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I am a seasoned IT System Engineer with a broad coding background and a proven track record in setup systems and softwares, designing and managing robust infrastructure. My core expertise lies in: ✅Systems & Virtualization: Deep proficiency in Linux, server hardware, and virtualization technologies. ✅DevOps & Cloud Practices: Skilled in implementing DevOps principles, with experience in networking, DNS, and storage (RAID) solutions. ✅Embedded & IoT: Hands-on experience in embedded systems and IoT projects, from prototyping and soldering circuit boards to coding. My tech stack： • C, CPP, MIPS Assembly, QEMU and TCG Dev, Linux distro porting • RHEL/CentOS/RockyLinux, Debian/Ubuntu, LoongArch Linux • Apache, Nginx, MySQL/MariaDB, PHP, PHP-FPM, CA and SSL • Python, Java, Objective C and iOS • VMware vSphere, pfSense/OPNSense, OpenWRT, Prometheus, Cockpit • Gitlab, Apache Subversion, Redmine, Jenkins, Docker • NextCloud, ownCloud A Comprehensive Technical Ecosystem: My experience is unified by a deep commitment to Free and Open-Source software. This spans the entire stack: from porting systems for IC design to operating GNU/Linux clusters; from server-side coding to mobile development; and from troubleshooting complex networks and RAID to implementing open-source alternatives to proprietary suites like Google Worksapce and Microsoft 365. End-to-End Solution Delivery: I leverage this broad skill set to deliver complete solutions—whether it's applying foundational knowledge (like that of Internet root servers) to configure complex DNS for a new business site, or developing strategies to enhance efficiency by migrating to public clouds or building cost-effective private clouds. Beyond technical know-how, I am driven by a passion for understanding the "why" behind systems. I am a meticulous professional who prioritizes client success through proactive communication and a detail-oriented approach. With an A-to-Z understanding of computers and networks, complemented by management experience, I am poised to deliver reliable and efficient service.

I am an experienced Linux administrator. I have 15+ years of experience in Linux system administration and problem-solving. I can troubleshooting all kinds of linux issues, centos migration, centos/ubuntu crash rescue, investigate server performance issue and web server administration. Skills & Deliverables: Cloud Infrastructure & Dedicated VPS Setup (AWS, DigitalOcean, Hetzner, Contabo, Linode etc) Building secure, high-performance servers with proper backup, and automation. Linux Administration(Centos, Ubuntu, Debian, Rocky Linux, Almalinux) Performance optimization, monitoring, troubleshooting, log analysis, and uptime management. Server migration(Centos, Ubuntu, Debian, Rocky Linux, Almalinux) Secure migration of data and app between different servers. Web Server Trouble-shooting Slow server, website troubleshooting and optimization Recurring downtime issue troubleshooting and fix. Centos7 server migration Upgrade centos7 to almalinux 8 or 9. Migrate data&apps from centos7 to Ubuntu/Debian/Rocky/Almalinux Server Upgrade(Centos, Ubuntu, Debian, Rocky Linux, Almalinux) Upgrade ubuntu 14 16 18 20 22 to the latest version. Upgrade Debian , Rocky Linux, Almalinux to the latest version Server rescue(Centos, Ubuntu, Debian, Rocky Linux, Almalinux) Fix linux system crash, file system corruption. Security & Compliance Firewall configuration, access control, TLS/SSL, patching, vulnerability prevention. Backup & Disaster Recovery Strategy Automated backups, retention policies, restore testing, failover planning. Application Hosting & Migration WordPress, Prestashop, Forum app, Node.js, Python apps — smooth migration without downtime. Email Infrastructure & Deliverability Improvement Domain authentication setup (SPF / DKIM / DMARC), inbox placement, fixing spam issues. Why choose me? - Strong skills and extensive experience , can work independently and efficiently , able to fix complex issues - Fast and clear communication, detail and solution oriented - Honest and proactive work ethic

Professional and academic background on Performance optimization high throughput(10K+ transactions/second)system and large databases (10TB+). expert on APM( Application Performance Management & Monitoring) system, IoT(Internet of Things) system, online video and office document play system.familiar with manage and monitor k8s cluster.familiar with Design pattern,Domain-Driven Design and use that software design thinking to improve software more High-cohesion,loose coupling, flexible,extensible,easy to maintain. java: SpringBoot, mybatis,hibernate,elasticJob php: laravel ,wordpress frontend:vue,Bootstrap,jquery,css,html database:Mysql, PostgreSQL, Oracle NoSQL: Redis, mongoDB, elasticsearch; midware: rocketmq,kafka,hadoop,NFS,iFFmpeg,minio

