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Start with domain experience, not the size of the portfolio. Ask to see a couple of case studies that sit close to your stack, and then find out who actually wrote that code. A solid partner will put you on a call with the engineers. Answers that name nobody at this stage almost always mean the demo work came from somewhere else.

The contract deserves more scrutiny than the proposal. A few clauses carry most of the weight: outsource python development ownership of the code, the NDA, and notice periods and handover. All the work product must transfer to you as it is paid for, along with documentation, pipelines and deployment scripts. Watch for wording that keeps framework code with the vendor, as it is usually the part you cannot replace later.

Find out how the estimate was built. A credible estimate comes with a written set of assumptions, a task-level breakdown and an explicit range. A fixed price is only reasonable when the specification is complete; when the scope is still moving the supplier prices the risk in and you fund the buffer regardless. A time-and-materials model shifts that risk to you, so it needs visible weekly reporting and a spending cap.

The delivery process matters more than the number of developers. Establish how change requests are handled, who signs off on a feature and how testing is organised. A team can demonstrate running software rather than status reports. Clear, kotlin app development company written acceptance criteria are the practical protection against an argument at delivery time.

Before signing, consider the handover while the relationship is still good. Ask that the repository lives in your organisation from the beginning, and that the documentation is refreshed in every sprint. A vendor with nothing to hide accepts it without argument; a long negotiation over it tells you most of what you need to know.