Senior Design Engineer

Payaca; West of England; On-site; GBP 70,000 - 110,000; Full time

Job summary

Payaca is seeking a Senior Design Engineer to shape how our installer-focused software looks and behaves across desktop, mobile, and offline modes. You will own design decisions from brief through to production, grow and mature our design system, and collaborate with product engineers to ship high-quality, scalable interfaces used daily by field staff and office teams.

With 4+ years frontend experience, you will balance visual taste with practical implementation, embrace AI-assisted coding, and

Qualifications

• 4+ years shipping production frontend
• Strong in TypeScript, React and CSS
• Visual design taste with real user-built work
• 3+ months using AI coding agents
• Experience taking interface work from brief to production
• Ability to adapt UI to API or data-model changes
• High quality mindset and testable code
• Curiosity about clean-energy installers and their business

Responsibilities

• Take hardest design problems end to end: define the problem, design, build, ship and monitor production
• Grow our design system, balancing consistency with expanding requirements
• Mature our design system for agents and developers to work efficiently
• Raise the floor on quality across the product and improve difficult flows
• Design for desktop, mobile, and offline-first usage
• Pair with product engineers on the screens they're building
• Use agents to handle volume work like variants and migrations
• Set patterns and standards through review and work

Skills

Frontend development

TypeScript

React

CSS

Design system

AI coding agents

Product ownership

Offline-first design

Job description

This is not a Frontend Engineer with a new job title, and it isn't a designer who prototypes in code. A Design Engineer designs in the medium the product actually ships in. You'll prefer making visual and interaction decisions in the platform they'll be built in, because designing for the web in Figma duplicates effort when you're comfortable implement it too.

Our users are not browsing. They are installers, engineers and office staff running a business inside Payaca all day. That's the design brief: repeat-use business critical software where a saved click compounds hundreds of times a day.

What you'll do

• Take our hardest design problems end to end: shape the problem, decide the design, build it, ship it, and watch how it lands in production
• Grow our design system, balancing consistency with expanding requirements
• Mature our design system, enabling agents and devs to work efficiently across the product
• Raise the floor on quality across the product - the flows that work but feel like hard work
• Design for different usage patterns with varying constraints: back office staff on desktop web, their customers on mobile web, and field engineers on offline first mobile
• Pair with product engineers on the screens they're building, so taste spreads rather than bottlenecks on you
• Use agents to do the volume work - variants, sweeps, migrations - so your own time goes on judgement
• Set the patterns and the bar, through review and through the work itself
  

What we're looking for

• 4+ years shipping production frontend, strong in TypeScript, React and CSS
• Visual design taste you can point at - work you designed and built yourself, in the hands of real users
• A track record of owning interface work from a vague brief through to production, resolving most of the ambiguity yourself
• 3+ months getting real work done with AI coding agents, delegating meaningful chunks rather than autocompleting
• Enough range to follow a change past the UI when it needs API or data-model shape to work properly
• A high bar for quality, and the discipline to never merge code you can't stand behind, whether you or an agent wrote it
• A healthy curiosity about clean-energy installers and the businesses they run

This probably isn't for you if

• You want to work on the design system full time, rather than on the product with the design system as a means
• You need research and sign-off before you can start building
• You need it perfect before it ships
• You need someone else to break the work down and sequence it for you

For more information see the full ad at https://payaca.com/uk/careers/senior-design-engineer