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Begin with relevant experience, not the size of the portfolio. Ask to see two or three engagements that sit close to your stack, and then find out which engineers actually built it. A solid partner will introduce you to the tech lead. Evasive answers at this stage usually mean the delivery team is not the team you were shown.

The paperwork warrants more scrutiny than the proposal. A few clauses carry most of the weight: ownership of the code, confidentiality, and notice periods and handover. All the work product has to transfer to you once invoices are settled, along with source code, designs and infrastructure as code. Look closely at wording that leaves so-called reusable libraries outside the transfer, as that is often the dependency that makes switching painful.

Ask where their numbers come from. A serious estimate comes with a written set of assumptions, a breakdown per feature and a best case and a worst case. A fixed-price contract only makes sense when the specification is complete; when the scope is still moving the provider adds a risk premium and you fund the buffer regardless. Time and materials moves the risk back to the client, so it needs a cap, regular demos and transparent reporting.

The delivery process matters as much as the number of hire react query developers. Ask what happens when the scope changes, who writes the acceptance criteria and how quality assurance works. A well-run team should be able to show you running software rather than status reports. Acceptance criteria in writing stay the practical protection against the it-was-never-in-scope conversation.

Finally, plan ecommerce solution for edtech industry the end of the engagement at the start rather than at the end. Insist that the source repository lives in your organisation from day one, and that documentation is updated as part of the work. A vendor with nothing to hide accepts it without argument; hesitation here says quite a lot.