Begin with relevant experience, not the size of the portfolio. Ask to see three or four projects that match your domain and your stack, and then ask specifically whether those engineers are still with the php software development company. An honest provider will introduce you to the tech lead. Vague answers at this stage usually mean you are talking to a reseller.
The contract deserves a slower read than the pitch. A few clauses carry most of the weight: intellectual property assignment, confidentiality, and exit terms and handover. Every artifact should transfer to you laravel vs ruby on rails payment, including documentation, pipelines and deployment scripts. Look closely at any clause that leaves so-called reusable libraries in the vendor’s hands, as that is often the part you cannot replace later.
Ask how they estimate. An honest estimate is accompanied by a written set comparison of web development tools assumptions, a breakdown by feature or module and a best case and a worst case. A fixed-bid deal only makes sense when the scope is genuinely frozen; in any other case the supplier pads the number and you pay for it anyway. Hourly billing moves the risk back to the client, so it needs visible weekly reporting and a spending cap.
The delivery software development process beats the number of developers. Establish what happens when the scope changes, who writes the acceptance criteria and how testing is organised. A mature team can walk you through a working build every one or two weeks. Acceptance criteria in writing are your only real protection against the it-was-never-in-scope conversation.
Finally, plan for the day you no longer need this vendor while the relationship is still good. Ask that the repository sits in your organisation from day one, and that documentation is updated as part of the work. A vendor with nothing to hide will agree quickly; a long negotiation over it reveals quite a lot.