Vadym

SOFTWARE ENGINEER
Python Developer | QA Automation
Ukraine | [відкрити контакти](див. вище в блоці «контактна інформація») | Telegram: @vadymn9

SUMMARY

Versatile Software Engineer with a strong foundation in Python and infrastructure automation. While my core
expertise lies in developing complex data acquisition systems and headless browser frameworks (Playwright,
Selenium), I am highly adaptable and open to diverse technical roles. Whether it involves Backend Development,
QA Automation, Data Engineering, or IT Infrastructure Operations, I bring a problem-solving mindset and a quick
learning curve for new technologies.

CORE COMPETENCIES

Software Dev & Testing Python (Asyncio, PyTest), QA Automation, REST API Integration, Scripting.

Web Automation Playwright, Puppeteer, Selenium, Stealth technologies, Browser context
management.

Infrastructure & DevOps Linux (Ubuntu/Debian), Docker, Proxy routing logic, High-load server
environments.

Network & Security TLS/SSL Fingerprinting, HTTP/2 & QUIC, traffic routing, anti-detection
mechanisms.

FinTech / DeFi Smart contract interaction, DEX liquidity analysis, P2P arbitrage logic.

PROFESSIONAL EXPERIENCE

Lead Automation Engineer | Stealth Systems Development March 2024 — Present

• Developed a scalable headless browser testing framework on Linux nodes, optimizing bandwidth and proxy
utilization for high-concurrency tasks.
• Architected custom Playwright-based engines with deep-level network layer manipulation (sec-ch-ua, Accept-
Language headers synchronization).
• Built robust automation scripts to simulate complex user behaviors and interact with dynamically loaded web
elements.
• Engineered advanced anti-detection mechanisms including biometric behavior simulation (Gaussian jitter,
adaptive typing rhythms).

DeFi / Algo-Trading Developer February 2026 — April 2026

• Built automated Python modules for liquidity monitoring and P2P arbitrage across decentralized exchanges
(DEX).
• Optimized smart contract interactions to ensure low-latency execution and reliable transaction handling.
LANGUAGES & ATTRIBUTES

Ukrainian: Native
English: Pre-Intermediate (Technical reading & documentation)
Polish: Elementary (Basic communication)

Highly adaptable: ready to pivot into new tech stacks (Backend, QA, DevOps) and take on varied IT responsibilities to
support business goals and team success.