An estimate that arrives instantly is a red flag rather than good service. Any serious team returns a list of questions: about users and volumes. A vendor that commits to a figure without asking anything is probably pricing a guess, and react development company the gap becomes a change request later — on your budget.
Watch for a gap between the team in the pitch and those who eventually appear in the repository. Insist on specific people rather than roles in the statement of work, with wording covering replacement. A team that will only describe abstract roles and flutter development company refuses to name individuals is preserving its own flexibility at your cost.
Insist on the source repository from the first week. A team that hands over code only at milestones is inviting you to take delivery on faith. Daily commits tell you how many people are really working far better than any status report. The same holds for the automated test suite: if nothing runs automatically, quality claims are just talk.
Ambiguous contract language around intellectual property is not an accident. The document needs to state software development companies in russia plain terms that the code, designs and documentation become the property of your business on payment. Check also the governing law and .net core cross-platform development how payments are structured: heavy prepayment with nothing due in return for weeks eliminates any leverage you would otherwise keep.
Finally, examine the working rhythm. Confirm how much working-time overlap the teams will share with your timezone, which person answers day-to-day questions and how quickly. A few hours of overlap is usually enough; no overlap stretches each small question into a lost day. Sloppy written English in the proposal will not improve later.