Head of Agent Architecture
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Job Description
Head of Agent Architecture building scalable GenAI advertising systems for Pencil, an AI-powered advertising SaaS company. Leading agent strategy, reusable frameworks, client deployments, and an Agent Architecture team.
Responsibilities:
- Define Pencil’s technical vision and roadmap for agent architecture, including multi-agent workflows, task decomposition, state management, and tool use
- Hire, mentor, and manage a small team of Agent Architects
- Set technical standards, provide real-time feedback, and run development conversations
- Use and champion evaluation frameworks to measure agent performance
- Own reusable agents and prompt libraries serving 1,000+ brands with unique voices
- Decide what should be built as reusable platform functionality versus bespoke work
- Partner with AI Engineering, Product, and Sales/Client leadership on prompting, RAG, and fine-tuning decisions
- Serve as the final technical escalation point for complex client deployments
- Lead discovery for high-stakes engagements and translate ambiguous client problems into buildable agent workflows
- Present cost, latency, and reliability trade-offs to senior non-technical stakeholders
- Represent Pencil’s agent technology with brand and agency stakeholders
- Establish standards for decomposing client problems and explaining complex technical decisions in plain language
- Drive system reliability, architectural efficiency, brand alignment, adoption at scale, client deployment success, stakeholder trust, and team growth
Requirements:
- 8+ years of direct GenAI experience
- 2+ years leading people or a function
- Deep technical fluency with LLMs including GPT-4, Claude, and Gemini
- Experience with multimodal models including Stable Diffusion, Midjourney, and video generation
- Track record managing engineers or architects, or owning a function’s roadmap and outcomes
- Systems thinking across latent space, context windows, and multi-agent inputs and outputs
- Comfortable with Python, JSON structures, and API documentation
- Experience with agent orchestration patterns such as task decomposition, tool use, and state management
- Experience building or running benchmarking and A/B testing practices
- Experience hiring and growing technical people, or owning a roadmap with stakeholder pressure
- Ability to set strategic vision, gain senior leadership approval, and hold a team accountable
- Demonstrated experience leading discovery with senior customers or stakeholders
- Ability to turn vague briefs into scoped technical solutions
- Background in solutions architecture leadership, forward-deployed engineering, or technical consulting is suitable
- Ability to explain agent failure modes, evaluation results, and architectural trade-offs to non-technical stakeholders without jargon
- Ability to translate creative direction into concrete system changes
- Comfortable representing technology in client meetings
Benefits:
- 25 days PTO plus public holidays, although we operate a Flexible Time Off scheme
- Health insurance / private medical cover
- Monthly stipend towards wellness, fitness, and learning and development
- Remote - work from anywhere in your home country
- Enhanced parental leave policies, whether you become a parent through birth, adoption or surrogacy
- Access to our Pencil office in The Shard, London for UK employees
- Flexible working hours
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