Complexio
Lead Full-Stack Engineer
Remote Frontend Development role with clear candidate location fit.
PostedJul 4, 2026
Eligible countries3 accepted countries
Seniority signalSenior
Work settingRemote
Accepted candidate locations
NetherlandsSpainUnited Kingdom
Role overview
Lead Full-Stack Engineer
Requirements and responsibilities
Readable role content extracted into sections for faster review.
Must-haves
- 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.
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