Full-stack engineer focused on scalable web systems and AI-driven development. I enjoy turning complex ideas into clean, reliable solutions—especially where backend architecture meets LLM capabilities. I care about writing maintainable code, solving real problems efficiently, and continuously improving workflows using AI. Core Skills Frontend: React, Next.js, Vue, Tailwind Backend: FastAPI, Django, Flask, Spring Boot (APIs, microservices) Database: PostgreSQL, MySQL, ORM (Django, SQLAlchemy) Systems: Cloud-native architecture, distributed services AI / LLM Daily use of ChatGPT, Claude, Gemini, DeepSeek (since 2023) Prompt engineering (structured, multi-turn, production-ready) AI-assisted coding, debugging, and testing Tools: Cursor, Copilot, Claude Code Agent Systems OpenClaw, Coze Studio ReAct, tool calling, multi-agent workflows Context engineering & orchestration Additional Python (pandas, NumPy, PyTorch) • Automation & data pipelines • Android development What You Can Expect Clear communication, pragmatic solutions Clean, scalable, production-ready code Fast iteration with AI-enhanced workflows

I am an AI Solutions Architect, RAG Specialist, AI Agent Developer, and Senior DevOps Engineer with over 15 years of cross-industry experience, including automotive, telecommunications, retail, digital agriculture, e-commerce, and enterprise IT consulting. My expertise lies in integrating cutting-edge AI technologies with robust cloud infrastructure to build scalable, reliable, and business-driven intelligent systems. ⸻ 🚀 AI / LLM / Agent Expertise AI Agents & Automation Systems Experienced in designing and building end-to-end intelligent agent workflows using: • n8n, Agno, Composio • LangChain, PydanticAI • Multi-agent collaboration architectures • Enterprise automation & workflow orchestration Retrieval-Augmented Generation (RAG) Deep expertise across the entire RAG stack: • Enterprise knowledge bases • Document ingestion (PDF, HTML, Confluence, SharePoint, email, etc.) • Vector databases (Qdrant, Pinecone, Milvus, LanceDB) • Multi-modal retrieval • Latency/accuracy optimization for production RAG pipelines Large Language Models (LLMs) Hands-on experience with: • Azure AI Foundry / Azure OpenAI • Google Gemini • Anthropic Claude • DeepSeek • Alibaba Qwen (DashScope) Expert in prompt engineering, tool integrations, agent planning, and Model Control Protocol (MCP). Model Deployment & Infrastructure • On-prem / hybrid / cloud model hosting • LLM traffic routing & gateway design • Cost optimization strategies • Enterprise security, audit, and compliance ⸻ 🛠️ DevOps / Cloud / SRE Expertise • Kubernetes: ACK, AKS, EKS, GKE, K3s • Cloud: AWS, Azure, GCP, Alibaba Cloud • IaC: Terraform, Terragrunt, Crossplane • CI/CD: GitHub Actions, GitLab CI, Azure DevOps • Observability: Prometheus, Grafana, Thanos, ELK, CloudWatch • Secure infrastructure: IAM, VPC, RBAC, Secrets management • High availability, auto-scaling, service mesh (Istio / Kuma) ⸻ 💻 Software Development Skills • Backend: Go, Python, Node.js, Java • Frontend: React, Next.js, Vue • API Design: REST, GraphQL, gRPC • Automation: Shell, Python, TypeScript • Databases: PostgreSQL, MySQL, Redis, MongoDB Capable of delivering full life-cycle development from architecture to deployment. ⸻ 🎓 Industry Certifications • AWS Certified Solutions Architect – Professional • Microsoft Certified (Azure Fundamentals & Professional) • HashiCorp Certified: Terraform Associate • Certified Kubernetes Administrator (CKA) • SAFe® 5 DevOps Practitioner ⸻ 🌍 Key Strengths • Strong cross-cultural communication; extensive experience with global teams • Deep understanding of China’s technology ecosystem, compliance, and cloud environment • Ability to bridge business needs with technical execution • Proven record of delivering complex projects with clarity and leadership • Customer-centric mindset with a focus on long-term value ⸻ ⚡ My Value Proposition I help organizations: • Build advanced AI Agent automation systems • Deploy enterprise-grade RAG knowledge platforms • Establish modern DevOps & cloud-native infrastructure • Integrate AI into real-world workflows • Improve engineering efficiency, reduce operational costs, and scale intelligently I specialize in turning complex technical problems into simple, stable, and effective solutions. ⸻ 🤝 Let’s Work Together If you’re looking to enhance your business with AI, automation, or modern cloud engineering, I can help you design and deliver a solution tailored to your goals.

