Kacper Kostrzab
Warsaw, Poland
Kacper Kostrzab
Advanced Web Automation & Scraping Expert
Category : E-commerce website creation
I specialize in the "impossible" side of web automation. If your current scraping scripts or tools are hitting walls like Cloudflare, Turnstile, or sophisticated anti-bot systems, I’m the developer you hire to break through them.
I don’t use generic, detectable SaaS tools. I build custom, high-performance solutions from scratch in VS Code using Playwright (TypeScript/Node.js), specifically designed to mimic human behavior and remain invisible to security layers.
What I can deliver for you:
High-Difficulty Scraping: Extracting clean data from sites like LinkedIn, Amazon, and Real Estate portals where standard scrapers fail.
Custom Automation Bots: Reliable scripts for automated booking, account management, and complex multi-step workflows.
AI Agent Integration: Building custom MCP servers and browser-automation tools that allow AI models (Claude/GPT) to interact with the web seamlessly.
E2E Testing: Professional end-to-end testing suites to ensure your web application is 100% bug-free before deployment.
Why me?
Bypass Specialists: Expertise in Stealth plugins and fingerprint rotation.
Clean Code: Production-ready, maintainable scripts delivered fast.
Results-Oriented: I don't just write code; I solve the bottleneck that is stopping your business.
Ready to get your data or automate that boring task? Send me a message with your target site, and let’s get it done today.
I don’t use generic, detectable SaaS tools. I build custom, high-performance solutions from scratch in VS Code using Playwright (TypeScript/Node.js), specifically designed to mimic human behavior and remain invisible to security layers.
What I can deliver for you:
High-Difficulty Scraping: Extracting clean data from sites like LinkedIn, Amazon, and Real Estate portals where standard scrapers fail.
Custom Automation Bots: Reliable scripts for automated booking, account management, and complex multi-step workflows.
AI Agent Integration: Building custom MCP servers and browser-automation tools that allow AI models (Claude/GPT) to interact with the web seamlessly.
E2E Testing: Professional end-to-end testing suites to ensure your web application is 100% bug-free before deployment.
Why me?
Bypass Specialists: Expertise in Stealth plugins and fingerprint rotation.
Clean Code: Production-ready, maintainable scripts delivered fast.
Results-Oriented: I don't just write code; I solve the bottleneck that is stopping your business.
Ready to get your data or automate that boring task? Send me a message with your target site, and let’s get it done today.
Working hours
- Monday:08h00 To 18h00
- Tuesday:08h00 To 18h00
- Wednesday:08h00 To 18h00
- Thursday:08h00 To 18h00
- Friday:08h00 To 18h00
- Saturday:Not available
- Sunday:Not available
QA Automation & Manual Tester at Tutore
Automation Leadership: Architected and scaled a robust E2E testing framework using Playwright and TypeScript, covering critical user paths (lesson booking, student/teacher dashboards, and payment integrations).
Manual Precision: Conducted extensive manual regression, functional, and exploratory testing across multiple environments, ensuring 100% stability for real-time video-learning modules.
Performance & Efficiency: Integrated automated scripts into the CI/CD pipeline, reducing manual testing overhead by over 65% and accelerating the release cycle of new platform features.
Custom Tooling: Developed bespoke automation tools and scrapers in VS Code to monitor data integrity and platform availability under high traffic loads.
Bug Lifecycle Management: Streamlined the bug reporting process using Jira, providing developers with high-quality technical documentation and reproduction steps to minimize fix-time.
UX-Driven Quality: Worked closely with product teams to refine UI/UX elements, ensuring the platform remained intuitive and accessible for both children and adult learners.
Automation Leadership: Architected and scaled a robust E2E testing framework using Playwright and TypeScript, covering critical user paths (lesson booking, student/teacher dashboards, and payment integrations).
Manual Precision: Conducted extensive manual regression, functional, and exploratory testing across multiple environments, ensuring 100% stability for real-time video-learning modules.
Performance & Efficiency: Integrated automated scripts into the CI/CD pipeline, reducing manual testing overhead by over 65% and accelerating the release cycle of new platform features.
Custom Tooling: Developed bespoke automation tools and scrapers in VS Code to monitor data integrity and platform availability under high traffic loads.
Bug Lifecycle Management: Streamlined the bug reporting process using Jira, providing developers with high-quality technical documentation and reproduction steps to minimize fix-time.
UX-Driven Quality: Worked closely with product teams to refine UI/UX elements, ensuring the platform remained intuitive and accessible for both children and adult learners.
Manual QA Tester at Tuatara
End-to-End Functional Testing: Conducted comprehensive manual testing for large-scale digital transformation projects in the telecom and financial sectors, ensuring all business requirements were met.
API Testing & Integrations: Performed rigorous API testing using Postman and Swagger, verifying seamless data exchange between complex microservices and external systems.
Defect Management: Managed the full bug lifecycle in Jira, providing developers with precise reproduction steps, logs, and technical context to expedite fixes.
Test Documentation: Authored and executed detailed test cases and test plans in Confluence/TestRail, maintaining high standards of quality assurance documentation.
Collaboration & UAT: Actively participated in Grooming and Sprint Planning sessions, working closely with Business Analysts and Developers to clarify requirements and support User Acceptance Testing (UAT).
Regression & Sanity Checks: Executed critical regression suites before major releases, ensuring that new features did not impact existing system stability in high-traffic production environments.
End-to-End Functional Testing: Conducted comprehensive manual testing for large-scale digital transformation projects in the telecom and financial sectors, ensuring all business requirements were met.
API Testing & Integrations: Performed rigorous API testing using Postman and Swagger, verifying seamless data exchange between complex microservices and external systems.
Defect Management: Managed the full bug lifecycle in Jira, providing developers with precise reproduction steps, logs, and technical context to expedite fixes.
Test Documentation: Authored and executed detailed test cases and test plans in Confluence/TestRail, maintaining high standards of quality assurance documentation.
Collaboration & UAT: Actively participated in Grooming and Sprint Planning sessions, working closely with Business Analysts and Developers to clarify requirements and support User Acceptance Testing (UAT).
Regression & Sanity Checks: Executed critical regression suites before major releases, ensuring that new features did not impact existing system stability in high-traffic production environments.
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