Hire an AI mobile app builder

Everything it can hand back

Your task sets the actual outputs. The specialist picks the methods that cover them.

• A native or cross-platform decision, with the reasons
• A plan for the iPhone side and the Android side
• Speed, memory and battery targets, and how to measure them
• A plan for offline use, saved data and sync
• A test list of devices and OS versions
• A list of open risks and missing facts

How it does the job well

• You cannot build, run or test the app unless the host gives you tools. Say which checks you did not run.
• Targets and sample figures are labelled as targets or examples. Do not report them as measured.
• Treat store rules and OS limits as things to check against Apple's and Google's current documents when the plan depends on them.
• Ask before anything that spends money, publishes an app or changes a live account.
• Read the existing code, its conventions and its tests before changing anything. Match the project's patterns.
• Make the smallest change that fully solves the request. Keep unrelated refactors out.
• Reproduce a bug before fixing it, and add a test that fails without the fix.

Mistakes it avoids

• Claiming code works without running it or its tests.
• Inventing APIs, package versions or settings instead of checking the installed ones.
• Changing behaviour outside the request, such as reformatting whole files or renaming public interfaces.

What a good result looks like

An example, not your task: You have an app idea and don't know whether to build native or cross-platform.

• Platform strategy. Platforms, oldest supported versions, and a native or cross-platform choice with reasons.
• Development approach. The framework, navigation, state handling, and the plan for saved data and sync.
• iOS features and Android features. Each feature that needs platform code, and the tool or service to use for it.
• Performance targets. Start time, memory and battery targets to verify, and the tools that measure them.
• Platform integrations. Login, camera, location, push alerts, analytics and crash reporting choices.
• Device test plan. Which phones and OS versions to test, and what to check on each.

How the work is checked

• The changed files build, and the relevant tests and linters pass. The commands and results are shown.
• Each change is explained in one line with its reason, and risky areas are named.
• Any check that could not run is reported as NOT_RUN with what it needs.
• States which checks passed, failed or could not run, and names missing inputs.

These checks have not been run against a model yet. Your AI uses them to check its own work.

A second opinion

Before it hands back, your AI reviews the draft the way Tim Berners-Lee would. This is a way of reviewing the work. It does not mean they wrote or endorse it.

Capabilities

• Set platforms and limits. It confirms the platforms, the oldest phones to support, your team's skills and the features you need. Missing items are asked once, then marked MISSING.
• Choose how to build. It weighs native Swift and Kotlin against React Native or Flutter, and writes the reasons for the pick.
• Plan the data. It plans saved data, sync and navigation so the app still works on a poor connection.
• Plan each platform. It lists the iPhone and Android features that need platform code, such as biometric login, camera, location and push alerts.
• Set speed and battery targets. It sets targets for start time, memory and battery use, and names the tools that measure them.
• Plan tests and launch. It lists devices and OS versions to test, the monitoring to add, and a staged rollout.

How the role works

1. Checks your task, context and available tools.
2. Picks the methods needed and prepares a work plan.
3. Carries out supported tasks, with each method's limits and review gates.
4. Checks the real deliverables and corrects supported faults.
5. Hands back files, evidence and unresolved gaps.

Your specialist's working setup

Download the base specialist without a task form or account. README.md and SETUP.md explain how to use the folder. SOUL.md defines its scope. INTAKE.md asks missing questions inside your AI. PLAYBOOK.md, SKILLS.md, BEST_PRACTICES.md, CHECKS.md and HANDOFF.md guide the work and its checked deliverables.

Complete associated skills, supporting files and licences are included. Choose only the methods needed for the actual task. Keep context, working files and accepted feedback in your AI project.

Use this specialist through MCP or the API

Call prepare_specialist with role_id engineering-mobile-app-builder only. No task is required to load it. Your AI asks what job you need done, what you want back and which relevant context it can use.

For task-led hiring, call find_specialist, explain the suggested specialists and let the user accept or change the team.

Complete ZIP: Download base specialist. API: GET /api/v1/specialists/engineering-mobile-app-builder/pack. The host AI supplies its own model, tools and execution; a pack does not connect accounts or run a task.

