Senior Frontend Engineer (React / Next.js)

Job title: Senior Frontend Engineer (React / Next.js)

About the Role MandM is looking for a Senior Frontend Engineer (React / Next.js) to lead the planning and execution of user-facing applications and services. You will own frontend architecture, drive scalable, accessible experiences, and mentor junior engineers as part of cross-functional squads. This role requires initiative, strategic thinking, and the ability to operate with minimal supervision to deliver measurable impact on quality and user value.

What You'll Do

• Architect scalable React / Next.js applications and define clear component boundaries; evolve architecture standards and the shared component library to ensure consistency across product teams.
• Lead efforts to improve state management and application performance, including bundle size and rendering.
• Fully own the testing lifecycle of your deliverables; write clean, well-tested code; establish comprehensive unit tests; collaborate with Staff Engineers to define the SDLC, Test Strategy, and Definition of Done across teams.
• Proactively pitch technical initiatives and architectural ideas; define the frontend technology direction; drive decisions affecting agility, speed of delivery, and UI scaling; take financial and operational responsibility for GCP costs and performance of user-facing assets.
• Champion accessibility and mentor colleagues; ensure UI solutions meet strict digital accessibility standards; adopt AI-Pair Programming while maintaining mandatory review frameworks for AI-generated code.

What We're Looking For

• Strong experience as a Senior Frontend Engineer with React / Next.js; ability to lead architecture, set standards, and own space with minimal supervision.
• Proven track record of building accessible, performant frontend experiences; deep knowledge of accessibility standards and compliance.
• Expertise in frontend performance optimization, state management, and scalable UI architecture; experience with bundle size reduction and rendering improvements.
• Experience with cloud costs and performance management, specifically Google Cloud Platform (GCP) and frontend assets.
• Experience working in product teams and cross-functional squads; ability to drive end-to-end frontend lifecycle from architecture to production.
• Comfortable with AI-assisted development and AI-Pair Programming concepts; ability to adapt review processes for AI-generated code.

Nice to Have

• Experience with AI-assisted development tooling; familiarity with AI code review frameworks.

Compensation & Benefits

• Competitive Salary
• 2 days paid volunteering to support a cause
• Career Growth: Opportunity to grow
• Staff Discounts
• Company Pension
• Generous Holiday Allowance: 5 weeks of well-deserved breaks (with option to buy extra)
• Birthday Delight: Take your special day off
• Free Parking
• Health & Wellbeing programme