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I **define the architecture**. For 21 years, I've been the person CTOs and lead developers call when systems fail under load, migrations are at risk, or AI integration needs to work right the first time. With expertise in **C#, .NET, Blazor, ASP.NET Core, SQL, Python,** and production AI agents (**Semantic Kernel, LangGraph, custom tool-calling**), I design systems where performance, reliability, and intelligent automation aren't optional—they're the baseline. I've shipped AI to **production** — not to a Jupyter notebook. I'm the creator of **FreeAIVoice** — a live AI voice platform with AI Voice Generation, Voice Cloning, and Speech-to-Text across **30+ spoken languages** and a developer API. I provided production systems for The New York Times. --- **Here's where I'm most useful to you:** - **The AI Integration Trap** — You've been asked to add AI to your existing .NET system but don't know whether to use *Semantic Kernel*, raw OpenAI APIs, or a Python sidecar. I've made that decision dozens of times. I'll make it faster and safer for you. - **The Blazor Bottleneck** — Your Blazor app is slow, state management is tangled, and you're unsure if you chose *Server or WASM* incorrectly. I can diagnose what went wrong and map a clean path forward — often in a single session. - **The Legacy Modernization Cliff** — You have a 10-year-old .NET system that needs AI or modern tooling but wasn't designed for it. I specialize in *incremental refactoring paths* that don't require a full rewrite and don't break what's already working. --- **What I Do Best:** - **Software Architecture & System Design** — scalable, maintainable systems from greenfield to enterprise - **AI Agent Development** — production-grade agents with Semantic Kernel, LangGraph & AutoGen — *not demos* - **Blazor & ASP.NET Core** — Server, WASM, hybrid — full-cycle development and performance tuning - **Python & AI Automation** — RAG pipelines, workflow automation, voice AI, LLM integrations - **Legacy .NET Modernization** — refactoring strategy, migration paths, incremental upgrades - **Architecture Audits** — identifying structural risk before it becomes a production incident, not after - **Debugging Complex Systems** — when the stack trace doesn't tell the whole story **If any of this sounds like your current situation — DM me. I respond to every message.**
I'm a skilled developer in a large number of different computer specialties. Can do everything from building and installing servers to programming in more languages than you probably knew exist.
I've been teaching programming since 2018 to people of different ages. I'm specialized mostly in teaching how to start programming from scratch: basics of programming languages + basics of computer science. But I always have in mind a long-term perspective for my students and try to develop useful skills just from the start of our work.
Experienced Full Stack & Blockchain & AI/ ML Developer with 10+ years of success building decentralized, real-time web applications and optimizing legacy systems. Specialized in EVM smart contract development, crypto payments, and Web3 integrations (Metamask, WalletConnect, Coinbase Wallet). Also Specialized in LLMs (GPT-4, LangChain, Haystack), RAG pipelines, and intelligent agent workflows. Proven track record in modernizing codebases, scaling blockchain infrastructure, and enhancing UI/UX fsor Web3 ecosystems. Adept at Solidity, Node.js, Golang, React, and cloud-native DevOps. Passionate about revolutionizing digital experiences in music, finance, and identity through blockchain..
I love working with medical technology or anything on the web. I also enjoy ballroom dancing and riding the unicycle. I look forward to working with you!
I'm Matei, a full-stack developer with over 10 years of experience, specializing in JavaScript, React, and Node.js. I help developers at all levels overcome challenges, from debugging complex issues to understanding core concepts. My approach is patient and tailored to your needs, ensuring you gain confidence and clarity in your coding journey. Format: - regular (long term) or one-time - for any level (beginner/intermediate/advanced) - personalized take-home tasks & resources - 45-90min sessions, up to 6hrs/day on request Availability: - 4:00-18:00 UTC on workdays - irregular on weekends - last minute or late night sessions on request (email matei@copot.eu) Technologies: - JavaScript: ESNext, NodeJS/Deno, TypeScript, React, Vue, NodeMCU, & more - Front-end Web Dev: HTML5, CSS3, responsive design, PWAs, SPAs, & more - Back-end Web Dev: Express/NextJS APIs, Python, AWS, Docker, SQL, PHP, & more - App Dev: Mac/Linux & Android, Electron, Expo, Python, Stripe, UX, & more - others: always curious about other technologies, e.g. haskell, ruby, WASM, WebGL... = Why me? I'm typically paid €100/hr by top companies, so the lower rate here means you're getting top-tier expertise at an accessible price. I enjoy mentoring because it brings variety and a more collaborative and relaxed dynamic. I have a proven track record of guiding learners from zero experience to landing high-paying jobs. My teaching adapts to your pace and goals: you'll always get honest, actionable advice, including what's realistic and what's not. If you're serious about growing your skills or career in tech, I'd be glad to support your journey.
I have been working in the industry for the past 12 years as Fullstack developer, Java specialist and Application Architect. I am passionate about Spring boot microservices and constantly strive to write clean code with best practices invloved. I work on following stack: **Backend**: - Spring 6.0, Spring Boot - Spring Webflux - Spring Cloud, Spring Microservices - Java 21 - RESTful API's - Apache Kafka - Spring Security - OAuth 2.0 - Websockets **Frontend**: - Angular - NgRx - RxJs - PrimeNG - Bootstrap - HTML - CSS - Javascript **Databases**: - MongoDB 4.4/5.0 - SQL databases **DevOps**: - Kubernetes - Ansible - Docker - Git, svn, P4v **Design**: - UML, - Object oriented Modelling, - Swagger/ OAS 3.0 - JSON API Specs
For over 21 years I have been a self employed software engineer. I work with my clients to take their ideas from conception all the way to final delivery. I have started three businesses which provides me the unique opportunity to see things from both the business and development perspectives. I love discovering how things work and I'm excited to share my discoveries with you. I am patient with everyone around me and enjoy coming up with ways to explain things in an easy to understand way.
I use Rust every day. Well-versed in resolving dependency tree issues. Server-side programming, profiling, concurrent programming. Cross-platform compilation. WebAssembly interop from scratch or generated bindings. Cloudflare Workers. Tests. Bevy. Processing of huge datasets. Always up-to-date. I read code and do my research but I'm not afraid to ask. I produce clean PRs / commits that build.
Over 20 years experience with primary discipline in Microsoft technologies. Highly experienced with C#, .NET Framework, .NET Core, Winforms, ASP.NET/MVC, Web API, Azure, SQL Server. Also have experience with Rust and WebAssembly (WASM) as well as home automation solutions using Raspberry Pi and Windows IOT Core.
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