Ростислав

Koval Rostyslav
Data Extraction Engineer | Web Scraping Engineer
GitHub: https://github.com/Rostuslavchuk

Education
2022-2026 Lviv Polytechnic National University
Institute: ICTA (Institute of Computer Technologies, Automation, and
Metrology)
Department: IS (Information Security)
Specialization: Cybersecurity (Bachelor’s Degree)

Skills
Core Languages Python, JavaScript/TypeScript
Web Scraping & asyncio, curl_cffi, aiohttp, regex, lxml, xpath, playwright, scrapy, bright
HTTP data web unlocker API, pandas, airflow
Data Validation &
pydantic, pytest
Testing
Data Formats &
CSV, JSON, Parquet, Excel, SQL databases
Storage
DevOps &
docker, git
Infrastructure
ETL Pipelines, Batch Processing, Data Validation, Schema Validation, API
Data Extraction &
Integration, Reverse Engineering, Proxy Management, Anti-bot
Processing
Detection & Mitigation

Languages
Ukrainian Native
English B1

Experience
Middle Data Extraction Developed and maintained 100+ web scrapers using
Engineer Bright Data infrastructure.

GlobalLogic Extracted, parsed, and structured data from websites
Jun 2025 – Oct 2026 with different layouts and dynamic content.

Used XPath and DOM parsing techniques to locate and
extract target data accurately.

Validated extracted data to ensure completeness,
consistency, and compliance with target schemas.

Investigated extraction issues, debugged scraper
behavior, and maintained existing collectors.

Data Extraction Engineer Led a team of 15 engineers, coordinating technical
/ Tech Lead discussions, reviewing code, and supporting
implementation decisions.
Olive Systems
Apr 2026 - Aug 2026 Developed and maintained web scrapers and data
collectors for complex websites.

Implemented automated data validation checks to
identify missing, inconsistent, or incorrectly extracted
values.

Monitored extraction quality, investigated failures, and
improved scraper reliability.

Coordinated technical work and supported the team in
resolving data extraction issues.