Lead Full-Stack Engineer

🕒 March 6

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Complexio

WebsiteLinkedInAll Job Openings

11 - 50 employees

🤖 Artificial Intelligence

☁️ SaaS

🏢 Enterprise

Artificial Intelligence • SaaS • Enterprise

Complexio is a company specializing in foundational artificial intelligence solutions designed for task automation using whole company data. Headquartered in London, they also have offices in Copenhagen and Monaco. Complexio is focused on leveraging AI technologies to enhance efficiency and automate processes within organizations. They prioritize data privacy and consent management, ensuring compliance with international data protection standards.

📋 Description

• Own the full frontend of Stevie's enterprise AI knowledge assistant. • Create user interfaces that enhance customer trust and value. • Shape the product direction and architectural decisions. • Collaborate with domain owners and engineers in a flat org structure. • Develop conversational AI interfaces, content feeds, document generation, and collaborative features.

🎯 Requirements

• 5+ years of frontend experience in production. You understand rendering models, performance characteristics, and architectural patterns deeply. • Strong product sense. You push back when the UX doesn't make sense. You've shipped real user-facing products. • Real-time/streaming UI experience. WebSockets, SSE, or similar live data patterns. • Comfort with ambiguity. You take vague problems and turn them into concrete frontend solutions. • You ship. End-to-end — prototype to production to iteration on feedback. • Enterprise/B2B SaaS. You know the difference between consumer UX and building for a CFO who needs to trust a number. • AI product experience. Latency UX, citation rendering, hallucination presentation. • Design sensibility. Polished interfaces without a designer in the room. • Backend literacy. You can read a REST API and collaborate with backend engineers on data contracts. • Startup experience. Small teams, multiple hats, fast without cutting corners.