Commercial understanding
A strong software delivery partner talks about business outcomes and trade-offs before it talks about technology stacks. Listen for what the team asks you first. If they want to know how a project slip affects your revenue and which deadline matters to the business, they're thinking about what the build is meant to change commercially. If they only ask for a feature list, they're thinking about their invoice.
Ask directly: what happens to our numbers if this launches three months late? A team with commercial understanding will probe the answer with you and adjust the plan around it. An evasive team will nod and return to the feature list. The difference tells you whether they see the build as your investment or their contract.
Technical questioning
A serious custom software development agency pushes back. It asks hard questions about integrations and data quality. It also probes edge cases and disagrees with you when your assumptions don't hold. That challenge is a good sign, while a team that agrees with everything during sales is optimising for the close.
Healthy challenge is specific. "How does this behave when the payment provider times out?" or "That integration assumes clean data from your CRM, and it isn't clean, so how do we handle that?" If nobody on the other side of the table ever says "that will be harder than you think," you're not talking to people who have shipped much.
Delivery governance
Governance is how the custom software development agency handles change once the build is underway, and it's where scope creep and budget disputes begin.
Ask to see the artifacts that keep that under control:
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A change request process where every change is priced and approved before it's built
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Sprint or fortnightly progress reporting that shows what was built and what it cost. It also states what's next.
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A named person you talk to when something slips, and a defined escalation path
Worst overruns tend to happen on projects with incoherent checkpoints, where months passed before anyone noticed trouble. Short feedback loops surface the problem in week two instead of month nine. Thin or informal governance is the opposite, and it's where budgets quietly break.
QA standards
A real quality approach shows up in the staffing plan. Look for test engineering as a named role and a stated position on automated testing versus purely manual checks. A proposal with no quality assurance (QA) strategy at all is a common and dangerous blind spot, because finding and fixing bugs is the single largest expense in the software lifecycle. The Consortium for Information and Software Quality put the cost of poor software quality in the US at $2.41 trillion.
You don't need to understand the tooling to ask a useful question. Try this: how will you prove to me that a new feature hasn't broken an old one?
Documentation and ownership
Confirm in writing who owns the code and the intellectual property when the project ends. The agreement also addresses architecture documentation. Without an explicit IP assignment clause, the vendor may retain ownership by default under copyright law in many jurisdictions, even though you paid for the work. Ownership also extends beyond code to project infrastructure and access.
The bigger risk is being held hostage by your own supplier. When a system can only be maintained by one person or a small group who keep the knowledge in their heads, switching partners becomes a separate project with its own cost and timeline. Usable documentation is a form of insurance. It's the thing that lets your internal team, or a future software delivery partner, pick up the work without starting over. Ask to see a sample of the documentation the custom software development agency delivers, not a promise that it exists.
