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With 10+ years of experience in Linux, DevOps, cloud, virtualisation, and network security, I deliver reliable, high-performance solutions for modern IT environments. Core Expertise: Linux & Unix Systems: Debian based , RHEL, macOS, Solaris , OpenBSD Networking & Cisco: Routing & switching (BGP, OSPF, EIGRP, MPLS), QoS, HSRP/VRRP/GLBP; CCNA-certified; modern firewall architecture. Security: Network and cloud protection, encryption, VPNs, Zero Trust frameworks, system hardening, compliance, vulnerability management, and security automation (SIEM & SOAR), pentest. Cloud & DevOps: AWS, Kubernetes, Docker, Terraform, Ansible, Puppet, Jenkins, GitHub Actions, Gitlab pipelines Virtualization & Containers: VMware ESXi, KVM, Proxmox, Docker, LXC/LXD Monitoring & Observability: Prometheus, Grafana, Zabbix, ELK stack Web & Load Balancing: Nginx, HAProxy, Varnish, Cloud Load Balancers (AWS ALB/NLB, GCP Load Balancers) Databases: MySQL, PostgreSQL, MongoDB, Elasticsearch Version Control & Collaboration: Git, GitHub, GitLab, Bitbucket

Hi! Thank you for visiting my profile and I appreciate it and I am sure that you will not regret it. My experience and education: ⭐️ Bachelor's Degree in Computer Science ⭐️ 8+ years in Testing & QA (Agile & SCRUM) ⭐️ Over 10,000 hours of work, including 6,500+ on Upwork I have strong knowledge of the following technologies: ⭐️Manual testing of web, desktop, mobile apps and automation ⭐️Functional, regression, smoke, performance, white/grey/black box, penetration, security testing, cross-browser and cross-platform testing, etc ⭐️Creating test plans and test cases ⭐️I have a lot of real test environments (Windows PC, Android phones and tablets, iOS phones and tablets, Windows phones) Strong understanding of testing theories, methodologies, and overall QA processes, including test tracking and lifecycle management. Solid hands-on experience with front-end technologies like HTML, CSS, and JavaScript, which helps a lot in UI and bug analysis. Comfortable testing web services and REST APIs, with a good grasp of how backend and frontend interact. Confident working with databases such as MySQL and MongoDB, writing SQL queries for data validation and troubleshooting. Familiar with version control and CI/CD workflows using Bitbucket and GitLab. Practical background in manual testing of both desktop and mobile applications (iOS and Android), including functional, regression, and exploratory testing. Regularly use tools like Playwright, Selenium IDE, Postman, Newman, and other QA tools to support testing activities. Used to working in Agile environments with task and bug tracking systems like Jira, Trello, and similar platforms. So, again, if you need a really good QA engineer with the ​best price/skill ratio - you're at the right profile and I'm to your service. Thank you for your time. Best regards, Vitali

I have been developing web services, websites and applications since 2005. Now have perfect skills in PHP programming, JavaScript, Node.js, HTML+CSS, MySQL and a bit less in Java, Kotlin, Swift and other mobile applications development techs. I have experience with high-loaded web-services, portals etc, I can work with most common frameworks, as well as custom systems and engines developed in PHP. I will gladly take part on development of any website, webservice, messenger bot or parser of any complexity. I can also modify or repair your website, service or web application if you have any problem with it, or develop new individual modules, components or integrations for your service or web-site. I have extensive experience in integrating with payment systems, databases and external services through API, as well as developing API and integrations between various services.

