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🤖 I build AI agents that survive production, not demos. Python, Node/TypeScript, LLM APIs, and the backend architecture that holds them up. ⬆️ Why clients pick me: 10+ years shipping backend & realtime systems · 15M+ users served · Top Rated Plus · 100% Job Success · 1500+ hours delivered · ships on time (deadlines are real, drama isn't) 📚 Most "AI developers" can wire up an API call. The hard part starts right after: state, memory, retries, rate limits, token cost, tool orchestration — and what happens when 10,000 users hit it at once. I spent a decade building realtime systems that stayed up under millions of concurrent users. That's exactly where most AI projects break. 🚀 HIRE ME IF YOU WANT: ✅ 🤖 Agentic systems → multi-step agents, tool & function calling, MCP servers, LangChain/LangGraph, orchestration, guardrails, human-in-the-loop ✅ 📚 RAG pipelines → ingestion, chunking, embeddings, vector DBs (pgvector, Qdrant, Pinecone), hybrid search, eval loops that catch regressions ✅ 🧠 LLM integration → OpenAI, Anthropic, open-weight models; streaming, structured outputs, prompt & cost optimization, provider fallback routing ✅ ⚙️ Backend architecture → Python (FastAPI) & Node/TypeScript, REST & WebSocket APIs, queues & background workers, SQL/NoSQL, Redis, caching ✅ ⚡ Realtime & scale → WebSockets, event-driven pipelines, latency tuning, load handling under real traffic ✅ 🔄 Automation → scraping, data pipelines, internal tools, dashboards, custom & n8n workflows ✅ 🚢 Ship and run it → Docker, CI/CD, GitHub Actions, AWS/Azure, Coolify, logging & observability ✅ Workflow: Git, GitFlow, clean code, TDD. Future you appreciates it. So does your team. 🤝 HOW WE WORK You own everything: all source, all repos, all IP. No black box: documented, tested code your team can pick up. Archaeologists won't be needed. No lock-in: standard Python/Node and swappable model providers — you're never dependent on me, or on one LLM vendor's pricing. Plain language: not technical? Fine. I work with founders daily, jargon-free. If you need an AI feature that holds up with real users and a backend that doesn't fall over when they show up → let's talk. AI Engineer, AI Agent Developer, LLM Developer, OpenAI API Integration, Anthropic Claude API, RAG Chatbot, LangChain, LangGraph, MCP Server Development, Python FastAPI Developer, Node.js TypeScript Backend, Backend Architect, API Development, Automation Engineer, n8n, Web Scraping, Realtime WebSocket Systems, Vector Database, AI Integration, Game Backend, Unity Multiplayer

Senior .NET Developer with 20+ years of experience building, fixing, modernizing, and extending business applications using C#, ASP.NET Core, Blazor, SQL Server, Web API, WinForms, WebForms, Telerik, DevExpress, and .NET Framework. I specialize in complex .NET business systems: solving production bugs, improving performance, optimizing SQL Server databases, modernizing legacy .NET applications, and adding reliable new features without breaking existing workflows. Available for small bug fixes, legacy system maintenance, SQL performance tasks, API integrations, and long-term .NET development. What I can help you with: 🔹 .NET Backend & Web Development * C# development, .NET development, ASP.NET Core, ASP.NET MVC, Web API, and REST API * Backend development, API integration, third-party integrations, and business application development * Entity Framework, EF Core, LINQ, ADO.NET, repositories, migrations, and data access layers * Authentication, authorization, role-based access, and secure business workflows 🔹 Blazor & Modern Web Applications * Blazor Server, Blazor WebAssembly, Blazor WASM, Blazor PWA, and Razor components * Business dashboards, admin panels, internal tools, reporting interfaces, and workflow systems * Telerik UI for Blazor, Telerik Reporting, TRDX reports, and custom reporting solutions 🔹 SQL Server & Database Performance * SQL Server development, database design, T-SQL, stored procedures, views, triggers, and functions * Query optimization, indexing, performance tuning, slow report troubleshooting, and database refactoring * Data migration, database cleanup, reporting databases, and business data structures 🔹 Legacy .NET Modernization * ASP.NET WebForms, ASPX applications, .NET Framework applications, WinForms, and WPF * Legacy application maintenance, bug fixing, refactoring, and safe modernization * Migration from older .NET Framework systems to modern .NET, ASP.NET Core, Blazor, or API-based architecture * DevExpress WinForms, Telerik components, desktop UI modernization, and reporting system upgrades 🔹 Automation, Integration & AI * OpenAI API, ChatGPT API, AI integration, chatbot features, and AI-powered business tools * Web scraping, Puppeteer automation, browser automation, API scraping, and data extraction * RabbitMQ, background services, Windows Services, scheduled jobs, CQRS, modular systems, and workflow automation I have hands-on experience with accounting software, sales systems, warehouse and inventory systems, treasury systems, CRM, ERP-style applications, healthcare systems, reporting platforms, admin panels, dashboards, and other database-driven business applications. Why clients work with me: ✅ 20+ years of practical software development experience ✅ Strong debugging and root-cause analysis skills ✅ Experience with both modern .NET and legacy .NET Framework systems ✅ Ability to understand large existing codebases and improve them safely ✅ Strong SQL Server, reporting, backend, and business application experience ✅ Clean, maintainable, stable, and performance-focused solutions ✅ Focus on reliability, long-term maintainability, and real business needs Typical projects I can support: * Build a new ASP.NET Core, Blazor, or Web API application * Fix bugs in an existing .NET, WebForms, WinForms, WPF, or SQL Server system * Modernize legacy .NET Framework applications * Improve SQL Server performance and slow reports * Add new modules to accounting, inventory, CRM, ERP, or internal business systems * Integrate third-party APIs, payment services, AI tools, or automation workflows * Maintain and extend long-running business applications safely Core technologies: Web Developer, Desktop Developer, Web App Developer, Desktop App Developer, C#, .NET, .NET Core, .NET Framework, ASP.NET Core, ASP.NET MVC, ASP.NET Web API, Web API, REST API, Blazor, Blazor Server, Blazor WebAssembly, Blazor WASM, PWA, WinForms, Windows Forms, WPF, WebForms, ASPX, Entity Framework, EF Core, ADO.NET, LINQ, SQL Server, T-SQL, Stored Procedures, SQL optimization, Telerik, Telerik UI for Blazor, Telerik Reporting, DevExpress, DevExpress WinForms, RabbitMQ, CQRS, Windows Services, background services, Puppeteer, browser automation, web scraping, API integration, OpenAI API, ChatGPT API, and AI integration. If you need a senior .NET developer, C# developer, ASP.NET Core developer, backend developer, Blazor developer, SQL Server developer, desktop application developer, Web API developer, Telerik developer, DevExpress developer, web scraping developer, or legacy application modernization specialist, I can help you build, fix, optimize, or modernize your application.

