SEEKR
Senior Frontend Engineer
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You sweat the details. You open a SaaS app and immediately notice the component that shouldn't be a modal, the auth flow nobody thought through, the table that takes half a second too long to load. Most engineers file a ticket. You fix it — and then you make sure it never happens again. That instinct is exactly what this team needs.
The company
This is an AI-native integration layer for SaaS products and agents: unified APIs, MCP-friendly tooling and A2A (agent-to-app and app-to-app) bridges so builders can wire their products into hundreds of third-party tools without hand-rolling every integration. It handles managed auth, real-time observability and connector sprawl so product teams can focus on great agent experiences instead of glue code. Your job is to make the surface they see feel as well-engineered as the plumbing underneath.
Why this role exists
The product experience is the brand. This is the first dedicated UX Engineer role — you’ll be the in-house authority on taste, polish and performance. You won’t be one of many contributors to the front end; you’ll set the standard everyone else works to: the component library, the design system, the micro-frontend architecture, and the AI rules and tooling that let the rest of the team move fast without making a mess. As the CTO put it in conversation: “It’s about setting the processes, the libraries, the tech stack… spreading the knowledge so that everyone can go to 90% of your level.”
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What you’ll actually do
- Own the design system – define the visual language, build reusable primitives, and maintain the libraries that power every interface.
- Ship pixel-perfect UI in React, with real ownership of theming, performance and motion.
- Make performance a feature – instrument Core Web Vitals, set bundle budgets, optimise hydration patterns and chase performance where it actually matters.
- Be the voice of quality – host design critiques, push back on product design when it matters, and be the person who asks “what happens in this edge case?”.
- Prototype and validate – turn product ideas into interactive proofs-of-concept that help PMs and designers converge on the right answer fast.
- Lift the whole team – create AI-powered tooling and internal rules so every engineer can contribute to the front end at your level.
The split is roughly 70–80% front end, 20–30% back end (Node, React-router, SvelteKit) — enough to remove performance bottlenecks without being a full-stack role.
Who you’ll work with
You’ll report directly to the technical leadership and work most closely with the Product Manager and Product Designer day-to-day. The team is fast, flat and product-focused: engineers own their features end-to-end and interact with product directly, so your decisions will show up quickly in what customers use.
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Must-haves
- 4+ years professional front-end engineering, with a portfolio that shows you care about the details.
- React & TypeScript at production scale (hooks, suspense, server components).
- Deep CSS fluency (Tailwind or equivalent) and modern browser APIs.
- A strong UX sense for B2B SaaS flows — you’ve lived through auth flows, billing pages and dashboards, and you know where the traps are.
Nice to have
- Svelte, Web Components or other framework experimentation.
- Experience with auth flows (OAuth2, OpenID Connect) and secure front-end patterns.
- Prior work on B2B developer tools or dashboards at the seed-to-Series-B stage.
What’s on offer
- £80,000–£110,000 base + annual company performance bonus.
- Meaningful EMI share options.
- £15/day lunch budget when working from the London office
- £1,000 home office setup + £500/year top-up.
If you read this far and you'd like your CV reviewed by a human, email mark@seekr.inc with "Watch me React" in the subject line. A couple of lines on why you think this might be a good fit — that's all.
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