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The dominant factor is not the technology stack — it is almost always unclear scope. Each unanswered question in the brief becomes a contingency somewhere in the quote. A team that has no visibility into the edge cases must assume the worst. Spending a week on a discovery phase often reduces the total far more than any rate negotiation.

Integrations tend to be another reliable source of cost. A form that saves data is low risk; the same screen connected to a legacy ERP is not. The cost lives in the other system: poor documentation, long certification processes, inconsistent data. Ask any vendor spring boot vs symfony to price integrations separately, since this is the usual source of overruns.

The requirements nobody writes down can easily double the budget. A tool used by twenty people has almost nothing in common with the same feature set serving a hundred thousand users. Compliance work, uptime targets, performance under load, traceability and multi-language support each add measurable effort. Put them in the brief livewire or react expect them to arrive later as change requests.

The mix of people behind the number changes the arithmetic. A rate card tells you very little on its own: a senior engineer at a higher rate is often cheaper overall than a pair of junior developers who need constant review. Check too who else is billed: coordination, quality assurance, DevOps and UX design have to be done by someone, but they should be visible in the estimate.

The quoted figure is not the total cost. Budget for hosting, subscriptions and licences, observability and an ongoing software support company support budget annually. A useful planning figure holds that software in active use needs a recurring percentage of the initial investment every year for updates, security patches and small improvements. Ignoring this has always been the most frequent planning error.