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AI Architect

Job in Hemel Hempstead, Hertfordshire, HP3, England, UK
Listing for: The Citation Group
Full Time position
Listed on 2026-09-21
Job specializations:
  • Software Development
    AI Engineer (Applied/Software), Software Architect
Salary/Wage Range or Industry Benchmark: 90000 - 140000 GBP Yearly GBP 90000.00 140000.00 YEAR
Job Description & How to Apply Below

Role: AI Architect

Reports to: Chief AI Officer (line management)

Location in structure: AI/Data architecture area — embedded within the delivery area it serves, line-managing centrally to the Chief AI Officer

Experience: Senior — 6+ years in software, data, or platform engineering/architecture, with meaningful hands-on time on production AI systems, not just pilots

Direct reports: None. Influence comes from judgement and presence in the right conversations, not headcount.

Why this role exists

AI decisions at Citation now cut across Product, Engineering, Security, Infrastructure, and the Business simultaneously — model selection, data architecture, cost, and risk are no longer separable concerns. Without a dedicated architectural owner, each initiative makes these calls independently: patterns diverge, risk goes unspotted until it's expensive, and nobody owns the AI-specific decisions that don't belong wholly to any one function.

This isn't a hypothetical gap. Much of this work is already happening informally inside Citation's AI delivery — reviewing partner Statements of Work, governing what goes through Code Factory, acting as the practical architectural voice on live builds. This role formalises that into a mandate with the standing and scope it needs.

How this role sits in the architecture function

The AI Architect is Citation's dedicated architect for the AI/Data area, sitting alongside the architects covering Human Resources, Business Systems, Health & Safety, eLearning, Verification, Certification, and Atlas Platform: embedded in the delivery area it serves day to day, but line-managing centrally to the Chief AI Officer so its calls hold across the business, not just the team it happens to sit nearest to.

The architecture hub owns target-state and standards across the whole architecture function; this role owns the AI-specific application of it, escalating decisions with consequences beyond AI/Data to the Architecture Review Board rather than deciding them alone.

What good looks like

The clearest sign this role is working: AI initiatives at Citation start well and stay on track architecturally. In practice that means:

  • Established patterns are the default starting point for new builds, not something teams discover after the fact
  • Design questions are resolved before Engineering starts building, not during or after
  • Third-party Statements of Work are assessed architecturally before they're signed
  • Model and hosting choices are made against a documented decision framework, not habit or vendor pressure
  • Token spend and cost-per-outcome are tracked and explainable, not a surprise on the invoice
  • Security is involved in every significant initiative from the start, not introduced at the end
  • Leadership has a current, accurate view of AI architectural risk and direction, with no significant surprises
Responsibilities

Architectural standards and patterns

Own the design patterns Citation builds its AI systems to: retrieval and grounding approaches for systems that need Citation's own knowledge rather than a model's general training, agent orchestration patterns and tool-calling conventions for multi-step and multi-agent work, prompt construction and guardrail design, and the routing logic that decides which model handles which step. Keep these current as the landscape moves, and write decisions down in a form Engineering and Product can actually build against — architecture decision records, not a slide deck.

Align standards to Citation's five-layer AI platform architecture.

Model selection: open-weight vs. closed, and why

Hold a documented, evidence-based framework for choosing between closed frontier models accessed through a provider's API (Anthropic, OpenAI, Google) and open-weight models run on Citation's…

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