What does the Dagfinn skill do?

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.

How do I install this skill file?

Download the .skill package (it contains SKILL.md), paste the contents into Claude Projects Instructions or your AI's system prompt, add your own context and start your first session. Works with Claude, ChatGPT, or any AI chat that accepts system prompts.

Which AI tools does this skill work with?

Works with Claude (recommended), ChatGPT, Gemini, Perplexity and Copilot, and any AI chat that accepts system prompts. Claude Projects gives the best results.

What is included in this download?

One .skill package delivered instantly after purchase: the full SKILL.md role configuration plus a worked-example file with a real scenario so you see the quality before you rely on it. No subscription, yours permanently.

How is this different from using Claude without the Dagfinn skill?

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.

Mobile Application Security Engineer AI Skill

Name: Dagfinn — Mobile Application Security Engineer AI Skill
Brand: KissMySkills
Price: 14.99 USD
Availability: InStock

Dagfinn — Mobile Application Security Engineer AI Skill

$14.99

Dagfinn — Mobile Application Security Engineer AI Skill

$14.99 this skill vs $145+/hr, hiring one

⚡ Instant download ◆ Claude & ChatGPT ∞ Keep forever

Instant download · 30-day money-back guarantee. Pay once, keep forever — no subscription. Refund policy

Harden your mobile app where it counts: storage, keys, biometrics, transport, components and the client-side secrets that should not be there.

MASVS and MASTG assessment of iOS and Android builds
Keychain, keystore and biometric binding done correctly
Deep links, exported components and WebView hardening
SDK supply chain, anti-tamper trade-offs and secure release

Mobile teams shipping a regulated or high-value app who need a real security assessment rather than a store checklist.A mobile application security engineer bills $145+/hr, this is one file, yours forever.

// what's inside

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

→MASVS and MASTG assessment of iOS and Android builds
→Keychain, keystore and biometric binding done correctly
→Deep links, exported components and WebView hardening
→SDK supply chain, anti-tamper trade-offs and secure release

📄 dagfinn-mobile-application-security-engineer.skill Under 2 min install Works with Claude, ChatGPT & any AI chat

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.

dagfinn-mobile-application-security-engineer.skill

# Dagfinn - Mobile Application Security Engineer

You are Dagfinn, a senior mobile application security engineer. You assess against MASVS and MASTG, and you are honest about what client-side hardening can and cannot achieve.

## How you work
1. Confirm authorization, then analyse the build the way an attacker would
2. Check storage, keystore and biometric binding before anything cosmetic
3. Test transport, pinning, deep links, exported components and WebViews
4. Find client-side secrets and SDK risk; treat the client as untrusted
5. Rank findings by real exploitability and sequence them per release

Authorized assessment only, on builds you own or are contracted to test. Confirm current platform behaviour before relying on it.

Excerpt from the actual file you'll download.

// try it

prompt

$Our banking app failed a client security review. Assess it and tell me what to fix first.

Dagfinn returns a MASVS-mapped assessment with findings ranked by real exploitability, the storage, keystore and biometric corrections with code-level direction, transport and pinning decisions with bypass expectations set honestly, component and WebView hardening, the SDK and secret findings, and a release-by-release remediation sequence.

// how to install Under 2 minutes

Four steps. Any AI chat.

01
Download the file
After checkout, the download link lands in your inbox. Save the file anywhere on your device.
02
Open your AI chat
Claude, ChatGPT, Gemini, Grok, or Copilot — whichever one you already use.
03
Paste the file contents
Drop it into the system prompt, Project instructions, or custom instructions field.
04
Start working
Your AI is now configured as a specialist. Ask it anything inside its domain.