Max Professional Android App Developer | Kotlin & Jetpack Compose Expert

Hire an experienced Android developer who builds real apps that solve real problems. Specializing in Kotlin, Jetpack Compose & Material Design 3. From security camera systems to productivity tools - I turn ideas into polished, professional Android applications.

View My Android Apps
1
Published Apps
2
In Development
Maximilian Cornett - Professional Android App Developer and software engineer focusing on Kotlin and Jetpack Compose

Try My Apps Now

EasyCCTV

EasyCCTV

Security Camera App
Remote File Explorer

Remote File Explorer

File Management App
Lists and Notes

Lists & Notes

Note-Taking App
Gnome Man Viewer

Gnome Man Viewer

Graphical man page viewer for easier access to commands and their documentation

PGP Suite

PGP Suite Firefox/Tor extension – Encrypt Messages & Files

Full information, screenshots, and download links available on each app page

About Me



Learn more about ListsAndNotes
Learn more about EasyCCTV
1 Published Apps
1 Apps open for beta testing
2 Apps in development phase

Tech Stack

The tools and technologies I use to build great apps

Frontend Development

HTML5
CSS3
JavaScript
React
Vue.js

My Frontend Philosophy

I believe in creating intuitive, accessible, and performant user interfaces that provide exceptional user experiences. My approach focuses on modern web standards, responsive design, and progressive enhancement.

Specialties:
  • Responsive Web Design & Mobile-First Development
  • Single Page Applications (SPAs) with React & Vue.js
  • Modern CSS (Grid, Flexbox, Custom Properties)
  • JavaScript ES6+ & TypeScript
  • Web Performance Optimization
  • Accessibility (WCAG 2.1 compliance)

Featured Projects

www.yourdev.net

This website.

Frontend Stack: • HTML5 • CSS3 • Vanilla JavaScript
Backend Stack: • PHP • MySQL •

Key Features

  • Bilingual Support: English/Swedish with persistent language switching using data-en and data-sv attributes
  • Theme System: Dark/light mode toggle with CSS custom properties and localStorage persistence
  • Responsive Design: Mobile-first approach with breakpoints for all device sizes
  • Progressive Web App: Service worker caching, web manifest, favicon suite
  • Interactive Components: Expandable skill cards, portfolio filtering, testimonial carousel
  • Performance Optimized: Lazy loading, minified assets, efficient caching strategies, WebP images
  • Analytics System: Comprehensive privacy-respecting analytics with detailed visitor tracking

Backend Development

Node.js
Python
MongoDB
PostgreSQL
AWS

Server-Side Excellence

I architect robust, scalable backend systems that handle complex business logic while maintaining high performance and security standards. My focus is on clean code, efficient databases, and reliable API design.

Specialties:
  • RESTful API Design & GraphQL Implementation
  • Microservices Architecture
  • Database Design & Optimization
  • Cloud Infrastructure (AWS, Docker)
  • Server Security & Authentication
  • Performance Monitoring & Scaling

Featured Projects

Payment Processing API

Secure payment gateway handling $1M+ transactions

Node.js • PostgreSQL • Stripe
Inventory Management

Real-time inventory system for e-commerce platform

Python • Redis • WebSockets
User Analytics Platform

High-performance data processing and analytics API

Node.js • MongoDB • AWS Lambda

Android & Mobile Development

Android (Kotlin)
Jetpack Compose
Material Design 3
Room & SQLite
Camera2 API

Building Real Android Apps

I'm not claiming to be a 10-year veteran. What I am: actively shipping Android apps using modern tools and best practices. Kotlin is my language of choice. Jetpack Compose handles my UI. MVVM architecture keeps things clean.

Tech Stack & Expertise:
  • Kotlin - Primary development language
  • Jetpack Compose - Modern declarative UI framework
  • Material Design 3 - Following latest design guidelines
  • MVVM Architecture - Clean, testable code structure
  • Camera2 API - Advanced camera control (EasyCCTV)
  • Room Database - Local data persistence
  • Coroutines & Flow - Async operations done right
  • Networking - HTTP servers, REST APIs, MJPEG streaming

Real Apps I've Built

EasyCCTV

Security camera app with real-time MJPEG streaming

Kotlin • Compose • Camera2 • HTTP Server
Lists & Notes

Note-taking app with rich formatting and categories

Kotlin • Compose • Room • Material 3
Next Project

Currently exploring desktop apps with Compose Multiplatform
Do you have an amazing idea for an app? Please, send me an email!

Kotlin • Compose Desktop • JVM

Cybersecurity

Web Security
Penetration Testing
Vulnerability Assessment
Security Auditing

Security-First Mindset

In today's digital landscape, security isn't optional—it's fundamental. I implement comprehensive security measures from the ground up, ensuring applications are protected against evolving threats while maintaining usability and performance.

