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Senior Frontend Engineer; Conversational & General User Interface

Job in York and North Yorkshire, York, North Yorkshire, YO1, England, UK
Listing for: Farther
Full Time position
Listed on 2026-09-29
Job specializations:
  • Software Development
    Full Stack Developer, Front End Developer, Software Engineer
Salary/Wage Range or Industry Benchmark: 90000 - 120000 GBP Yearly GBP 90000.00 120000.00 YEAR
Job Description & How to Apply Below
  • Farther’s AI assistant answers advisor questions and drives the product on their behalf — navigating, opening workflows, and more
  • This role continues and deepens the interaction between the assistant and our traditional UI platform. Next, it composes the interface itself
  • You will contribute to both the framework that makes that possible and the assistant itself
  • You are not designing screens, you are designing the system that decides what a screen can be, and the guardrails for the moment it is handed something nobody anticipated
  • Deliver the assistant experience, prototype → production — the surface advisors reach for, and the thing every other item on this list exists to make possible
  • Build the framework underneath it, so any Farther surface can declare what the agent can do and what it can see in a few lines
  • Design the renderer that turns a model’s output into a real, validated, submit table interface, extensible so a new kind of input is additive and never a refactor
  • Negotiate and version the wire contract with the agent backend team, and hold both sides to it with tests
  • Treat developer experience as a first-class deliverable — design the API, document it, and judge it by how many teams build on it without asking you for help
  • Mentor the engineers coming up behind you and set the quality bar in review
  • Technical Stack
    React
  • Type Script
  • Python
    Tan Stack Query
  • React-hook-form
  • Zod
    Styling — Tailwind and CSS
    UI modules built and deployed independently, then assembled into one application
    Testing Library
  • ESLint
  • Prettier
  • Git Hub Actions CI
Benefits
  • Opportunity to work with a talented team of professionals.
  • Drive the success of a venture-backed, rapidly growing firm

Comfortable context-switching across multiple concurrent work streams

Fluent in an AI-assisted development loop — building with Claude Code, shipping through Git-based PRs and automated review

Distributed systems fundamentals — timeouts, retries, idempotency, failure isolation

Genuine product instincts — you care about the user experience, and raise ambiguity as a decision rather than absorbing it as a guess

Composition over configuration; modular, scalable frontend patterns are how you think by default

Strong knowledge-sharing / documentation habit6+ years building production web applications, including time somewhere the frontend was the product

Production experience with LLMs — agentic systems, tool calling, streaming responses, conversational interfaces — and a point of view on what an interface owes a user when the model is slow, wrong, or halfway through an answer

Expert-level frontend engineering, where strict typing is how you already work

End-to-end ownership and a track record of meeting deadlines

Used or extended a framework for agent-to-UI communication, and can say precisely where it stopped being enough

Built and versioned a component library other teams depended on, and know what a breaking change costs once they have all imported itAWS fluency — Lambda, API Gateway, DynamoDB, Cloud Watch Turned  LLMs on how your own team builds: codegen, large-scale migrations, spec-to-code pipelines

Engineering platform or internal tooling — Vercel, an internal PaaS, or the developer platform at your last company

Wealth management, financial services, or analytics products dense with numbers people act on — including the craft that keeps them fast: profiling, bundle size, render performance

Position Requirements
10+ Years work experience
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