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Begin with proven experience, not the size of the portfolio. Ask to see three or four projects that sit close to your domain and your stack, app development cost and then ask specifically which engineers actually built it. A serious vendor will introduce you to the tech lead. Evasive answers at this stage generally mean you are talking to a reseller.

The agreement needs more attention than the sales deck. Three sections matter more than the rest: intellectual property assignment, non-disclosure, and software outsourcing blog notice periods and handover. All the work product must transfer to you on payment, along with documentation, pipelines and deployment scripts. Be careful with language that keeps so-called reusable libraries in the vendor's hands, since that is often the part you cannot replace later.

Find out how the estimate was built. A serious estimate is accompanied by a list of assumptions, a task-level breakdown and a range rather than a single number. A fixed-price contract is only reasonable when the requirements are stable and documented; otherwise the supplier prices the risk in and you pay for it anyway. Time and materials puts the risk on your side, so it needs a cap, regular demos and transparent reporting.

Process matters as much as the number of developers. Establish how change requests are handled, who defines done and enterprise application development with java how testing is organised. A mature team can show you a live build at the end of each sprint. Acceptance criteria in writing stay your only real protection against an argument at delivery time.

Last, custom web and saas development consider the day you no longer need this vendor while the relationship is still good. Insist that the source repository stays under your account from day one, and that documentation is written as you go rather than left to the end. A partner who is comfortable with this will agree quickly; a long negotiation over it tells you quite a lot.