Inputs and helpful context

The specialist starts from the task brief. Only active methods require their inputs.

For the primary method, when used

• What the app does and who uses it, in a few sentences
• The features you need, such as login, camera, location, payments, push alerts or offline use
• Your team's skills and budget, such as "one developer who knows React"
• The phones and OS versions you must support (optional)
• Your backend or API, and any design files (optional)

Helpful context (optional)

• Screens or a rough sketch of the main flows.
• Your API notes or a sample response.
• The phones your users actually have, from your site or app analytics.

Tools and access

• Claude, ChatGPT or Gemini with file upload: They can read your design files and API notes alongside your brief.

Functions and deliverables

• Mobile app builder: Plan your iPhone and Android app: native or cross-platform, features to build, phone tests and store launch checks. Bring your app idea.
  • A native or cross-platform decision, with the reasons
  • A plan for the iPhone side and the Android side
  • Speed, memory and battery targets, and how to measure them
  • A plan for offline use, saved data and sync
  • A test list of devices and OS versions
  • A list of open risks and missing facts
  Source: Michael Sitarzewski and Agency Agents contributors.
• Expo React Native data fetching coder: Describe the data your app needs. Get mobile data fetching code for React Native with Expo: caching, retry, offline support and safe token storage.
  • Fetch code with error handling
  • Caching and retry settings
  • An offline plan
  • Safe token storage code
  • Environment files for each stage
  Source: sickn33.
• Android phone heat and battery checker: Share when your Android phone gets hot or drains fast. Get evidence checks, possible causes and proposed next tests.
  • Read-only check results
  • A named likely cause
  • Evidence kept apart from inference
  • One small reversible fix to approve
  Source: sickn33.
• iPhone screen designer: Design iPhone app screens that feel native, from onboarding to paywalls, checked for screen sizes and dark mode. Test on a simulator or a real device.
  • Native-feeling screen designs or code
  • Correct navigation, lists, forms and sheets
  • A size check on small and large phones
  • A list of places that break Apple conventions
  Source: sickn33.
• AI project context organiser: Share your project and next task. Get a short rules file, a focused file list and a clear handoff for later sessions.
  • A ready rules file for your project
  • A list of which files to load for each task
  • Rules for when to reset or trim the session
  • A checklist for spotting drifting answers
  Source: Addy Osmani.
• Tim Berners-Lee: Review a system or shared knowledge plan using Tim Berners-Lee’s recorded approach. Link existing information, choose simple formats and check control points.
  • Your problem worked on the way Tim Berners-Lee would: their questions, their method, their push-back
  • The answer or the work, in Tim Berners-Lee's voice, using their ideas by name
  • Anything that goes beyond their public record, marked
  • One suggested next step

Tasks you can use it for

• You have an app idea and don't know whether to build native or cross-platform.
• Your small business needs an app with login, push alerts, camera or offline use.
• You are one developer and want a build order and a test plan.
• Your app is slow, drains battery or crashes on older phones.

Limits to check before starting

• You have a finished app and need to get it into the App Store or Google Play. Use the Mobile app release planner.
• You want listing text and keywords for the store page. Use the App store optimizer agent.
• You need a website that works well on phones, not an app. Use the Frontend developer.

Best way to use this role

Give it one clear outcome, the actual files and a definition of done. Keep the work in one AI project so it can reuse checked context and earlier files.

• Download the pack and add it to your AI as a skill. Or open a new chat and paste SKILL.md, then references/source-agent.md.
• Describe the app, the features and your team in a few lines. Attach any designs or API notes.
• Read the first section, "Platform strategy", and check that the choice fits your team and budget.
• Change any limit that is wrong, such as the oldest phone you will support, and ask for a new plan.
• Treat every number as a target to test, not a promise. Test on real phones before you rely on it.
• When the plan is ready, use the Mobile Release Engineer agent to plan signing and the store launch.

Read it as data

Read the complete role setup as JSON. Connect your AI to the AI Blocks MCP library and read aiblocks://roles/engineering-mobile-app-builder for its role instructions and pinned sources.

This is a prepared AI role. No task has run. Your AI carries out authorized work using its available tools and reports the actual deliverables and checks.