About H:
H exists to push the boundaries of superintelligence with agentic AI. By automating complex, multi-step tasks typically performed by humans, AI agents will help unlock full human potential.
H is hiring the world’s best AI talent, seeking those who are dedicated as much to building safely and responsibly as to advancing disruptive agentic capabilities. We promote a mindset of openness, learning and collaboration, where everyone has something to contribute.
Holistic, Humanist, Humble.
Key Responsibilities:
Own the full orchestration stack that connects tools (via MCP), RAG systems, browsing agent and more into fluid workflows
Design, build, and scale LLM-powered backend systems that drive autonomous, goal-driven behavior
Collaborate closely with researchers and product designers to ship fast, iterate, and deliver agentic UX
Maintain and evolve a fast, clean front-end in Next.js for agent interaction and control
Optimize performance, routing, and observability across a multi-agent system
Requirements :
5+ years of experience, including time in a fast-moving AI startup
Deep backend engineering expertise (Python, APIs, async orchestration)
Strong frontend experience (Next.js + TypeScript)
Experience with LLM-native architectures: prompt engineering, RAG, tool use
Familiarity with vector databases, embedding models, and retrieval systems
Ability to make architectural decisions and ship autonomously
Location
H’s teams are distributed throughout France, the UK, and the US.
This role may be fully remote or hybrid for candidates based in cities where we have an office currently Paris and London.
The final setup will be determined with the hiring manager.
What We Offer
A front-row seat in one of the most ambitious AI startups
The opportunity to shape the future of agentic AI through highly visible, performance-driven work
Competitive salary and equity
A fast-moving, highly collaborative environment working alongside world-class teams
Clear pathways for personal growth, experimentation, and leadership
If you're driven by performance, passionate about advertising, and eager to build something transformative, we’d love to hear from you.
