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Senior Full Stack Engineer; Frontend Focus

Job in Neath, Neath Port Talbot, SA11, Wales, UK
Listing for: Complexio
Full Time position
Listed on 2026-02-16
Job specializations:
  • Software Development
    Full Stack Developer, Software Engineer
Job Description & How to Apply Below
Position: Senior Full Stack Engineer (Frontend Focus)

Senior Full Stack Engineer (Frontend Focus)

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 + Type Script (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 (full‑stack focus)
  • 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 Type Script 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
Job Details
  • Seniority level:
    Mid‑Senior level
  • Employment type:

    Full‑time
  • Industries:
    Technology, Information and Internet
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Position Requirements
10+ Years work experience
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