How to Choose a Smart Contract Development Company: A Buyer's Checklist

Evidence gates before the shortlist

A missing answer may be resolvable. Record it, name the person who will resolve it and avoid treating an unverified statement as a completed check.

Do not average an unresolved ownership issue into a high overall score. If a provider requires permanent production authority, determine why, what it can do and how that authority can be removed. A price discount does not settle that decision.

Trace a reference project to the work performed

Ask the provider to walk through one relevant delivery. Start with the source version, the deployed addresses and its exact contribution. A publicly visible contract may verify the existence of a deployment while proving nothing about who developed it.

Ethereum's source-verification documentation describes comparing source and build inputs with deployed bytecode. That correspondence does not attribute authorship or show that a particular company implemented every part of a product. An audit report likewise needs to be read for its scope and reviewed revision, not just its cover page.

Useful follow-up questions are specific: Which requirements changed after the first review? What did the provider implement? Who handled deployment? Which findings remained open? If the report names a commit, ask how later fixes and the deployed revision relate to it. When client confidentiality prevents sharing code, request a permitted reference conversation or a redacted delivery record.

Confidentiality should not be treated as proof either way.

Give a reference project credit for relevant evidence. A successful wallet integration is valuable work, but it does not demonstrate the same responsibilities as designing escrow state transitions and privileged payout functions.

Interview the people responsible for delivery

Ask the proposed technical lead to reason through your product's failure cases. For escrow, ask what happens if release is requested twice, a dispute begins near expiry or the approved asset transfer fails. The discussion should expose assumptions, including decisions the buyer still needs to make.

Tool names alone are weak evidence.

A useful test plan explains which properties will be checked and how the results will be reproduced. OWASP's Smart Contract Security Verification Standard provides a reference for EVM security requirements. Ask a provider which parts it will apply and what evidence it will deliver. Merely mentioning the standard does not establish certification or project compliance.

If the scope is unresolved, buy a bounded discovery deliverable before fixing the implementation price. That deliverable can include the state model and estimate assumptions. A paid exercise should have explicit reuse and access terms. Do not ask several vendors to build competing production implementations as unpaid selection work.

A filled smart contract RFP example

This fictional brief matches the baseline used in the smart contract development cost example. It is deliberately bounded so providers can explain deviations and price the same work.

Product and asset boundary. Build escrow contracts on one EVM network for one approved ERC-20 settlement asset. The buyer will select the network and asset before the implementation estimate is finalized. No arbitrary-token support, yield, oracle, bridge, frontend or backend is included.

Actors and flows. A payer funds an agreement and can authorize payment to its payee. A designated resolver handles disputed payouts according to agreed rules. An undisputed expiry has a defined refund path. Discovery must specify who can open a dispute, the exact deadline comparisons and which actions remain possible while paused. Terminal agreements must prevent repeat payment.

Architecture. Propose a fixed implementation without a proxy upgrade path. Describe administrative parameters and any replaceable dependencies. Price upgradeability separately if the provider recommends it, with the product reason and authority changes made explicit.

Required delivery. Provide the specification, permission register, source repository, locked build inputs, test suite, requirement/evidence matrix, internal review findings, release rehearsal and handoff runbook. Identify the artifacts supplied at each milestone.

Independent review. Quote external audit separately or identify the buyer's responsibility for procuring it. State the revision supplied for review, the included remediation allowance and how changed code is submitted for fix review. Keep unresolved findings in the release decision.

Ownership and access. Propose delivery through a buyer-controlled repository and define intellectual-property and third-party license terms. The buyer retains custody of production signing keys. Any temporary deployment or support role needs an approved purpose and a verified removal or transfer process.

Commercial response. Break pricing into requirements, architecture, implementation, tests, internal review, remediation, rehearsal and handoff. List assumptions and exclusions. Show dependencies on buyer decisions and external review separately from engineering effort. Identify who can approve a change request.

Acceptance. Demonstrate a reproducible build from the candidate revision. Link each agreed behavior to a test or other acceptance record. Review the role map and known limitations with the buyer before authorizing mainnet transactions. State who accepts the delivery and who authorizes deployment.

This is a starting brief, not a completed escrow specification. The unresolved dispute, deadline and pause rules are discovery outputs. Marking them explicitly lets a provider price discovery without quietly choosing business policy for the buyer.

Evaluate the response without hiding critical gaps

Use a status register with evidence links: evidenced, clarification required, excluded or unacceptable. A numeric score can help compare two viable proposals after the gates are resolved. The weights belong to your procurement decision and should reflect the product; they are not objective measures of safety.

Compare a provider's proposed milestones with the RFP. A generic statement about quality leaves the testing deliverable undefined, so ask for the missing acceptance evidence. For bundled audit work, request the reviewer and review boundary. A price based on a different asset or a proxy design also needs its scope aligned before the difference can be attributed to efficiency.

The testing and acceptance guide provides a matrix to attach to the statement of work. It defines what the buyer will inspect, so acceptance does not depend on whether a demonstration looks convincing.

Agree the handoff and ongoing authority

Source ownership, repository access and production authority are separate matters. Owning a repository does not revoke an admin key. Holding an admin key does not establish the right to reuse third-party code. Record each boundary in the appropriate agreement and technical handoff.

For every privileged action, identify its current controller, intended controller, removal method and verification evidence. OpenZeppelin's access-control documentation describes owner and role-based models; the provider should explain the actual model chosen for your contracts. Check operational authority against that design after deployment.

Specify who will respond to incidents, who pays for new features and how another team can resume maintenance. Before ending the engagement, have the receiving engineer reproduce the build and locate the live address register, role map and unresolved findings.

To compare Pharos on the same basis, use the RFP with our smart contract development service. Request a response against each deliverable and permission boundary, including any assumption that must be settled before the implementation scope can be priced.