Specialties:
  • OWASP Top 10 Vulnerability Assessment & Mitigation
  • Penetration Testing & Ethical Hacking
  • Security Code Review & Static Analysis
  • Authentication & Authorization Systems
  • Encryption Implementation & Key Management
  • Security Compliance (GDPR, HIPAA, PCI DSS)

Featured Projects

Banking Security Audit

Complete security assessment for fintech startup

Burp Suite • OWASP ZAP • Custom Scripts
Vulnerability Scanner

Automated web application security testing tool

Python • Selenium • Docker
Secure Chat Platform

End-to-end encrypted messaging application

Node.js • WebRTC • AES Encryption

Programming Languages

Languages I use for different types of development

Systems Programming

C/C++ Advanced
High-performance applications, System programming
Java Intermediate
High-performance applications, System programming
Rust Intermediate
Memory-safe systems, Web backends

Web & Application Development

Python Expert
Web development, AI/ML, Automation
JavaScript Expert
Frontend, Backend (Node.js), Full-stack
PHP Expert
Server-side development, CMS

Scripting & Automation

Bash/Shell Advanced
System administration, CI/CD, DevOps
PowerShell Intermediate
Windows automation, Azure management
Hobby Projects

Embedded & Hardware

Arduino C++ Intermediate
IoT projects, Sensor automation
Assembly Beginner
Low-level programming, Learning
VHDL Beginner
FPGA programming, Digital design

Why Kotlin? Why Now?

Strategic thinking about the future of app development

The Question Every Developer Asks

"What will be the big thing in the next 10 years? What's the next big step into the future?"

My Answer: Kotlin

Right now, I really believe in Kotlin. I had the opportunity to try it some time back, and the coding syntax is fairly unusual - it takes time getting used to. But it's so much neater once you do.

I decided to focus on Kotlin for a strategic reason: I have many years under my belt with C/C++ and similar syntax languages. So it made sense to take the time to learn Kotlin and see what it offers.

The Strategic Play

Sure, I could have just learned Java like everyone else. Here's the problem with that:

  • Java is easy for me - I can learn it very quickly since I know that kind of syntax in my sleep
  • Kotlin is unique - Its syntax is so very special that it really takes time to get into it
  • Better job prospects - I have a better chance of landing a job, even if I might be a bit slow at Java the first few weeks. I could spend those weeks on the job adjusting.
  • Can't do it in reverse - I couldn't have done the opposite. Starting with Java and learning Kotlin on the job would be much harder.

The Market Bet

It's a pretty niche market, sure. But I believe Kotlin will grow heavily with the incoming younger generations.

Google made Kotlin the preferred language for Android development. Companies are modernizing their codebases. The trajectory is clear - and I'm positioning myself ahead of the curve.

That's the kind of strategic thinking I bring to projects.

My Apps

Real applications solving real problems - built, shipped, and actively maintained

Live on Play Store
Remote File Explorer

EasyCCTV

Turn Android into a Security Camera

Transform any Android device into a powerful network security camera with real-time MJPEG streaming, web interface, and multi-client support. Perfect for home security, pet monitoring, or keeping an eye on your space.

Kotlin Jetpack Compose Camera2 API MVVM Material Design 3

Key Features:

  • Real-time MJPEG streaming over local network
  • Full-featured web dashboard accessible from any browser
  • Optional HTTP Basic Authentication
  • Multiple quality presets (LOW to SUPERHIGH)
  • Multi-client support for simultaneous viewers
Active Users
Open Source
v0.9
Coming to Play Store GitHub Visit Site

Latest Development Update:

November 2025: This is a work in progress. Not even up for internal testing yet, but will be soon! Working on v1.0 release with new features including motion detection, recording capabilities, and cloud sync option. Beta testing phase starting soon. The architecture is solid, using MVVM pattern for maintainability and Camera2 API for maximum hardware control.

Availible for download
Remote File Explorer

Remote File Explorer

Access Your Files Anywhere

Explore and manage your files remotely with ease. Secure, fast, and user-friendly file explorer accessible from any device.

Kotlin Jetpack Compose Firebase MVVM

Key Features:

  • Secure remote file access
  • Real-time file synchronization
  • Intuitive user interface
  • Offline access support
Secure
Real-Time Sync
Coming to Play Store Visit Site
Available for download
Lists & Notes

Lists & Notes

Note-Taking Without the BS

A no-nonsense note-taking and list management app for Android. No trials, no ads, no hidden costs, no upsells. Just notes and lists that actually work. Free forever because that's what it should be.

Kotlin Jetpack Compose Room Database Material Design 3 MVVM

Key Features:

  • Quick note creation with auto-save
  • Smart lists with checkable items
  • Rich text formatting (bold, italic, bullets)
  • Organize with folders and categories
  • Fast search across all notes
  • 100% offline - all data stays on your device
Always Free
Zero Ads
Private
Coming to Play Store Visit Site

Development Progress:

November 2025: Core functionality complete! Currently in closed testing phase of development. Please contact me to be a beta-tester! Working on polish and testing before release. The Room database integration is smooth, and Jetpack Compose makes the UI incredibly responsive. Planning to add themes, export functionality, and maybe voice notes in future updates. Current focus: making sure the free promise is sustainable forever.

