Frontend Engineer – 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
• Design systems around composition-first principles: small orthogonal building blocks, clear extension points, and patterns that avoid fragmentation (controlled/uncontrolled, slots/compound components, render props where appropriate)
• 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
• Hold a high bar across variants and edge cases; improve quality without adding unnecessary complexity
• 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
• Define agent-legible representations of components/tokens/states and the guardrails needed for safe recomposition and generation
• Create feedback loops so system changes (both human and agent-made) are observable, comparable, and trustworthy (docs, examples, internal tooling, regression checks)
• 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.

Desirable attributes:

• 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

Some of the benefits we include are:

• Private Medical Insurance
• Dental Insurance
• Parental Support
• Salary-Exchange Pension
• Employee Assistance Programme (EAP)
• Local Oxford Discounts
• Cycle-to-work Scheme
• Flu Jabs

At AER, we are committed to offering flexibility in the way we work. Most of our roles are hybrid with a mix of in-office/home working and potentially adjustable working hours. Let’s discuss what works for you and AER during the interview process.

The Company is committed to the principle that no employee or job applicant shall receive unfavourable treatment on grounds of age, disability, gender reassignment, race, religion or belief, sex, sexual orientation, marriage or civil partnership, pregnancy, and maternity.

To apply, please submit your Résumé / CV, a personal summary, your salary expectations and please inform us of your notice period.****Unfortunately, we are unable to accept applications via email, telephone, or social media platforms. To be considered for this position, please submit your application using the link provided. Applications submitted through any other channel will not be reviewed.