What Actually Drives Software Development Costs

The dominant factor is rarely the choice of framework — it is uncertainty. Every ambiguity in the specification is converted into padding somewhere in the quote. A supplier that has no visibility into what happens on the unhappy path has to assume a pessimistic case. Spending a week on a proper discovery often reduces the final cost by far more than haggling over hourly rates.

Integrations tend to be the next major multiplier. A feature that touches only your own data is predictable; the same feature talking to a payment provider and a CRM is not. The effort lives in the third party: undocumented APIs, long certification processes, inconsistent data. Ask any vendor to list every external system, livewire vs vue comparison because that is where the numbers slip.

The requirements nobody writes down silently change the number. A tool used by a small internal team is a very different build from the same feature set handling thousands of external customers. Security reviews, uptime targets, scalability, audit logging and localisation each add real engineering time. Put them in the brief or react vs vuejs expect the estimate to move later.

The team you are quoted matters. A rate card reveals little on its own: an experienced engineer at a higher rate can be cheaper per delivered feature than two juniors who need heavy code review. Also ask which roles are billed: delivery management, QA, DevOps and UX design are real work, but they must be named rather than hidden inside a blended rate.

The quoted figure is not the full cost of ownership. Expect infrastructure, paid APIs, monitoring and a maintenance allowance each year. A reasonable rule of thumb holds that software in active use requires a recurring percentage of its original build cost annually in fixes, updates and small changes. Leaving it out of the budget is the most common budgeting mistake.