Lead Full-Stack Engineer
ComplexioSpain
Posted March 6, 2026
Full Time
About the Company
Complexio is building Stevie — an enterprise AI knowledge assistant.
Job Description
Lead Full-Stack Engineer responsible for owning the full frontend of Stevie, an enterprise AI knowledge assistant, and shaping the product direction and architectural decisions. Key responsibilities include designing and building conversational AI interfaces, content feeds, document generation, and collaborative features, with a focus on real-time/streaming UI experience and enterprise/B2B SaaS requirements.
Requirements
- 5+ years of frontend experience in production
- Strong product sense
- Real-time/streaming UI experience
- Comfort with ambiguity
- Strong signals in enterprise/B2B SaaS, AI product experience, design sensibility, backend literacy, and startup experience