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I help companies build latency-sensitive audio systems and performance-critical native applications for embedded, desktop, and mobile platforms. My core expertise is turning complex low-level requirements into reliable and scalable architectures and implementations. Project Highlights: 1. Roc Streaming — co-founded and maintain an open-source real-time audio streaming ecosystem. 2. ViveSound audio engine — co-founded ViveSound and implemented commercial engine for OS-level audio processing injection. 3. Internet audio streaming — built a streaming daemon for embedded Linux with guaranteed 40 ms Internet latency, forward error correction and packet loss concealment. 4. Airborne audio synchronization — built acoustic-signature-based synchronization, aligning network playback to over-the-air audio within 1-2 ms. 5. Distributed playback sync — built multi-receiver network playback synchronization with sub-millisecond precision over high-jitter Internet connection.

I'm an open-source programmer looking to capitalize on his skill set. I specialize in Rust and I'm a regular contributor of bugfixes and features to various open-source projects involving the language. My expertise lies in low-level optimizations, the notable ones I did for the main rust-lang umbrella being: * Polly optimizer to rustc * Alternative aliasing rule (`#repr(transparent)`) to rust-bindgen * Well-received prototypes for fast-math floating-point optimizations I'm comfortable with `unsafe` Rust code and interop with C or C++. I've been coding since 2009 and have used various programming languages besides those two. Can probably pick up C#, Python, Java, Kotlin or Scala within a day or two if the situation calls for it. Recently did a non-trivial personal project involving the WebRTC standard and I would say I'm reasonably confident in my knowledge of: * Its underlying base protocols (DTLS, SRTP, and SCTP) * Congestion control algorithms * Video encoding involving H.264 and its transport

I help engineering firms, manufacturers, and businesses automate complex workflows through software development, CAD automation, and AI-powered systems. Unlike most developers, I bring 15+ years of professional Civil Engineering experience combined with deep software development expertise. I understand drawings, engineering standards, design workflows, technical documentation, and the operational realities behind engineering projects. My work focuses on delivering production-ready solutions that save time, reduce errors, and automate repetitive processes. What I Do CAD & Engineering Automation • AutoLISP / Visual LISP Development • AutoCAD & ZWCAD Customization • VBA Automation • Drawing Cleanup & Standardization • Block & Attribute Automation • Batch Processing Tools • CAD Standards Enforcement • Legacy Script Debugging & Modernization • Engineering Workflow Automation • AI-Assisted Drafting Systems Software Development • Python Development • JavaScript / TypeScript • React, Node.js, Express, MongoDB (MERN) • REST API Development & Integration • Desktop & Web Applications • Database Design • Data Processing & Automation • Business Process Automation • Custom Internal Tools • Performance Optimization Systems Programming • Compiler Development • Interpreter Development • Language Processing Tools • Parsing & Code Analysis • Algorithm Design & Optimization • Technical Problem Solving AI & Agentic Systems • Claude API Integration • OpenAI API Integration • Claude Code • OpenAI Codex • Custom MCP Servers • Custom Skills Development • Retrieval-Augmented Generation (RAG) • Agentic Workflows • n8n Automation • AI Application Modernization • Multi-Agent Systems Recent Project Types • AutoCAD automation tools that reduce hours of manual drafting work to minutes • Custom engineering workflow systems • Compiler and interpreter implementations • AI-powered engineering assistants • Document and file processing automation • Business workflow automation platforms • Custom web applications and internal tools • CAD standards enforcement systems • Data extraction and transformation pipelines • LLM-powered applications using modern AI stacks Why Clients Hire Me • 15+ years of real engineering experience • Strong software engineering fundamentals • Ability to understand complex technical domains quickly • Production-focused solutions, not demos • Clear communication and reliable delivery • Long-term maintainable code • Available 30+ hours per week

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.

