Senior Software Engineer - Web Infrastructure & Design System

The role

You will join the Web Infrastructure team to build shared foundations for web and app platforms, design systems, edge computing, and experimentation. You will build platforms for web performance and accessibility, evolve the design system, and improve developer experience and reliability.

What you will do

• Build platforms that enable market-leading web performance and accessibility.
• Evolve the design system to help engineers, designers and AI agents deliver consistent experiences.
• Improve developer experience and reliability through faster builds and actionable error reporting.
• Create tools that make systems easier to develop and operate.
• Own problems from discovery through delivery by working with internal customers.

Required qualifications

• Deep experience with a modern frontend framework (Preact), TypeScript and CSS.
• Ability to diagnose performance bottlenecks and measure effects on Core Web Vitals and real-world performance.
• Experience building and maintaining robust and reusable design systems and developer tooling.
• Experience managing governance, compatibility and providing documentation and migration paths.
• Experience embedding automated accessibility checks into component tests and CI.
• Experience with keyboard and assistive technology testing.
• Experience operating production infrastructure through infrastructure as code tools, such as Terraform.
• Understanding of how clear interfaces, reusable capabilities, machine-readable context and automated validation help agents work reliably.
• Comfortable with ambiguous problems, challenging proposed solutions and weighing trade-offs.
• Use of research, adoption metrics and performance data to guide decisions.

Benefits

• Company pension contributions at 5%.
• Individualised training budget.
• Discounted holidays for you, your family and friends.
• 25 days of holidays per annum plus 8 public holidays, increasing by 1 day every second year up to 30 days.
• Ability to buy and sell annual leave.
• Cycle to work scheme.
• Season ticket loan.
• Eye care vouchers.

Before you apply

• The interview journey includes a TA screening, 1st stage interview with the Hiring Manager, a tech challenge (live or take home), and a final stage.

About the company

loveholidays is an OTA in Europe that uses progressive technology to help customers discover, book and experience holidays.