The dominant factor is rarely the technology stack — it is how much is still undecided. Each unanswered question in the specification is converted into padding in the estimate. 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 can cut the overall figure much more than any rate negotiation.
Third-party integrations tend to be the next major multiplier. A form that saves data is easy to estimate; the same screen wired into a legacy ERP is another matter entirely. The unknown sits in the other system: rate limits and sandbox access, long certification processes, inconsistent data. Ask each bidder to list every external system, since this is the usual source of overruns.
The requirements nobody writes down can easily double the estimate. An application used by twenty people is a very different build from the same feature set serving public traffic. Security reviews, uptime targets, load handling, audit logging and localisation all add measurable effort. State them early or expect them to arrive later as change requests.
The team you are quoted changes the arithmetic. An golang developer hourly rate rate says almost nothing on its own: an experienced engineer at a higher rate frequently turns out to be cheaper per delivered feature than a pair of junior developers who require supervision and rework. Ask as well which roles are billed: delivery management, QA, release engineering and design are real work, but they should be itemised.
The build price is never what you will actually spend. Budget for infrastructure, paid APIs, observability and a maintenance allowance for every year the custom affiliate tracking software runs. A reasonable rule of thumb holds that software development for fintech in active use needs a meaningful share of the initial investment per year in fixes, updates and small changes. Leaving it out of the budget remains the most common budgeting mistake.
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