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Senior Product Engineer (AI)

Plain· Engineering
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Hybrid (London office)Full-timePosted 11mo ago

About the role

Senior backend-focused product engineer focused on AI features, infrastructure, and data pipelines to power Plain’s AI-enabled customer support platform. Hybrid role in London with a strong emphasis on end-to-end ownership, scalability, and measurable user impact.

Responsibilities

  • Own and ship AI features such as our agents, assistants, insights and more - from concept to production.
  • Design and implement backend services for AI integrations and data pipeline.
  • Build robust APIs and abstractions for internal AI usage
  • Drive system scalability: caching, optimization, processing patterns, etc
  • Contribute and drive the evolution of the infrastructure for AI including architecture, evaluation and iteration pipelines.
  • Solve complex AI challenges around AI accuracy, reliability, and quality – using rigorous quantitive approaches.
  • Advocate for our work externally – writing, speaking, and engaging with the broader AI community.

Qualifications

  • Are an experienced backend engineer who’s shipped AI products in the OpenAI & Anthropic era – especially text and data-heavy AI applications.
  • Hands-on experience with LLM orchestration and LLM API optimization (costs, latency, etc)
  • Familiar with RAG architectures and technologies
  • AI observability experience
  • Clear perspective on what makes a great AI product
  • Product minded and customer focused in how you build software
  • Measure your success by user impact, not just technical elegance
  • Self-driven, impact-focused, and thrive in a fast-moving, high-ownership environment
  • Bonus: experience with agent frameworks and design.

Skills

Required:Backend engineeringLLM orchestrationRAG architecturesAI observability
Last updated Sep 3, 2026. Interested? Apply on the company site.

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