Summary: Complexio is seeking a Senior or Lead Frontend Engineer to own the frontend of Stevie, an enterprise AI knowledge assistant, shaping its product direction and architectural decisions. Highlights: 1. Own the full frontend with real influence on product and architecture 2. Create new enterprise AI UX patterns, not copy existing ones 3. Work in a flat organization with direct communication and ownership Complexio is building Stevie — an enterprise AI knowledge assistant that gives executives and operators a complete view of their organization through knowledge graphs. Our customers are large maritime shipping companies managing hundreds of vessels, thousands of daily emails, and complex commercial operations. We're looking for a Senior or Lead Frontend Engineer to own Stevie's frontend. The interface is the product — it determines whether enterprise customers trust the intelligence, get value quickly, and come back. You'll shape all of that. **Why This Role** Enterprise AI UX is unsolved. You won't copy patterns — you'll create them. Citations from knowledge graphs, streaming AI responses that feel trustworthy, confidence indicators on operational intelligence. You own the full frontend. No separate frontend team. You are it — with real influence on product direction and architectural decisions. Flat org, real impact. Domain owners have authority. Engineering decisions are made by engineers, not managers. You'll own the full frontend — conversational AI interfaces, content feeds, document generation, collaborative features. The product is evolving fast and you'll shape what gets built and how. **Requirements** Must\-haves 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. Strong signals * 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. How We Work * Direct communication. Honest feedback, hard questions, no hiding behind process. * Ownership over tasks. You're asked what you shipped and learned, not to fill out status reports. * Speed with quality. We ship fast because we scope well. Customer feedback cycles are weeks, not quarters. * AI\-augmented workflow. We use AI tools extensively and expect you to be comfortable with AI\-assisted development.