Most blockchain projects that go over budget were under-planned, not badly coded. Here is what I'd settle on before hiring anyone.

The problem: Write one sentence on what the blockchain fixes. If a normal database does the job, use one. Blockchain earns its place when several parties need a shared record they all trust, or when assets need to move without a middleman.

The users and rules: Decide who can join, who can see what, and who can approve or reverse actions. These choices drive the design more than the technology does.
The chain: Public, private or permissioned each trade off cost, privacy and control. Pick based on your users, not on what's popular.

Legal and compliance: If the product touches money, identity, or investor assets, check the rules for your market early. Data protection, financial regulation, and licensing can change the whole build. Fixing this after launch costs far more.

Security: Budget for an independent smart contract audit and plan a re-audit whenever the code changes.
Integrations: Most platforms need to connect to banks, KYC tools, wallets, or existing software. List them upfront.

After launch: Decide who monitors, updates, and supports the system. Many teams forget this line item.

A small first release: Launch the smallest useful version, learn from real users, then expand.
If you're comparing teams, ask who handles the legal and operational side, not to think about the coding side. InnBlockchain is a renowned blockchain solutions provider and is a good place to start your custom blockchain development in your niche without any second thoughts.

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