Complexio logo
Complexio

Complex made simple

Lead Full-Stack Engineer

Full-stack EngineerSoftware EngineerFull TimeRemoteSeniorTeam 11-50H1B No SponsorCompany SiteLinkedIn

Location

United Kingdom

Posted

93 days ago

Salary

0

Seniority

Senior

Bachelor Degree5 yrs expEnglish

Job Description

Lead Full-Stack Engineer

Complexio

• 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.

Job 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.

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