Senior Full Stack Engineer (Frontend Focus)

Posted 13 Days Ago
Hiring Remotely in United Kingdom
Remote
Senior level
Artificial Intelligence • Software
The Role
As a Senior Frontend Full Stack Engineer, you will develop web applications and user experiences, integrating data insights and AI capabilities while collaborating with a diverse team.
Summary Generated by Built In

At Complexio, we’re building the intelligence layer for enterprise AI—automatically creating a connected understanding of an organisation’s people, processes and systems, and turning that into real-time automation and insight. Our platform ingests structured and unstructured data, constructs a living Event Knowledge Graph, and orchestrates multiple AI models to uncover hidden workflow opportunities and drive autonomous action.

As a Senior Frontend Full Stack Engineer, you will join us at an exciting inflection point: you’ll help shape the way thousands of enterprise-users engage with our platform. You’ll work with a team of software engineers, data scientists, product experts and business analysts to craft next-generation web applications and user experiences that bring our powerful automation engine to life. Your role will be foundational in translating data-rich insights into intuitive, performant, and scalable interfaces - bridging the gap between advanced AI infrastructure and real-world business impact.

If you are passionate about working at the intersection of rich front-end engineering, full-stack product delivery and enterprise AI innovation, and you thrive in a fast-moving, deeply technical team, then we’d love to hear from you.


Requirements
  • React + TypeScript (advanced)
  • Strong JavaScript fundamentals (async, modules, performance)
  • Experience with Vite, ESLint, modern tooling
  • Building scalable UI with components, hooks, and context
  • Integrating with REST APIs, async flows, error handling
  • Writing maintainable code + strong code review skills
  • Familiar with LLM-based features (streaming, prompts, AI-driven UI)
  • Testing with Vitest/Jest + React Testing Library
  • Good UX instincts & ability to work independently

Must-Haves if we consider full-stack, nice to have for frontend

  • Python backend familiarity (FastAPI/async I/O, API contracts)

Nice-to-Haves

  • Experience with Electron apps (main/renderer, preload, IPC)
  • React Query / Zustand or other state libraries
  • Advanced TypeScript patterns (generics, mapped types)
  • Performance debugging (React Profiler, bundle optimization)
  • Knowledge of Radix/shadcn/ui or similar component libraries
  • Node.js fundamentals
  • Event-driven systems familiarity

Benefits
  • Join a pioneering joint venture at the intersection of AI and industry transformation.
  • Work with a diverse and collaborative team of experts from various disciplines.
  • Opportunity for professional growth and continuous learning in a dynamic field.

Top Skills

Eslint
JavaScript
Node.js
Python
React
Rest Apis
Typescript
Vite
Am I A Good Fit?
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The Company
Hellerup
27 Employees

What We Do

Foundational AI trained on whole company data for task automation and value extraction.

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