| Who does the work | Certified engineers, or engineers who shipped inside Meta, Spotify, UBS and Starling Bank. Senior, hands-on, no bench of juniors. | A partner-led programme team, usually large and spanning several grades. | Engineers placed in your team and directed by your own managers. | Advisers who hand the build to your team or a delivery partner. |
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| Time to first production slice | Typically weeks. One real workflow, end to end, in your environment. | Set by the programme plan, which usually opens with discovery and mobilisation. | Set by your own plan and backlog, which the placed engineers work to. | Outside the scope. The deliverable is a strategy and roadmap. |
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| Model choice | From production evidence across OpenAI, Anthropic, Gemini and open-source, not from a vendor deal. | Advised by the firm's technology teams, often alongside its published alliances with the major vendors. | Your team's decision, informed by the experience of the engineers placed with it. | A recommendation, for the build team to test on the workload. |
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| Governance | Built as platform controls: default-deny access, permission-aware context, deterministic checks, human approval, evaluation gates in CI. | A governance workstream within the programme, covering policy, controls and oversight. | Yours to define, enforce and audit. | A framework, for your team or a delivery partner to implement. |
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| What you are left with | Running systems, the architecture written down, and a team that can extend both. | The delivered system and its documentation, with support and changes arranged under the contract. | The work in your own repositories, with handover arranged by your team. | A roadmap, ready to take into the build. |
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| Commercial shape | Fixed-scope statements of work, a retained implementation engagement, or embedded engineers from three months. One supplier, one contract. | Multi-phase programme against a rate card. | A rate per person, usually daily or monthly, for as long as the roles are needed. | Fixed fee for the report. |
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