Head of Engineering 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. Responsibilities Own, review, and challenge the end-to-end architecture of our product and research stack, including inference systems and the agent platform. Scale and lead the Product Engineering, Infrastructure, and Inference teams, with clear ownership, execution rigor, and strong technical standards. Partner closely with Product, Research, and Leadership to translate strategy into reliable, scalable systems. Must-have experience Proven track record building and scaling a production SaaS platform. Strong hands-on experience with AWS, Docker, Kubernetes, Redis, and modern observability tooling (e.g. Datadog). Exposure to MLOps, large-scale model training, inference systems, or LLM-based reinforcement learning. Experience operating multi-tenant systems with high reliability, security, and performance. Experience building and deploying enterprise platforms self-hosted or on-premise. Familiarity with SOC 2 or similar compliance frameworks in a production environment. Nice-to-have experience Experience orchestrating compute-intensive workloads (training and/or large-scale inference). Familiarity with workflow orchestration platforms. Location: Paris or London. This role is hybrid, and you are expected to be in the office 3 days a week on average. Please expect some travel between offices on a reasonable cadence (e.g., every 4-6 weeks). What We Offer: Join the exciting journey of shaping the future of AI, and be part of the early days of one of the hottest AI startups. Collaborate with a fun, dynamic, and multicultural team, working alongside world-class AI talent in a highly collaborative environment. Enjoy a competitive salary. Unlock opportunities for professional growth, continuous learning, and career development. If you want to change the status quo in AI, join us.