✅ I am a Top Rated Plus Database Consultant on Upwork with over 100 5-star client reviews, backed by 13+ years of enterprise experience and a 100% commitment to your success. Instead of just keeping the lights on, I solve complex customer-facing database bottlenecks, architect zero-downtime migrations, and make massive performance improvements for mission-critical systems. My career spans managing over 8,000 production databases and 500TB+ of data for fast-growing SaaS platforms, FinTech companies, and global enterprise organizations. ⭐ Here's what I can bring to your project (Validated by vendors and trusted by hundreds of clients): ✅ Deep Multi-Engine Expertise: Mastery across PostgreSQL, MySQL, SQL Server, MongoDB, and Oracle. ✅ Cloud Database & RDS Architecture: Extensive hands-on experience migrating, scaling, and optimizing managed database workloads across AWS (RDS/Aurora), Google Cloud (Cloud SQL), and Azure databases. ✅ AI & Vector Database Architecture: Expert in designing scalable schemas for massive AI workloads and tuning vector extensions (e.g., pgvector with HNSW & IVF indexing) for millisecond-latency cosine similarity searches. ✅ Extreme Performance Tuning: Rapidly diagnosing CPU spikes, slow queries, and index inefficiencies to restore lightning-fast performance. ✅ High Availability & DR: Architecting bulletproof clusters (Always On, InnoDB Cluster, Patroni, HADR) to guarantee zero data loss. ✅ Vendor-Certified & Client-Proven: My technical methodologies are not just theoretical—they are backed by premium official certifications from AWS, Oracle, Cisco, PMP, TOGAF, and ITIL, and have successfully empowered hundreds of businesses globally. ✅ Enterprise Security & Compliance: Strict adherence to data security best practices when handling sensitive financial and operational data. ✅ 24/7 Ultra-Reliable Communication: You will never be left in the dark; you will always know the exact status of your production systems. ⭐ Why you should choose me over other freelancers: ✅ Broad Vision, Deep Focus: Unlike single-engine DBAs, my multi-platform expertise allows me to choose the absolute best architectural solutions for your specific business needs. ✅ Over-Delivering: This is core to my work ethic. I don't just close tickets; I identify root causes and optimize your infrastructure so the problem never happens again. ✅ Earning Your Trust: My primary goal is not just completing a contract, but becoming the reliable technical partner your business can always count on. Let's discuss how we can secure, optimize, and scale your data infrastructure. Send me an invite, and let's get to work!

I have 15 years of experience in full-stack development and system architecture, and have successfully built multiple high-concurrency, high-performance, highly available, and scalable systems across various industries. I have particularly deep expertise in e-commerce platforms and cloud-native architectures. I am proficient in Java, Python, and React, and have extensive experience with Spring Boot,Django and microservices architecture. I have a strong understanding of core middleware technologies, including databases, caching systems, message queues, and file storage. In addition, I am highly experienced with AWS cloud services and skilled in leveraging various CI/CD tools to enable continuous delivery and efficient deployment. Throughout my career, I have held several key technical positions, including: Falcons E-commerce Platform: Lead Architect / Senior Engineer OPPO E-commerce Platform: Senior Software Engineer / Product System Architect JD Indonesia (JD.ID): Senior Software Engineer / Promotion System Architect In these roles, I led backend architecture design, including overall microservices system design and DDD-driven microservices architecture, as well as system performance optimization and internationalized platform development, ensuring stable and reliable system operation under high-concurrency scenarios.

I'm Huanqing Zhu, and you can call me Fusion. With over 10 years of hands-on Java development experience—including 6 years dedicated to big data processing and visualization—I’ve built my expertise by staying rooted in frontline coding, even as my responsibilities have grown. A key pillar of my technical toolkit is ‌6 years of production-grade Rust development experience‌, complemented by proficiency in Java, Scala, JavaScript, HTML5, and a full stack of big data and cloud-native technologies: Apache Spark, Hadoop, Hive, Flume, HBase, Storm, Kafka, DataX, ECharts, Docker, Kubernetes, and Linux. What sets me apart is that I’ve never stepped away from writing production code, even as I’ve taken on leadership and architectural roles: As a ‌hands-on Big Data Developer‌, I’ve built robust data ingestion utilities (including the open-source DataXServer on GitHub) and real-time page click analytics systems, directly coding pipelines to pull data from RDBMS, NoSQL databases, and file storage into production environments. As a ‌Big Data Architect‌, I’ve led platform design while still contributing core code, using Hadoop, Spark, Flink, and ElasticSearch to build scalable data infrastructure—no abstract planning here; I’ve written the critical components that power these systems. As a ‌Rust Specialist‌, my 6 years of experience spans building high-performance, low-latency systems. I’ve used Rust to optimize data processing pipelines, cut latency by up to 40% in high-throughput scenarios, and deliver systems that run 24/7 with zero critical errors. As a ‌Team Leader‌, I’ve managed full-stack teams (Java, front-end, QA, operations) while still pairing with developers on complex code reviews and contributing to high-priority features, ensuring I stay connected to the day-to-day challenges of software delivery. I also bring deep experience in microservices architecture and cloud-native containerization, and my cross-language expertise lets me bridge gaps between Java-based enterprise systems and Rust-powered high-performance components. If you’re looking for a professional who combines strategic vision with the grit to deliver production-ready code—someone who can architect a system, and write the Rust or Java code that makes it run—I’m the candidate for you. Thank you for reviewing my profile. I’m eager to discuss how my hands-on experience can add value to your team.