An estimate that arrives instantly counts as a bad sign. Any serious team responds with a list of questions: about users and volumes. A vendor that prices with no clarification is probably working from a template, and the gap will be corrected later — at your expense.
Look out for a mismatch between the team in the pitch and the developers actually assigned. Insist on named engineers in the contract, with wording about substitutions. A team that will only describe a pool of resources and refuses to name specific engineers is keeping the right to assign anyone it likes.
Require commit-level visibility from the first week. A team that shows code only at milestones is asking you to take delivery on faith. Regular commits custom fintech and crypto software development pull requests show you how many people are really working far better than a weekly report. The same applies to the automated test suite: if there is no pipeline, quality claims are unverifiable.
Vague phrasing around IP is never an accident. The agreement must state explicitly that the code, designs and documentation belong to the client upon settlement of the relevant invoice. Check also which country's law applies and the payment schedule: a request for most of the money up front with nothing due in return for weeks takes away any leverage you would otherwise keep.
Last, custom software vs saas examine how they communicate. Ask how many hours the teams will share each day, swift app development company which named person answers your questions and within what time. Some genuine overlap generally works; zero overlap stretches each small question into a lost day. Sloppy written English in the proposal will not improve later.
