What a VMS is actually optimised for
Vendor management systems are very good at the things they were built to control. Engineering quality is not among them, and pretending otherwise is where programmes go wrong.
A vendor management system does several things extremely well. It gives procurement a defensible audit trail, enforces rate cards, standardises requisitions, tracks spend by cost centre, and ensures that every worker on site has been screened against the same criteria. For an organisation running several hundred contingent workers across a dozen suppliers, these are not trivial achievements. They are the difference between a programme and a liability.
The difficulty arises when the same system is expected to deliver an outcome it was never designed to produce: the right engineer for a hard problem. The VMS optimises for control, comparability and cost. Technical fit is not a field it can hold.
What comparability does to a requisition
For a system to compare suppliers fairly, roles must be described in commensurable terms. That produces requisitions built from standardised titles, years of experience, and a list of technologies — because those are the attributes a system can match against.
Everything that actually predicts success in a senior engineering role sits outside that vocabulary. Judgement under ambiguity, the ability to work in an unfamiliar codebase without breaking it, knowing which corners are safe to cut. None of it is expressible in a requisition template, so none of it is transmitted to the suppliers being asked to fill the role.
Suppliers respond rationally. They submit against the stated criteria, because the stated criteria are what the system scores. The engineer who would be excellent and has eight years rather than the specified ten is filtered before a human sees the profile.
Where the programme quietly loses
- Submission volume becomes the proxy for supplier quality, which rewards suppliers who submit widely rather than accurately.
- The hiring manager, who holds the only accurate picture of the role, is often furthest from the requisition text.
- Speed metrics measure time to fill rather than time to productive, so a fast placement that fails at week six scores better than a slower one that works.
- Rate becomes the primary differentiator once candidates are nominally comparable, which is precisely the effect the standardisation produced.
- Rejection reasons rarely travel back to the supplier in usable form, so the same mismatch recurs across the next four requisitions.
Using the system well
None of this is an argument against running a VMS. At scale the alternative — dozens of supplier relationships governed informally, with no consistent screening and no visibility of spend — is materially worse, and organisations that have lived through it do not want it back.
The correction is to stop asking the system to do the part it cannot. Let the VMS govern compliance, rate and process, and put a real conversation between the hiring manager and a small number of suppliers on the roles where technical judgement decides the outcome. Programmes that carve out that exception for their most consequential roles get both things: the control the organisation needs and the engineers the work requires.
Programmes that refuse the exception get consistency, comparability, and a steady supply of technically adequate people for problems that needed better than adequate.
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