25+ years in Software Development Available for 40-60 hrs./wk. Excellent references from CEOs of the companies. Bringing products to market: inception, spec, architecture, implementation, testing. Seeking for software development projects in the following areas on Windows Platforms: - Recent successful GPT-3/3.5/4 API experience with C#, DALL-E interface, and OpenAI Whisper. - Experience of developing RAG Web Service enabling chatting with private corpus of documents, based on Azure Cognitive Search SDK, Azure OpenAI API and Azure Cosmos Vector DB for vector, hybrid, and semantic search. Segmenting Word/PDF/Excel/CSV/Text documents, embeddings, and ingestion. - Worked with ML.NET in VSTO Outlook Add-In environment for email classification. - Experience with Text-To-Speech and Speech-To-Text using AWS, Azure, Google, Eleven Labs, and other vendors. Experience with Google Voice Services, including Diarization (recognition of different speakers and designation in the transcript), and Medical Transcription. Able to produce STS (Speech-to-Speech) application - interacting with ChatGPT over microphone and speakers. Recent Development Experience of TTS with OpenAI. - AI Training of basic GPT models using fine-tuning, and embedding techniques with vector databases, such as Pinecone, Qdrant, and Milvus APIs. - OpenAI Completion and Embeddings API, GPT-3/3.5/4, Whisper API for Transcribing and Translation - Azure Semantic Kernel, Azure Data Explorer (ADX), Azure Blob Storage, Azure Analytical Services. - AWS Text-To-Speech, AWS Storage - Web Services: REST-API, ASP.NET Framework and Core, WCF Web Services, Microservices - Azure Active Directory Authentication from Desktop Applications in C# - Desktop applications with C#/.NET Framework/.NET Core, WinForms, WPF, DevExpress - Microsoft Office VSTO/COM Add-Ins for Outlook, Excel, Word, and PowerPoint - Client/Server Systems: Sockets and high-level protocols, such as HTTP, FTP, MQTT - Windows Services - Microsoft Dynamics 365 - Hardware Interface: USB/RS232/RS485 Technologies and Frameworks: - Languages: C#, C/C++, Python, MicroPython, XML, JSON - Databases: SQL, SQLite, MySQL, Entity Framework 6/Core and LINQ. - Networking: Sockets (.NET and Winsock), REST API, WCF, HTTP, FTP, MQTT, packet-level TCP/IP, - Serial (RS232/RS485), MODBUS. - IDE: Visual Studio 2010 through 2022 - Office Add-Ins: VSTO Add-ins for Outlook, Excel, Word, PowerPoint. Add-In Express Framework. - VOIP: PJ SIP Stack with DBUS, Asterisk, Open Phone Abstract Library (OPAL) - Active Directory/LDAP/ADSI - Monte Carlo Simulations in C# - Linux: C/C++ and Python with MQTT Development on Ubuntu and Raspbian. - AES256 Encryption, Monte-Carlo Simulations, SHA256, PGP/GnuPG PKI (Public Key Infrastructure) Application binaries signing (Authenticode), Security Certificate generation in code based on CA. - Installers with Advanced Installer, Deployment strategies. - Product Licensing