🏆 Top Rated Plus on Upwork, top 3% globally WHAT YOU GET ▸ 9+ years of experience as Python Developer | AI Developer | Backend Developer ▸ 20+ delivered projects across AI SaaS, CRM systems, RAG platforms, legal tech, climate tech, real estate, healthcare, and marketplaces ▸ 5+ AI-powered RAG systems, LLM assistants, document processing pipelines, and OpenAI integrations built from idea validation to production launch ▸ 15+ scalable Python backends with Django, FastAPI, PostgreSQL, Docker, AWS, Stripe with clean architecture, secure APIs, production-ready delivery ACHIEVEMENTS | Client wins from Python AI & backend development ▸ 26-day ROI recovery · built a Recruiting SaaS with Python backend and automated web scraping pipelines that helped a recruitment agency launch faster ▸ 16x efficiency boost · built a custom web application for construction, cutting quoting time from 8 hours to 30 minutes ▸ #4 Product of the Day · delivered an AI Legal Assistant with RAG-powered document search, OpenAI integration, and AI agent workflows for a legal tech startup ▸ 5+ HIPAA‑compliant healthcare platforms · secure backend systems with role‑based access, API integrations, and patient‑provider workflow automation ▸ 10+ CRM & ERP systems · custom Python backends, dashboards, scalable automation, data scraping and reporting tools WHAT I CAN DO FOR YOU ▸ Custom Python backends with Django, FastAPI, or Flask · clean architecture, RESTful APIs, production readiness ▸ AI-powered RAG systems and LLM integration · LangChain, OpenAI API, vector databases, semantic search ▸ AI Legal Assistant · RAG, OpenAI, clause summarization ▸ AI Climate Policy Chatbot · semantic search, citations, hallucination checks ▸ AI‑powered visual search marketplace · image recognition, matching algorithms ▸ AI publishing platform · RAG, automated QA, versioning, observability ▸ AI document intelligence · PDF/DOCX parsing, structured extraction, LLM insights ▸ AI FinTech MVP · Python backend, API integrations, scalable SaaS ▸ Document processing pipelines · PDF parsing, OCR, data extraction, structured output ▸ Data scraping and automation · BeautifulSoup, Scrapy, Selenium, ETL pipelines, scheduled workflows ▸ SaaS platforms and MVPs · user roles, subscription billing, Stripe integration, scalable architecture ▸ Admin dashboards · role‑based access, analytics, reporting, data visualization ▸ AI agents and chatbots · intelligent assistants, conversational AI, automated decision-making ▸ Healthcare and compliance · HIPAA, SOC 2, GDPR-ready backend systems ▸ Real estate, marketplace, CRM · property tracking, user management, workflow automation ▸ PostgreSQL schema design and optimization · scalable database architecture ▸ API integrations · Stripe, OpenAI, Twilio, SendGrid, third‑party RESTful APIs ▸ Infrastructure · Docker, CI/CD, AWS (EC2, S3), Railway, Render ▸ Post‑launch support · maintenance, feature additions, technical guidance ▸ Full‑stack Python & web · React, JavaScript, HTML, CSS, Bootstrap, PHP/Laravel integrations CORE STACK ▸ Backend: Python, Django, FastAPI, Flask, PostgreSQL, Redis, Celery ▸ AI & LLM: OpenAI API, LangChain, FAISS, Pinecone, pgvector, Retrieval Augmented Generation, ▸ RAG pipelines, Vector Search, Semantic Search, Computer Vision (Clarifai) ▸ Data & Automation: BeautifulSoup, Scrapy, Selenium, pandas, ETL Pipelines, PDF/DOCX Parsing ▸ Infrastructure: Docker, AWS, CI/CD, GitHub Actions, Railway, Render ▸ Frontend: React, JavaScript, HTML, CSS, Bootstrap, Next.js As a Python and backend developer, I cover end‑to‑end delivery: architecture, APIs, databases, infrastructure, and AI logic. I work as a Python backend developer, AI developer, Full Stack Python developer, or Python web developer depending on the scope. For AI projects, I act as a Python AI developer, building RAG systems, LLM pipelines, document processing, and intelligent automation, with experience in machine learning and data science. My work also spans Deep Learning, Natural Language Processing, and AI agent development. I also work with PHP and Laravel when integration into existing systems is needed. My web scraping background supports analytics, lead generation, and market research. What sets me apart is product thinking. As a technical partner and software engineer, I define architecture, reduce complexity, and build user‑ready solutions, not just prototypes. My experience spans full stack developer, web developer, php developer, web scraping, machine learning, and data scientist roles, enabling effective cross‑functional collaboration across the entire product lifecycle. Looking for a python developer or backend developer to build or scale your backend? Reach out to me. ✉︎

Hi there! I'm Amin, a dedicated Senior Support Engineer with over 8 years of experience in SaaS platforms, WordPress, and Shopify. I specialize in solving complex technical challenges with a focus on long-term solutions and client satisfaction. What I Bring to the Table API & Integration Mastery: I have a knack for debugging REST API issues and resolving webhook delivery challenges, ensuring your systems communicate flawlessly. Comprehensive SaaS Support: My expertise in complex troubleshooting and SQL-based data validation helps maintain system integrity and prevent future issues. Shopify & WordPress Expertise: Whether it's Shopify app integration or WordPress system troubleshooting, I provide tailored solutions to enhance your online platforms. Infrastructure & System Debugging: I specialize in LEMP stack performance analysis and production issue resolution, keeping your systems running smoothly. Why Choose Me? I focus on identifying root causes to deliver sustainable solutions, enhancing system reliability and boosting your business performance. My approach is proactive and client-centered, ensuring your technical needs are met with precision and care. Experience Highlights Senior Product Support Engineer: Enhanced system reliability in a Shopify SaaS environment by diagnosing and resolving API integration failures. Customer & Technical Support Engineer: Successfully resolved over 6,000 technical support cases on the WordPress platform, ensuring high client satisfaction. Freelance WordPress Developer: Developed and optimized WordPress systems with custom PHP and WooCommerce configurations. Core Technologies Technical Support & Troubleshooting SaaS Support Operations WordPress & Shopify Ecosystems API Integrations & Webhooks DNS & Domain Configuration WooCommerce - eCommerce Plugin & Theme Troubleshooting Customer Success & Service Zendesk, Intercom, Freshdesk HTML, CSS, JavaScript, PHP Ticket Escalation & Resolution Remote Collaboration Technical Documentation CRM & Helpdesk Platforms

Cloud Platforms: AWS, GCP and Azure. Services: EKS, GKE, ECS, ALB, ELB, WAF, DNS, CI/CD, Configuration Management, Automation and Scripting, Version Control System, Infrastructure as Code, Containerisation and Orchestration, Monitoring and Logging, Infrastructure Security. Experienced in: Kubernetes, Dockers, Linux, Windows, Nginx, apache, tomcat, IIS, Git, GitHub, Gitlab CI, Jenkins, ArgoCD, ELK, Splunk, Prometheus, Grafana, Zabbix, Clear understanding of Protocols: HTTP(S), SSL/TLS, SSH, DNS, S(FTP)