Highly experienced and skilled in linux system, linux kernel and linux system programming. I had served in NXP semiconductor for 7 years, and worked in linux field for more than 15 years. Linux Kernel - Subsystem: KVM Virtualization, Filesystem, Network, USB, Linux Video - Debugging: Performance, System Analysis, Software Debugging, OOPS Embedded Linux - Frameworks: OpenWRT, Yocto, Android - Device Driver: USB, XHCI, WIFI, LTE, Network, Camera Linux System Development - System: Ubuntu, Centos, Archlinux, Raspberry pi, Orange pi - Network: VPN, VXLAN, IPTABLE, Router, Wireguard - Virtualization: Qemu, Libvirt, Virtualbox, Docker, K8s Programming Skills - C/C++ - Bash/Makefile - Android - Python

I build automation and API integrations that solve one clear problem and ship fast — usually with a working demo before you even hire me. Send me a task; I'll often send back a running proof-of-concept. What I deliver: • Web scraping & data extraction (Python, BeautifulSoup, Playwright/Selenium) → clean, structured JSON/CSV • API & system integrations (REST, webhooks, third-party POS/CRM/payment APIs) • Workflow & browser automation, scheduled scripts, headless/cloud runners • AI automation: Claude/MCP servers, LLM-powered tools and agents How I work: fixed scope, async, written updates — no calls needed. Every delivery ships with a short demo video, a written verification report, and handover documentation, so you always know exactly what you're getting and you own it fully. Why trust my architectural choices? Before freelancing, I spent 7 years in backend engineering (Java/Python, distributed systems), most recently as Senior Backend Engineer at a leading global industrial AMR manufacturer, where I independently drove the stability of their core infrastructure. My technical standards are endorsed in a formal recommendation letter signed by the company's CTO — happy to share it via message. Full case studies — with architecture diagrams, verification reports, and real production numbers — are in my portfolio below. You get a freelancer who ships small, working deliverables, not a resume.

Hi, Let's Code Solution Save Money And Make Money For You！！ A No-nonsense Full Stack Developer and UI Designer with 13 years experience. —Only Offer a Save Money + Make Money golden solutions —With transparent pricing ,no need to compare quotes. Services cover websites, mobile apps, e-commerce platforms, AI agents, and more, with transparent pricing for worry-free collaboration. --------------------------------------------------Core Skills-------------------------------------------------- 1.Full-Stack Development & Frameworks PHP (including CakePHP, Laravel), MySQL, HTML5, CSS3, Bootstrap, pure JavaScript, Flutter, Java, Kotlin, Python, Dart, Go 2.CMS & E-Commerce Platforms WordPress (plugin and theme development), Shopify (store setup, theme customization, app installation), Magento (theme development, customization, multi-store management), Wix, Webflow, Squarespace, Weebly 3.AI Agent Development General-purpose agents: expense reimbursement, HR recruitment, content operations, customer lead acquisition, etc. Business-customized agents: advertising campaigns, social media marketing, finance, healthcare, education, etc. Using AI agents to help enterprises reduce R&D costs by over 50%, and assist clients in boosting productivity by 100% through intelligent roles. 4.Business Application Development Corporate websites / brand showcases E-commerce platforms / product sales Appointment/subscription services (beauty, fitness, food ordering, etc.) Online education / course platforms Internal enterprise systems (CRM, ERP, OA, etc.) Mini-program promotions / landing pages for lead generation Content display / blogs / communities 5.Algorithms & Big Data Spring Cloud, Redis (customized), Spark, MP, Druid, etc. Responsible for designing and architecting a ToC project that scaled from zero to 30 million daily active users, with practical experience in ultra-high concurrency recommendation systems. 6. 3D Engine & AI Animation Design and development of 3D animation engines (including patented camera algorithms), traditional 3D animation modeling and rigging workflows. Designed a text-driven 3D animation generation system with GPU concurrency scheduling and miner deployment experience. 7.Advertising & Marketing Experience 7 years in an advertising company, proficient in SEO optimization, ad campaigns, and traffic acquisition with rich hands-on digital marketing experience. --------------------------------------Project & Experience Highlights--------------------------------------- Designed and delivered multiple AI agents and software/hardware projects across finance, HR, marketing, healthcare, and other domains. Built microservice architectures and high-availability systems supporting global ultra-high concurrency. Skilled in cross-platform development using Flutter, Java, Kotlin, and Python. Leading algorithm and engineering experience in the AIGC (AI-Generated Content) field. -------------------------------------------------Technical Keywords------------------------------------------- WordPress | Shopify | Wix | Webflow | Squarespace | Magento | Laravel | PHP | Go High Level | Flutter | Java | Kotlin | Python | Redis | Spark | Docker/K8S