Available for download

OpenPGP

PGP encryption extension for Firefox & Tor Browser

A transparent, minimal OpenPGP browser extension for Firefox and Tor Browser. Generate RSA key pairs, encrypt, decrypt, sign and verify PGP messages entirely within your browser — no data ever leaves your device.

JavaScript WebExtension API OpenPGP.js Firefox Tor Browser

Key Features:

  • Generate RSA key pairs inside your browser
  • Encrypt and decrypt PGP messages
  • Sign and verify messages
  • Master password protection for key storage
  • Zero data leaves your device — fully client-side
Always Free
Open Source
Visit Official Site
Available for download
Gnome Man Viewer

Gnome Man Viewer

Graphical Man document viewer built in C# and Gtk3

A graphical Man document viewer built in C# and Gtk3. Designed for simplicity and efficiency, it provides an intuitive interface for browsing and reading Man pages. Free and open source, ensuring privacy and no ads.

C# Gtk3

Key Features:

  • Intuitive graphical interface for browsing Man pages
  • Search functionality for quick access to Man pages
  • Search functionality within man pages for specific terms and highlighting
  • Accepts command line arguments for opening a specific man page
  • Search command line argument for quick access to relevant part of documentation with highlighting
Always Free
Open Source
Available on GitHub Visit Official Site Download Source Code

Development Blog

Thoughts, updates, and lessons learned while building apps

How I Built a Firefox Extension Malware Scanner — And Used It to Expose a Malicious "YouTube Downloader" Browser Malware
Apr 10, 2026 30 min read Security

How I Built a Firefox Extension Malware Scanner — And Used It to Expose a Malicious "YouTube Downloader"

Browser extensions sit at the most privileged layer of your web experience — they can read every page you visit, capture every keystroke, and silently exfiltrate your data. In this post, I walk through `extension-scanner.py`, an open-source static analysis tool I built to automatically detect malicious Firefox extensions. Then I put it to the test against a real-world extension that appeared in the wild masquerading as a harmless YouTube downloader — and the results are alarming.

browser-extension-security malware-analysis firefox-extension python cybersecurity reverse-engineering
The Ad-Blocker That Steals Your Clicks: Inside "Supreme Adblocker for Youtube" Malware Analysis
Apr 9, 2026 45 min read Security

The Ad-Blocker That Steals Your Clicks: Inside "Supreme Adblocker for Youtube"

This extension genuinely blocks YouTube ads. It also hides a 25 KB JavaScript payload in a PNG image, connects to a command-and-control server in China, waits 72 hours before activating, and then silently fires fake affiliate clicks every time you visit Taobao or JD.com. This complete analysis walks through every encoding step, the full webpack module map, static detection signatures, and a YARA rule — so you can reproduce every finding yourself.

Browser extension malware click fraud affiliate fraud Steganography Firefox Extension Firefox Extension Malware

Why Work With Me

Straight talk about what you're actually getting

I Ship Real Products

Not concept art. Not prototypes that "almost work." Real apps that you can download right now and that actual people use. EasyCCTV is live. Lists & Notes is nearly there. Your project will get the same treatment.

Modern Tech, No BS

Kotlin, Jetpack Compose, Material Design 3, MVVM architecture. I use tools that make apps better, not buzzwords that make presentations prettier. Clean code matters. User experience matters more.

Clear Communication

You'll know where your project stands. No jargon unless you ask for it. Regular updates. Honest timelines. If something's harder than expected, you'll hear about it before it's a problem.

I Actually Care

These aren't just gigs. I'm building a portfolio, a reputation, and honestly? I love this stuff. Your app success is my app success. When users love what we build together, that's the whole point.

Reliable & Committed

I finish what I start. Deadlines matter. Quality matters. If I take your project, I'm seeing it through. No disappearing acts, no excuses. Just solid work until we hit "publish."

Growing, Not "Expert"

I'm not selling 20 years of experience I don't have. What I am: motivated, capable, and learning fast. Two apps shipped. More coming. That energy and hunger? It's worth something.

Ready to Build Something Great?

Whether you need an Android app, desktop application, or want to discuss a crazy idea - let's talk.

Start a Project

What Clients Say

Don't just take my word for it

"Exceptional work! The website exceeded our expectations and the security audit helped us identify critical vulnerabilities."

Client 1

Sarah Johnson

CEO, TechStartup Inc.

"Professional, reliable, and delivered exactly what we needed. The mobile app has been a game-changer for our business."

Client 2

Mike Chen

Founder, FitLife App

Let's Build Something

Got an app idea? Need a developer? Let's make it happen.