Most of my clients don't start from zero. They already have a CRM, a site, a spreadsheet workflow, half an app, and a developer who left mid-project. What they don't have is one person who can look at all of it, tell them honestly what's worth keeping, and then build the missing piece so the whole thing actually works. That's the job I do. 10+ years, 70 completed Upwork projects, Top Rated. I work solo — the person you brief is the person writing the code, and the person you can still reach in six months. WHAT CLIENTS USUALLY COME TO ME WITH "We're doing this by hand and it's eating our week." Quote generation, invoicing, onboarding, report building, data entry between two systems that don't talk. I map the process, automate the parts that should never have been manual, and leave you with something that runs on a schedule and tells you when it breaks. Python, REST APIs, scheduled jobs, AWS. "These systems need to talk to each other." HubSpot, Salesforce, Shopify, Stripe, QuickBooks, Zoho, Google Sheets, Slack, and whatever internal tool you're running. Two-way syncs, webhooks, custom middleware, and the edge cases nobody documents — duplicate records, failed writes, rate limits, partial syncs. This is most of what I do and it's what I'm best at. "We need the actual product built." Custom web apps and SaaS platforms in React, Next.js, Node.js, and Python — database design through to deployed, monitored production. Client portals, internal tools, dashboards, booking and billing systems. Most recently I built a full SaaS platform for the US bail bond industry: client intake, automated document generation across 200+ legal forms, compliance workflows, and billing. "We want AI in this, but something that actually works." LLM agents, RAG pipelines, and chatbots on Claude, OpenAI, and Gemini — wired into your real data and your real systems, not a demo that impresses once. Document extraction, intake triage, support deflection, internal search. I'll also tell you when AI is the wrong tool for what you're describing. "Someone built this and now it's broken." Inherited codebases, half-finished projects, integrations that silently fail, scrapers that stopped working, systems nobody documented. I'll audit what's there, tell you what's salvageable and what isn't, and give you a fixed scope before you commit. "We need this data." Large-scale extraction and ETL with Playwright and Scrapy — JS-rendered pages, logins, anti-bot, proxy rotation. Clean output, on a schedule, in whatever format your systems consume. HOW I WORK I map the process before I write code. Including the spreadsheet everyone secretly relies on. Most projects go sideways because nobody did this first. I answer the business question, not just the ticket. If you want a dashboard, what you actually want to know is where deals are getting stuck. I'll build for the second one. I build for the handover. Migrations, error handling, retries, backups, documentation. You end up with something your team can run, extend, and hire around — without me. I tell you when I disagree. If your approach won't hold up, or the project isn't a good fit for me, you'll hear it before you pay for it rather than three weeks in. STACK Python | Node.js | React | Next.js | PostgreSQL | REST APIs & webhooks | Docker | AWS (Lambda, EC2, S3) | Playwright / Scrapy | Odoo | LLM integrations (Claude, OpenAI, Gemini) Message me with what you have now, what it should do instead, and where it's failing. You'll get an honest read on scope, a realistic timeline, and a number — usually the same day.

10+ years in IT and software development. * Blockchain area dev, Smart Contracts and the like * Web full-stack development, primarilly, but not only, backend (Rust, Elixir/Erlang, Go) * Software design and architecture

I'm a full stack developer and a PHP expert. You may expect high quality results from me on these kind of jobs below; - Back-end Development - API Service Development - WordPress Plugins Development - WordPress Errors Fixing - Website Development - Laravel Projects Development - Symfony - CodeIgniter Projects Development - Telegram Bot Development - Custom Plugins Development and Errors Fixing for OpenCart, WHMCS and PrestaShop If you are looking for a confident, skilled and experienced developer please don't hesitate to write to me! I look forward to hearing from you.

I build and integrate backend APIs using C#, ASP.NET Core Web API, SQL, PostgreSQL, and REST-based services. I can help with third-party API integration, REST API development, backend bug fixes, database-connected endpoints, authentication-related tasks, Swagger/OpenAPI documentation, and API testing. My portfolio includes an ASP.NET Core Weather API Wrapper with external API integration, Redis caching, standardized error handling, Swagger documentation, and HTTP resilience policies such as retry, timeout, and circuit breaker. I also have an e-commerce API project using ASP.NET Core, Entity Framework Core, PostgreSQL, JWT authentication, and Docker Compose. Services I can help with: • ASP.NET Core Web API development • Third-party API integration • REST API design and implementation • SQL / PostgreSQL backend work • JWT authentication • Swagger / OpenAPI documentation • API testing and debugging • Backend maintenance and bug fixing I focus on readable code, practical implementation, and clear communication.