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Software developer with a strong foundation in data structures and algorithms, specializing in high‐performance systems, optimization, and purpose‐built engineering solutions. Programming Languages • C, C++, Go • Python, Lua, Bash Libraries • Pandas, NumPy, ezdxf Client‐side • HTML, CSS, JS, TS • HTMX • React, Next.js • Hugo, Astro Server‐side • Node.js, Deno • Django, FastAPI Databases • PostgreSQL • MySQL, MariaDB • SQLite • MongoDB • Redis, DynamoDB Infrastructure • Linux • Docker, Podman • Cloudflare Tools • Git (GitHub, GitLab) • Neovim Documentation • Markdown • reStructuredText • LaTeX • Typst Productivity • Microsoft Office • Microsoft Power BI Computer‐Aided Design • AutoCAD • SOLIDWORKS • Siemens NX

TLDR: Check reviews ! :) portfolio: bilalbelli.eu 👈 Why hiring me ? because i provide a high quality job and get the job done real quick ! I’m an experienced Software Engineer (with diploma) and Developer (not a vibe coder ! i understand and i can do everything) specializing in Python, Java, Javascript, Typescript, and modern Web technologies (Angular, Spring Boot, Node.js, Flask, Wordpress, Bootstrap, Next.js, Nuxt.js, Electron.js), and I also provide tutoring and mentoring in programming and computer science topics. I hold a strong Computer Science and Systems Engineering background, with solid experience in software development, backend & frontend engineering, system design, machine learning (AI, ML, DL, Agents) and applied problem-solving. I enjoy tackling non-standard and real-world problems, covering application design, algorithmic thinking, system architecture, and production-ready implementations, from initial analysis to clean, documented, and maintainable code. I regularly work on full-stack engineering problems, including: - Coding, - Documentation, - Manual Creation, - Scientific & Technical Writing, - Tutoring, I have hands-on experience with a wide range of technologies and tools, including Python, Java, C, JavaScript, TypeScript, HTML, CSS, SQL, and frameworks such as Spring Boot, Node.js, Flask, Electron, and Angular. I also work with relational databases (PostgreSQL, MySQL, SQL Server), and modern DevOps & infrastructure tools like Git, Docker, Jenkins, Ansible, Jira, as well as Linux environments and networking solutions (Nginx, HAProxy, DNS, virtualization). I’m comfortable learning and adapting to new technologies quickly, and my broad technical foundation allows me to switch tools and frameworks efficiently to best fit project requirements.

I am an ACM-ICPC World Finalist and software engineer. I have been developing backend and DevOps solutions using C++, Java, and Python since 2016. I have experience in multiple domains that include fintech, agrotech, health tech, IoT, and Saas. I have been working as a remote developer with globally distributed teams since 2019. I am a quick learner, good with communication, proactive and punctual human being. Nothing excites more me than a challenge that is necessary but difficult to solve. I am also a competitive programmer and expert in data structures and algorithms. I have a decent understanding of UNIX systems especially how different types of data structures are blended to solve complex problems of operating systems. I am a team player and can work as solo as well. I never compromise the quality of my work doesn't matter how the pressure is. And, I believe in requirement analysis as the most crucial part of engagement.

I’m a dedicated Software Engineer with a strong focus on building robust, scalable, and maintainable solutions using modern technologies. With expertise spanning .NET Core, WPF, HTML/CSS, JavaScript, React.js, and SQL, I develop applications that are clean, efficient, and user-friendly — whether for the web, desktop, or API-driven backends. My experience covers the full development lifecycle: Designing and implementing secure, high-performance RESTful APIs Creating intuitive user interfaces with WPF and responsive front-end design using HTML/CSS Integrating modern practices like CI/CD pipelines, containerization with Docker, and clean architecture Optimizing database performance and ensuring long-term maintainability I approach every project with a sense of ownership, aiming to deliver solutions that not only meet immediate needs but can grow and adapt over time. I value clear communication, consistency, and aligning with your vision to build lasting results. If you’re looking for a developer who can become an integral part of your team, ensure smooth delivery, and support your product’s growth — let’s create something exceptional together.

I’m a backend-focused developer who builds and fixes web applications, APIs, and automation scripts. If your project is stuck, broken, or missing functionality, I can help you get it working quickly and reliably. What I can help you with: • Fixing bugs and debugging backend logic • Building and improving REST APIs (Node.js, Python) • Creating simple, clean web applications • Automating tasks and writing scripts • Integrating external services and APIs I have hands-on experience with systems programming (C/C++), backend development, and real-world projects including a microservices system, a Slack automation bot, and low-level applications like a Unix shell and a raycasting engine. I focus on clear communication, fast turnaround, and delivering working solutions — not just code. If you need someone who can understand your problem and solve it without wasting time, feel free to reach out.

I have more than 15 years of programming experience. As a freelancer, I have broad experience: I developed web (ASP.NET, Python, PHP), desktop (C++, C#, Python — Linux and Windows) and mobile (Android — Java, C++) applications. I list here some of my jobs. C#: * clubspeed.com — a large software suite for family entertainment clubs; included C# code (80%), including CoreApi and ASP.NET Razor, plus PHP (Laravel) and Node.js code (for low-level car racing control tasks). I developed it as a team member. * qadra.com — a financial company; C# code (80%), Python (some microservices are Python/Flask based, 20% of code), AWS-hosted with Docker containers and Lambdas. I developed it as a team member. * enven.nl — implemented from scratch their non-public partners portal: ASP.NET Razor and some CoreApi endpoints. * ASP.NET website for house rentals. * ASP.NET website for remote control of a robotic device via a WebSocket connection. * Vegetable-oil plant automation desktop program (C# + WinCC). Python: * Embeddable fact-checking chat that uses the LangGraph framework to implement a customizable LLM/AI backend (OpenAI, DeepSeek, Hugging Face, or Ollama). It allows administrators to embed the component in their websites so users can ask questions about facts described in articles and verify whether facts listed in an article are true. It included agentic code and many external APIs to check facts (not just asking an LLM), and even computer vision to inspect website photos (OpenCV). Backend is FastAPI. * AI/LLM-based ad selection for a website (FastAPI and LangGraph). It processes website text or chat messages and selects ads of different types related to the content. It contains SDKs for embedding ads on many platforms, including Go, React, and plain HTML. * Polish-language training software, based on Django and LangGraph. * Many small projects: desktop scripts, web scraping (Selenium and related tools), and simple AI agents. C++: * Factory equipment monitoring system (Ubuntu Linux, custom server over TCP/IP, web interface in PHP). * Many small projects, some of which are mentioned in reviews on this profile; many are non-public. * Powerful software for automated ad submission on social networks (massive bots that send millions of messages). PHP: * 20+ websites — without CMS, with my own CMS, and with open-source Drupal, WordPress and Joomla CMSs. * Backends for Android applications. Android: * SOCKS5 proxy application that allows sharing mobile VPN with non-mobile clients via the SOCKS protocol. * Many WebView-based "business card" applications. * Dating-related applications, including erotic puzzles. Human emulation: * Spam bots — I cannot provide a specific list of such software for legal reasons. * Automatic checkout on eBay and similar websites. * PayPal automatic payments. * Data scraping, including air tickets and goods in online stores. Reverse engineering — I cannot provide a specific list of reverse-engineered software for legal reasons. * Java bytecode reverse engineering, including Android. * .NET bytecode reverse engineering. * Machine code for 32-bit and 64-bit x86 and ARM CPUs. Assembler: * High-performance cryptographic library for x86\_64 CPUs.