• Software development across various platforms.
• Detailed code reviews.
• Bug fixes and enhancements for existing projects.

• Java: Cross-platform server, desktop, mobile, and web development.
• C/C++: Native application development.
• SQL: Database design, development, and management.
• JavaScript, HTML, CSS: Static and dynamic website development.
• Python: AI and LLM-driven applications.
• Electron, TypeScript, Vue, React: Cross-platform desktop and web app development.

My name is A. Ruben Kandel. I began coding in 2019, which has given me six years of hands-on experience. Currently, I am pursuing a bachelor's degree in computer science. I am fluent in English, German, Portuguese, Turkish, and have basic proficiency in French.

Since early 2023, I have been working as a freelance software developer, serving clients globally. While my expertise covers a wide range of tasks, my primary focus lies in developing custom full-stack websites.

Please explore more about my skills and projects below. Don’t hesitate to reach out with any inquiries!

• IDEs: IntelliJ IDE, CLion, Eclipse, Visual Studio Code, Visual Studio, Android Studio, Unity, UnrealEngine.
• Software: Windows, Linux, Ubuntu, CentOS, Office (Word, Excel, PowerPoint etc.), git, GitHub, GitHub Workflow/Action, GitLab, Docker, JIRA, Slack, MySQL, MariaDB, PostgreSQL.
• Libraries & Frameworks: Vaadin, Hilla, Spring-Boot, Tomcat, React, Angular, Bootstrap, Vue.js, Node.js, Electron, Java AWT/Swing/FX, REST APIs, Swagger/OpenAPI, Webhooks, HTTP, Android API, LibGDX, Maven, Gradle.

• Basic rate: 15€ per hour
• Pro rate: 30€ per hour
• Expert rate: 60€ per hour

View the full contract for development on software projects here.

• E-Mail: [email protected]
• Live-Chat (Discord): ak_osiris
• Live-Chat (no login): https://autoplug.one/chat

You can view a list of my most successful Open-Source projects here, and below you can find some curated projects that give you a good overview of my strengths:

A fully custom ERP Web-Panel with individual features requested by the client like an integrated web-based pdf-editor with presets and automatic data filling, a products database and customer information data storage, as well as multi-user collaboration capabalities and integrated chat and google synchronized calendar.

Allows live video streaming of different airport cameras and controlling them, with an option to track incoming airplanes by using AI (object detection). This was fun and challenging since it required handling the individual images of the video stream myself and required several performance optimizations due to object detection causing spikes in processing.

AutoPlug is my largest personal and monetized project. Its goal is to simplify/automate maintenance tasks of server admins. Its made of 2 parts which optionally can communicate with each other.

AutoPlug-Web can be accessed at autoplug.one and is more of a centralized admin panel to manage servers and collaborate with server staff easily. It communicates with the AutoPlug-Client and is responsible for critical/sensitive operations like showing/adding/updating/removing files based on user permissions and providing access to terminals. This requires a high level of security and trust from its users, which is given by using a backend and security focused framework called Vaadin. Developing this part of the software taught me about handling the complexity of larger applications, webservers in general, SSL, HTML/CSS/JavaScript, payment systems like PayPal/Stripe integrated via my PayHook library, SQL databases and code generation with my jSQL-Gen tool. The File-Manager looks like this (outdated):

This is accompanied by the AutoPlug-Client, which contains most of the automation features. Developing it taught me a lot about Java in general, Server-Client communication, the TCP protocol, REST-APIs, web-scraping, JSON, and even made me consider very interesting alternatives like Netty, which finally was not implemented due to the release of Virtual-Threads and the comparatively simpler Java Sockets-API. This is what it looks like when running some tasks (outdated):

Desku is a low-code, developer-first Java framework with UI components, for developing cross-platform desktop, web, android/ios apps in one codebase. I like the Java language, however its GUI libraries feel outdated and something like this doesn't really exist, thus this project. Under the hood it's based on Webviews, meaning it uses HTML/CSS/JS to display the frontend, which theoretically makes it compatible with all frontend frameworks out there. The focus here is to provide a developer-friendly, simple API and handle the more complex things in Desku. This project expanded my knowledge of webserver internals and made me discover some annoyances of the Java language (which you can find over at my-jsrs).

I worked on multiple Open-Source Android apps like OpenLauncher, Simple-Calendar, Notally, VinylMusicPlayer, etc. where I fixed bugs and implemented new features for clients. This taught me how to interact with existing code, fight the need of changing everything and focus on adding the requested changes only. I also achieved a basic understanding of the Android API and the Kotlin language, plus these projects also made me better at debugging/navigating other developers code.

• Initial Consultation: Free. Please provide as much detail as possible. I offer one free 15-minute online meeting.
• Progress Updates: Provided every 8 hours of work.
• Code Access: Code will be uploaded to a private GitHub repository, accessible only to you and me for transparent version control.
• Budgeting: I work on tasks until completion or until the budget limit is reached. Please specify your preferred and maximum budgets.