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🟢 100+ successful projects | Top Rated Plus | 10+ years of experience 🟢 I help businesses collect reliable data, automate workflows, integrate APIs, and build AI-powered systems that reduce manual work and turn messy processes into clean, scalable, production-ready solutions. I’m Sergii, Senior Automation & AI Engineer at DataOx. For 10+ years, we’ve helped startups, small businesses, and growing teams build custom data extraction systems, workflow automation tools, API integrations, backend platforms, data pipelines, and practical AI automation solutions. What I can help you with: • Web scraping & data extraction Custom scraping systems for websites, marketplaces, directories, eCommerce platforms, real estate platforms, job boards, online portals, social networks, and other public or structured data sources. • Data processing & data pipelines Cleaning, structuring, normalizing, transforming, and preparing data for reporting, analytics, dashboards, CRMs, databases, Google Sheets, Airtable, internal tools, or AI systems. • Workflow automation & browser automation Automation systems that replace repetitive manual work, connect tools, handle business logic, run scheduled processes, and reduce operational workload over time. • API integration & backend systems REST API integrations, third-party API connections, custom API development, backend logic, database workflows, admin panels, internal platforms, and scalable business systems. • AI automation & AI-powered tools AI agents, ChatGPT / OpenAI API integration, Claude, Gemini, AI-driven workflows, document processing, natural language interfaces, AI-generated reports, classification, extraction, and decision-making support systems. • Existing system improvement Bug fixing, refactoring, stabilization, performance improvements, error handling, documentation, feature enhancements, and long-term support for existing automation, scraping, backend, or AI systems. Typical projects we build: • Web scraping and data extraction platforms • Price monitoring and competitor monitoring tools • Lead generation and contact data collection systems • Workflow automation and process automation tools • API integrations between CRMs, databases, SaaS tools, and internal systems • AI-powered assistants, AI agents, and business automation tools • Document parsing, classification, and reporting systems • Data pipelines, ETL processes, and structured datasets • Dashboards, admin panels, and backend web applications • Google Sheets, Airtable, Telegram bot, and email automation workflows Why clients work with us: • Strong experience with similar projects • Clear understanding of technical requirements and business goals • Reliable communication and structured project delivery • Clean, maintainable, and scalable architecture • Strong problem-solving approach • Ability to handle changing requirements and real-world edge cases • Production-ready solutions with error handling and clear documentation • Long-term support after the first version is delivered Tech stack and tools: Python, Java, FastAPI, Django, Spring Boot, PostgreSQL, MySQL, MongoDB, REST APIs, Selenium, Playwright, Scrapy, BeautifulSoup, Pandas, ETL pipelines, cloud services, OpenAI API, ChatGPT, Claude, Gemini, Google Sheets API, Airtable API, CRM APIs, payment APIs, and custom backend systems. I work best with clients who need more than just a quick script. If you need an experienced developer or technical partner who can understand the goal, clarify the scope, build a reliable solution, and support it over time, I can help. Send me a message with your project details, data sources, tools, API requirements, or current workflow, and I’ll help you define the best technical approach.

Web, mobile and API automation expert. Fully integrated CD and CI pipeline using Jenkins, Gitlab, Codeship and other tools. I have strong experience in creating automation tests using cucumber, jbehave, serenity BDD automation framework and using all its features, like integration with Jira, running tests in parallel on Jenkins and excellent HTML reports after finishing the tests. Expert in CD and CI setup using open source application and tools help your team to achieve high quality product with in timeline. Experience using Jenkins Codeship, aws EC2, Heroku and firebase to providing the cutting edge automation testing solution. As a load test engineer, I create the custom scripts in Jmeter and then we can run those scripts on the required infrastructure. I will help you benchmarking your application. I have working experience in creating web scrapper using phantomjs/selenium and casperjs as framework. I can save the results of web crawler in txt, xls or in DB also the out put can be in JSON format so that you have integrate it with your backend code. Following are the tools and languages I am comfortable working with: 1. Java, selenium webdriver, selenium page object model 2. Javascript, phantomjs, casperjs 3. Nodejs, ES6 4. Cucumber, Serenity BDD, Jbehave 5. Jenkins, Codeship, Cloudbees 6. Firebase, Heroku, AWS EC2, S3, codedeploy 7. Jmeter, Blazemeter. We have leading protractor testing framework ready to use. It has following features. 1. Customised gulp commands to run all tests, run single scenario, run tests based on tags, provide the application url from command line. 2. Configurable with CD/CI, Browser stack, Sauce lab, Bitbar 3. Single test result page for run on different browser and devices. 4. Notification for failed step and number of test failed

Web scraping expert. End-to-end data solutions. I develop bots, complex integrations, and automations to optimize time and resources. My passion is to streamline work processes and enhance efficiency through innovative solutions, including the use of AI libraries.

