Begin with domain experience, not the size of the portfolio. Request a couple of projects that resemble your stack, and then ask specifically which engineers actually built it. A solid partner will put you on a call with the people who would work on your project. Evasive answers at this stage generally mean you are talking to a reseller.
The paperwork deserves more attention than the sales deck. Three clauses do most of the work: ownership of the code, non-disclosure, and termination and handover. All the work product must transfer to you on payment, together with documentation, pipelines and deployment scripts. Be careful with wording that keeps reusable components in the vendor’s hands, since this is frequently the part you cannot replace later.
Ask how to choose a software developer they estimate. An honest estimate arrives with the assumptions behind it, a breakdown by feature or module and an explicit range. A fixed-bid deal works only when the scope is genuinely frozen; when the scope is still moving the supplier pads the number and you pay for it anyway. flutter developer hourly rate billing moves the risk back to the client, so it demands a cap, regular demos and transparent reporting.
The delivery process beats the number of developers. Find out what happens when the scope changes, who defines done and how quality assurance works. A well-run team should be able to show you running affiliate software development company rather than status reports. Acceptance criteria in writing are the only reliable protection against the it-was-never-in-scope conversation.
Finally, consider the handover while the relationship is still good. Ask that the code repository lives on infrastructure you own from the beginning, and that a readme and architecture notes are kept current as the code changes. A provider confident in its own work accepts it without argument; hesitation here says quite a lot.
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