Mobile Application Security Engineer AI Skill - Dagfinn
Harden your mobile app where it counts: storage, keys, biometrics, transport, components and the client-side secrets that should not be there.
Claude skill package instant downloaddagfinn-mobile-application-security-engineer.skill
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Example
You: Our banking app failed a client security review. Assess it and tell me what to fix first.
AI: Dagfinn returns a MASVS-mapped assessment with findings ranked by real exploitability, the storage, keystore and biometric corrections with code-level direction, trans...
This is not an app. It's an expert you add to your own AI.
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Ask your AI for it by name, or pick it in your dashboard. No need to buy the file.
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// the file itself
The first lines of the file your AI will read, exactly as delivered. Nothing rewritten for the page.
You are Dagfinn, a Mobile Application Security Engineer who assesses iOS and Android apps against MASVS using MASTG procedures, with Frida, objection and jadx. You have been activated to find what your binary and storage reveal.
// what's inside
Mobile teams shipping a regulated or high-value app who need a real security assessment rather than a store checklist.
// two ways to get it
$12/mo cancel anytime, or $99 a year
$19 one payment
Already on Library or Both? This one is included, no need to buy the file.
// ask your assistant
Go to kissmyskills.com/pages/connector and set up the "Mobile Application Security Engineer AI Skill - Dagfinn" skill (handle: dagfinn-mobile-application-security-engineer) for me
Paste it into Claude, ChatGPT, Claude Code, Cursor or Codex. Your AI walks you through connecting KissMySkills (about 3 minutes, 7-day free trial) and loads the skill. What your AI will read →
Drop Dagfinn into Claude and get a mobile security engineer who will tell you plainly that your app can be decompiled, then harden what actually matters.
Dagfinn secures iOS and Android applications end to end against MASVS and MASTG: static and dynamic analysis of mobile binaries, authorized reverse engineering of an APK or IPA with jadx, Frida, objection and Hopper and hardening against exactly those techniques, insecure local storage, keychain and keystore usage, biometric authentication bound to a cryptographic operation rather than a UI gate, certificate pinning and transport security with realistic bypass expectations, deep link and intent handling, exported components, WebView hardening and JavaScript bridges, third-party SDK and mobile supply chain risk, runtime protection, root and jailbreak detection and its genuinely limited value, obfuscation and anti-tamper trade-offs, mobile API abuse and client-side secrets that must not exist, permission hygiene and store privacy requirements, and secure release and code signing.
What you get
How to install
Download the .skill package, open Claude, paste SKILL.md into your Project Instructions or system prompt, describe your requirement, and Dagfinn builds the answer. Includes a full worked example so you see exactly what you get.
After checkout, the download link lands in your inbox. Save the .skill file: Claude takes it as it is.
Any AI chat you already use: Claude, ChatGPT, Gemini, Grok, Copilot or another.
Claude: turn on code execution in Settings → Capabilities, then Customize → Skills → + → Create skill → Upload a skill and pick the .skill file. ChatGPT, Gemini and others: open the .skill file like a .zip archive and paste SKILL.md into custom instructions or Project instructions.
Your AI is now configured as a specialist. Ask it anything inside its domain.
No technical knowledge required.
Harden your mobile app where it counts: storage, keys, biometrics, transport, components and the client-side secrets that should not be there. Load it once into Claude Projects and you get a configured Mobile Application Security Engineer without re-explaining context at the start of every session. This skill is for authorized, defensive security work only. Validate findings in your own environment, follow your rules of engagement and written authorization, and confirm current framework, vendor, and regulatory specifics before you act on them.
Download the .skill package (it contains SKILL.md), then, in Claude, turn on code execution in Settings → Capabilities and add it under Customize → Skills → + → Create skill → Upload a skill (in ChatGPT, Gemini or another AI, open it as a .zip and paste SKILL.md into Project instructions or custom instructions), add your own context and start your first session. Works with Claude, ChatGPT, or any AI chat that accepts system prompts.
Works with Claude (recommended), ChatGPT, Gemini, Perplexity and Copilot, and any AI chat that accepts system prompts. Claude Projects gives the best results.
Without a skill file your AI starts every session as a general assistant. With Dagfinn loaded it applies Mobile Application Security Engineer methodology from the first message, with consistent quality every time. This skill is for authorized, defensive security work only. Validate findings in your own environment, follow your rules of engagement and written authorization, and confirm current framework, vendor, and regulatory specifics before you act on them.
This one and 2,500+ others, inside Claude, ChatGPT, Claude Code, Codex or Cursor. Cancel anytime.
7 days free, every skill