✅ AWS Certified 2x ✅ DevOps ✅ cPanel/WHM ✅ AWS/GCP/AZURE ✅ Ubuntu/CentOS/Winows ✅ Cost Optimization✅Migration✅Cloud Optimization I am a Top-Rated Plus senior DevOps Engineer with over 10 years of experience in AWS, Azure, Docker, Kubernetes, Terraform, Logging and Monitoring, Git, CI/CD Pipelines, Automation, Security, and System Administration. I have a professional attitude, work with dedication and am always ready to accept challenges. I have worked on various projects with international clients and diverse teams. I aim to lead innovative projects and deliver the best cloud computing services globally. Specialities and Fields of Expertise ◈ DevOps Tools - Terraform, Kubernetes, Jenkins, Git, ELK, Elastic Cloud, Ansible, Database Pipeline in Liquibase, Cost Management, etc. ◈ Monitoring Tools: Grafana, Prometheus, ELK, Elastic Cloud, AWS OpenSearch, Zabbix, Site24x7, CloudWatch, etc. ◈ Linux System Administration - Linux OS, CentOS, Debian, RHEL, Ubuntu and Windows. ◈ Server Migrations and Cloud Migration ◈ CI/CD Tools: Azure DevOps, AWS CodePipeline, Jenkins, GitLab-CI, GitHub Actions. ◈ Website Migrations involving cPanel, Plesk, and control-panel-less servers - for WordPress, .NET, Angular, Magento, Nodejs/Vuejs, OpenCart, and PHP-based websites ◈ PHP / Apache / NGINX / PHP-FPM / LAMP ◈ Database Management - MySQL, MariaDB, MongoDB and PostgreSQL ◈ DNS Management - Domain management, Nameservers Creation, MX, CNAME, SPF, DKIM, TXT, Cloudflare ◈ Open-source application installation ◈ Hosting Setup and Management - BlueHost, CloudWays, Digital Ocean, GoDaddy, Hostgator, Linode, SiteGround, etc. ◈ Cloud Solutions - Azure, AWS, Hetzner, DigitalOcean, Linode, Vultr, Google Cloud, OVH, etc. ◈ Backup Solutions - Jetbackup, SCP/tar/rsync scripting backup solutions ◈ Hosting Control Panels - cPanel/WHM, Parallel Plesk, ISPConfig, Virtualmin, CyberPanel, DirectAdmin, CWP ◈ Software Firewalls - FirewallD, CSF, UFW, iptables ◈ VPN - PPTP, OpenVPN, Outline ◈ Script Automation ◈ SSL/TLS AWS Cloud Skills Set: • Creation of IAM Users, Groups, Roles, cross-account assume roles, Policies, and fine-grained access control • EC2, Bastion Host and Security Groups • S3 buckets, bucket policies and triggers, cross-account bucket access and static web hosting with CloudFront. • Lambda, serverless computing, lambda packages and deployment • EKS, ECS clusters, task definitions, services, ECS Fargate • CloudFormation templates, stack creation and update. • Creation of VPC, Subnets, Route tables, NACL, NAT gateways, internet gateways, VPC Endpoints and peering • RDS clusters and instance creation, schema deployment into RDS • CloudWatch metrics, events, rules and alarms | SNS notifications, topics and subscriptions | SQS queues creation and trigger policies • MySQL and MongoDB databases (Configuration, Backup, Restore, Troubleshooting) • Auto Scaling with simple and step scaling policies • Creation of Elastic, Application and Network Load Balancer and end-to-end secure communication with SSL certificates • Code Pipeline, Code Commit, Code Build, Code Deploy

I am a skilled Software Engineer and database developer with over 5 years of experience in designing, developing, and implementing databases using SQL, SSIS, SSRS, DBA, and Python Database Scripting and API development. My expertise in database development and management has enabled me to successfully create efficient and reliable databases that support complex business requirements.