Need data others can’t access? I build scraping systems that bypass blocks and deliver clean, structured data at scale. Most developers try - I build working, stable pipelines for complex, protected targets. 🚨𝐈 𝐨𝐟𝐟𝐞𝐫 𝐚 𝐟𝐫𝐞𝐞 𝐬𝐜𝐫𝐚𝐩𝐢𝐧𝐠 𝐯𝐢𝐚𝐛𝐢𝐥𝐢𝐭𝐲 𝐜𝐡𝐞𝐜𝐤 𝐨𝐫 𝐩𝐫𝐨𝐯𝐢𝐝𝐞 𝐚 𝟑𝟎-𝐦𝐢𝐧𝐮𝐭𝐞 𝐜𝐚𝐥𝐥 𝐰𝐢𝐭𝐡 𝐚 𝐝𝐚𝐭𝐚 𝐫𝐞𝐯𝐢𝐞𝐰. If something can’t be done - I’ll tell you upfront. No wasted time. I’m a Full-Stack Developer with 5+ years of experience, specializing in web scraping, backend systems, and modern frontend development. I focus on building reliable solutions: scrapers that handle Cloudflare, captchas, and rate limits; backends that process and serve data efficiently; and frontends that are fast, clean, and user-friendly. Projects & Results: 📌 Sparetech - Semiconductor Data Platform Result: Built a large-scale database across ~100 sources My impact: Designed multi-source scraping architecture Normalized complex, inconsistent datasets Bypassed blocking systems & custom site structures Delivered a centralized, production-ready database 📌 Rightmove - Real Estate Scraping Ecosystem Result: Daily-updated large-scale property database + analytics tool My impact: Scraped one of the largest UK real estate platforms Bypassed anti-bot & rate-limiting systems Built data pipelines with daily updates Developed Chrome extension for ROI & rental yield analytics 📌 Nancy Packes Inc. - Data & Automation Systems Result: Contributed to projects generating $200K+ value My impact: Built data extraction & automation workflows Integrated APIs and structured datasets for business use Optimized performance and reliability Core Skills That Drive Results: 🔹 Frontend (Modern UI that converts) React, Next.js, Vue - fast, scalable SPAs & SSR apps State management (Redux, React Query, Context) - predictable, maintainable UI Tailwind, SCSS, Styled Components - clean, responsive design Form systems (Formik, React Hook Form, Yup) - robust validation UX 🔹 Backend (Scalable & secure systems) Python (FastAPI, Flask, Django) - high-performance APIs PostgreSQL, MongoDB - solid data architecture Auth (JWT), WebSockets - real-time & secure systems Docker - clean deployment pipelines 🔹 Web Scraping (My unfair advantage) Scrapy, Playwright, Selenium - dynamic & protected sites Anti-bot bypass (Cloudflare, rate limits, captchas) Proxy rotation, session handling ETL pipelines, data normalization High-volume scraping with retries & monitoring 🔹 Telegram Automation Aiogram, Telethon - high-load bots Payments, notifications, admin panels CRM/API integrations Focus Niches: eCommerce Real Estate Telegram Automation Crypto / Web3 Data-driven platforms SEO Keywords: Web Scraping, Data Extraction, Scrapy, Playwright, Selenium, Python Backend, FastAPI, API Development, React, Next.js, Full Stack Developer, Data Pipelines, ETL, Automation, Telegram Bots, WebSocket, Anti-bot Bypass, Proxy Rotation, Real Estate Data, eCommerce Scraping, Chrome Extension