AI Backend & System Engineer | Python | High-Performance Architectures Hi, I'm YuHang — I engineer production-ready AI voice systems and agentic workflows, not just basic wrappers. ━━━━━━━━━━━━━━━━━━━ 🏆 PROOF OF WORK (Not Just Words) I am the creator and maintainer of a highly popular open-source AI voice middleware: • ⭐ 200+ GitHub Stars • 📦 10,000+ Downloads / Tens of thousands of users globally • 🔄 30+ Versions shipped (active development) • 💬 Built entirely by me — architecture, backend, frontend, and Telegram Bot integration. 👉 My GitHub Repo: Search for "haide-D/SillyTavern-GPT-SoVITS" on GitHub This is a full-stack system integrating LLM context engines, real-time WebSocket voice streaming, Telegram Bot APIs, and a custom admin dashboard. ━━━━━━━━━━━━━━━━━━━ ✅ WHAT I BUILD BEST • Voice AI & TTS Chatbots: Integrating cutting-edge models (like GPT-SoVITS, ElevenLabs) into chat applications. • Real-Time Voice Streaming: Building WebSocket + VAD (Voice Activity Detection) pipelines for ultra-low-latency, human-like voice interruptions. • Telegram / Discord Bots: Deep integrations with async state machines and remote control triggers. • LLM Agentic Workflows: Creating "Live Character Engines" that dynamically trigger behaviors (like auto-calling or eavesdropping) based on conversation context. • Python Backend APIs: Fast, scalable FastAPI backends with MD5 smart caching (under 10ms response) and zero GPU footprint on cache hits. ━━━━━━━━━━━━━━━━━━━ ⚡ WHY CHOOSE ME Most developers just know how to call the OpenAI API. I know how to engineer the complex systems around it. Before going independent, I spent a year as a backend engineer at Huawei Cloud. I know how to write clean, enterprise-grade code (Java/Spring Boot/Python), optimize databases, and build systems that don't crash when traffic spikes. I deliver complete, documented systems with full ownership. Let's talk about your project — I'll give you an honest technical assessment within 12 hours. 🚀

I help clients build reliable Python automation, web scraping, data-cleaning, and Supabase/PostgreSQL workflows. My strongest work is turning messy public websites, documents, spreadsheets, and APIs into clean data pipelines with verification, clear handoff files, and production-safe updates. Core technical work: - Python web scraping and browser automation with Selenium/Playwright-style workflows - Supabase/PostgreSQL data pipelines, ETL, source adapters, duplicate/canonical review, and QA reports - PDF/document extraction, public-source monitoring, GitHub Actions runs, and post-upload verification - Excel/VBA/Selenium automation for ecommerce product data and workbook processing - GIS/data workflows where accuracy, QA output, and documentation matter Recent automation work: - Built a Python + Supabase public-source pipeline with 18+ source adapters, document/PDF extraction, duplicate review, GitHub Actions runs, and production verification - Delivered ecommerce product-data extraction and workbook automation with clean specs and reusable scripts I also work as a Visual Designer. I have a Master of Architecture (MArch) background from Tongji University, so I bring strong composition, spatial judgment, layout, lighting, and presentation discipline to client-facing visuals. Design support I can add when useful: - Product/lifestyle visuals for Shopify, ecommerce, ads, social, and landing pages - Hero banners, editorial images, mood boards, product-detail tiles, diagrams, maps, and presentation boards - AI-assisted image direction and review: prompt systems, clean crops, no fake logos, consistent style, and believable lighting/materials My workflow is simple: clarify the target output, build a small proof first, verify edge cases, then deliver clean final files with notes so the work is easy to review, reuse, and maintain.

