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Begin with domain experience, symfony web development not the length of the client list. Ask to see a couple of projects that sit close to your technology stack, and outsource ecommerce development then ask specifically which engineers actually built it. A serious vendor will introduce you to the people who would work on your project. Evasive answers at this stage usually mean you are talking to a reseller.

The paperwork needs more scrutiny than the proposal. A few clauses carry most of the weight: intellectual property assignment, the NDA, and exit terms and handover. Every artifact must transfer to you on payment, together with source code, designs and infrastructure as code. Watch for wording that leaves reusable components in the vendor's hands, as that is often the dependency that makes switching painful.

Ask how they estimate. A credible estimate arrives with a list of assumptions, a breakdown by feature or module and a best case and a worst case. A fixed-price contract is only reasonable when the scope is genuinely frozen; in any other case the provider prices the risk in and you pay angular programmers for hire uncertainty either way. A time-and-materials model moves the risk back to the client, so it requires a sprint cadence, demos and a budget cap.

Process beats the number of developers. Find out how a new requirement enters the plan, who signs off on a feature and how testing is organised. A mature team can demonstrate running software rather than status reports. Written acceptance criteria are your only real protection against endless rounds of rework.

Last, consider the handover before it becomes urgent. Require that the source repository sits in your organisation from the first commit, and that documentation is updated as part of the work. A vendor with nothing to hide says yes immediately; a long negotiation over it says quite a lot.