A number produced without questions should be treated as a bad sign. A competent team returns clarifying questions before any number: about who owns the data and real estate software development services what happens on failure. A vendor that prices without asking anything is probably guessing, and a guess will be corrected later — at your expense.
Watch for any distance between the people you meet and those who eventually appear software development companies in united kingdom the repository. Insist on specific people rather than roles in the agreement, with a clause that requires notice before anyone is swapped. A vendor that only offers roles and refuses to name individuals is keeping the option to staff you with whoever is free.
Insist on the source repository from day one. A team that shows code only at milestones expects you to trust a black box. Regular commits and pull requests reveal how many people are really working far better than any status report. This extends to the build and deployment setup: if nothing runs automatically, assurances about quality remain unverifiable.
Loose phrasing around intellectual property is rarely an accident. The document must state in plain terms that all outputs produced under it transfer to your nextjs development company as they are paid for. Look too at the governing law and how payments are structured: a large upfront payment with nothing due in return for weeks takes away your only leverage.
Finally, examine communication. Establish how many hours the teams will share with your working day, which named person answers questions and on what response times. Four hours of overlap generally works; none at all turns every clarification into a day of delay. Unclear written communication in the sales phase rarely improves under delivery pressure.