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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