Senior Full Stack Engineer (Frontend Focus)

Complexio

United Kingdom Remote permanent

Posted: December 3, 2025

Required Skills

Job Description

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.

Why Apply Through MisuJob?

AI-Powered Job Matching: MisuJob uses advanced artificial intelligence to analyze your skills, experience, and career goals. Our matching algorithm compares your profile against thousands of job requirements to find positions where you have the highest chance of success. This saves you hours of manual job searching and ensures you only see relevant opportunities.

One-Click Applications: Once you create your profile, applying to jobs is effortless. Your resume and cover letter are automatically tailored to highlight the most relevant experience for each position. You can apply to multiple jobs in minutes, not hours.

Career Intelligence: Beyond job matching, MisuJob provides valuable career insights. See how your skills compare to market demands, identify skill gaps to address, and understand salary benchmarks for your experience level. Make data-driven decisions about your career path.

Frequently Asked Questions

How do I apply for this position?

Click the "Register to Apply" button above to create a free MisuJob account. Once registered, you can apply with one click and track your application status in your dashboard.

Is MisuJob free for job seekers?

Yes, MisuJob is completely free for job seekers. Create your profile, get matched with jobs, and apply without any cost. We help you find your dream job without any hidden fees.

How does AI matching work?

Our AI analyzes your resume, skills, and experience to understand your professional profile. It then compares this against job requirements using natural language processing to calculate a match percentage. Higher matches mean better fit for the role.

Can I apply to jobs in other countries?

Absolutely. MisuJob features jobs from companies worldwide, including remote positions. Filter by location or look for remote opportunities to find jobs that match your preferences.

Ready to Apply?

Join thousands of job seekers using MisuJob's AI to find and apply to their dream jobs automatically.