Front End Design Engineer
A Front End Design Engineer at Seamflow owns the full interface for AI-powered certification and inspection workflows — sketching, building, and shipping dense, expert-facing React front ends (typography, motion, interaction, design system, state) and shipping to production in week one, working in person in Shoreditch, London.
- Compensation
- Not disclosed
- Location
- London
- Work setup
- Onsite
- Seniority
- Not specified
- Employment
- Not specified
- Experience
- Not specified
- Category
- Frontend
- Posted
Skills
Must have
- Designed and built an interface that real people used every day — shipped, adopted, and improved (not mockups or unused component libraries)
- Strong design taste in typography, spacing, motion, and hierarchy; can notice and explain pixel-level issues
- Builds the whole thing end to end: design, frontend, and the state/data layer behind it
- Can design for density: expert users, complex workflows, hundreds of fields on a screen
- Goes to the source: observes real users at work and designs for what they actually do
- In-person work in Shoreditch, London; comfortable with a fast-paced, high-ownership startup culture
Nice to have
- Design engineering or front-end experience at companies like Linear, Vercel, Notion, or Figma
- Has built and maintained a design system
- Work on interfaces where people review or correct AI output
- Founder or founding-team experience (e.g. EF / YC / Antler, early or stealth-stage startup)
Full description
About Seamflow
Every plane, medical device, lift, battery and building has to be tested, inspected and certified before it reaches the world. It's the invisible layer that keeps the physical economy safe, and it still runs on Word documents, PDFs, spreadsheets and email. Seamflow is the software layer for that industry. We build AI-powered workflows for certification bodies, notified bodies and inspection companies: scheduling and resource planning, technical review, conformity assessment, field inspection, and document intelligence over messy real-world files.
Where we are:
- Live in production inside some of the largest enterprises in the industry
- $4.5M seed, 14x oversubscribed, co-led by Northzone and Initialized Capital, the funds behind Spotify, Klarna, Coinbase and Reddit. Angels include Charlie Songhurst and Mario Götze.
- Demand is outstripping what we can build. That's the reason this role exists.
The team
Most of our engineers were olympiad medallists in maths, physics or informatics before they were engineers. The team has come to us from Google, Amazon, X, Yandex, McKinsey and Bain, and from founding-engineer seats at startups that went on to multi-billion-dollar valuations. We hire against a very high bar, and this role exists to raise it further.
The role
A Front End Design Engineer thinks in finished interfaces, not mockups or components in isolation. A technical reviewer at a notified body spends their day inside a 400-page technical file, cross-referencing clauses, checking test reports against standards, and deciding whether a medical device is safe to sell. Today they do that in Word, Acrobat and a spreadsheet someone built in 2011. The interface they use decides how fast they work and whether they trust the AI sitting next to them.
You own that interface. Layout, typography, interaction, motion, the design system underneath it, and the React that ships it. You decide how a reviewer sees a finding, how they correct a model that got it wrong, and how a hundred fields of dense regulatory data become something a person can actually read. You sketch it, build it, ship it, then sit next to someone using it and find out what you got wrong. You'll ship to production in your first week.
What we're looking for
We care far more about taste and engineering strength than about matching a list of tools. If you're excellent, we'll hire you whether you've spent the last three years in React, Svelte, Vue or something we haven't heard of. Our stack is learnable in a fortnight. Judgement, craft and speed are not.
What we're actually screening for:
- You've designed and built an interface that real people used every day. Not a Dribbble shot, not a component library nobody adopted. Something that shipped, got used, and got better.