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Before signing with a mobile app development partner, verify that its team can deliver for your app’s platforms and constraints, explain how it protects data throughout the app’s life cycle, substantiate its security claims, and accept clear written responsibilities for delivery and ongoing support. Give each factor weight according to the app’s data sensitivity, operating model, and complexity; there is no universal vendor score 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: its iOS and Android requirements, integrations, user needs, data sensitivity, and operational constraints. Ask what the proposed team—not just the company—has delivered and who will make technical decisions.
Ask the partner to explain its delivery approach, including milestones, points for your review, and how it will determine whether work is accepted. Request examples that show how it handled comparable constraints, and ask who would perform the work on your project. The official guidance cited here does not establish a standard portfolio-scoring formula; assess relevance to your own requirements instead.
Ask how security and privacy work in practice
Security should be owned across design, development, launch, and maintenance, not treated as a final test or assumed to come from the mobile operating system. The Federal Trade Commission (FTC) says, “There’s no checklist for securing all apps,” in App Developers: Start with Security (May 2017). Its guidance emphasizes adapting protections to the app and platform. Because that guidance is dated, confirm that technical details reflect the platforms and threat conditions relevant to your project.
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Ask the partner to walk through the data your app will collect, transmit, and retain, and how it will minimize that data. Then ask how it protects information in transit and on devices; manages credentials and permissions; secures servers; and responds to vulnerabilities or incidents. Have the team explain how it accounts for differences between iOS and Android rather than treating the platforms as interchangeable.
If the app handles health, financial, children’s, or other sensitive data, determine which rules apply with qualified specialists before finalizing contract language. The FTC’s Mobile Health App Developers: FTC Best Practices is particularly relevant to health apps and third-party services. It warns: “If you use a software tool developed by another company, it’s still your responsibility to ensure it conforms to your privacy promises and consumer expectations.”
Probe third-party libraries, SDKs, and services
Mobile apps often rely on external code and providers. Ask how the team selects libraries and SDKs, checks their permissions and known vulnerabilities, tracks updates, and responds if a dependency becomes unsafe. Request a component inventory or other project-appropriate evidence, and clarify who monitors third-party providers and maintains cloud or server services.
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Ask for evidence, not just assurances
Request concrete examples of the practices the partner describes: review steps, test plans, release controls, vulnerability handling, and relevant artifacts. Ask who can substantiate each answer and whether there are exceptions. A certification or completed questionnaire can be useful evidence, but it does not by itself show that a team’s practices fit your app.
NIST recommends using Secure Software Development Framework (SSDF) terminology to structure secure-development communications and focusing attestations on practices carried out throughout the software life cycle. Its Guidelines on Minimum Standards for Developer Verification of Software also provides context for discussing verification. CISA’s Software Acquisition Guide describes a baseline supplier assessment and notes that follow-up questions and supporting documentation may be warranted. These sources can help organize diligence; they are not a substitute for checking the partner’s actual evidence against your requirements.
Put responsibilities and exit arrangements in writing
Turn important expectations into explicit responsibilities and deliverables. Discuss scope and exclusions, acceptance and change control, source-code and build/release access, ownership and licensing, data use and deletion, confidentiality, incident cooperation, third-party service responsibilities, maintenance, support windows, and transition or handover. Which terms are appropriate depends on jurisdiction, industry, and deal structure; have counsel review the agreement.
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Make handover concrete: identify which artifacts, accounts, source code, build instructions, and app-store materials you will receive, and who will provide them. Agree how the work will be verified and what cooperation is expected if you change providers.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Compare candidates on the same dimensions
If you are evaluating multiple partners, ask each the same core questions and compare the answers against your project’s risks. Give greater weight to issues where failure would have greater consequences for your app; do not treat a simple total score as a universal verdict.
Quick Recap
| Dimension | What to compare |
|---|---|
| Mobile delivery fit | Relevance of experience to your platforms, integrations, users, data sensitivity, and operating constraints; the proposed team and decision-makers. |
| Security ownership | Who owns decisions and how protections are considered from design through maintenance. |
| Third-party components | How libraries, SDKs, cloud services, and their vulnerabilities are assessed and managed. |
| Evidence | Whether the team can substantiate its practices with relevant processes, tests, and artifacts. |
| Contract commitments | Whether responsibilities, deliverables, verification, and data-protection expectations are explicit. |
| Post-launch support | How defects, updates, support, and handover will work after release. |
Questions to ask before signing
- Who on the team 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 for iOS and Android differences and permissions?
- How do you assess libraries, SDKs, and cloud providers, and track and respond to their vulnerabilities?
- What security tests are performed before release, and what evidence can you share?
- Who is responsible for server, cloud, and third-party service updates and incident response?
- What artifacts, accounts, source code, build instructions, 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 compliance with them be verified?
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