I build reliable Python automation and API integrations for teams that need to move data between forms, CRMs, spreadsheets, databases, and internal tools. I can help you with: - Building FastAPI services and REST API integrations - Creating n8n workflows with validation, routing, and approval steps - Automating data collection, cleaning, deduplication, and export - Connecting workflows to PostgreSQL, Google Sheets, and external APIs - Implementing secure webhooks with signature verification and idempotency - Adding retries, failure notifications, replay tools, and audit trails - Documenting workflows so your team can operate and extend them Relevant portfolio work includes: - An n8n lead-routing system with PostgreSQL persistence, deterministic scoring, deduplication, approval routing, bounded retries, and manual replay, verified by 25 passing Playwright acceptance tests - A Python data orchestration pipeline with pluggable adapters, checkpointed state, deduplication, CSV and Google Sheets outputs, and 61 automated tests - A webhook reliability console demonstrating HMAC verification, idempotent processing, deterministic retries, Dead Letter recovery, and manual replay - A FastAPI workflow application with structured validation, human approval, traceable decisions, and stable API error handling For each project, I define the scope, access requirements, milestones, and acceptance criteria before implementation. You receive maintainable code, automated tests, setup instructions, and clear handoff documentation. I communicate progress clearly and surface API limitations, rate limits, and integration risks early. My goal is to deliver an automation system your team can understand, operate, and trust.

I am a seasoned full-stack developer with a strong focus on AI-powered interactions—including AI chatbot development, conversational UX, and intelligent agent integration. I build products from 0 to 1 and quickly diagnose issues in existing systems to improve performance, user experience, and business impact. I deliver maintainable, scalable, and deployable software with end-to-end ownership. Core Expertise (AI & Full-Stack) AI & Intelligent Interactions – Design and implement AI chatbots, voice/text assistants, and natural language interfaces. Integrate LLMs (GPT, Claude, open-source models) with RAG, fine-tuning, and prompt engineering for domain-specific use cases. Build real-time conversation flows, context management, and fallback strategies that feel human and reliable. End-to-End Product Delivery – From discovery and prototyping to deployment and monitoring. I own the full lifecycle, ensuring clean architecture, scalable systems, and predictable timelines. Rapid MVP & Iterative Development – Turn ideas into working products quickly, then iterate based on data and user feedback. Legacy System Stabilization & Refactoring – Improve performance, reduce technical debt, and modernize outdated codebases without disrupting business operations. Frontend-Backend Synergy – Optimize API design, state management, and real-time data flows for seamless UX. Data-Driven & AI-Enhanced Products – Implement analytics, recommendation engines, and AI capabilities that drive engagement and conversion. Tech Stack Frontend: HTML, CSS, JavaScript, TypeScript, TailwindCSS, React/Next.js, Vue/Nuxt.js, Angular Backend: Python (Django, Flask, FastAPI, Scrapy, Scikit-learn), Node.js (Express, Nest.js) Java: JSP, Spring Boot, Nacos, MicroService, JPA, MyBatis, MyBatis-Plus C#: ASP.NET WebForms, ASP.NET MVC, Razor Pages, .NET Core, Entity Framework, Dapper, WinForms PHP: Laravel AI/LLM: LangChain, LlamaIndex, OpenAI API, Anthropic, Hugging Face, vector databases (Pinecone, Milvus, Weaviate), RAG pipelines, conversational memory, speech-to-text / TTS Databases: MongoDB, MySQL, PostgreSQL, SQL Server, Firebase, SQLite Cloud & DevOps: AWS EC2, Microsoft Azure, Docker Collaboration: Git, SVN, Jira, Slack Mobile: Flutter, Ionic, Capacitor, uni-app, Taro How I Work Clear communication, predictable delivery, and transparent progress. I provide daily updates, early risk detection, and flexible engagement—feature-based, milestone-based, or long-term partnerships. I treat your business goals as my own and ensure every line of code adds value. Highlights Projects: SaaS platforms, internal enterprise systems, data-driven web apps, and AI-powered chatbots/assistants for customer support, sales, and internal knowledge retrieval. Accomplishments: Delivered MVPs under aggressive deadlines, stabilized legacy systems with 40%+ performance gains, and launched AI chatbots that reduced support tickets by 30% while improving user satisfaction. If you need a full-stack developer who deeply understands AI interactions and can own delivery from concept to production—with uncompromising quality—let’s talk. I’m ready to build your next intelligent product.

15 years of Internet development experience, mainly good at back-end development.I have practical experience in online recruitment, e-commerce, ERP systems, mobile game SDKs, payment systems, and web scraping systems. Professional skills 1. Can independently complete the design and development of web application systems based on B/S mode. 2. Proficient in PHP and Python applications, familiar with HTML, CSS, Vue. 3. Familiar with PostgreSQL and MySQL databases, proficient in writing SQL statements and stored procedures.