🏆 Top Rated Plus · $400K+ earned · 99% Job Success I design, build, and ship the web scrapers, data pipelines, AI/LLM integrations, and full SaaS products that other developers call "impossible" — and I stay on it until it actually works inside your systems, not just in a demo. Most freelancers hand you a script and disappear. I scope the real problem, build the full solution, and own the result until it's running in production and you can maintain it yourself. ⚙️ What I build for clients: - End-to-end products & SaaS — full builds, architected and shipped: backend, REST API, database design, auth, dashboards, deployment — complete systems you can run and grow, not one-off scripts - Web scraping & data extraction at scale — listings, real estate / timeshare data, leads, pricing — including anti-bot, JS-heavy, and login-gated sites - Data pipelines & enrichment — clean, deduplicated, verified data delivered where you need it (database, sheet, or API) - AI & LLM integration — OpenAI / GPT-powered extraction, document parsing (PDF → structured data), classification, and AI agents wired into real workflows - Third-party API integration — connecting platforms, syncing data, and automating the manual steps between them 🧩 Recent work: - Real-estate / timeshare data platform integrated with the Guesty API - Scrapers for energy-market and financial portals (anti-bot, structured output) - PDF → Markdown / structured-data extraction pipeline - Verified business-contact datasets for the hospitality sector - Subscription prediction service — Python, statistical modeling, automated data flow 🤝 How I work: direct communication (I reply within hours), clear scope before I start, and code you own and understand — no black boxes, no lock-in. 🔧 Stack: Python (Playwright, Scrapy, BeautifulSoup, Pandas, Flask / Django), OpenAI API, REST APIs, PostgreSQL / MySQL / MongoDB, Docker, AWS. 💬 Message me with what you're trying to achieve — I'll tell you straight whether I can help and how I'd approach it.

I have more than 15 years of programming experience. As a freelancer, I have broad experience: I developed web (ASP.NET, Python, PHP), desktop (C++, C#, Python — Linux and Windows) and mobile (Android — Java, C++) applications. I list here some of my jobs. C#: * clubspeed.com — a large software suite for family entertainment clubs; included C# code (80%), including CoreApi and ASP.NET Razor, plus PHP (Laravel) and Node.js code (for low-level car racing control tasks). I developed it as a team member. * qadra.com — a financial company; C# code (80%), Python (some microservices are Python/Flask based, 20% of code), AWS-hosted with Docker containers and Lambdas. I developed it as a team member. * enven.nl — implemented from scratch their non-public partners portal: ASP.NET Razor and some CoreApi endpoints. * ASP.NET website for house rentals. * ASP.NET website for remote control of a robotic device via a WebSocket connection. * Vegetable-oil plant automation desktop program (C# + WinCC). Python: * Embeddable fact-checking chat that uses the LangGraph framework to implement a customizable LLM/AI backend (OpenAI, DeepSeek, Hugging Face, or Ollama). It allows administrators to embed the component in their websites so users can ask questions about facts described in articles and verify whether facts listed in an article are true. It included agentic code and many external APIs to check facts (not just asking an LLM), and even computer vision to inspect website photos (OpenCV). Backend is FastAPI. * AI/LLM-based ad selection for a website (FastAPI and LangGraph). It processes website text or chat messages and selects ads of different types related to the content. It contains SDKs for embedding ads on many platforms, including Go, React, and plain HTML. * Polish-language training software, based on Django and LangGraph. * Many small projects: desktop scripts, web scraping (Selenium and related tools), and simple AI agents. C++: * Factory equipment monitoring system (Ubuntu Linux, custom server over TCP/IP, web interface in PHP). * Many small projects, some of which are mentioned in reviews on this profile; many are non-public. * Powerful software for automated ad submission on social networks (massive bots that send millions of messages). PHP: * 20+ websites — without CMS, with my own CMS, and with open-source Drupal, WordPress and Joomla CMSs. * Backends for Android applications. Android: * SOCKS5 proxy application that allows sharing mobile VPN with non-mobile clients via the SOCKS protocol. * Many WebView-based "business card" applications. * Dating-related applications, including erotic puzzles. Human emulation: * Spam bots — I cannot provide a specific list of such software for legal reasons. * Automatic checkout on eBay and similar websites. * PayPal automatic payments. * Data scraping, including air tickets and goods in online stores. Reverse engineering — I cannot provide a specific list of reverse-engineered software for legal reasons. * Java bytecode reverse engineering, including Android. * .NET bytecode reverse engineering. * Machine code for 32-bit and 64-bit x86 and ARM CPUs. Assembler: * High-performance cryptographic library for x86\_64 CPUs.