🏆 Top Rated Plus | 100% Job Success 🏆 Senior Infrastructure Engineer 🏆 Linux • Networking • Monitoring • Automation • Security Operations • Windows • DevOps I help businesses design, troubleshoot, monitor, secure, and automate production infrastructure environments. With 15+ years of hands-on experience across Linux systems, cloud infrastructure, enterprise networking, monitoring platforms, observability workflows, infrastructure automation, and security operations, I focus on solving complex operational and infrastructure challenges reliably and professionally. ━━━━━━━━━━━━━━━━━━ 💻 Infrastructure & Linux Engineering ━━━━━━━━━━━━━━━━━━ ✅ Linux administration (Ubuntu, Debian, AlmaLinux, CentOS, RedHat) ✅ Infrastructure troubleshooting & operational support ✅ Server hardening & patch management ✅ Performance tuning & infrastructure optimization ✅ Docker & containerized environments ✅ VPN deployments (WireGuard, OpenVPN, IPsec) ✅ DNS troubleshooting & infrastructure migrations ✅ NGINX, Apache, LiteSpeed optimization ✅ MySQL, MariaDB, PostgreSQL administration ✅ Infrastructure monitoring & operational visibility ━━━━━━━━━━━━━━━━━━ 📊 Monitoring & Observability ━━━━━━━━━━━━━━━━━━ ✅ Zabbix deployment, templates, alerting & monitoring ✅ Graylog centralized logging & syslog ingestion ✅ Infrastructure observability workflows ✅ SNMP monitoring & telemetry collection ✅ Infrastructure dashboards & alerting strategies ✅ Log parsing, visibility & operational troubleshooting ✅ Monitoring Linux servers, switches, VPS, cloud environments & infrastructure services ━━━━━━━━━━━━━━━━━━ 🌐 Network Engineering ━━━━━━━━━━━━━━━━━━ ✅ Arista & Cisco Nexus operational support ✅ VLANs, VRFs, routing & switching ✅ WireGuard & site-to-site VPN deployments ✅ A10 Networks & CGNAT operational support ✅ Network troubleshooting & operational visibility ✅ Firewall policy troubleshooting ✅ Infrastructure telemetry & monitoring integrations ✅ Infrastructure cabling & operational deployments ━━━━━━━━━━━━━━━━━━ ☁️ Cloud & Infrastructure Operations ━━━━━━━━━━━━━━━━━━ ✅ AWS infrastructure support ✅ Cloudflare integrations & DNS management ✅ EC2, VPC, RDS, Redis & infrastructure deployments ✅ Amazon SES, SPF, DKIM & DMARC configuration ✅ Email deliverability troubleshooting ✅ Cloud migrations & infrastructure onboarding ✅ Infrastructure automation using Bash & Python ━━━━━━━━━━━━━━━━━━ 🔐 Security Operations ━━━━━━━━━━━━━━━━━━ ✅ Vulnerability remediation support ✅ Security hardening & MFA enforcement ✅ Incident response & operational troubleshooting ✅ Malware cleanup & compromised server handling ✅ Infrastructure security baselines ✅ Operational security reviews ✅ ISO27001 / SOC2 / HIPAA operational support ━━━━━━━━━━━━━━━━━━ 🛠️ Platforms & Technologies ━━━━━━━━━━━━━━━━━━ 💻 Linux: Ubuntu • Debian • AlmaLinux • CentOS • RedHat 🌐 Networking: Arista • Cisco Nexus • WireGuard • VPN • VLAN • VRF • A10 Networks 📊 Monitoring: Zabbix • Graylog • SNMP • Syslog • Telemetry ☁️ Cloud: AWS • Cloudflare • DigitalOcean • Linode • Vultr ⚙️ Automation: Bash • Python • REST APIs • Infrastructure Automation ━━━━━━━━━━━━━━━━━━ 🚀 What You Can Expect ━━━━━━━━━━━━━━━━━━ ✅ Clear communication ✅ Production-safe execution ✅ Strong troubleshooting methodology ✅ Clean documentation ✅ Long-term operational stability ✅ Infrastructure-focused solutions ✅ Reliable and professional support I am comfortable working independently, collaborating with internal teams, troubleshooting production incidents, and supporting long-term infrastructure operations across enterprise and MSP environments.

I am Sr Database Developer (MySQL/MariaDB) and Sr Full-Stack Developer. My areas of expertise are database-driven application development, database performance optimization, and data processing projects. Examples of projects I worked on: database server configuration/optimization, high-availability database solutions, performance optimization/caching projects, data extraction/mining projects, data migration/import/export projects, multi-threaded data processing projects, web page(s) loading analysis etc. I rate myself as a highly skilled professional. It does not mean I code 2-3 times faster. It means I do things right on first try.

