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Before signing with a mobile app development partner, verify that the team can deliver for your app’s platforms and constraints, explain how it protects data and manages third-party code, and show evidence for its claims. Then put responsibilities for security, delivery, support, and handover into the contract. Give the most scrutiny to the risks that matter most for your app; there is no universal vendor score or checklist that fits every project.
Start with fit for your app
A polished portfolio is not enough. Look for work that resembles your app in the ways that affect delivery: iOS and Android coverage, integrations, user needs, data sensitivity, and operational constraints. Ask the partner to explain what is comparable and what is not.
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- Identify the actual team. Ask who will do the work, who makes technical decisions, and who owns security decisions. Confirm whether the people answering your questions will remain involved after kickoff.
- Test the proposed delivery approach. Request milestones, review points, and acceptance criteria. Ask how the team will handle changes in scope and dependencies on your staff or other suppliers.
- Probe platform differences. Ask how the plan accounts for iOS and Android permissions, device storage, and release processes rather than assuming one implementation fits both.
Judge fit against your project’s needs, not a generic portfolio score. The official guidance cited below does not prescribe a universal formula for rating development partners.
How should you check security and privacy practices?
Ask who is accountable for security from design through development, release, and maintenance. Platform protections do not remove the developer’s responsibility to understand and implement protections appropriate to the app. The FTC’s App Developers: Start with Security (May 2017) emphasizes adapting security to the app rather than relying on a one-size-fits-all checklist.
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- Data: What personal or sensitive information will the app collect, transmit, and retain? Why is each item needed, and when is it deleted?
- Protection: How is data protected in transit, on devices, and on servers? How are credentials, permissions, and access handled?
- Lifecycle: What security reviews and tests happen before release? How are vulnerabilities reported, prioritized, fixed, and communicated?
- Responsibility: Who secures and updates servers, cloud services, and other infrastructure, and who coordinates response to an incident?
For health, financial, children’s, or other sensitive information, determine which laws and regulatory requirements apply with qualified specialists before finalizing contract language. Applicability depends on the app and how it operates.
How does the partner manage third-party code and services?
Libraries, software development kits, cloud services, and other suppliers can affect both security and privacy. Ask how the partner selects components, checks permissions and known vulnerabilities, tracks updates, and responds when a dependency becomes unsafe. Request a component inventory or other project-appropriate evidence.
Clarify who monitors and updates each third-party service, including cloud and server components, and who acts if a provider has an incident or stops supporting a component. NIST’s Cybersecurity Supply Chain Risk Management Practices for Systems and Organizations covers supplier risk assessment, software verification, software bills of materials (SBOMs), open-source controls, and vulnerability management. It is federal acquisition guidance; its questions can inform private-sector diligence, but it does not make every practice a universal legal requirement.
Ask for evidence, not assurances
For each important claim, ask what the team actually does, who can substantiate it, and what exceptions apply. Useful evidence can include documented review steps, test plans, release controls, vulnerability-handling procedures, or relevant project artifacts. The form of evidence should fit the work and any confidentiality limits.
NIST recommends using its Secure Software Development Framework (SSDF) terminology to organize secure-development communications and having attestations cover practices throughout the software life cycle. See Attesting to Conformity with Secure Software Development Practices (February 4, 2022). CISA’s Software Acquisition Guide describes a baseline supplier assessment and notes that follow-up questions or documentation may be warranted. A certification or completed questionnaire can support an assessment, but neither proves by itself that the team’s practices suit your app.
What should you ask before signing?
Use the same core questions with every candidate so you can compare concrete answers rather than presentation styles:
- Who owns security decisions from design through post-release maintenance?
- What personal or sensitive data will the app collect, transmit, or retain, and how will you minimize it?
- How do you adapt security controls to iOS and Android differences, including permissions and device storage?
- How do you assess libraries, SDKs, and cloud providers, track their vulnerabilities, and respond to new issues?
- What security tests happen before release, and what evidence can you share?
- Who is responsible for server, cloud, and third-party service updates and incident response?
- What source code, accounts, build instructions, release assets, and app-store materials will be handed over?
- How are defects, security updates, and support handled after launch?
- Which commitments will appear in the contract, and how will we verify they are being met?
Put responsibilities and exit readiness in the contract
Translate important expectations into specific responsibilities and deliverables. FTC guidance for mobile-health app developers recommends spelling out data-protection expectations for service providers. Its Mobile Health App Developers: FTC Best Practices also warns that using another company’s software does not transfer responsibility for meeting privacy promises and consumer expectations.
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Discuss these practical negotiation topics with the partner and have counsel review the agreement for your jurisdiction, industry, and deal structure:
- Scope, exclusions, milestones, acceptance criteria, and change control.
- Access to source code, development accounts, build and release assets, and documentation; ownership and licensing of deliverables and components.
- Permitted data use, retention and deletion, confidentiality, and cooperation on security incidents.
- Responsibilities for third-party services, infrastructure, security updates, and maintenance.
- Defect handling, support windows, post-launch updates, and transition or handover requirements.
Make the obligations verifiable: specify what will be delivered, who is responsible, and how acceptance or completion will be confirmed. The exact clauses needed depend on the project and agreement.
Compare candidates on the same criteria
If you have more than one viable partner, compare them using the same evidence and weight each area according to the consequences of failure for your app. A sensitive-data product may need more scrutiny of privacy, incident response, and supplier controls; a project with complex integrations may need more attention to platform experience and dependency ownership.
| Criterion | What to compare |
|---|---|
| Relevant delivery fit | Similarity of platforms, integrations, users, data sensitivity, and operating constraints; identify the people assigned to the work. |
| Security ownership | Named responsibilities and practices across design, development, release, and maintenance. |
| Third-party components | Selection and vulnerability processes, component evidence, and responsibility for updates and incidents. |
| Evidence quality | Specific, relevant artifacts and accountable explanations, including stated exceptions. |
| Contract commitments | Clarity and verifiability of obligations, deliverables, and responsibility divisions. |
| Post-launch support | Plans for defects, security updates, support, and handover of code and release assets. |
Do not treat a numerical score as objective unless you define how it is calculated and what evidence supports each rating. The strongest choice is the partner whose demonstrated practices and written commitments fit the risks and operating needs of your particular app.
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