabilities that assist users with complex workflows (e.g., generating actionable insights)
- Develop advanced data visualizations (charts, maps, dashboards) that provide users with real-time, interactive insights
- Contribute to and maintain our internal design system, including custom caching mechanisms and advanced state management solutions
- Continuously balance delivering new features with ongoing maintenance and performance optimization
- Proactively identify and resolve issues while ensuring continuous delivery and improving technical processes
Who You Are
- Strong experience as a software engineer working on production systems
- Proven expertise in building scalable UIs with React and TypeScript
- A track record of collaborating with backend engineers to shape API design and optimize data consumption
- Experience working with design systems, performance optimization, and handling large datasets
- Strong communication skills and a problem-solving attitude
- A good dose of humility and the willingness to grow (no matter your seniority!)
- A fluent level in English (French is not required)
Tech Stack
- Languages & Frameworks: React (TypeScript)
- Testing Tools: Vitest (unit testing), Cypress (E2E testing)
- Build Tools: Vite (for local development and production bundling)
- Custom Solutions: Internal design system, advanced caching mechanisms, and proprietary state management built on top of open-source technologies
Company Insights
Company Size: 201-500 employees
Industry: Fintech, B2B, Enterprise, SaaS, Data Analysis
Funding: $388.9m total funding
Company Benefits
- Healthcare including dental
- Brand new offices in the heart of Paris, London (Liverpool Street), New York and Toronto
- One company offsite every year in Paris
- Generous maternity (16 weeks full pay) /paternity leave (5 weeks full pay + 4 weeks half time work but fully paid)
- 50% home work stipend covered by [Employer hidden]
- Free Lunches
- Monthly office socials. Quarterly team socials
Application Instructions
Apply
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