Ladies & gentlemen, I am a full-stack developer with years of experience in IT, during this time I develop, host, and manage complex web-based software applications. I would be glad to improve the efficiency of your work processes by implementing qualified tools in your current or future system. I have extensive experience in developing internal software with various features and functions (costing, calculations, automation, conversion, etc.) with the possibility of monetization depending on your plans. For complex tasks and calculation-intense problems, I use: - PHP, Laravel, Symfony, Yii2, Zend, Node.js, Next.js - JavaScript frameworks: JQuery, Vue.js, React.js, - Databases, SQL & NoSQL: MySQL, PostgreSQL, Elastic Search, MongoDB I believe in concepts such as communication, accountability, transparency, flexibility, and most importantly, results since my slogan is - '' Do everything 100% or don't bother with it at all'' Best Regards Serhii keywords to find me: • End-to-End Software Development for Startups • Minimum Viable Product (MVP) development • Business Automation • Improvement and customization of existing projects • SAAS solutions • E-commerce • Marketplaces • Social Networks • CRM, ERP, HRM, HMS systems • GPT-3/4, ML integration • Landing Page development • AWS • Digitalocean • Google Cloud Platform • Linode • Custom • Vue.js (Vue, VueJS), Vuetify, Nuxt • React (ReactJS, React.js) • Angular (AngularJS, Angular.js) • Alpine.js • TypeScript (Type Script) • Tailwind • SCSS / LESS • PHP • Laravel • Lumen • Yii, Yii2 • Symfony • CakePHP • Node.js • Adonis.js • PostgreSQL • MySQL (MariaDB) • MongoDB • Firebase • Redis • Elasticsearch • Solr • Amazon Redshift • AWS SQS • RabbitMQ • Laravel Horizon • Apache Kafka • Sentry.io • Snyk • New Relic • Kibana • Opsgene • Node.js • Next.js • Much more

I have Expert-Vetted Talent (EVT) badge - it's Upwork's top 1% freelancers — pre-screened by Upwork Talent Managers and experts in their field. Out of ~30 million programmers worldwide, only a few thousand know Algorithms & Data Structures better than I do, which is proven by programming competitions. Please, contact me if you need that skill level (top 0.01%). I can do algorithmic/performance work in C/C++, Python, SQL, Java, MQL4, MQL5, C#, Assembly, JavaScript, Julia, Rust, and probably other languages - learning them rapidly. I also work with AI, mostly in NLP and NLU: large language models including OpenAI GPT-3, Bloom, BloomZ, GPT-J 6B, LLaMA, Alpaca, etc.; HuggingFace Transformers, Accelerate; Petals, Deepspeed, zfp/zfpy; CUDA, CPU, and MPS (AArch 64 M2 MacOS Metal GPU) backends. I have some work experience with Apple Neural Engine (ANE). In AI, I also worked with XGBoost for predictions (including trading), LibSVM, TensorFlow, PyTorch, Scikit-learn, etc. I have the hardware in my home office for training and inference with large language models and other AI. English: C1 (Grammarly plugin says I use more unique words than 95% of other users, native speakers included). Polish: B1 (86%). Russian, Belarusian: Native. - With unique skills in Algorithms & Data Structures, I improve programs asymptotically (often 100 or more times on large input data). - 29 years of programming (started Basic and assembler on ZX Spectrum), 24 years of C/C++, 16 years of commercial work experience + 3 years of research projects. - Contributed to widely used Open Source projects: LLVM/Clang (my contribution is XRay profiler on ARM32 and AArch64 systems), Katana Graph (multiple small contributions mostly driven by the proprietary part where I do GPU/CUDA), CBMC "C Bounds Model Checking" (I contributed parallelized output of DIMACS formatted Boolean Satisfiability formula), oatpp (C++ web framework, I contributed bug-fixes), OWL (OptiX Wrapper Library, I contributed build fixes for Ubuntu), Galois (research project for distributed computations on graphs, I contributed GPU improvements) - Actively participated in bug reporting and reproduction (for NVIDIA CUDA, Cadical&kissat boolean satisfiability solver, JBOSS, MariaDB, Tensorflow, Linux, etc) - Led several open-source projects of my own: ProbQA (a video game recommendation system based on a high-performance Bayesian inference engine with CUDA, SIMD, and multi-threading); InSoAr (automatic reconstruction of software architecture from source code ), a multi-threaded Boolean Satisfiability solver, etc. Working for hire, implemented: - efficient multi-threading, scaling real-world workloads almost linearly with the number of CPU cores (128x for AMD Ryzen Threadripper 3990X) - SIMD vectorization (SSE/AVX), up to 8x improvement in computing thread or even copying (see my "Faster alternatives to memcpy" answer on Stackoverflow, URL upon request). - cache-aware algorithms: up to 50x improvement on some workloads - up to 20 trillion operations/second in CUDA (thousands of times faster than CPU) - up to the theoretical limit (6.8 Gigarays/second on RTX 2080 laptop GPU) in ray-tracing with OWL and OptiX - AVX512 and RTM (Restricted Transactional Memory) based acceleration, 16x improvement for float numbers -up to 20x improvements to cryptocurrency miners on CPU using AVX512 and cache-friendly algorithms - crypto-miners for Ethereum, Bittensor, Qubic 15K reputation on Stackoverflow: (1915854/serge-rogatch) Topcoder SRM score: 1480 - among top 5K programmers in the world - top 0.02% (rSerge) I developed all kinds of networking applications, from Linux Kernel modules up to Web applications. The majority of work was, of course, done at TCP/IP level with socket calls like send/recv/select. Programming languages: C++, C++11/14/17/20, C, Python, x86/x64/ARM/AArch64 assembly, SQL, C# .NET, JavaScript, HTML, CSS, Java, MQL4, MQL5, XML, Cypher, Rust. Libraries/Frameworks: PyTorch, Tensorflow, HuggingFace Transformers/Accelerate/Safetensors, Hivemind/Petals, OpenAI, tiktoken, Django, Flask, STL, LibSVM, XGBoost, libcurl, Selenium, PyTorch, Transformers. Technologies: OpenMP, CUDA, SIMD (AVX&SSE, RTM), Linux Kernel Modules, OptiX/OWL, RTX, raytracing. Theory/Principles/Know-how/Methodologies: Algorithms & Data Structures, Performance Optimization, Artificial Intelligence, Multithreading, Vectorization, OOP, Low-latency, High-frequency, Blockchain. Open source code: Clang, LLVM, LLVM's compiler-rt library, Linux Kernel, a few of my own repositories, contributions to AI and Algorithm open-source projects such as Petals and CBMC. Tools/APIs/Architectures/Platforms: PostgreSQL, MSSQL, MySQL, Neo4j, MATLAB, CMake, GIT, MT4, MetaTrader 5, Conda, PyCharm. Virtual Machines / Containers: Docker, VMWare, VirtualBox, QEmu, Hyper-V. OSes: Windows, Linux, Android, macOS

