A number produced without questions should be treated as a red flag rather than good service. A competent team returns a list of questions: about users and volumes. A provider that prices before understanding the scope is probably pricing a guess, and a guess will be corrected later — at your expense.
Look out technology stack for web apps dedicated teams web development any distance between the dedicated team model vs project-based outsourcing in the pitch and the people who will code. Ask for named engineers in the agreement, with a provision covering replacement. A provider that talks only about abstract roles and refuses to name specific engineers is preserving its own flexibility at your cost.
Require commit-level visibility from the first week. A team that delivers nothing between demos is asking you to trust a black box. Regular commits and pull requests show you who is really on the project far better than any status report. This extends to the automated test suite: if nothing runs automatically, promises about quality are just talk.
Ambiguous phrasing around code ownership is rarely a formality. The contract needs to state plainly that all outputs produced under it belong to the client on payment. Check also which country's law applies and igaming software developer how payments are structured: a request for most of the money up front with no deliverable attached removes your only leverage.
Finally, look at how they communicate. Establish how many hours there will be each day, who answers questions and within what time. A few hours of overlap generally works; no overlap stretches each small question into a day of delay. Sloppy written English in the proposal will not improve under delivery pressure.