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Complexio

Senior Full Stack Engineer (Frontend Focus)

Sorry, this job was removed at 10:18 a.m. (GMT) on Tuesday, Feb 24, 2026
Remote
Hiring Remotely in United Kingdom
Remote
Hiring Remotely in United Kingdom

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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.

What you need to know about the Belfast Tech Scene

If asked to name the birthplace of the RMS Titanic, you might not say Belfast. Similarly, if asked to name Europe's leading destination for foreign direct investment in new software development, Belfast might not come to mind. Yet, both are true. The city has emerged as a tech powerhouse, recently ranked among the best in the U.K. for tech careers — especially for software developers. It also leads the U.K. with the highest percentage of software development jobs advertised.

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