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Look first at proven experience, not the length of the client list. Request a couple of engagements that match your stack, and then find out whether those engineers are still with the company. An honest provider will introduce you to the engineers. Answers that name nobody at this stage usually mean the demo work came from somewhere else.

The contract needs a slower read than the pitch. A few clauses carry most of the weight: intellectual property assignment, non-disclosure, llm application development and hire pyspark programmer exit terms and handover. Everything produced should transfer to you as it is paid for, along with designs, scripts and infrastructure configuration. Look closely at language that leaves so-called reusable libraries with the vendor, as that is often the dependency that makes switching painful.

Find out how the estimate was built. A credible estimate is accompanied by a list of assumptions, a breakdown per feature and a range rather than a single number. A fixed price is only reasonable when the specification is complete; otherwise the provider prices the risk in and you pay for uncertainty either way. A time-and-materials model shifts that risk to you, so it demands visible weekly reporting and a spending cap.

Process beats headcount. Ask what happens when the scope changes, who signs off on a feature and what the QA setup looks like. A well-run team will be able to show you a live build at the end of each sprint. Clear, written acceptance criteria stay your only real protection against an argument at delivery time.

Finally, think about the end of the engagement before it becomes urgent. Ask that the repository stays under your account from the first commit, and that a readme and architecture notes are kept current as the code changes. A partner who is comfortable with this accepts it without argument; a long negotiation over it reveals quite a lot.