⭐ 𝑨𝒎𝒐𝒏𝒈 𝑻𝒐𝒑 10 𝑪𝒐𝒎𝒑𝒖𝒕𝒆𝒓 𝑺𝒄𝒊𝒆𝒏𝒄𝒆 𝑻𝒖𝒕𝒐𝒓𝒔 | 3000+ 𝑳𝒆𝒔𝒔𝒐𝒏𝒔 𝑫𝒆𝒍𝒊𝒗𝒆𝒓𝒆𝒅 | 5+ 𝒀𝒆𝒂𝒓𝒔 𝑬𝒙𝒑𝒆𝒓𝒊𝒆𝒏𝒄𝒆 | 𝑺𝒕𝒖𝒅𝒆𝒏𝒕𝒔 𝒊𝒏 40+ 𝑪𝒐𝒖𝒏𝒕𝒓𝒊𝒆𝒔 | 𝑷𝒚𝒕𝒉𝒐𝒏 𝑻𝒖𝒕𝒐𝒓 | 𝑱𝒂𝒗𝒂 𝑻𝒖𝒕𝒐𝒓 | 𝑪++ 𝑻𝒖𝒕𝒐𝒓 | 𝑪 𝑻𝒖𝒕𝒐𝒓 | 𝑪𝒐𝒅𝒊𝒏𝒈 𝑰𝒏𝒕𝒆𝒓𝒗𝒊𝒆𝒘 𝑷𝒓𝒆𝒑 𝑻𝒖𝒕𝒐𝒓 | 𝑫𝒂𝒕𝒂 𝑺𝒕𝒓𝒖𝒄𝒕𝒖𝒓𝒆𝒔 & 𝑨𝒍𝒈𝒐𝒓𝒊𝒕𝒉𝒎𝒔 𝑻𝒖𝒕𝒐𝒓 | 𝙇𝙚𝙚𝙩𝙘𝙤𝙙𝙚 𝑻𝒖𝒕𝒐𝒓 🌟 What My Students Say (based on Reviews on Preply) ⭐️⭐️⭐️⭐️⭐️ “Zain’s explanations in Python & C++ are clear and easy to follow. His teaching style is very informative and easy to understand. He first explains the main concepts and then goes through examples with you". ⭐️⭐️⭐️⭐️⭐️ “The teacher is amazing! He is always prepared for the classes and explains Java concepts very well, asks if I am understanding, does not proceed when there are doubt... ⭐️⭐️⭐️⭐️⭐️ "Zain Makes programming simple and teaches very well. He simplifies the material and explains it clearly." Hi! I’m M. Zain 👋, a Software Enginee with 5+ years of teaching experience in 𝙥𝙧𝙤𝙜𝙧𝙖𝙢𝙢𝙞𝙣𝙜 and 𝙘𝙤𝙢𝙥𝙪𝙩𝙚𝙧 𝙨𝙘𝙞𝙚𝙣𝙘𝙚. So far, I’ve taught 150+ 𝙨𝙩𝙪𝙙𝙚𝙣𝙩𝙨 𝙖𝙘𝙧𝙤𝙨𝙨 40+ 𝙘𝙤𝙪𝙣𝙩𝙧𝙞𝙚𝙨 🌍. ✨ Proven Results with Students ✦ Helped a university student improve from a C grade (58%) to an A grade (89%) in one semester. ✦ Consistently improved learners’ scores by 40–60% on average through structured, interactive lessons. ✦ Guided 15+ students to build and deploy their first full-stack applications, many landing internships afterward. ✦ Coached 20+ O/A Level & IGCSE students, with 90% scoring A or A* in Computer Science & Programming exams. ✨ Certifications & Achievements ✦ Certified in Python Programming, Data Structures & Algorithms, Full-Stack Web Development, and Introduction to Front-End Development (Meta, Coursera). ✦ Winner of multiple coding competitions and hackathons, with top 3 finishes in 5+ national and university-level contests. ✦ Competitive programmer with a Top 10% global ranking on coding platforms (LeetCode & HackerRank). ✨ Teaching Style Engaging, interactive, and results-driven: ✦ Animated Canva slides for visual clarity ✦ Real-world coding projects ✦ Weekly progress tracking & feedback ✦ One-on-one mentorship for problem-solving & interview prep ✨ My secret sauce? Animated Canva slides to help you see the logic, not just read it plus real-world examples and hands-on coding challenges after every session. 👨‍🏫 What I Teach ✦ Programming Languages: Python, Java, C++, C, JavaScript ✦ Core Concepts: OOP, Data Structures & Algorithms, DBMS, Operating Systems, and many more ✦ Databases: MySQL, PostgreSQL, NoSQL ✦ Tools: Git/GitHub, Google Colab, Jupyter Notebook, VS Code, Cursor ✦ MS Office: Word, Excel, PowerPoint ✦ Web Development ✦ Exam Prep: IB, AP, GCSE, IGCSE, and O/A Levels, University Exams / Assignments & Projects 👨‍🏫 Teaching Experience With over 3+ years of teaching programming and computer science, I’ve learned how to turn tricky concepts into “oh, that makes sense!” moments 💡. My approach blends animated Canva slideshows, clear visual aids, and real-life coding examples to make lessons both interactive and memorable. Whether you’re just starting out or tackling advanced topics, I focus on understanding not rote memorization so the concepts truly stick. 🎓 Certifications & Background ✦ O-Level Computer Science = A* ✦ A-Level Computer Science = A ✦ Advanced Programming Coursework (Software Engineering degree, FAST University) 💼 Industry Experience I’m a Full-Stack Software Engineer experienced in building and deploying scalable web applications. ✦ Proficient in React, Node.js, Express, MongoDB, and SQL ✦ Strong foundations in C, C++, Java, Python ✦ Skilled in API development & cloud hosting ✦ Passionate about writing clean code and delivering real-world solutions ✔ Clear Explanations: I break down complex topics like OOP, DSA, and Computer Networks into simple, easy to grasp ideas. ✔️ Engaging Lessons: With animated slides , coding challenges , and real-world examples , learning never feels boring. ✔️ Personalized Approach: Whether you’re a complete beginner or tackling advanced topics, I adjust lessons to your pace and goals. ✔️ Industry Insight: As a Software Engineer, I don’t just teach theory I show you how it’s applied in real projects. ✔ Lifetime Support: Learning with me doesn’t end after class. I’ll always be there to answer your questions and guide you. For me, it’s not about money, it’s about helping you grow. 🤝 Book Your First Lesson Your first session is the perfect chance to see how I teach and how quickly you can start understanding programming concepts. Don’t wait until “someday” to start let’s turn tricky coding problems into aha! moments together. 👉 Book your first lesson today and start learning the smart way!