Choose a custom software development company by defining the outcome, constraints, and acceptance conditions first, then comparing every candidate against the same evidence-based criteria. Look beyond proposals: verify the people who would do the work, assess their delivery and security practices, account for accessibility and ongoing costs, and settle ownership and handover terms in the contract.
1. Define the work and how you will judge proposals
Before taking sales meetings, write a brief that gives each company the same basis for proposing. Describe the problem to solve, the people who will use the software, required capabilities and integrations, relevant data sensitivity, and constraints such as existing systems or operating requirements. Separate must-haves from preferences, and state what will count as an acceptable result.
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Set evaluation criteria before proposals arrive. For each criterion, decide what evidence would merit a strong, partial, or weak rating; this makes the comparison more consistent than relying on an overall impression. Include the perspectives needed for this project, such as business or product, technical, procurement, security, and accessibility expertise.
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2. Verify the team and its ability to deliver
Ask candidates to map their proposed approach to your requirements and show relevant completed work. Similarity matters: experience with your domain, scale, integrations, and operating constraints is more informative than a general portfolio of unrelated projects.
- Ask who would fill each key role, what skills they bring, and how much time they are expected to commit.
- Ask how work is planned, reviewed, tested, released, documented, and handed over.
- Ask how the company estimates changes and handles disagreements about scope or acceptance.
- Check references against concrete questions: Were agreed requirements met? How did schedule and quality compare with expectations? Were technical and operational needs addressed?
- If a company presents a credential or process appraisal, establish whether its scope applies to the organization and delivery unit proposing for your project.
NASA identifies staff skills, past performance, customer satisfaction, technical approach, domain expertise, delivery processes, and engineering and management capability as possible selection considerations. A polished proposal or company-wide credential alone does not establish that the proposed team has the relevant capability.
3. Assess security and privacy against your actual risks
Make the questions specific to the data, access, service, and likely impact of a security failure. Ask what information the supplier needs; who can access it; where development and test environments run; how credentials and permissions are controlled; how third-party dependencies are managed; and how vulnerabilities and incidents are reported, fixed, and communicated.
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CMS acquisition guidance offers a government-specific example of how requirements can reflect the service, data sensitivity, vendor access, and known provider or solution risks. CMS also says its systems may not use live production data for development or testing unless explicitly approved and documented, with production-level security and privacy controls. Those are CMS requirements, not universal rules; use the example to decide what data-handling terms your own organization needs.
4. Set accessibility expectations before proposals
If people with disabilities will use the software, or an accessibility obligation applies to your organization, state the requirement in the solicitation rather than waiting until the product is built. Identify applicable standards and any known exceptions, and tell companies what evidence and response format to provide. Ask for an accessibility conformance report or other suitable evidence, and establish how accessibility will be evaluated and accepted.
Section508.gov advises buyers to state accessibility requirements up front, distinguish standard from customized information and communication technology, document applicable requirements and exceptions, and explain how offerors should respond. Its Revised 508 Standards requirements apply to covered U.S. federal ICT; a private-sector buyer should determine which obligations apply to its own project.
5. Compare the whole cost, not just the build estimate
Ask each company to identify the assumptions behind its estimate, what is included in quality assurance and release work, how scope changes are priced, and what ongoing maintenance, hosting, support, and upgrades would involve. Compare the expected cost of operating and changing the software over its life, not only the initial development quote. NASA lists cost-estimate comparisons and total ownership and life-cycle costs among possible selection factors.
There is no defensible typical custom-software budget or average price established here. A precise-looking market figure would not help you compare proposals unless it matched your scope, delivery model, and operating needs.
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6. Make the contract match the decision
Before signing, make sure the statement of work is specific enough for both sides to determine what will be delivered and how completion will be accepted. Resolve the commercial and operational points that would be costly to leave ambiguous:
- Deliverables, milestones, dates, and the evidence required for acceptance.
- Payment triggers, scope-change approval, and how revised estimates are handled.
- Security and privacy duties, including data handling and relevant documentation.
- Documentation, intellectual-property rights, and access to source materials needed to continue the work.
- Warranty, maintenance, support, and the process for termination and handover.
NASA includes intellectual-property rights, maintenance, warranty, and contracts among supplier-selection considerations; CISA’s guide can also inform procurement and contract language. For a high-value engagement, involve appropriate legal and procurement reviewers. These resources do not substitute for jurisdiction-specific legal advice.
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Record the requirements and their priorities, the evidence requested, the score definitions, each candidate’s scores and supporting notes, material risks, the rationale for the selected fit, and any contract points still to resolve. This gives decision-makers a traceable basis for the choice and helps ensure unresolved issues are addressed before work begins. NASA advises documenting selection results, including advantages, disadvantages, and scores.
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Public procurement procedures depend on the applicable jurisdiction and rules. For example, UK Cabinet Office guidance for covered procurements says selection criteria and scoring systems must be relevant and proportionate and included in procurement documents. That is not a universal rule for private buyers or every public authority.
What to compare across candidates
Use the same evidence requests for every company, then weight the criteria according to project risk, business importance, and applicable obligations. This is a comparison framework, not a universal scoring formula.
Quick Recap
| Criterion | Evidence to request |
|---|---|
| Requirements fit | A proposed approach mapped to the required capabilities, constraints, and integrations |
| Team and relevant experience | Proposed roles, relevant completed work, references, and staff availability |
| Delivery capability | How planning, testing, review, releases, changes, documentation, and handover are handled |
| Security and privacy | Development practices, access and data handling, vulnerability management, and incident commitments |
| Accessibility | Applicable requirements, conformance evidence, exceptions, and acceptance method |
| Cost and continuity | Estimate assumptions, change pricing, support and maintenance expectations, and life-cycle cost |
| Ownership and contract | Intellectual-property rights, deliverables, acceptance terms, dates, warranty and support, and handover provisions |
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