A quote that comes back within a day should be treated as a red flag rather than good service. An experienced provider responds with clarifying questions before any number: about integrations. A provider that quotes without asking anything is simply pricing a guess, and that guess will be corrected later — at your expense.
Be wary of a gap between the engineers on the sales call and the people who will code. Request named engineers in the agreement, with wording covering replacement. A provider that talks only about roles and will not commit to individuals is reserving the right to assign anyone it likes.
Insist on access to the repository from the start. A team that delivers code only at milestones expects you to accept a black box. Regular commits and pull requests show you how many people are really working far better than any status report. The same holds for the automated test suite: if there is no pipeline, promises about quality remain just talk.
Vague contract language around code ownership is not an accident. The document should state in plain terms that the code, designs and moscow software development agency documentation belong to your business upon settlement of the relevant invoice. Also check the jurisdiction and the milestone terms: a request for most of the money up front with nothing due in return for custom ecommerce development services weeks removes the only leverage you have.
Finally, pay attention to how they communicate. Confirm how many hours there will be with your timezone, who handles questions and on what response times. Some genuine overlap is normally sufficient; no overlap stretches every clarification into a twenty-four hour round trip. Careless writing in the proposal does not improve under delivery pressure.