I am a seasoned database professional with more than 15 years of specialized experience, primarily focused on MySQL and MariaDB, both replication as well as Galera Cluster and InnoDB Cluster. Those skills are complemented by proficiency in PostgreSQL, ClickHouse, Redis, and MongoDB. My expertise lies in database performance analysis and optimization, as well as the design and implementation of robust, high-availability architectures. I possess in-depth knowledge of load balancing technologies, including ProxySQL, MaxScale and HAProxy. On PostgreSQL side I've been working with pgBouncer and pgPool. I have successfully managed complex systems in both AWS and on-premises environments, ensuring exceptional reliability and efficiency.

I build production React, Next.js & Laravel SaaS platforms with AI, LLM, and automation systems engineered in from day one, not bolted on after launch. 🏆 𝐓𝐨𝐩 𝐑𝐚𝐭𝐞𝐝 𝐏𝐥𝐮𝐬 | 💯 𝟏𝟎𝟎% 𝐉𝐨𝐛 𝐒𝐮𝐜𝐜𝐞𝐬𝐬 𝐒𝐜𝐨𝐫𝐞 | 🤖 𝐂𝐞𝐫𝐭𝐢𝐟𝐢𝐞𝐝 𝐂𝐥𝐚𝐮𝐝𝐞 𝐂𝐨𝐝𝐞 𝐄𝐱𝐩𝐞𝐫𝐭 Over 10 years I've delivered React/Next.js frontends, Node.js and Laravel backends, and Python AI backends for SaaS founders, healthcare platforms, and workflow-automation startups, from fixed-price MVP builds with hard 3-week deadlines to long-term ownership of production codebases with active, paying users. ⚙️ 𝐅𝐔𝐋𝐋-𝐒𝐓𝐀𝐂𝐊 𝐄𝐗𝐏𝐄𝐑𝐓𝐈𝐒𝐄 Frontend: React, Next.js (App Router), TypeScript, JavaScript, Tailwind CSS, shadcn/ui, Sanity CMS integration, complex state-heavy interactive UIs (scheduling/calendar systems), Core Web Vitals and SEO optimization, pixel-perfect Figma-to-code. Backend & SaaS: Node.js, NestJS, Laravel, PHP, Python (FastAPI, Django, Flask), Prisma ORM, REST and GraphQL APIs, JWT/OAuth/Supabase Auth, multi-tenant SaaS architecture, Stripe subscription billing, PostgreSQL, MongoDB, MariaDB. Cloud & DevOps: AWS, Docker, Vercel, Supabase, Firebase, Redis, CI/CD pipelines, Nginx, WebSockets and real-time systems. 🤖 𝐀𝐈 & 𝐀𝐔𝐓𝐎𝐌𝐀𝐓𝐈𝐎𝐍 𝐄𝐍𝐆𝐈𝐍𝐄𝐄𝐑𝐈𝐍𝐆 🏅Certified Claude Code Expert, verified credential, not a self-claimed skill tag. I've built LLM orchestration layers with retry logic, streaming responses, and guardrail systems, input classifiers, output filters, and rate limiting, for conversational AI modules that handle real user sessions, not demo scripts. ⚡Async AI processing pipelines using BullMQ & Redis job queues, turning raw input (call transcripts, uploaded documents) into structured, validated output on a queue architecture built to survive production load. 🌐Browser automation & AI document processing: Python and Playwright engines that navigate dynamic third-party websites, paired with GPT-4o Vision to extract structured data from scanned PDFs and images for downstream automation. 💡Daily AI-native development workflow: Claude Code, Cursor, Lovable, and Windsurf, used inside real client codebases to accelerate delivery, not just referenced as buzzwords. 🧠RAG pipelines, vector search (Pinecone), n8n, Automation, LLM Integration, and LangChain-based AI agents for document-grounded chat, retrieval, and knowledge assistants. 