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Start with proven experience, not the size of the portfolio. Ask seo agency for saas a couple of projects that sit close to your stack, and then ask specifically who actually wrote that code. An honest provider will introduce you to the tech lead. Evasive answers at this stage almost always mean the demo work came from somewhere else.

The paperwork deserves more attention than the sales deck. A few clauses carry most of the weight: node js development services assignment of intellectual property, the NDA, and notice periods and handover. Everything produced must transfer to you once invoices are settled, together with source code, designs and infrastructure as code. Watch for any clause that leaves framework code with the vendor, since it is usually exactly the piece that locks you in.

Ask how they estimate. An honest estimate comes with a written set of assumptions, a breakdown per feature and a best case and a worst case. A fixed price works only when the scope is genuinely frozen; when the scope is still moving the provider pads the number and you pay for it anyway. Time and materials moves the risk back to the client, so it needs a sprint cadence, demos and a budget cap.

Process matters as much as headcount. Ask how change requests are handled, who writes the acceptance criteria and what the QA setup looks like. A team should be able to demonstrate running software rather than status reports. Clear, written acceptance criteria are the only reliable protection against endless rounds of rework.

Before signing, think about the day you no longer need this vendor while the relationship is still good. Require that the repository sits on infrastructure you own from day one, and that documentation is updated as part of the work. A vendor with nothing to hide will agree quickly; hesitation here reveals a great deal.