Head of AI & Agent SystemsRemote role opportunity within the UK and/or Europe (EEU only)Must have a valid Right to Work either in Ireland or EEU.Principled is partnering with a pioneering Adtech company at the forefront of AI-driven automation. This organisation is building autonomous systems that plan, launch, and optimise performance marketing campaigns end-to-end, from on-brand creative and keyword expansion to smart bidding and ROI feedback loops. Their vision is to redefine how advertising operations scale through intelligent, agent-based automation.The RoleWe're leading the search for a Head of AI & Agent Systems, a senior technical leader who will own the company's AI strategy and deliver production-grade, multi-agent systems that drive measurable revenue impact across thousands of campaigns. This role offers high autonomy, broad technical depth, and the opportunity to shape the frontier of agentic adtech.What You'll DoLead AI roadmap, investment bets, and vendor/compute economicsEvolve a graph-based multi-agent platform (planner/solver/critic/guard) with memory, tool use, and streaming event loopsAdvance generation & recommendations (RAG, bandits/RL, causal uplift) and portfolio/bid optimizationArchitect multi-model routing, failover, caching/distillation, and cost governanceEstablish evals & reliability (benchmarks, canaries, A/Bs, rollbacks)Build and mentor a high-performing AI/ML teamEnsure brand safety, privacy, and Google Ads policy complianceWhat You've Done10+ years in AI/ML, including 5+ years leading teams of 10+ engineers.Proven experience shipping agentic or large-scale LLM systems in production.Strong Python and async/distributed systems expertise ( Ray, Celery, Kafka, or Redpanda ).Deep experience with LLMs, function calling, retrieval/memory, and multi-agent orchestration.Background in recommendations, NLP, optimisation, and experiment design; causal inference a plus.Familiarity with production monitoring/evaluation ( LangSmith, OpenTelemetry, W&B ) and cost optimisation.Bonus: experience with Google Ads API, streaming/online learning, AI safety/red-teaming, or model distillation.Technical EnvironmentModels: GPT-5 family, GPT-4o, Claude 3.x, Gemini 1.5, Llama 3.x + distilled smaller modelsInfra: Python, FastAPI, Redis, PostgreSQL/pgvector, Ray/Celery, Kafka/Redpanda, KubernetesMonitoring/Evals: LangSmith, OpenTelemetry, custom replay harnessesSuccess Looks LikeHigher ROAS and lower CPA across managed campaignsRising agent task success rates and reduced human interventionImproved compute efficiency, faster and safer deploys, and higher experiment velocityWhy This OpportunityCompetitive compensation + equityRemote-first with flexible work arrangements ( Only within the UK and/or EEU)Comprehensive benefits and professional development supportA rare chance to lead at the cutting edge of AI-driven automation in marketing technologyOur Application ProcessPrincipled Careers is managing recruitment for this role. We take a values-aligned, transparent approach and ensure candidates feel supported every step of the way. Expect a structured and respectful process, including an initial screen, technical or role-aligned assessment, and culture conversation.Apply now if you're ready to work at the intersection of Ad-technology or reach out to Principled Careers to learn more about similar opportunities.