Senior Full Stack Engineer 13+ years of contract and freelance work Design, development, and maintenance: •websites and web applications, including e-commerce platforms, based on popular CMS platforms and fully custom solutions using modern technologies and frameworks. •systems for data collection, processing, storage, and visualization. •web application automation tools, including bots and other solutions based on Selenium. •private and public APIs, as well as integrations with external APIs, payment systems, online aggregators, legacy systems, and hardware such as mobile cashier terminals, PoS stations, and PDT devices. Experience: •setup, administration, and maintenance of Linux-based and FreeBSD servers. •containerization and deployment for local development and production environments. •legacy codebase migrations (e.g., Python2→Python3, jQuery→Vue2→Vue3, Django 1.3→1.4→1.8→1.11). •implementation of observability practices, including logging, monitoring, and alerting for applications and infrastructure. •managing small cross-functional teams, including task planning, technical feasibility assessments, code reviews, and technical decision-making. Skills Programming Languages: • Python, PHP, JavaScript, SQL, Ruby, C# Frameworks and Libraries: • Django, Vue.js, Laravel, Nuxt.js, Tailwind CSS, Bootstrap, Ruby on Rails Databases: • MySQL, PostgreSQL, Redis, MemcachedOS, Observability, DevOps and Tools: • Ubuntu, Debian, CentOS, FreeBSD, Nginx, Apache, Docker, Supervisor, PM2, Posthog, Graylog, TeamCity, Celery, uWSGI, Webpack, Vite, pyenv, virtualenv, Mono JIT Compiler, Selenium AI Tools & Workflows: • OpenAI models (ChatGPT-4.5, GPT-4.1, GPT-3.5), Anthropic Claude (Opus-4, Sonnet-4.5), xAI Grok, GitHub Copilot (Codex/AI code assistant); Windsurf, Junie, and Cline AI agents and runtimes; structured workflows including ADR/spec-driven design and Plan–Act–Validate methodology for AI-assisted software development. CMS: • Joomla, Magento, PrestaShop, OpenCart, Django CMS, Django-Oscar, WordPress Collaboration Tools: • Git, GitHub, Bitbucket, Space, YouTrack, Redmine, Jira, Slack, Basecamp, Figma Languages: • English (C2), Russian (native), Portuguese (B2)…Senior Full Stack Engineer 13+ years of contract and freelance work Design, development, and maintenance: •websites and web applications, including e-commerce platforms, based on popular CMS platforms and fully custom solutions using modern technologies and frameworks. •systems for data collection, processing, storage, and visualization. •web application automation tools, including bots and other solutions based on Selenium. •private and public APIs, as well as integrations with external APIs, payment systems, online aggregators, legacy systems, and hardware such as mobile cashier terminals, PoS stations, and PDT devices. Experience: •setup, administration, and maintenance of Linux-based and FreeBSD servers. •containerization and deployment for local development and production environments. •legacy codebase migrations (e.g., Python2→Python3, jQuery→Vue2→Vue3, Django 1.3→1.4→1.8→1.11). •implementation of observability practices, including logging, monitoring, and alerting for applications and infrastructure. •managing small cross-functional teams, including task planning, technical feasibility assessments, code reviews, and technical decision-making. Skills Programming Languages: • Python, PHP, JavaScript, SQL, Ruby, C# Frameworks and Libraries: • Django, Vue.js, Laravel, Nuxt.js, Tailwind CSS, Bootstrap, Ruby on Rails Databases: • MySQL, PostgreSQL, Redis, MemcachedOS, Observability, DevOps and Tools: • Ubuntu, Debian, CentOS, FreeBSD, Nginx, Apache, Docker, Supervisor, PM2, Posthog, Graylog, TeamCity, Celery, uWSGI, Webpack, Vite, pyenv, virtualenv, Mono JIT Compiler, Selenium AI Tools & Workflows: • OpenAI models (ChatGPT-4.5, GPT-4.1, GPT-3.5), Anthropic Claude (Opus-4, Sonnet-4.5), xAI Grok, GitHub Copilot (Codex/AI code assistant); Windsurf, Junie, and Cline AI agents and runtimes; structured workflows including ADR/spec-driven design and Plan–Act–Validate methodology for AI-assisted software development. CMS: • Joomla, Magento, PrestaShop, OpenCart, Django CMS, Django-Oscar, WordPress Collaboration Tools: • Git, GitHub, Bitbucket, Space, YouTrack, Redmine, Jira, Slack, Basecamp, Figma Languages: • English (C2), Russian (native), Portuguese (B2)WWWW…