🤖AI agents & workflow automation | LangChain/LangGraph agents, RAG pipelines, n8n automations that replace manual processes 🏗️ 𝐈𝐍𝐃𝐔𝐒𝐓𝐑𝐈𝐄𝐒 𝐈'𝐕𝐄 𝐁𝐔𝐈𝐋𝐓 𝐅𝐎𝐑 SaaS and workflow-automation platforms, Healthcare and HealthTech (patient/provider data platforms), iGaming and affiliate MarTech (GPT-driven, SEO-heavy platforms), FinTech, EdTech, and enterprise internal tools including CRM/WMS systems. 🎯 𝐖𝐇𝐘 𝐂𝐋𝐈𝐄𝐍𝐓𝐒 𝐊𝐄𝐄𝐏 𝐌𝐄 𝐎𝐍 𝐑𝐄𝐓𝐀𝐈𝐍𝐄𝐑 → I own backend, frontend, AI integration, and deployment under one contract. No handoff gaps between a frontend developer, a backend developer, and an "AI person" one accountable owner, start to finish. → I've delivered inside hard fixed-price sprints, a 3-week, 5-milestone backend-plus-AI build with zero missed deliverables, and inside open-ended, long-term maintenance contracts on live production codebases still generating revenue today. → I use Claude Code, Cursor, and Lovable inside real client codebases to move faster, without leaving behind code that can't be handed to another developer six months later. → I ask what the business outcome is before I choose the stack. The right architecture is the one that ships and holds up under real usage, not the most technically interesting option on the table. 𝐒𝐞𝐧𝐝 𝐦𝐞 𝐢𝐧𝐯𝐢𝐭𝐞, 𝐭𝐡𝐞 𝐣𝐨𝐛 𝐩𝐨𝐬𝐭 𝐨𝐫 𝐚 𝐬𝐡𝐨𝐫𝐭 𝐝𝐞𝐬𝐜𝐫𝐢𝐩𝐭𝐢𝐨𝐧, of what you're building. I'll tell you directly whether it's a fit, flag any risk in the scope before you commit, and give you a realistic timeline.

Need a smooth email migration or a powerful automation setup? With 14+ years of experience, I help businesses move to Office 365, Google Workspace and build reliable workflows using n8n and Power Automate - with zero downtime and zero stress. Why clients work with me: • Zero-disruption, end-to-end email migrations • Secure and compliant configurations that pass audits • Seamless cloud + on-prem (hybrid) integrations • Clear communication and proactive problem-solving If you need an expert who takes ownership and delivers predictable results, let’s discuss your migration or automation goals.

I help businesses and startups integrate APIs, build robust backend systems, and deliver internal tools that just work — fast and reliable. Whether it’s custom web apps, legacy system upgrades, or low-code solutions, I solve backend and database challenges so you don’t have to worry about the technical details. I specialize in PHP backend development, API integration, and building dashboards & internal tools using Retool and Xano. I also work with the Bubble visual development platform for fast MVPs and have extensive database experience including MySQL, PostgreSQL, Firebase, and Parse. Additionally, I have expertise with large-scale directory platforms, including Brilliant Directories and eDirectory, as well as complex legacy system modernization. Recent projects and impact: Completed a Retool internal tool project on Upwork with excellent client feedback, integrating multiple APIs and databases to streamline the client’s workflow. Built large-scale platforms including directories, food delivery apps, cleaning platforms, and game backends. I can start immediately and help deliver your project efficiently, securely, and at scale. Let’s connect and get your backend, APIs, or internal tools running exactly as you need!