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The dominant factor is never technology — it is how much is still undecided. Each unanswered question in the requirements becomes padding in the estimate. A team that has no visibility into the exceptions and edge cases will assume a pessimistic case. Investing a few days in a proper discovery often reduces the total by far more than negotiating the rate.

Third-party integrations are the second big multiplier. A screen that writes to your own database is low risk; the same screen wired into a legacy ERP is a different problem. The effort hides in the counterparty: poor documentation, waiting on someone else's team, data that does not match your model. Ask the estimator to fixed price vs time and materials integrations separately, because this is the usual source of overruns.

The requirements nobody writes down quietly rewrite the estimate. An application used by twenty people is a very different build from the same idea handling public traffic. Security reviews, uptime targets, app store optimisation agency scalability, data retention rules and multi-language support all add measurable effort. State them early or else expect the estimate to move later.

The team you are quoted matters. An hourly rate reveals very little on its own: an experienced engineer at a higher rate is often cheaper overall than a pair of junior developers who require constant review. Also ask what else appears on the invoice: project management, b2b ecommerce development services testing, DevOps and design are legitimate costs, but they should be visible in the estimate.

The number in the proposal which is better monolith or microservices not the total cost. Budget for hosting, subscriptions and licences, observability and a maintenance allowance annually. A useful planning figure holds that software in active use requires a noticeable fraction of the initial investment every year in fixes, updates and small changes. Ignoring this has always been the most frequent planning error.