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Senior Product Engineer (AI)

Plain· Product
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Hybrid (London)£90k - £140kFull-timePosted 11mo ago

About the role

Define how AI powers customer support.

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.
  • Have a 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 engineering (AI product shipping)LLM orchestrationRAG architectures
Nice to have:AI observability

Benefits

  • Competitive comp structure
  • Competitive salary, and a generous option grant on employee-friendly terms.
  • Team-wide offsites
  • Two global offsites per year in great locations, plus team-based offsites throughout the year.
  • Generous time off
  • 35 days annual leave - including public holidays - to take as you wish.
  • First Friday of the quarter off
  • 4 extra days off a year, a chance for all of us to recharge at the beginning of a quarter
  • Private Health Insurance
  • 100% employee coverage, dental and vision, access to out-of-network care. Also included: life insurance.
  • $100 Monthly Wellness Credit
  • Expense up to $100/month for your gym membership, ClassPass, monthly massage… you name it!
  • $1000 WFH stipend
  • One-time $1,000 to set up your workspace.
  • Retirement Planning
  • UK and Ireland: Employer matching up to 5%. USA: Contribute to your 401k pre-tax, with no employer match.
Last updated Oct 14, 2026. Interested? Apply on the company site.

About Plain

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