Software Engineer – UI, Agent-first Design Systems

Role Overview

• Own a token-first approach: semantic tokens that encode intent (not just values), multi-theme support, and predictable propagation into CSS variables and Tailwind mappings
• Define conventions for naming, layering (core → semantic → component), and change management so teams can adopt incrementally
• Ensure components consume tokens (not hard-coded styles) so overrides and theme changes behave reliably
• Design and build highly reusable primitives and components with accessibility, state correctness, and interaction quality as default
• Leverage headless UI foundations to ship production-ready components with crisp, maintainable APIs
• Build and evolve product-oriented composites and patterns over time (tables, filters, dashboards, workflows), turning repeated needs into stable, documented patterns
• Validate patterns against real constraints: data density, empty/error/loading states, performance, and responsive behaviour
• Apply deep CSS expertise to ship refined micro-interactions, transitions, and animations that communicate hierarchy, feedback, and affordance
• Build the workflows that keep iteration fast: prototyping playbooks, tight feedback cycles, and repeatable ways to explore solutions, variants, states, and granular interactions without creating one-off debt
• Partner with product and engineering on adoption strategy, compatibility, deprecations, and migration paths
• Help define standards for contribution, review, and release discipline; shape the culture and leverage of the design function as it grows

Requirements

• Strong React/TypeScript fundamentals with proven experience building component libraries/design systems used across teams or products
• Experience applying tailwind CSS in scalable design systems using structured utility patterns, class composition and design tokens
• Skilled at headless UI composition and component API design with accessibility baked in
• High bar for visual quality and interaction design
• Familiarity with agent coding tools (e.g. Claude Code, Codex, OpenCode) and emerging AI powered workflow patterns e.g. Spec Driven Development / Plan modes, parallisation using worktrees, multi-agent orchestration, agents.md , skills etc.
• Experience with data-heavy B2B interfaces and charting/theming systems
• Internal tooling/CLI/platform experience
• Experience with Rive.app

Tech Stack

• React
• TypeScript

Benefits

• A collaborative, mission-driven environment focused on transforming the global energy transition.
• A fun, informal, collaborative, and international work culture
• A competitive salary package
• Access to regular coaching and mentoring sessions, and the opportunity to learn from experienced professionals
• Private Medical Insurance
• Dental Insurance
• Parental Support
• Salary-Exchange Pension
• Employee Assistance Programme (EAP)
• Local Oxford Discounts
• Cycle-to-work Scheme
• Flu Jabs